Struts+hibernate整合问题！java.lang.reflect.InvocationTargetException
我没什么分，各位大牛请见谅！
Struts、hibernate单独测试ok ，一整合就出现错误！
jar包如下：
hibernate
  |--antlr-2.7.6.jar
  |--commons-collections-3.1.jar
  |--dom4j-1.6.1jar
  |--jta-1.1.jar
  |--slf4j-nop-1.6.4.jar
  |--slf4j-api-1.6.4.jar
  |--hibernate3.jar
Web App Libraries(这里是struts的jar包)
  |--asm-3.1.jar
  |--asm-commons-3.1.jar
  |--asm-tree-3.1.jar
  |--commons-fileupload-1.2.2.jar
  |--commons-io-2.0.1.jar
  |--commons-lang-2.5.jar
  |--freemarker-2.3.16.jar
  |--javassist-3.11.0.GA.jar
  |--ognl-3.0.1.jar
  |--struts2-core-2.2.3.1.jar
  |--xwork-core-2.2.3.1.jar


运行时出现以下信息：

Stacktraces

java.lang.reflect.InvocationTargetException
  sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  java.lang.reflect.Method.invoke(Method.java:592)
  com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
  com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
  com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
  com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
  org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
  com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
  com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
  com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
  ......（信息太长，这里省略了一些！）
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
  org