[BUG] Fastjson JSON.toJSON异常

[Cooper-Zhong]

问题描述

类似#2187，但代码使用maven依赖在mac上运行时，fastjson和fastjson2的结果不一样。在clone下来的源码中运行时，出现stackoverflow error。

环境信息

Environment of cloned source code:

• OS信息： [Ubuntu 22.04.3 LTS (GNU/Linux 6.2.0-36-generic x86_64)]
• JDK信息： [Openjdk 1.8.0_382]
• 版本信息：[Fastjson 2.0.50-SNAPSHOT] (perhaps?)

On laptop：

• OS信息： [MacOS 12.7.4 M1 Pro 16 GB]
• JDK信息： [Openjdk 17.0.6]
• 版本信息：[Fastjson 2.0.49]

重现步骤

import com.alibaba.fastjson2.*;
import com.google.common.collect.Lists;
import lombok.Data;
import org.junit.jupiter.api.Test;

import java.util.Arrays;
import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

public class Issue2187Mutated_119 {

    @Test
    public void testMutated() throws Exception {
        BeanMutated bean = new BeanMutated();
        bean.value = bean;
        JSONObject json = (JSONObject) JSON.toJSON(bean);
        assertSame(json, json.get("value"));
    }

    @Test
    public void testMutatedfj() throws Exception {
        BeanMutated bean = new BeanMutated();
        bean.value = bean;
        com.alibaba.fastjson.JSONObject json = (com.alibaba.fastjson.JSONObject) com.alibaba.fastjson.JSON.toJSON(bean);
        assertSame(json, json.get("value"));
    }

    public static class BeanMutated {
        public BeanMutated value;
    }

    @Test
    public void testMutated1() throws Exception {
        Bean1Mutated bean = new Bean1Mutated();
        bean.values = Arrays.asList(bean);
        JSONObject json = (JSONObject) JSON.toJSON(bean);
        assertSame(json, json.getJSONArray("values").get(0));
    }

    @Test
    public void testMutated1fj() throws Exception {
        Bean1Mutated bean = new Bean1Mutated();
        bean.values = Arrays.asList(bean);
        com.alibaba.fastjson.JSONObject json = (com.alibaba.fastjson.JSONObject) com.alibaba.fastjson.JSON.toJSON(bean);
        assertSame(json, json.getJSONArray("values").get(0));
    }

    public static class Bean1Mutated {
        public List<Bean1Mutated> values;
    }

    @Data
    public class DynFormDtoMutated {
        private String sysName;
        private String name;
        private boolean enableTab;
        private int labelColSize;
        private String title;
        private String hint;
        private List<DynFormComponentDtoMutated> componentList;
        private String notes;
    }

    @Data
    public class DynFormComponentDtoMutated {
        private String name;
        private String nameText;
        private String functionName;
        private String compTypeName;
        private JSONObject props; // 组件完整配置
        private int widthColSize;
        protected int widthPercentage; //宽度百分比
        private String tabName;
        private boolean enabled;
        private long uid;
        private long parentFieldId;

        private List<DynFormComponentDtoMutated> subComponentList; //子组件集合

        public List<DynFormComponentDtoMutated> getFlatComponentDtosMutated() {
            List<DynFormComponentDtoMutated> flatList = Lists.newArrayList();
            flatList.add(this);
            if (this.subComponentList!= null) {
                for (DynFormComponentDtoMutated tmpDto : this.subComponentList) {
                    tmpDto.setParentFieldId(this.uid);
                    flatList.addAll(tmpDto.getFlatComponentDtosMutated());
                }
            }
            return flatList;
        }
    }
}

期待的正确结果

能够成功解析

相关日志输出

• On Mac:
  Expected :{"values":[null]}
  Actual :null
  at Issue2187Mutated_119.testMutated1fj(Issue2187Mutated_119.java:50)

  Expected :{"value":{"value":{"$ref":".."}}}
  Actual :{value=(this Map)}
  at Issue2187Mutated_119.testMutated1fj(Issue2187Mutated_119.java:50)

• Run in cloned repository:
  java.lang.StackOverflowError
  at java.lang.reflect.Field.get(Field.java:393)
  at com.alibaba.fastjson.util.FieldInfo.get(FieldInfo.java:572)
  at com.alibaba.fastjson.serializer.FieldSerializer.getPropertyValue(FieldSerializer.java:151)
  at com.alibaba.fastjson.serializer.JavaBeanSerializer.getFieldValuesMap(JavaBeanSerializer.java:799)
  at com.alibaba.fastjson.JSON.toJSON(JSON.java:1221)
  at com.alibaba.fastjson.JSON.toJSON(JSON.java:1168)

[Cooper-Zhong]

fastjson的test在2.0.49能返回结果，在2.0.51-SNAPSHOT会报StackOverflowError