做WEB项目，TOMCAT报错了

2011-3-29 20:35:35 org.apache.catalina.startup.Catalina start
信息: Server startup in 2281 ms
all
2011-3-29 20:35:39 com.opensymphony.xwork2.validator.ActionValidatorManagerFacto
ry
信息: Detected AnnotationActionValidatorManager, initializing it...
java.lang.ClassCastException: java.lang.String cannot be cast to [B
at wyy.DBUtil.getIndexContent(DBUtil.java:37)
at wyy.IndexAction.execute(IndexAction.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultA
ctionInvocation.java:404)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(Defa
ultActionInvocation.java:267)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:229)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doInte
rcept(DefaultWorkflowInterceptor.java:221)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept
(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(V
alidationInterceptor.java:150)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterce
ptor.doIntercept(AnnotationValidationInterceptor.java:48)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept
(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.interc
ept(ConversionErrorInterceptor.java:123)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept
(ParametersInterceptor.java:167)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept
(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.inter
cept(StaticParametersInterceptor.java:105)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(Checkbox
Interceptor.java:83)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUp
loadInterceptor.java:207)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(
ModelDrivenInterceptor.java:74)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.inte
rcept(ScopedModelDrivenInterceptor.java:127)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at org.apache.struts2.interceptor.ProfilingActivationInterceptor.interce
pt(ProfilingActivationInterceptor.java:107)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.interce
pt(DebuggingInterceptor.java:206)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(Cha
iningInterceptor.java:115)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInt
erceptor.java:143)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(Pr
epareInterceptor.java:121)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept
(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(Ser
vletConfigInterceptor.java:170)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasI
nterceptor.java:123)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.inter
cept(ExceptionMappingInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.j
ava:50)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.jav
a:504)
at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatc
her.java:419)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44
5)
at java.lang.Thread.run(Unknown Source)

java.lang.ClassCastException: java.lang.String cannot be cast to [B
at wyy.DBUtil.getIndexContent(DBUtil.java:37)
at wyy.IndexAction.execute(IndexAction.java:58)

包中的类得这行wyy.DBUtil.getIndexContent(DBUtil.java:37) 类型转换错误！

java.lang.ClassCastException: java.lang.String cannot be cast to [B
at wyy.DBUtil.getIndexContent(DBUtil.java:37)
at wyy.IndexAction.execute(IndexAction.java:58)
类型转换错误！

贴下代码吧

感觉这种问题一般都是JAR包冲突导致