Question

我一直在尝试使用Gson将EMF（Eclipse建模框架）模型对象序列化为Json。但是我遇到了堆栈溢出错误，这种错误似乎发生在类将其containment属性设置为true时。 在EMF模型上使用GSON是否有任何已知限制？

以下链接是我试图序列化的（相当简单的）EMF模型。请注意，如果我创建＆＃34;子块＆＃34;的包含属性，则不会发生错误。在Chip内部为false（在这种情况下JSON正确生成）：

数据被实例化，Gson编写者调用如下：

 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();
    }

堆栈追踪：

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sunrise76，弄清楚问题是什么。所有EMF类都继承自EObject，它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，然后进行设置。

使用GSON将EMF对象序列化为JSON时出现堆栈溢出错误

1 个答案: