#236: Do not register problems on mapping composition annotations

src/main/java/org/mapstruct/intellij/inspection/MapstructReferenceInspection.java

@@ -9,10 +9,12 @@
 import com.intellij.codeInspection.ProblemsHolder;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.psi.ContributedReferenceHost;
+import com.intellij.psi.PsiClass;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiElementVisitor;
 import com.intellij.psi.PsiLanguageInjectionHost;
 import com.intellij.psi.PsiReference;
+import com.intellij.psi.util.PsiTreeUtil;
 import org.jetbrains.annotations.NotNull;
 import org.mapstruct.intellij.codeinsight.references.BaseReference;
 import org.mapstruct.intellij.codeinsight.references.BaseValueMappingReference;
@@ -64,7 +66,19 @@ private boolean shouldRegisterProblem(BaseReference reference) {
             if ( reference instanceof BaseValueMappingReference valueMappingReference ) {
                 return valueMappingReference.getEnumClass() != null;
             }
-            return true;
+
+            return !containingClassIsAnnotationType( reference.getElement() );
+        }
+
+        private boolean containingClassIsAnnotationType(PsiElement element) {
+
+            PsiClass containingClass = PsiTreeUtil.getParentOfType( element, PsiClass.class );
+
+            if ( containingClass == null ) {
+                return false;
+            }
+
+            return containingClass.isAnnotationType();
         }
     }
 }

src/test/java/org/mapstruct/intellij/bugs/_236/DisableSourceAndTargetPropertyInspectionOnAnnotationsTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at https://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.intellij.bugs._236;
+
+import org.jetbrains.annotations.NotNull;
+import org.mapstruct.intellij.inspection.BaseInspectionTest;
+import org.mapstruct.intellij.inspection.MapstructReferenceInspection;
+
+/**
+ * @author Oliver Erhart
+ */
+public class DisableSourceAndTargetPropertyInspectionOnAnnotationsTest extends BaseInspectionTest {
+
+    @Override
+    protected String getTestDataPath() {
+        return "testData/bugs/_236";
+    }
+
+    @NotNull
+    @Override
+    protected Class<MapstructReferenceInspection> getInspection() {
+        return MapstructReferenceInspection.class;
+    }
+
+    public void testDisableSourceAndTargetPropertyInspectionOnAnnotations() {
+        doTest();
+    }
+}

testData/bugs/_236/DisableSourceAndTargetPropertyInspectionOnAnnotations.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at https://www.apache.org/licenses/LICENSE-2.0
+ */
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import org.mapstruct.Mapping;
+import org.mapstruct.Mappings;
+
+@Retention(RetentionPolicy.CLASS)
+@Mapping(target = "id", ignore = true)
+@Mapping(target = "creationDate", expression = "java(new java.util.Date())")
+@Mapping(target = "name", source = "groupName")
+@interface ToEntity { }
+
+@Retention(RetentionPolicy.CLASS)
+@Mappings({
+    @Mapping(target = "id", ignore = true),
+    @Mapping(target = "creationDate", expression = "java(new java.util.Date())"),
+    @Mapping(target = "name", source = "groupName")
+})
+@interface ToEntityWithMappings { }
+