The following issues were found

src/test/java/com/alibaba/json/bvt/bug/Bug_for_sanxiao.java
15 issues
System.out.println is used
Design

Line: 22 

                      is.close();

        JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);
        Assert.assertEquals(obj.getJSONArray("segments").getJSONObject(0),
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).get("segment"));
        Assert.assertEquals(1428,
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).getJSONObject("segment").getIntValue("agentId"));
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 15 

              
public class Bug_for_sanxiao extends TestCase {

    public void test_0() throws Exception {

        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("json/Bug_for_sanxiao.json");
        String text = IOUtils.toString(is);
        is.close();

Reported by PMD.

Ensure that resources like this InputStream object are closed after use
Error

Line: 17 

              
    public void test_0() throws Exception {

        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("json/Bug_for_sanxiao.json");
        String text = IOUtils.toString(is);
        is.close();

        JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 17 

              
    public void test_0() throws Exception {

        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("json/Bug_for_sanxiao.json");
        String text = IOUtils.toString(is);
        is.close();

        JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 17 

              
    public void test_0() throws Exception {

        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("json/Bug_for_sanxiao.json");
        String text = IOUtils.toString(is);
        is.close();

        JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 19 

              
        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("json/Bug_for_sanxiao.json");
        String text = IOUtils.toString(is);
        is.close();

        JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);
        Assert.assertEquals(obj.getJSONArray("segments").getJSONObject(0),
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).get("segment"));

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 23 

              
        JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);
        Assert.assertEquals(obj.getJSONArray("segments").getJSONObject(0),
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).get("segment"));
        Assert.assertEquals(1428,
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).getJSONObject("segment").getIntValue("agentId"));
    }

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 23 

              
        JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);
        Assert.assertEquals(obj.getJSONArray("segments").getJSONObject(0),
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).get("segment"));
        Assert.assertEquals(1428,
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).getJSONObject("segment").getIntValue("agentId"));
    }

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 24 

                      JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);
        Assert.assertEquals(obj.getJSONArray("segments").getJSONObject(0),
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).get("segment"));
        Assert.assertEquals(1428,
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).getJSONObject("segment").getIntValue("agentId"));
    }

}

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 24 

                      JSONObject obj = JSON.parseObject(text);
        System.out.println(obj);
        Assert.assertEquals(obj.getJSONArray("segments").getJSONObject(0),
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).get("segment"));
        Assert.assertEquals(1428,
                            obj.getJSONArray("passengerSegmentItems").getJSONObject(0).getJSONObject("segment").getIntValue("agentId"));
    }

}

Reported by PMD.

src/test/java/com/alibaba/json/bvt/bug/Issue_for_huangfeng.java
15 issues
JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 10 

               * Created by wenshao on 16/02/2017.
 */
public class Issue_for_huangfeng extends TestCase {
    public void test_for_huangfeng() throws Exception {
        String json = "{\"success\":\"Y\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

Reported by PMD.

JUnit assertions should include a message
Design

Line: 14 

                      String json = "{\"success\":\"Y\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_t() throws Exception {
        String json = "{\"success\":\"T\"}";

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 14 

                      String json = "{\"success\":\"Y\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_t() throws Exception {
        String json = "{\"success\":\"T\"}";

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 17 

                      assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_t() throws Exception {
        String json = "{\"success\":\"T\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 21 

                      String json = "{\"success\":\"T\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_is_t() throws Exception {
        String json = "{\"isSuccess\":\"T\"}";

Reported by PMD.

JUnit assertions should include a message
Design

Line: 21 

                      String json = "{\"success\":\"T\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_is_t() throws Exception {
        String json = "{\"isSuccess\":\"T\"}";

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 24 

                      assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_is_t() throws Exception {
        String json = "{\"isSuccess\":\"T\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 28 

                      String json = "{\"isSuccess\":\"T\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_false() throws Exception {
        String json = "{\"success\":\"N\"}";

Reported by PMD.

JUnit assertions should include a message
Design

Line: 28 

                      String json = "{\"isSuccess\":\"T\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_false() throws Exception {
        String json = "{\"success\":\"N\"}";

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 31 

                      assertTrue(model.isSuccess());
    }

    public void test_for_huangfeng_false() throws Exception {
        String json = "{\"success\":\"N\"}";

        Model model = JSON.parseObject(json, Model.class);
        assertFalse(model.isSuccess());
    }

Reported by PMD.

src/test/java/com/alibaba/json/bvt/parser/JSONScannerTest__nextToken.java
15 issues
This class has too many methods, consider refactoring it.
Design

Line: 9 

              import com.alibaba.fastjson.parser.JSONScanner;
import com.alibaba.fastjson.parser.JSONToken;

public class JSONScannerTest__nextToken extends TestCase {
    public void test_next() throws Exception {
        String text = "\"aaa\"";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.LITERAL_INT);
        Assert.assertEquals(JSONToken.LITERAL_STRING, lexer.token());

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 10 

              import com.alibaba.fastjson.parser.JSONToken;

public class JSONScannerTest__nextToken extends TestCase {
    public void test_next() throws Exception {
        String text = "\"aaa\"";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.LITERAL_INT);
        Assert.assertEquals(JSONToken.LITERAL_STRING, lexer.token());
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 17 

                      Assert.assertEquals(JSONToken.LITERAL_STRING, lexer.token());
    }
    
    public void test_next_1() throws Exception {
        String text = "[";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.LITERAL_INT);
        Assert.assertEquals(JSONToken.LBRACKET, lexer.token());
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 24 

                      Assert.assertEquals(JSONToken.LBRACKET, lexer.token());
    }
    
    public void test_next_2() throws Exception {
        String text = "{";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.LITERAL_INT);
        Assert.assertEquals(JSONToken.LBRACE, lexer.token());
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 31 

                      Assert.assertEquals(JSONToken.LBRACE, lexer.token());
    }
    
    public void test_next_3() throws Exception {
        String text = "{";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.LBRACKET);
        Assert.assertEquals(JSONToken.LBRACE, lexer.token());
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 38 

                      Assert.assertEquals(JSONToken.LBRACE, lexer.token());
    }
    
    public void test_next_4() throws Exception {
        String text = "";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.LBRACKET);
        Assert.assertEquals(JSONToken.EOF, lexer.token());
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 45 

                      Assert.assertEquals(JSONToken.EOF, lexer.token());
    }
    
    public void test_next_5() throws Exception {
        String text = " \n\r\t\f\b 1";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.LBRACKET);
        Assert.assertEquals(JSONToken.LITERAL_INT, lexer.token());
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 52 

                      Assert.assertEquals(JSONToken.LITERAL_INT, lexer.token());
    }
    
    public void test_next_6() throws Exception {
        String text = "";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.EOF);
        Assert.assertEquals(JSONToken.EOF, lexer.token());
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 59 

                      Assert.assertEquals(JSONToken.EOF, lexer.token());
    }
    
    public void test_next_7() throws Exception {
        String text = "{";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextToken(JSONToken.EOF);
        Assert.assertEquals(JSONToken.LBRACE, lexer.token());
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 66 

                      Assert.assertEquals(JSONToken.LBRACE, lexer.token());
    }
    
    public void test_next_8() throws Exception {
        String text = "\n\r\t\f\b :{";
        JSONScanner lexer = new JSONScanner(text);
        lexer.nextTokenWithColon(JSONToken.LBRACE);
        Assert.assertEquals(JSONToken.LBRACE, lexer.token());
    }

Reported by PMD.

src/test/java/com/alibaba/json/bvt/writeAsArray/WriteAsArray_string.java
15 issues
JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 14 

              
public class WriteAsArray_string extends TestCase {

    public void test_0() throws Exception {
        Model model = new Model();

        String text = JSON.toJSONString(model, SerializerFeature.BeanToArray);
        Assert.assertEquals("[null]", text);

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 24 

                      Assert.assertNull(model2.name);
    }

    public void test_1() throws Exception {
        Model model = new Model();
        model.name = "abc";
        String text = JSON.toJSONString(model, SerializerFeature.BeanToArray);
        Assert.assertEquals("[\"abc\"]", text);

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 34 

                      Assert.assertEquals(model.name, model2.name);
    }
    
    public void test_error_0() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[n", Model.class, Feature.SupportArrayToBean);
        } catch (JSONException ex) {
            error = ex;

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 44 

                      Assert.assertNotNull(error);
    }

    public void test_error_1() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[nu", Model.class, Feature.SupportArrayToBean);
        } catch (JSONException ex) {
            error = ex;

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 54 

                      Assert.assertNotNull(error);
    }

    public void test_error_2() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[nul", Model.class, Feature.SupportArrayToBean);
        } catch (JSONException ex) {
            error = ex;

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 64 

                      Assert.assertNotNull(error);
    }

    public void test_error_3() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[null", Model.class, Feature.SupportArrayToBean);
        } catch (JSONException ex) {
            error = ex;

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 74 

                      Assert.assertNotNull(error);
    }

    public void test_error_4() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[\"ab", Model.class, Feature.SupportArrayToBean);
        } catch (JSONException ex) {
            error = ex;

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 84 

                      Assert.assertNotNull(error);
    }

    public void test_error_5() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[\"ab\"", Model.class, Feature.SupportArrayToBean);
        } catch (JSONException ex) {
            error = ex;

Reported by PMD.

Found non-transient, non-static member. Please mark as transient or provide accessors.
Error

Line: 96 

              
    public static class Model {

        public String name;

    }
}

Reported by PMD.

Found 'DD'-anomaly for variable 'error' (lines '35'-'39').
Error

Line: 35 

                  }
    
    public void test_error_0() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[n", Model.class, Feature.SupportArrayToBean);
        } catch (JSONException ex) {
            error = ex;
        }

Reported by PMD.

src/test/java/com/alibaba/json/bvt/parser/deser/AbstractSerializeTest.java
15 issues
JUnit 4 tests that set up tests should use the @Before annotation, JUnit5 tests should use @BeforeEach or @BeforeAll
Design

Line: 12 

              import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;

public class AbstractSerializeTest extends TestCase {
    protected void setUp() throws Exception {
        ParserConfig.global.addAccept("com.alibaba.json.bvt.bug.AbstractSerializeTest");

        ObjectDeserializer serializerB = ParserConfig.getGlobalInstance().getDeserializer(B.class);
        ParserConfig.getGlobalInstance().putDeserializer(A.class, serializerB);
    }

Reported by PMD.

Potential violation of Law of Demeter (static property access)
Design

Line: 13 

              
public class AbstractSerializeTest extends TestCase {
    protected void setUp() throws Exception {
        ParserConfig.global.addAccept("com.alibaba.json.bvt.bug.AbstractSerializeTest");

        ObjectDeserializer serializerB = ParserConfig.getGlobalInstance().getDeserializer(B.class);
        ParserConfig.getGlobalInstance().putDeserializer(A.class, serializerB);
    }

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 15 

                  protected void setUp() throws Exception {
        ParserConfig.global.addAccept("com.alibaba.json.bvt.bug.AbstractSerializeTest");

        ObjectDeserializer serializerB = ParserConfig.getGlobalInstance().getDeserializer(B.class);
        ParserConfig.getGlobalInstance().putDeserializer(A.class, serializerB);
    }

    protected void tearDown() throws Exception {
        ParserConfig.getGlobalInstance().putDeserializer(A.class, null);

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 16 

                      ParserConfig.global.addAccept("com.alibaba.json.bvt.bug.AbstractSerializeTest");

        ObjectDeserializer serializerB = ParserConfig.getGlobalInstance().getDeserializer(B.class);
        ParserConfig.getGlobalInstance().putDeserializer(A.class, serializerB);
    }

    protected void tearDown() throws Exception {
        ParserConfig.getGlobalInstance().putDeserializer(A.class, null);
    }

Reported by PMD.

JUnit 4 tests that clean up tests should use the @After annotation, JUnit5 tests should use @AfterEach or @AfterAll
Design

Line: 19 

                      ParserConfig.getGlobalInstance().putDeserializer(A.class, serializerB);
    }

    protected void tearDown() throws Exception {
        ParserConfig.getGlobalInstance().putDeserializer(A.class, null);
    }

    public void test_mapping_0() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.deser.AbstractSerializeTest$A\"}";

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 20 

                  }

    protected void tearDown() throws Exception {
        ParserConfig.getGlobalInstance().putDeserializer(A.class, null);
    }

    public void test_mapping_0() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.deser.AbstractSerializeTest$A\"}";

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 23 

                      ParserConfig.getGlobalInstance().putDeserializer(A.class, null);
    }

    public void test_mapping_0() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.deser.AbstractSerializeTest$A\"}";

        B b = (B) JSON.parse(text);
        Assert.assertNotNull(b);
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 30 

                      Assert.assertNotNull(b);
    }

    public void test_mapping_1() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.deser.AbstractSerializeTest$A\",\"id\":123}";

        B b = (B) JSON.parse(text);
        Assert.assertNotNull(b);
        Assert.assertEquals(123, b.getId());

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 35 

              
        B b = (B) JSON.parse(text);
        Assert.assertNotNull(b);
        Assert.assertEquals(123, b.getId());
    }

    public void test_mapping_2() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.deser.AbstractSerializeTest$A\",\"id\":234,\"name\":\"abc\"}";

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 38 

                      Assert.assertEquals(123, b.getId());
    }

    public void test_mapping_2() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.deser.AbstractSerializeTest$A\",\"id\":234,\"name\":\"abc\"}";

        B b = (B) JSON.parse(text);
        Assert.assertNotNull(b);
        Assert.assertEquals(234, b.getId());

Reported by PMD.

src/test/java/com/alibaba/json/bvt/issue_1200/Issue1226.java
15 issues
JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 12 

               * Created by wenshao on 16/05/2017.
 */
public class Issue1226 extends TestCase {
    public void test_for_issue() throws Exception {
        String json = "{\"c\":\"c\"}";
        TestBean tb1 = JSON.parseObject(json, TestBean.class);
        assertEquals('c', tb1.getC());

        TestBean2 tb2 = JSON.parseObject(json, TestBean2.class);

Reported by PMD.

Unit tests should not contain more than 1 assert(s).
Design

Line: 12 

               * Created by wenshao on 16/05/2017.
 */
public class Issue1226 extends TestCase {
    public void test_for_issue() throws Exception {
        String json = "{\"c\":\"c\"}";
        TestBean tb1 = JSON.parseObject(json, TestBean.class);
        assertEquals('c', tb1.getC());

        TestBean2 tb2 = JSON.parseObject(json, TestBean2.class);

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 15 

                  public void test_for_issue() throws Exception {
        String json = "{\"c\":\"c\"}";
        TestBean tb1 = JSON.parseObject(json, TestBean.class);
        assertEquals('c', tb1.getC());

        TestBean2 tb2 = JSON.parseObject(json, TestBean2.class);
        assertEquals('c', tb2.getC().charValue());

        String json2 = JSON.toJSONString(tb2);

Reported by PMD.

JUnit assertions should include a message
Design

Line: 15 

                  public void test_for_issue() throws Exception {
        String json = "{\"c\":\"c\"}";
        TestBean tb1 = JSON.parseObject(json, TestBean.class);
        assertEquals('c', tb1.getC());

        TestBean2 tb2 = JSON.parseObject(json, TestBean2.class);
        assertEquals('c', tb2.getC().charValue());

        String json2 = JSON.toJSONString(tb2);

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 18 

                      assertEquals('c', tb1.getC());

        TestBean2 tb2 = JSON.parseObject(json, TestBean2.class);
        assertEquals('c', tb2.getC().charValue());

        String json2 = JSON.toJSONString(tb2);
        JSONObject jo = JSON.parseObject(json2);

        TestBean tb12 = jo.toJavaObject(TestBean.class);

Reported by PMD.

JUnit assertions should include a message
Design

Line: 18 

                      assertEquals('c', tb1.getC());

        TestBean2 tb2 = JSON.parseObject(json, TestBean2.class);
        assertEquals('c', tb2.getC().charValue());

        String json2 = JSON.toJSONString(tb2);
        JSONObject jo = JSON.parseObject(json2);

        TestBean tb12 = jo.toJavaObject(TestBean.class);

Reported by PMD.

Potential violation of Law of Demeter (method chain calls)
Design

Line: 18 

                      assertEquals('c', tb1.getC());

        TestBean2 tb2 = JSON.parseObject(json, TestBean2.class);
        assertEquals('c', tb2.getC().charValue());

        String json2 = JSON.toJSONString(tb2);
        JSONObject jo = JSON.parseObject(json2);

        TestBean tb12 = jo.toJavaObject(TestBean.class);

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 23 

                      String json2 = JSON.toJSONString(tb2);
        JSONObject jo = JSON.parseObject(json2);

        TestBean tb12 = jo.toJavaObject(TestBean.class);
        assertEquals('c', tb12.getC());

        TestBean2 tb22 = jo.toJavaObject(TestBean2.class);
        assertEquals('c', tb22.getC().charValue());
    }

Reported by PMD.

JUnit assertions should include a message
Design

Line: 24 

                      JSONObject jo = JSON.parseObject(json2);

        TestBean tb12 = jo.toJavaObject(TestBean.class);
        assertEquals('c', tb12.getC());

        TestBean2 tb22 = jo.toJavaObject(TestBean2.class);
        assertEquals('c', tb22.getC().charValue());
    }

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 24 

                      JSONObject jo = JSON.parseObject(json2);

        TestBean tb12 = jo.toJavaObject(TestBean.class);
        assertEquals('c', tb12.getC());

        TestBean2 tb22 = jo.toJavaObject(TestBean2.class);
        assertEquals('c', tb22.getC().charValue());
    }

Reported by PMD.

src/main/java/com/alibaba/fastjson/serializer/ByteBufferCodec.java
15 issues
Potential violation of Law of Demeter (object not created locally)
Design

Line: 17 

                  @Override
    public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
        ByteBufferBean bean = parser.parseObject(ByteBufferBean.class);
        return (T) bean.byteBuffer();
    }

    @Override
    public int getFastMatchToken() {
        return JSONToken.LBRACKET;

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 29 

                  public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
        ByteBuffer byteBuf = (ByteBuffer) object;

        byte[] array = byteBuf.array();

        SerializeWriter out = serializer.out;
        out.write('{');

        out.writeFieldName("array");

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 32 

                      byte[] array = byteBuf.array();

        SerializeWriter out = serializer.out;
        out.write('{');

        out.writeFieldName("array");
        out.writeByteArray(array);
        out.writeFieldValue(',', "limit", byteBuf.limit());
        out.writeFieldValue(',', "position", byteBuf.position());

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 34 

                      SerializeWriter out = serializer.out;
        out.write('{');

        out.writeFieldName("array");
        out.writeByteArray(array);
        out.writeFieldValue(',', "limit", byteBuf.limit());
        out.writeFieldValue(',', "position", byteBuf.position());

        out.write('}');

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 35 

                      out.write('{');

        out.writeFieldName("array");
        out.writeByteArray(array);
        out.writeFieldValue(',', "limit", byteBuf.limit());
        out.writeFieldValue(',', "position", byteBuf.position());

        out.write('}');
    }

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 36 

              
        out.writeFieldName("array");
        out.writeByteArray(array);
        out.writeFieldValue(',', "limit", byteBuf.limit());
        out.writeFieldValue(',', "position", byteBuf.position());

        out.write('}');
    }

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 36 

              
        out.writeFieldName("array");
        out.writeByteArray(array);
        out.writeFieldValue(',', "limit", byteBuf.limit());
        out.writeFieldValue(',', "position", byteBuf.position());

        out.write('}');
    }

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 37 

                      out.writeFieldName("array");
        out.writeByteArray(array);
        out.writeFieldValue(',', "limit", byteBuf.limit());
        out.writeFieldValue(',', "position", byteBuf.position());

        out.write('}');
    }

    public static class ByteBufferBean {

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 37 

                      out.writeFieldName("array");
        out.writeByteArray(array);
        out.writeFieldValue(',', "limit", byteBuf.limit());
        out.writeFieldValue(',', "position", byteBuf.position());

        out.write('}');
    }

    public static class ByteBufferBean {

Reported by PMD.

Potential violation of Law of Demeter (object not created locally)
Design

Line: 39 

                      out.writeFieldValue(',', "limit", byteBuf.limit());
        out.writeFieldValue(',', "position", byteBuf.position());

        out.write('}');
    }

    public static class ByteBufferBean {
        public byte[] array;
        public int limit;

Reported by PMD.

src/test/java/com/alibaba/json/bvt/parser/autoType/AutoTypeTest0.java
15 issues
JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 10 

               * Created by wenshao on 10/02/2017.
 */
public class AutoTypeTest0 extends TestCase {
    public void test_0() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$Model\",\"id\":123}";
        Model model = JSON.parseObject(text, Model.class);
        assertEquals(123, model.id);

        Model model2 = (Model) JSON.parse(text);

Reported by PMD.

Unit tests should not contain more than 1 assert(s).
Design

Line: 10 

               * Created by wenshao on 10/02/2017.
 */
public class AutoTypeTest0 extends TestCase {
    public void test_0() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$Model\",\"id\":123}";
        Model model = JSON.parseObject(text, Model.class);
        assertEquals(123, model.id);

        Model model2 = (Model) JSON.parse(text);

Reported by PMD.

JUnit assertions should include a message
Design

Line: 13 

                  public void test_0() throws Exception {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$Model\",\"id\":123}";
        Model model = JSON.parseObject(text, Model.class);
        assertEquals(123, model.id);

        Model model2 = (Model) JSON.parse(text);
        assertEquals(123, model2.id);
    }

Reported by PMD.

JUnit assertions should include a message
Design

Line: 16 

                      assertEquals(123, model.id);

        Model model2 = (Model) JSON.parse(text);
        assertEquals(123, model2.id);
    }

    public void test_nested() {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$ModelNested\",\"id\":123, \"nested\":{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$ModelNested\",\"id\":456, \"nested\":null}}";

Reported by PMD.

Unit tests should not contain more than 1 assert(s).
Design

Line: 19 

                      assertEquals(123, model2.id);
    }

    public void test_nested() {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$ModelNested\",\"id\":123, \"nested\":{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$ModelNested\",\"id\":456, \"nested\":null}}";

        ModelNested model = JSON.parseObject(text, ModelNested.class);
        assertEquals(123, model.id);
        ModelNested nested1 = model.nested;

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 19 

                      assertEquals(123, model2.id);
    }

    public void test_nested() {
        String text = "{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$ModelNested\",\"id\":123, \"nested\":{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$ModelNested\",\"id\":456, \"nested\":null}}";

        ModelNested model = JSON.parseObject(text, ModelNested.class);
        assertEquals(123, model.id);
        ModelNested nested1 = model.nested;

Reported by PMD.

JUnit assertions should include a message
Design

Line: 23 

                      String text = "{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$ModelNested\",\"id\":123, \"nested\":{\"@type\":\"com.alibaba.json.bvt.parser.autoType.AutoTypeTest0$ModelNested\",\"id\":456, \"nested\":null}}";

        ModelNested model = JSON.parseObject(text, ModelNested.class);
        assertEquals(123, model.id);
        ModelNested nested1 = model.nested;
        assertEquals(456, nested1.id);
        assertNull(nested1.nested);

        ModelNested model2 = (ModelNested) JSON.parse(text);

Reported by PMD.

JUnit assertions should include a message
Design

Line: 25 

                      ModelNested model = JSON.parseObject(text, ModelNested.class);
        assertEquals(123, model.id);
        ModelNested nested1 = model.nested;
        assertEquals(456, nested1.id);
        assertNull(nested1.nested);

        ModelNested model2 = (ModelNested) JSON.parse(text);
        assertEquals(123, model2.id);
        ModelNested nested2 = model2.nested;

Reported by PMD.

JUnit assertions should include a message
Design

Line: 26 

                      assertEquals(123, model.id);
        ModelNested nested1 = model.nested;
        assertEquals(456, nested1.id);
        assertNull(nested1.nested);

        ModelNested model2 = (ModelNested) JSON.parse(text);
        assertEquals(123, model2.id);
        ModelNested nested2 = model2.nested;
        assertEquals(456, nested2.id);

Reported by PMD.

JUnit assertions should include a message
Design

Line: 29 

                      assertNull(nested1.nested);

        ModelNested model2 = (ModelNested) JSON.parse(text);
        assertEquals(123, model2.id);
        ModelNested nested2 = model2.nested;
        assertEquals(456, nested2.id);
        assertNull(nested2.nested);
    }

Reported by PMD.

src/test/java/com/alibaba/json/bvt/bug/Bug_for_ludong.java
15 issues
This class has a bunch of public methods and attributes
Design

Line: 1 

              package com.alibaba.json.bvt.bug;

import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import junit.framework.TestCase;

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 15 

              
public class Bug_for_ludong extends TestCase {

    public void test_for_ludong() throws Exception {
        String msg = "{\"changedItems\":[{\"attribute\":\"new\",\"benefitCustomer\":\"chance130320584431\",\"benefitCustomerContactor\":5809917,\"benefitCustomerId\":2001385618,\"bizStatus\":\"audit_pass\",\"creator\":\"dowjons\",\"defaultBiz\":true,\"discountRate\":100,\"domain\":\"nirvana\",\"executeAmount\":3688,\"gmtCreate\":1367856000000,\"gmtModified\":1368374400000,\"gmtSign\":1367856000000,\"id\":321600616,\"isDeleted\":\"n\",\"itemNum\":\"W1305070000053_1\",\"lastOperType\":\"finance_pass_rollback\",\"memberId\":\"3592950865\",\"modifier\":\"haiquan.zhanghq\",\"num\":12,\"oppId\":103722314,\"orderId\":315749401,\"parentId\":0,\"paymentAmount\":0,\"paymentStatus\":\"payment_none\",\"policyId\":63149,\"price\":3688,\"productCode\":\"pc060\",\"purchaseType\":\"bought\",\"quotedPrice\":3688,\"salesId\":\"tiandan\",\"salesOrgFullid\":\"/10/1/30/101/160/1001/1051/\",\"serviceSupplyCompany\":\"B50\",\"signSalesId\":\"tiandan\",\"signSalesOrgFullId\":\"/10/1/30/101/160/1001/1051/\",\"traceChange\":true,\"ultimatePrice\":3688,\"unServiceDay\":0,\"unit\":\"M\",\"unvoucherAmount\":3688,\"voucherStatus\":\"voucher_none\"}],\"context\":{\"payAmount\":3688,\"payDate\":1368442850437,\"paymentStatus\":\"payment_success\"},\"generateTime\":1368442868624,\"msgType\":\"PAYMENT\",\"orderNumber\":\"W1305070000053\"}";

        OrderInternalDto dto = JSON.parseObject(msg, OrderInternalDto.class);
    }

Reported by PMD.

JUnit tests should include assert() or fail()
Design

Line: 15 

              
public class Bug_for_ludong extends TestCase {

    public void test_for_ludong() throws Exception {
        String msg = "{\"changedItems\":[{\"attribute\":\"new\",\"benefitCustomer\":\"chance130320584431\",\"benefitCustomerContactor\":5809917,\"benefitCustomerId\":2001385618,\"bizStatus\":\"audit_pass\",\"creator\":\"dowjons\",\"defaultBiz\":true,\"discountRate\":100,\"domain\":\"nirvana\",\"executeAmount\":3688,\"gmtCreate\":1367856000000,\"gmtModified\":1368374400000,\"gmtSign\":1367856000000,\"id\":321600616,\"isDeleted\":\"n\",\"itemNum\":\"W1305070000053_1\",\"lastOperType\":\"finance_pass_rollback\",\"memberId\":\"3592950865\",\"modifier\":\"haiquan.zhanghq\",\"num\":12,\"oppId\":103722314,\"orderId\":315749401,\"parentId\":0,\"paymentAmount\":0,\"paymentStatus\":\"payment_none\",\"policyId\":63149,\"price\":3688,\"productCode\":\"pc060\",\"purchaseType\":\"bought\",\"quotedPrice\":3688,\"salesId\":\"tiandan\",\"salesOrgFullid\":\"/10/1/30/101/160/1001/1051/\",\"serviceSupplyCompany\":\"B50\",\"signSalesId\":\"tiandan\",\"signSalesOrgFullId\":\"/10/1/30/101/160/1001/1051/\",\"traceChange\":true,\"ultimatePrice\":3688,\"unServiceDay\":0,\"unit\":\"M\",\"unvoucherAmount\":3688,\"voucherStatus\":\"voucher_none\"}],\"context\":{\"payAmount\":3688,\"payDate\":1368442850437,\"paymentStatus\":\"payment_success\"},\"generateTime\":1368442868624,\"msgType\":\"PAYMENT\",\"orderNumber\":\"W1305070000053\"}";

        OrderInternalDto dto = JSON.parseObject(msg, OrderInternalDto.class);
    }

Reported by PMD.

Avoid unused local variables such as 'dto'.
Design

Line: 18 

                  public void test_for_ludong() throws Exception {
        String msg = "{\"changedItems\":[{\"attribute\":\"new\",\"benefitCustomer\":\"chance130320584431\",\"benefitCustomerContactor\":5809917,\"benefitCustomerId\":2001385618,\"bizStatus\":\"audit_pass\",\"creator\":\"dowjons\",\"defaultBiz\":true,\"discountRate\":100,\"domain\":\"nirvana\",\"executeAmount\":3688,\"gmtCreate\":1367856000000,\"gmtModified\":1368374400000,\"gmtSign\":1367856000000,\"id\":321600616,\"isDeleted\":\"n\",\"itemNum\":\"W1305070000053_1\",\"lastOperType\":\"finance_pass_rollback\",\"memberId\":\"3592950865\",\"modifier\":\"haiquan.zhanghq\",\"num\":12,\"oppId\":103722314,\"orderId\":315749401,\"parentId\":0,\"paymentAmount\":0,\"paymentStatus\":\"payment_none\",\"policyId\":63149,\"price\":3688,\"productCode\":\"pc060\",\"purchaseType\":\"bought\",\"quotedPrice\":3688,\"salesId\":\"tiandan\",\"salesOrgFullid\":\"/10/1/30/101/160/1001/1051/\",\"serviceSupplyCompany\":\"B50\",\"signSalesId\":\"tiandan\",\"signSalesOrgFullId\":\"/10/1/30/101/160/1001/1051/\",\"traceChange\":true,\"ultimatePrice\":3688,\"unServiceDay\":0,\"unit\":\"M\",\"unvoucherAmount\":3688,\"voucherStatus\":\"voucher_none\"}],\"context\":{\"payAmount\":3688,\"payDate\":1368442850437,\"paymentStatus\":\"payment_success\"},\"generateTime\":1368442868624,\"msgType\":\"PAYMENT\",\"orderNumber\":\"W1305070000053\"}";

        OrderInternalDto dto = JSON.parseObject(msg, OrderInternalDto.class);
    }

    public static class OrderInternalDto implements Serializable {

        private static final long   serialVersionUID = 3228508302993121205L;

Reported by PMD.

Private field 'generateTime' could be made final; it is only initialized in the declaration or constructor.
Design

Line: 27 

              
        /* 对象生成的时间 */

        private Date                generateTime;

        /** 订单号 */

        private String              orderNumber;

Reported by PMD.

Found non-transient, non-static member. Please mark as transient or provide accessors.
Error

Line: 27 

              
        /* 对象生成的时间 */

        private Date                generateTime;

        /** 订单号 */

        private String              orderNumber;

Reported by PMD.

Avoid unused private fields such as 'orderNumber'.
Design

Line: 31 

              
        /** 订单号 */

        private String              orderNumber;

        /** 对象的业务状态 */

        private MSGTYPE             msgType;

Reported by PMD.

Avoid unused private fields such as 'msgType'.
Design

Line: 35 

              
        /** 对象的业务状态 */

        private MSGTYPE             msgType;

        /** 订单的瞬时状态 */

        // private List<OrdOrderItemDto> instantItems;

Reported by PMD.

Avoid unused private fields such as 'changedItems'.
Design

Line: 43 

              
        /** 发生状态变化的订单行列,比如到款只是对一个订单行发生到账行为 */

        private List<OrdOrderItem>  changedItems;

        /** 上下文参数 */

        private Map<String, Object> context;

Reported by PMD.

Found non-transient, non-static member. Please mark as transient or provide accessors.
Error

Line: 47 

              
        /** 上下文参数 */

        private Map<String, Object> context;

        public OrderInternalDto(){

            this.generateTime = new Date();

Reported by PMD.

src/test/java/com/alibaba/json/bvt/parser/deser/DefaultObjectDeserializerTest5.java
15 issues
JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 15 

              
public class DefaultObjectDeserializerTest5 extends TestCase {

    public void test_error() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[]", new TypeReference<Map<Object, Object>>() {
            });
        } catch (Exception ex) {

Reported by PMD.

Avoid catching generic exceptions such as NullPointerException, RuntimeException, Exception in try-catch block
Design

Line: 20 

                      try {
            JSON.parseObject("[]", new TypeReference<Map<Object, Object>>() {
            });
        } catch (Exception ex) {
            error = ex;
        }
        Assert.assertNotNull(error);
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 26 

                      Assert.assertNotNull(error);
    }

    public void test_error_2() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject(",]", new TypeReference<Map<Object, Object>>() {
            });
        } catch (Exception ex) {

Reported by PMD.

Avoid catching generic exceptions such as NullPointerException, RuntimeException, Exception in try-catch block
Design

Line: 31 

                      try {
            JSON.parseObject(",]", new TypeReference<Map<Object, Object>>() {
            });
        } catch (Exception ex) {
            error = ex;
        }
        Assert.assertNotNull(error);
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 37 

                      Assert.assertNotNull(error);
    }
    
    public void test_error_3() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[{},{\"$ref\":0}]",
                             new TypeReference<List<Map<Object, Object>>>() {
                             });

Reported by PMD.

Avoid catching generic exceptions such as NullPointerException, RuntimeException, Exception in try-catch block
Design

Line: 43 

                          JSON.parseObject("[{},{\"$ref\":0}]",
                             new TypeReference<List<Map<Object, Object>>>() {
                             });
        } catch (Exception ex) {
            error = ex;
        }
        Assert.assertNotNull(error);
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 49 

                      Assert.assertNotNull(error);
    }
    
    public void test_error_4() throws Exception {
        Exception error = null;
        try {
            JSON.parseObject("[{},{\"$ref\":\"$[0]\",}]",
                             new TypeReference<List<Map<Object, Object>>>() {
                             });

Reported by PMD.

Avoid catching generic exceptions such as NullPointerException, RuntimeException, Exception in try-catch block
Design

Line: 55 

                          JSON.parseObject("[{},{\"$ref\":\"$[0]\",}]",
                             new TypeReference<List<Map<Object, Object>>>() {
                             });
        } catch (Exception ex) {
            error = ex;
        }
        Assert.assertNotNull(error);
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 61 

                      Assert.assertNotNull(error);
    }

    public void test_0() throws Exception {
        List<Map<Object, Object>> list = JSON.parseObject("[{},{\"$ref\":\"$[0]\"}]",
                                                          new TypeReference<List<Map<Object, Object>>>() {
                                                          });
        Assert.assertSame(list.get(0), list.get(1));
    }

Reported by PMD.

JUnit 4 tests that execute tests should use the @Test annotation, JUnit 5 tests should use @Test, @RepeatedTest, @TestFactory, @TestTemplate or @ParameterizedTest
Design

Line: 68 

                      Assert.assertSame(list.get(0), list.get(1));
    }

    public void test_1() throws Exception {
        Map<Object, Map<Object, Object>> map = JSON.parseObject("{\"1\":{},\"2\":{\"$ref\":\"$\"}}",
                                                                new TypeReference<Map<Object, Map<Object, Object>>>() {
                                                                });
        Assert.assertSame(map, map.get("2"));
    }

Reported by PMD.