JPA状态变化与内存直接的关系？

Question

循环中执行代码:
if (entity != null) {
Object _object = getJpa().merge(entity);
if(_object == null)
{
return;
}
this.getJpa().remove(_object);
this.getJpa().flush();
}
执行出现OOM异常:
循环中执行代码:
if (entity != null) {
Object _object = getJpa().merge(entity);
if(_object == null)
{
return;
}
this.getJpa().remove(_object);
this.getJpa().flush();
}
执行出现OOM异常:

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.nm.server.comm.messagesvr.MessageParserTask.run(MessageParserTask.java:179)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.OutOfMemoryError: GC overhead limit exceeded
at sun.reflect.UnsafeLongFieldAccessorImpl.get(UnsafeLongFieldAccessorImpl.java:18)
at java.lang.reflect.Field.get(Field.java:358)
at org.eclipse.persistence.internal.descriptors.InstanceVariableAttributeAccessor.getAttributeValueFromObject(InstanceVariableAttributeAccessor.java:76)
at org.eclipse.persistence.mappings.DatabaseMapping.getAttributeValueFromObject(DatabaseMapping.java:516)
at org.eclipse.persistence.mappings.foundation.AbstractDirectMapping.compareObjects(AbstractDirectMapping.java:440)
at org.eclipse.persistence.mappings.foundation.AbstractDirectMapping.compareForChange(AbstractDirectMapping.java:392)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.createObjectChangeSetThroughComparison(DeferredChangeDetectionPolicy.java:165)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.createObjectChangeSet(DeferredChangeDetectionPolicy.java:137)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.calculateChanges(DeferredChangeDetectionPolicy.java:89)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.calculateChangesForExistingObject(DeferredChangeDetectionPolicy.java:54)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.calculateChanges(UnitOfWorkImpl.java:636)
at org.

去掉flush()就没有问题了，
大神求解

Answer 1

不知道你这个问题是否已经解决, 如果还没有解决的话:

• 文章：jpa在批量添加的时候，存储慢如何解决问题 中也许有你想要的答案，请看下吧

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