Question

我的服务器正在使用XFire来处理Web服务请求

但它的CPU占用率高达100％，有时甚至达到1000％

当我重新启动服务器并在一些请求之后，这个奇怪的问题再次出现

我扫描线程转储，占用CPU的线程是这样的：

httpWorkerThread-18028-39" daemon prio=10 tid=0xa0832800 nid=0x1d89 runnable [0x99e69000]
java.lang.Thread.State: RUNNABLE
at com.sun.xml.stream.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:892)
at com.sun.xml.stream.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:362)
at com.sun.xml.stream.XMLReaderImpl.next(XMLReaderImpl.java:568)
at org.codehaus.xfire.soap.handler.ReadHeadersHandler.invoke(ReadHeadersHandler.java:44)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.transport.DefaultEndpoint.onReceive(DefaultEndpoint.java:64)
at org.codehaus.xfire.transport.AbstractChannel.receive(AbstractChannel.java:38)
at org.codehaus.xfire.transport.http.XFireServletController.invoke(XFireServletController.java:304)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:129)
at org.codehaus.xfire.transport.http.XFireServlet.doPost(XFireServlet.java:116)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:753)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:846)

似乎XFire正在解析XML文件，但随着时间的推移，线程转储完全没有什么不同，线程就像在无限循环中一样。

但是，我没有足够的XFire经验，我无法找出导致问题的原因

我谷歌很多，发现这个topic的现象就像我的

但是，这个主题表明它可能是一个JVM错误并且使用JDK5而不是JDK6.我正在尝试使用JDK5来查看它是否会有所帮助

有人遇到过这样的问题吗？导致此问题的原因以及如何解决此问题？

很多。

Answer 1

最后，我解决了这个问题。

导致此问题的原因是JDK6 XMLStreamReader实现的错误，正如topic所述。

如何解决？

我阅读了XFire的源代码，答案在这段代码中：

XMLStreamReader reader = 
            STAXUtils.createXMLStreamReader(request.getInputStream(), 
                                            charEncoding,
                                            context);

STAXUtils.createXMLStreamReader将创建XMLInputFactory以生成XMLStreamReader。

public static XMLInputFactory getXMLInputFactory(MessageContext ctx)
{
    if (ctx == null) return xmlInputFactory;

    Object inFactoryObj = ctx.getContextualProperty(XFire.STAX_INPUT_FACTORY);

    if (inFactoryObj instanceof XMLInputFactory)
    {
        return (XMLInputFactory) inFactoryObj; 
    }
    else if (inFactoryObj instanceof String)
    {
        String inFactory = (String) inFactoryObj;
        XMLInputFactory xif = (XMLInputFactory) factories.get(inFactory);
        if (xif == null)
        {
            xif = (XMLInputFactory) createFactory(inFactory, ctx);
            configureFactory(xif,ctx);
            factories.put(inFactory, xif);
        }
        return xif;
    }

    if(!inFactoryConfigured){
        configureFactory(xmlInputFactory,ctx);
        inFactoryConfigured=true;
    }



    return xmlInputFactory;
}

在此代码中，您可以配置“xfire.stax.input.factory”XFire属性以生成XMLInputFactory，其XMLStreamReader没有错误，但是，我无法弄清楚如何设置此属性。

在我的项目中，xmlInputFactory是默认的xmlInputFactory，它是JDK的。

 /**
* Create a new instance of the factory.
* This static method creates a new factory instance. 
* This method uses the following ordered lookup procedure to determine 
* the XMLInputFactory implementation class to load: 
* Use the javax.xml.stream.XMLInputFactory system property. 
* Use the properties file "lib/stax.properties" in the JRE directory. 
* This configuration file is in standard java.util.Properties format and contains 
* the fully qualified name of the implementation class with the key being the system property defined above. 
* Use the Services API (as detailed in the JAR specification), if available, to determine the classname. 
* The Services API will look for a classname in the file META-INF/services/javax.xml.stream.XMLInputFactory 
* in jars available to the runtime. 
* Platform default XMLInputFactory instance. 
* Once an application has obtained a reference to a XMLInputFactory 
* it can use the factory to configure and obtain stream instances. 
*
* @throws FactoryConfigurationError if an instance of this factory cannot be loaded
*/
public static XMLInputFactory newInstance()
  throws FactoryConfigurationError
{
    return (XMLInputFactory) FactoryFinder.find(
  "javax.xml.stream.XMLInputFactory",
  "com.sun.xml.internal.stream.XMLInputFactoryImpl");
}

因此，您可以使用javax.xml.stream.XMLInputFactory系统属性来使用另一个XMLInputFactroy，例如wstx lib。

在XFire中解析XML导致CPU高？

1 个答案: