Fix handle binding to illegal parameter type.

Author: raphw

byte-buddy-dep/src/main/java/net/bytebuddy/implementation/bind/annotation/Handle.java

@@ -149,7 +149,7 @@ public MethodDelegationBinder.ParameterBinding<?> bind(AnnotationDescription.Loa
                                                                Assigner assigner,
                                                                Assigner.Typing typing) {
             if (!target.getType().asErasure().isAssignableFrom(JavaType.METHOD_HANDLE.getTypeStub())) {
-                return MethodDelegationBinder.ParameterBinding.Illegal.INSTANCE;
+                throw new IllegalStateException("Cannot assign " + target + " to " + JavaType.METHOD_HANDLE.getTypeStub());
             }
             TypeDescription owner = annotation.getValue(HANDLE_OWNER).resolve(TypeDescription.class);
             return new MethodDelegationBinder.ParameterBinding.Anonymous(new JavaConstantValue(new JavaConstant.MethodHandle(

byte-buddy-dep/src/test/java/net/bytebuddy/implementation/bind/annotation/HandleBinderTest.java

@@ -63,11 +63,9 @@ public void testAssignableBinding() throws Exception {
         assertThat(parameterBinding.isValid(), is(true));
     }
 
-    @Test
+    @Test(expected = IllegalStateException.class)
     public void testNonAssignableBinding() throws Exception {
         when(targetType.isAssignableFrom(JavaType.METHOD_HANDLE.getTypeStub())).thenReturn(false);
-        MethodDelegationBinder.ParameterBinding<?> parameterBinding = Handle.Binder.INSTANCE
-                .bind(annotationDescription, source, target, implementationTarget, assigner, Assigner.Typing.STATIC);
-        assertThat(parameterBinding.isValid(), is(false));
+        Handle.Binder.INSTANCE.bind(annotationDescription, source, target, implementationTarget, assigner, Assigner.Typing.STATIC);
     }
 }