JAXB 解析错误：ArrayIndexOutOfBoundsException

Question

我面临一个问题，我没有任何线索可以解决它！

问题很简单，我从 XSD 文件生成 JAXB 类。 （一个真正复杂的）。但是当编组发生时，我得到一个超出范围的数组索引：[在此处插入随机负数]

    javax.ejb.EJBException: The bean encountered a non-application exception; nested exception is: 
    java.lang.ArrayIndexOutOfBoundsException: Array index out of range: -11
    at org.apache.openejb.core.ivm.BaseEjbProxyHandler.convertException(BaseEjbProxyHandler.java:358)
    at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:286)
    at com.sun.proxy.$Proxy60.parseXMLFromData(Unknown Source)
    at com.michelin.v2k.services.bo.integration.impl.CasingBufferServiceTestCase.generateDOOMessage(CasingBufferServiceTestCase.java:106)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:76)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:607)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at com.michelin.v2k.V2KAbstractTestCase$1$1.evaluate(V2KAbstractTestCase.java:236)
    at org.junit.rules.RunRules.evaluate(RunRules.java:18)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.ArrayIndexOutOfBoundsException: Array index out of range: -11
    at com.sun.xml.bind.v2.util.CollisionCheckStack.findDuplicate(CollisionCheckStack.java:112)
    at com.sun.xml.bind.v2.util.CollisionCheckStack.push(CollisionCheckStack.java:53)
    at com.sun.xml.bind.v2.runtime.XMLSerializer.pushObject(XMLSerializer.java:471)
    at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:574)
    at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:113)
    at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:286)
    at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:283)
    at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:619)
    at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:113)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:98)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:127)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(ElementBeanInfoImpl.java:244)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:251)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:33)
    at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:461)
    at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:292)
    at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:221)
    at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:95)
    at com.michelin.v2k.services.bo.integration.impl.CasingBufferService.parseXMLFromData(CasingBufferService.java:450)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:76)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:607)
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:158)
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:141)
    at com.michelin.xnet.ejb.config.GuiceInterceptor.intercept(GuiceInterceptor.java:77)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:76)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:607)
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:158)
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:141)
    at org.apache.openejb.core.interceptor.InterceptorStack.invoke(InterceptorStack.java:122)
    at org.apache.openejb.core.stateless.StatelessContainer._invoke(StatelessContainer.java:221)
    at org.apache.openejb.core.stateless.StatelessContainer.invoke(StatelessContainer.java:174)
    at org.apache.openejb.core.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java:217)
    at org.apache.openejb.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:77)
    at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:281)
    ... 30 more

我看过很多关于这个错误的话题，说这个错误是因为编组不是线程安全的操作，所以我尝试使用 ThreadLocals 解决这个问题，但没有成功。我还尝试将所有 getter 和 setter 设置为“同步”，但它似乎也不起作用。

所以我想知道你们中是否有人遇到过这个问题，以及你是否记得你是如何解决它的。我目前不知道任何情报是否会朝着正确的方向迈出一步。

谢谢， 基里班

Answer 1

不是线程安全的 marshaller/umarshaller 意味着你不需要在任何地方使用 ThreadLocal 或 Synchronized。

您只需在每次需要编组/解组某些内容时从 JAXB 上下文中创建新的编组/解组。

您不能在发生编组/解组的方法之外的任何地方保留对 marshaller/unmarshaller 的引用。但是您可以（并且必须）在外面的某个地方拥有 JAXBContext。 甚至 ThreadLocal 也无济于事，因为线程可以从某个线程池中重用。

还要记住 - 创建 JAXBContext 是非常昂贵的操作，而 JAXBContext 是线程安全的。 Create marshaller/unmarshaller 操作非常简单，与 JAXBConetxt 相比几乎没有成本