使用XSD解析XML消息

通过JMS侦听器接收xml消息，并根据XSD验证该消息。尽管消息有效，但有时该消息被视为无效，并引发以下异常

中的xml消息没有使用UTF-8编码，消息只是以root开始和结束

Msg Format :
<root>
<Message>Sample Message</Message>
</root>

错误日志：

Exception 
        at com.ibm.ejs.jms.listener.MDBWrapper$PriviledgedOnMessage.run(MDBWrapper.java:302)
        at java.security.AccessController.doPrivileged(AccessController.java:192)
        at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:65)
        at com.ibm.ejs.jms.listener.MDBWrapper.callOnMessage(MDBWrapper.java:271)
        at com.ibm.ejs.jms.listener.MDBWrapper.onMessage(MDBWrapper.java:240)
        at com.ibm.mq.jms.MQSession.run(MQSession.java:1695)
        at com.ibm.ejs.jms.JMSSessionHandle.run(JMSSessionHandle.java:1040)
        at com.ibm.ejs.jms.listener.ServerSession.connectionConsumerOnMessage(ServerSession.java:1031)
        at com.ibm.ejs.jms.listener.ServerSession.onMessage(ServerSession.java:711)
        at com.ibm.ejs.jms.listener.ServerSession.dispatch(ServerSession.java:678)
        at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:619)
        at com.ibm.ejs.jms.listener.ServerSessionDispatcher.dispatch(ServerSessionDispatcher.java:44)
        at com.ibm.ejs.container.MDBWrapper.onMessage(MDBWrapper.java:100)
        at com.ibm.ejs.container.MDBWrapper.onMessage(MDBWrapper.java:136)
        at com.ibm.ejs.jms.listener.ServerSession.run(ServerSession.java:536)
        at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)
Caused by: java.lang.ArrayIndexOutOfBoundsException
        at org.apache.xerces.impl.xs.opti.SchemaDOM.endElement(Unknown Source)
        at org.apache.xerces.impl.xs.opti.SchemaDOMParser.endElement(Unknown Source)
        at org.apache.xerces.impl.xs.traversers.SchemaContentHandler.endElement(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.loadSchema(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
        at org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
        at javax.xml.validation.SchemaFactory.newSchema(Unknown Source)

        ... 24 more

---

这个异常并不是抱怨XML文档无效，而是首先未能加载模式。嗨，Ian，感谢您的响应。但它很少也不是每次都无法加载，就像100次中的一次，这种情况只发生一次。我想知道如何解决这个问题。您是否可以先加载一次Schema对象，然后在每次解析操作中重用它，或者它不是线程安全的？服务bean中提到了Schema的详细信息，因此它将在JVM启动期间加载。这就是为什么它工作正常，但有时会失败，不确定原因是什么。

Exception 
        at com.ibm.ejs.jms.listener.MDBWrapper$PriviledgedOnMessage.run(MDBWrapper.java:302)
        at java.security.AccessController.doPrivileged(AccessController.java:192)
        at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:65)
        at com.ibm.ejs.jms.listener.MDBWrapper.callOnMessage(MDBWrapper.java:271)
        at com.ibm.ejs.jms.listener.MDBWrapper.onMessage(MDBWrapper.java:240)
        at com.ibm.mq.jms.MQSession.run(MQSession.java:1695)
        at com.ibm.ejs.jms.JMSSessionHandle.run(JMSSessionHandle.java:1040)
        at com.ibm.ejs.jms.listener.ServerSession.connectionConsumerOnMessage(ServerSession.java:1031)
        at com.ibm.ejs.jms.listener.ServerSession.onMessage(ServerSession.java:711)
        at com.ibm.ejs.jms.listener.ServerSession.dispatch(ServerSession.java:678)
        at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:619)
        at com.ibm.ejs.jms.listener.ServerSessionDispatcher.dispatch(ServerSessionDispatcher.java:44)
        at com.ibm.ejs.container.MDBWrapper.onMessage(MDBWrapper.java:100)
        at com.ibm.ejs.container.MDBWrapper.onMessage(MDBWrapper.java:136)
        at com.ibm.ejs.jms.listener.ServerSession.run(ServerSession.java:536)
        at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)
Caused by: java.lang.ArrayIndexOutOfBoundsException
        at org.apache.xerces.impl.xs.opti.SchemaDOM.endElement(Unknown Source)
        at org.apache.xerces.impl.xs.opti.SchemaDOMParser.endElement(Unknown Source)
        at org.apache.xerces.impl.xs.traversers.SchemaContentHandler.endElement(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.loadSchema(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
        at org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
        at javax.xml.validation.SchemaFactory.newSchema(Unknown Source)

        ... 24 more