HV-1220 Make programmatically defined cross parameter constraints on the parameters of a method returning void work as expected

The location used was the one of a return value so it kinda worked if the
method had parameters as the return value type was Object which is
supported for cross parameter constraints but it failed as long as the
return value type was void.

Author: gsmet

engine/src/main/java/org/hibernate/validator/internal/cfg/context/ConfiguredConstraint.java

@@ -59,12 +59,18 @@ public static <A extends Annotation> ConfiguredConstraint<A> forParameter(Constr
 		);
 	}
 
-	public static <A extends Annotation> ConfiguredConstraint<A> forExecutable(ConstraintDef<?, A> constraint, ExecutableElement executable) {
+	public static <A extends Annotation> ConfiguredConstraint<A> forReturnValue(ConstraintDef<?, A> constraint, ExecutableElement executable) {
 		return new ConfiguredConstraint<A>(
 				constraint, ConstraintLocation.forReturnValue( executable ), executable.getElementType()
 		);
 	}
 
+	public static <A extends Annotation> ConfiguredConstraint<A> forCrossParameter(ConstraintDef<?, A> constraint, ExecutableElement executable) {
+		return new ConfiguredConstraint<A>(
+				constraint, ConstraintLocation.forCrossParameter( executable ), executable.getElementType()
+		);
+	}
+
 	public ConstraintDef<?, A> getConstraint() {
 		return constraint;
 	}

engine/src/main/java/org/hibernate/validator/internal/cfg/context/CrossParameterConstraintMappingContextImpl.java

@@ -32,7 +32,7 @@ final class CrossParameterConstraintMappingContextImpl
 
 	@Override
 	public CrossParameterConstraintMappingContext constraint(ConstraintDef<?, ?> definition) {
-		super.addConstraint( ConfiguredConstraint.forExecutable( definition, executableContext.getExecutable() ) );
+		super.addConstraint( ConfiguredConstraint.forCrossParameter( definition, executableContext.getExecutable() ) );
 		return this;
 	}
 

engine/src/main/java/org/hibernate/validator/internal/cfg/context/PropertyConstraintMappingContextImpl.java

@@ -62,7 +62,7 @@ public PropertyConstraintMappingContext constraint(ConstraintDef<?, ?> definitio
 		}
 		else {
 			super.addConstraint(
-					ConfiguredConstraint.forExecutable(
+					ConfiguredConstraint.forReturnValue(
 							definition, ExecutableElement.forMethod( (Method) member )
 					)
 			);

engine/src/main/java/org/hibernate/validator/internal/cfg/context/ReturnValueConstraintMappingContextImpl.java

@@ -39,7 +39,7 @@ protected ReturnValueConstraintMappingContext getThis() {
 
 	@Override
 	public ReturnValueConstraintMappingContext constraint(ConstraintDef<?, ?> definition) {
-		super.addConstraint( ConfiguredConstraint.forExecutable( definition, executableContext.getExecutable() ) );
+		super.addConstraint( ConfiguredConstraint.forReturnValue( definition, executableContext.getExecutable() ) );
 		return this;
 	}
 

engine/src/test/java/org/hibernate/validator/test/cfg/MethodConstraintMappingTest.java

@@ -666,6 +666,38 @@ public void crossParameterConstraint() {
 		}
 	}
 
+	@Test
+	@TestForIssue(jiraKey = "HV-1220")
+	public void crossParameterConstraintOnMethodReturningVoid() {
+		ConstraintMapping mapping = config.createConstraintMapping();
+		mapping.type( GreetingService.class )
+				.method( "sayNothing", String.class )
+				.crossParameter()
+				.constraint(
+						new GenericConstraintDef<GenericAndCrossParameterConstraint>(
+								GenericAndCrossParameterConstraint.class
+						)
+				);
+		config.addMapping( mapping );
+
+		try {
+			GreetingService service = getValidatingProxy(
+					wrappedObject,
+					config.buildValidatorFactory().getValidator()
+			);
+			service.sayNothing( "" );
+
+			fail( "Expected exception wasn't thrown." );
+		}
+		catch (ConstraintViolationException e) {
+
+			assertCorrectConstraintViolationMessages(
+					e, "default message"
+			);
+			assertCorrectPropertyPaths( e, "sayNothing.<cross-parameter>" );
+		}
+	}
+
 	private interface TestGroup {
 	}
 
@@ -708,6 +740,8 @@ public interface GreetingService {
 
 		User getUser();
 
+		void sayNothing(String string1);
+
 	}
 
 	public class GreetingServiceImpl implements GreetingService {
@@ -747,5 +781,10 @@ public Message getHello() {
 		public User getUser() {
 			return new User( null );
 		}
+
+		@Override
+		public void sayNothing(String string1) {
+			// Nothing to do
+		}
 	}
 }