Question

知道为什么我从以下代码中收到此错误？。。 ..

PrintWriter writer = response.getWriter();
Collection<Alert> alerts = AppState.instance.bi.getBackend().getNewerAlerts(time);
System.out.println("Alerts size = " + alerts.size());  
Gson gson = gsonBuilder.create();
gson.toJson(new AlertsResponse(alerts), AlertsResponse.class, writer);

线程中的异常＆＃34; http-bio-80-exec-11＆＃34; java.lang.StackOverflowError的 at java.util.LinkedHashMap $ LinkedHashIterator。（Unknown Source） at java.util.LinkedHashMap $ LinkedHashIterator。（Unknown Source） at java.util.LinkedHashMap $ ValueIterator。（Unknown Source） at java.util.LinkedHashMap $ ValueIterator。（Unknown Source） at java.util.LinkedHashMap.newValueIterator（Unknown Source） at java.util.HashMap $ Values.iterator（Unknown Source）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:192）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.ObjectTypeAdapter.write（ObjectTypeAdapter.java:105）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.ObjectTypeAdapter.write（ObjectTypeAdapter.java:105）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.ObjectTypeAdapter.write（ObjectTypeAdapter.java:105）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.ObjectTypeAdapter.write（ObjectTypeAdapter.java:105）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.ObjectTypeAdapter.write（ObjectTypeAdapter.java:105）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）在com.google.gson.internal.bind.ObjectTypeAdapter.write（ObjectTypeAdapter.java:105）在com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write（TypeAdapterRuntimeTypeWrapper.java:68）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ 1.write（ReflectiveTypeAdapterFactory.java:89）在com.google.gson.internal.bind.ReflectiveTypeAdapterFactory $ Adapter.write（ReflectiveTypeAdapterFactory.java:195）

Answer 1

AlertsResponse类层次结构中的一个字段导致循环引用，导致堆栈溢出。

识别导致此问题的字段，并在字段前使用@Expose(serialize = false)注释更改结构或阻止序列化，例如

@Expose(serialize = false) public SelfReferencingObject notMe;

从com.google.gson.Gson.toJson获取StackOverflowError（对象arg0，类型arg1，可附加arg2）

1 个答案: