使用GSON将EMF对象序列化为JSON时出现堆栈溢出错误

Question

我一直在尝试使用Gson将EMF（Eclipse建模框架）模型对象序列化到Json。然而，我遇到了堆栈溢出错误，当类的包含属性设置为true时，这种错误似乎会发生。他们在EMF模型上使用GSON有任何已知的限制吗？

下面链接的是我尝试序列化的（相当简单的）EMF 模型。请注意，如果我将 Chip 中“子块”的包含属性设为 false（在这种情况下，JSON 会正确生成），则不会发生错误：

我的EMF模型

数据被实例化，Gson编写器调用如下：

 Chip createChip = PackageFactory.eINSTANCE.createChip();
    createChip.setChipName("hello");
    createChip.setChipDesc("helloworld");;
    subBlockFields createsubBlockFields = PackageFactory.eINSTANCE.createsubBlockFields();
    createsubBlockFields.setField1("this is field1");
    createsubBlockFields.setField2("this is field 2");
    subBlock createsubBlock = PackageFactory.eINSTANCE.createsubBlock();
    createsubBlock.setAge(3);
    createsubBlock.setFieldName("this is subblock");
    createsubBlock.setFields(createsubBlockFields);
    createChip.getSubblocks().add(createsubBlock);
    Gson gson = new GsonBuilder().setPrettyPrinting().create();
    String jsonpp = gson.toJson(createChip);
    try{
    FileWriter writer  = new FileWriter ("C:\\Temp\\emftry.json");
    writer.write(jsonpp);
    writer.close();
    }

堆栈跟踪:

Exception in thread "main" java.lang.StackOverflowError
       at java.util.LinkedHashMap$LinkedHashIterator.<init>(LinkedHashMap.java:366)
       at java.util.LinkedHashMap$LinkedHashIterator.<init>(LinkedHashMap.java:366)
        at java.util.LinkedHashMap$ValueIterator.<init>(LinkedHashMap.java:408)
at java.util.LinkedHashMap$ValueIterator.<init>(LinkedHashMap.java:408)
at java.util.LinkedHashMap.newValueIterator(LinkedHashMap.java:418)
at java.util.HashMap$Values.iterator(HashMap.java:1038)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:197)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:89)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:200)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:89)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:200)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:89)
    .
    .

Answer 1

谢谢日出76，弄清楚了问题所在。所有EMF类都继承自EObject，EObject具有导致递归的某些字段：eAttributes，eContainer，eContent。使用排除策略忽略这些字段，即可设置。