Struts 2 + Xwork validation problems

[Art Krahenbuhl <ar...@wingateweb.com>]

We recently migrated our project over from WebWork to Struts 2.  The move was
fairly painless, however, there is one issue that is plaguing us.  Whenever
it seems that we use a *-validation.xml file to do our validation, it
doesn't complete and throws a large stack trace.  I'll attach a snippet of
the trace (and I can provide the entire stack trace if needed).  The error
comes up as either an ExceptionInInitializerError or a NoClassDefFoundError
(we've gotten both consistently).  Granted all of these problems go away if
we use just the validate() method, but we had all validation working in
WebWork - any help on this strange issue would be appreciated.

In regards to the NoClassDefFoundError, the class that can't be found isn't
specified.  Perhaps I'm not including a required jar, but I'm not sure what
jar could be missing.


StackTrace:

java.lang.ExceptionInInitializerError

com.opensymphony.xwork2.validator.ValidatorFileParser.addValidatorConfigs(ValidatorFileParser.java:192)

com.opensymphony.xwork2.validator.ValidatorFileParser.parseActionValidatorConfigs(ValidatorFileParser.java:72)

com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.loadFile(AnnotationActionValidatorManager.java:361)

com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.buildClassValidatorConfigs(AnnotationActionValidatorManager.java:252)

com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.buildValidatorConfigs(AnnotationActionValidatorManager.java:340)

com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.getValidators(AnnotationActionValidatorManager.java:69)

com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.validate(AnnotationActionValidatorManager.java:138)

com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.validate(AnnotationActionValidatorManager.java:113)

com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.validate(AnnotationActionValidatorManager.java:100)

com.opensymphony.xwork2.validator.ValidationInterceptor.doBeforeInvocation(ValidationInterceptor.java:142)

com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:148)

org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48)

com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)

com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)

com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)

com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)

com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
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