您好，struts升价到2.5.30，项目启动后，前端跳转后台获取验证码，在filter中报了空指针，看您在这个问题下回复了已解决，想问下是怎么解决的，一直没找到解决方法，感谢。
```java
ERROR DefaultDispatcherErrorHandler Exception occurred during processing request: null
java.lang.NullPointerException
at com.opensymphony.xwork2.validator.DelegatingValidatorContext.makeTextProvider(DelegatingValidatorContext.java:212)
at com.opensymphony.xwork2.validator.DelegatingValidatorContext.(DelegatingValidatorContext.java:65)
at com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.validate(AnnotationActionValidatorManager.java:127)
at com.opensymphony.xwork2.validator.AnnotationActionValidatorManager.validate(AnnotationActionValidatorManager.java:123)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doBeforeInvocation(ValidationInterceptor.java:227)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:262)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:49)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.doIntercept(ConversionErrorInterceptor.java:142)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:137)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
```
我也是这个问题，您解决了吗？
我可以帮你们解决一下这个问题