Handling method validation exceptions - ejb-3.1

Question

i did not find any answer for question "How to handle method validation exceptions?", which is thrown automatically by Bean Validation 1.1.
I have following environment:
Glassfish 4
hibernate-validator-5.0.1.Final.jar (in ear)
Now I try to implement auto validation of method parameters:
#Local
#ValidateOnExecution(type = ExecutableType.ALL)
public interface SomeServiceLocal {
String someMethod(#Size(max = 1) String value);
}
in execution of:
#Stateless
public class OtherBean implements OtherBeanLocal {
#EJB
private SomeServiceLocal someService;
#Override
public String otherMethod() {
return someService.someMethod("abc");
}
}
}
Now, when I call otherMethod a receive:
javax.ejb.EJBTransactionRolledbackException
at com.sun.ejb.containers.BaseContainer.mapLocal3xException(BaseContainer.java:2279)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2060)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1979)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:220)
followed by
Caused by: javax.validation.ConstraintViolationException: 1 constraint violation(s) occurred during method validation
...
Constraint violations:
(1) Kind: PARAMETER
parameter index: 3
message: size must be between 0 and 1
What is a best practice to handle violation exceptions?

Answer 1

I've created cdi interceptor which handles EJBException and extract constraint violations. It works perfect:
#MyValidation
#Interceptor
public class MyValidationExceptionInterceptor implements Serializable {
private static final long serialVersionUID = -5280505156146359055L;
#AroundInvoke
public Object processViolationException(InvocationContext ctx) throws Exception {
try {
return ctx.proceed();
} catch (EJBTransactionRolledbackException e) {
Throwable throwable = e.getCause();
if (throwable != null && throwable.getCause() != null && throwable.getCause() instanceof ConstraintViolationException) {
ConstraintViolationException cve = (ConstraintViolationException) throwable.getCause();
throw new MyException(getMessage(cve));
}
throw e;
} catch (Exception e) {
throw e;
}
}
private String getMessage(ConstraintViolationException cve) {
StringBuilder builder = new StringBuilder();
for(ConstraintViolation<?> violation : cve.getConstraintViolations()) {
builder.append(violation.getMessage()).append(';');
}
return builder.toString();
}
}