java.lang.reflect.InvocationTargetException如何解决？？？

Spring89 2011-05-31 10:13:27

以下异常出自多线程下载，实在找不出原因！请各位帮我看看，谢谢了......
问题描述：多线程下载文件，如果文件小于30M，那么可以正常下载完成，否则出现以下问题！
我怀疑是下面这段代码的问题：

// 保存每个线程读取的数据

byte[] finallData = new byte[Integer.parseInt(String.valueOf(this.getFileLength()))];

2011-5-31 10:07:37 org.apache.struts.actions.DispatchAction dispatchMethod

严重: Dispatch[/picture] to method 'download' returned an exception

java.lang.reflect.InvocationTargetException

	at sun.reflect.GeneratedMethodAccessor71.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)

	at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274)

	at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)

	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)

	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)

	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)

	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)

	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)

	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)

	at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.OutOfMemoryError: Java heap space

2011-5-31 10:07:37 org.apache.struts.action.RequestProcessor processException

警告: Unhandled Exception thrown: class javax.servlet.ServletException

2011-5-31 10:07:37 org.apache.catalina.core.StandardWrapperValve invoke

严重: Servlet.service() for servlet action threw exception

java.lang.OutOfMemoryError: Java heap space

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zhengyuyan_521 2011-06-03

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Caused by: java.lang.OutOfMemoryError: Java heap space
把tomcat的虚拟内存改一下-Xmx=256m就OK了

yuyangyang0610 2011-06-03

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Caused by: java.lang.OutOfMemoryError: Java heap space
内存溢出，调下内存吧

Spring89 2011-06-01

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int len = Integer.parseInt(String.valueOf(this.getFileLength()));//end - begin

System.out.println("int Len:"+len);

// 保存每个线程读取的数据

byte b[] = new byte[len];

System.out.println("b="+b);

当执行到byte b[] = new byte[len];时抛出java.lang.reflect.InvocationTargetException导致内存溢出java.lang.OutOfMemoryError: Java heap space

而int Len已打印出来为54095475是一个50M文件，小于50M就可以，大于50M就出些问题！
请问，这是为什么...？急......

Spring89 2011-06-01

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[Quote=引用 5 楼 licip 的回复:]
你看看代码,适当释放一些内存出来.如果没有用的话.
[/Quote]
呵呵，大哥，我看不出来了...

licip 2011-06-01

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你看看代码,适当释放一些内存出来.如果没有用的话.

Spring89 2011-06-01

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自己先顶起来，求高手给予解答...

Spring89 2011-06-01

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啊，就是在上面的那一段代码中出现的。
执行到byte b[] = new byte[len];
这里时就抛出了异常......
debug时执行到这里就已经不执行了.

wangjintao110 2011-06-01

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2011-5-31 10:07:37 org.apache.struts.actions.DispatchAction dispatchMethod
严重: Dispatch[/picture] to method 'download' returned an exception
java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor71.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.www.cctv40.comStandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.OutOfMemoryError: Java heap space
2011-5-31 10:07:37 org.apache.struts.action.RequestProcessor processException
警告: Unhandled Exception thrown: class javax.servlet.ServletException
2011-5-31 10:07:37 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.OutOfMemoryError: Java heap space

这个问题好复杂。。。。。。。。。。

Spring89 2011-05-31