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HTTP Status 500 - Error instantiating servlet class com.*.servlet.TestServlet

2015-12-04 15:04 633 查看

type Exception report
message Error instantiating servlet class com.Hannah.servlet.TestServlet
description The server encountered an internal error that prevented it from fulfilling this request.
exception

javax.servlet.ServletException: Error instantiating servlet class com.Hannah.servlet.TestServlet
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:722)

root cause

java.lang.ClassNotFoundException: com.Hannah.servlet.TestServlet
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:722)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.55 logs.

解决方法：
1. 先确认下 project->build automatically是否勾选上
　　2. 如果选上了,还不能class文件, 就手动编译:选中工程，然后 project->clean....->选第2个Clean projects selected below, 选择OK。
　　3.如果以上2步都无法编译出class文件，那就是项目设置出问题了。project->properties->java build path->source->src，将Default output folder设置为[项目名]/WebRoot/WEB-INF/classes,点击OK。
　　4.如果以上3步依然无法解决问题，首先请检查项目是否报错，以及引用的jar包是否路径都正确。jar路径不对的话，project->properties->java build path->Libraries,将jar路径不正确的引用remove了，然后Add
Extenal JARs，重新添加jar包。

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标签： servlet

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