stefli opened a new issue #1637: Issue about the provider side parameter validation URL: https://github.com/apache/incubator-dubbo/issues/1637 **Background** We use JSR303 validation protocol, and use hibernate as implementation of JSR303 protocol. **Problem Description** Recently, we want to use the validation on the provider side(No issue on the consumer side). But we can't get the validation errors on the consumer side after configured the validation="true" to the service on the provider side. We try to use the ExceptionHandler to parse the exception returned,but we can't get the validation errors. The exception returned is RpcException with RemotingException clause, but we need RpcException with ConstraintViolationException clause. Because we can get the failed property name and the validation error from ConstraintViolationException directly. We have analysised the ValidationFilter, it throws new RpcException when validation failed. And the exception will be wrapped with RemotingException when result status is not equal to OK and SERVER_TIMEOUT in another class. The recent version of ValidationFilter has been upgrade to return RpcResult, but it seems not completely. **Candidate Solution** To fix this issue, we add two more files to wrap the property name and validation error from the hibernate validator, and return to client. The code snippet: ` Set<CustomConstraintViolation> set = rewriteFromConstraintViolationException(); return new RpcResult(new RpcException(new CustomConstraintViolationException(set))); // Replace javax.validation.ConstraintViolation with CustomConstraintViolation // Replace javax.validation.ConstraintViolationException with CustomConstraintViolationException ` We have tried to return javax.validation.ConstraintViolationException directly, but failed with ConstraintDescriptorImpl deserialization. Because the ConstraintDescriptorImpl has no empty constructor and can't be instantiated when deserialization. So create above two custom classes to rewrite the exception. Then the ExceptionHandler can handle the RpcException, and retrieve the property name & validation error from CustomConstraintViolationException.
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