EJB Bean发送实体时出现StackOverFlowException

Question

作为查询的结果，我试图从EJB bean获取实体列表。 实际上大多数时候我没有得到任何异常，但是对于某些实体，我得到了StackOverFlow异常。我没有得到它发生的原因。如果我的jpa实体模型是错误的，我想我每次都会得到这个异常。

error: java.lang.StackOverflowError
at java.io.ObjectOutputStream$HandleTable.hash(ObjectOutputStream.java:2330) [:1.6.0_30]
at java.io.ObjectOutputStream$HandleTable.lookup(ObjectOutputStream.java:2263) [:1.6.0_30]
at java.io.ObjectOutputStream$ReplaceTable.lookup(ObjectOutputStream.java:2369) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1093) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330) [:1.6.0_30]
at java.util.ArrayList.writeObject(ArrayList.java:570) [:1.6.0_30]
at sun.reflect.GeneratedMethodAccessor335.invoke(Unknown Source) [:1.6.0_30]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_30]
at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_30]
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330) [:1.6.0_30]
at java.util.ArrayList.writeObject(ArrayList.java:570) [:1.6.0_30]
at sun.reflect.GeneratedMethodAccessor335.invoke(Unknown Source) [:1.6.0_30]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_30]
at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_30]
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330) [:1.6.0_30]
at java.util.ArrayList.writeObject(ArrayList.java:570) [:1.6.0_30]
at sun.reflect.GeneratedMethodAccessor335.invoke(Unknown Source) [:1.6.0_30]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_30]
at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_30]
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518) [:1.6.0_30]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483) [:1.6.0_30]
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) [:1.6.0_30]
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330) [:1.6.0_30]
at java.util.ArrayList.writeObject(ArrayList.java:570) [:1.6.0_30]
at sun.reflect.GeneratedMethodAccessor335.invoke(Unknown Source) [:1.6.0_30]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_30]
at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_30]

Answer 1

解决的办法是我的JPA模型是错误的。 一种关系中的FetchType.EAGER导致StackOverFLowEception。 我将其更改为FetchType.LAZY。