SOS!servlet報http status500問題
HTTP   STATUS   500-
TYPE   Exception   report
message
description   The   server   encountered   an   internal   error   ()   that   prevented   it   from   fulfilling   this   request.
exception  

javax.servlet.ServletException:   Error   allocating   a   servlet   instance
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
java.lang.Thread.run(Unknown   Source)


root   cause  

java.lang.NoClassDefFoundError:   test/Test   (wrong   name:   Test)
java.lang.ClassLoader.defineClass1(Native   Method)
java.lang.ClassLoader.defineClass(Unknown   Source)
java.security.SecureClassLoader.defineClass(Unknown   Source)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1779)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:866)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1319)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
java.lang.Thread.run(Unknown   Source)


note   The   full   stack   trace   of   the   root   cause   is   available   in   the   Apache   Tomcat/5.5.15   logs.
servlet編譯過了,輸入http://localhost:8080/myapp/Test報這個錯誤,是啥問題.


------解决方案--------------------
你的数据库连接有一点问题.tomcat6.0试试
我刚用的时候也出现过你这种问题.

我的异常网推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.aiyiweb.com/java-web/317.html