Tomcat 6.0 的异常处理

Question

今天写jsp代码时候遇到如下的异常，请问怎么解决啊？exception javax.servlet.ServletException: Error instantiating servlet class j2ee.project.login_controller
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
java.lang.Thread.run(Unknown Source)
root cause java.lang.NoClassDefFoundError: DB/operrate_database
j2ee.project.login_controller.<init>(login_controller.java:8)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
java.lang.reflect.Constructor.newInstance(Unknown Source)
java.lang.Class.newInstance0(Unknown Source)
java.lang.Class.newInstance(Unknown Source)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
java.lang.Thread.run(Unknown Source)

Answer 1

DB/operrate_database 
楼主检查这个类存在不， 另外检查下配置路径等

Answer 2

java.lang.NoClassDefFoundError: DB/operrate_database 
没有找到类 DB/operrate_database 
看看用该类的地方是不是类名写错了

Answer 3

DB/operrate_database没有这个包，或者是有重复的包，自己找找吧

Answer 4

很明显java.lang.NoClassDefFoundError: DB/operrate_database ， 没找到类， 看看类名，引入时的路径什么的有没有错误