add throwing an exception

Author: pfichtner

jmolecules-bytebuddy-tests/jmolecules-bytebuddy-tests-vaadoo/src/test/java/org/jmolecules/bytebuddy/JMoleculesVaadooPluginTests.java

@@ -16,8 +16,7 @@
 package org.jmolecules.bytebuddy;
 
 import static org.assertj.core.api.Assertions.assertThat;
-
-import java.util.Arrays;
+import static org.assertj.core.api.Assertions.assertThatRuntimeException;
 
 import org.junit.jupiter.api.Test;
 
@@ -27,10 +26,13 @@ class JMoleculesVaadooPluginTests {
 
 	@Test
 	void defaultsForSampleValueObject() throws Exception {
-		new SampleValueObject("test");
-		System.out.println(Arrays.toString(SampleValueObject.class.getMethods()));
-		System.out.println(Arrays.toString(SampleValueObject.class.getDeclaredMethods()));
 		assertThat(SampleValueObject.class.getDeclaredMethod("__vaadoo$validate")).isNotNull();
 	}
 
+	@Test
+	void createInstance() throws Exception {
+		assertThatRuntimeException().isThrownBy(() -> new SampleValueObject("test"))
+				.withMessage("Vaadoo validation failed: override or disable this method");
+	}
+
 }

jmolecules-bytebuddy/src/main/java/org/jmolecules/bytebuddy/VaadooImplementor.java

@@ -10,6 +10,7 @@
 
 import net.bytebuddy.description.method.MethodDescription.InDefinedShape;
 import net.bytebuddy.dynamic.DynamicType.Builder;
+import net.bytebuddy.implementation.ExceptionMethod;
 import net.bytebuddy.implementation.MethodCall;
 import net.bytebuddy.implementation.StubMethod;
 import net.bytebuddy.implementation.SuperMethodCall;
@@ -42,7 +43,14 @@ private static boolean isValidateMethod(InDefinedShape target, String methodName
 	}
 
 	private Builder<?> addValidationMethod(Builder<?> builder, String methodName) {
-		return builder.defineMethod(methodName, void.class).intercept(StubMethod.INSTANCE);
+	    return builder
+	        .defineMethod(methodName, void.class)
+	        .intercept(
+	            ExceptionMethod.throwing(
+	                IllegalStateException.class,
+	                "Vaadoo validation failed: override or disable this method"
+	            )
+	        );
 	}
 
 	private Builder<?> injectValidationIntoConstructors(Builder<?> builder, String methodName) {