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我正在使用 WAS 7.0，我发现了这个错误：

[27/10/13 11:55:06:727 CET] 00000023 servlet       E com.ibm.ws.webcontainer.servlet.ServletWrapper run [Servlet Error]-[class java.lang.NullPointerException: null]: java.lang.ClassNotFoundException: class java.lang.NullPointerException: null
    at java.beans.Beans.instantiate(Beans.java:190)
    at java.beans.Beans.instantiate(Beans.java:75)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper$1.run(ServletWrapper.java:1909)
    at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.loadServlet(ServletWrapper.java:1900)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:730)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)
    at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:179)
    at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3933)
    at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931)
    at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276)
    at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
    at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
    at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
    at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
    at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
    at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
    at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
    at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
    at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1604)

问题是它不会一直出现，而只会出现在我最近创建的 servlet 中（即旧的 servlet 可以工作，但新的 servlet 会抛出这个错误）。出于这个原因，我检查了所有内容是否已正确编译和链接，并且我没有看到任何与工作 servlet 不同的东西。

任何有关如何进一步调试此问题或如何解决此问题的提示都非常感谢。

提前致谢， 里奥

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2 回答 2

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我发现了问题。尽管它看起来像，但这不是平台问题，我只是忘记初始化一个 ArrayList 并且地狱崩溃了。万岁这样有用的编译器'¬¬

于 2013-10-27T16:14:21.280 回答
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The version of Java 6 included in WebSphere Application Server has the lost the fix for Java bug 4256569, which obscures the actual cause of the failure. If this issue is important to you, I recommend opening a PMR with IBM. I verified that this issue has been resolved in the Java 7 included in WebSphere Application Server 8 and later.

于 2013-11-04T16:19:53.247 回答