improve error message in case a getter is not found

Author: FrankHossfeld

gwt-editor-processor/src/main/java/org/gwtproject/editor/processor/model/EditorModel.java

@@ -111,7 +111,7 @@ private List<EditorProperty> calculateEditorData() {
         TypeMirror fieldClassType = field.asType();
         if (shouldExamine(fieldClassType)) {
           List<EditorProperty> data =
-              new EditorProperty.Builder(editorTypes, dataType)
+              new EditorProperty.Builder(editorTypes, dataType, editorType)
                   .access(field)
                   .build(Optional.ofNullable(editorSoFar));
           accumulateEditorData(data, flatData, toReturn);
@@ -145,7 +145,7 @@ private List<EditorProperty> calculateEditorData() {
           }
 
           List<EditorProperty> data =
-              new EditorProperty.Builder(editorTypes, dataType)
+              new EditorProperty.Builder(editorTypes, dataType, editorType)
                   .access(method)
                   .build(Optional.ofNullable(editorSoFar));
           accumulateEditorData(data, flatData, toReturn);
@@ -162,7 +162,7 @@ private List<EditorProperty> calculateEditorData() {
               .get(2);
 
       EditorProperty subEditor =
-          new EditorProperty.Builder(editorTypes, dataType)
+          new EditorProperty.Builder(editorTypes, dataType, editorType)
               .root(subEditorType)
               .build(Optional.ofNullable(editorSoFar))
               .get(0); // doesn't matter which instance, there must be at least one
@@ -266,7 +266,7 @@ public List<EditorProperty> getEditorData(TypeMirror editor) {
   }
 
   public EditorProperty getRootData() {
-    return new EditorProperty.Builder(editorTypes, dataType)
+    return new EditorProperty.Builder(editorTypes, dataType, editorType)
         .root(getEditorType())
         .build(Optional.empty())
         .get(0);

gwt-editor-processor/src/main/java/org/gwtproject/editor/processor/model/EditorProperty.java

@@ -17,6 +17,7 @@
 
 import com.google.auto.common.MoreElements;
 import java.util.List;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.function.Consumer;
 import java.util.regex.Pattern;
@@ -43,10 +44,12 @@ public static class Builder {
 
     private Stream.Builder<EditorProperty> builder = Stream.builder();
     private Stream<EditorProperty> stream;
+    private TypeMirror editorType;
 
-    public Builder(EditorTypes types, TypeMirror dataType) {
+    public Builder(EditorTypes types, TypeMirror dataType, TypeMirror editorType) {
       this.types = types;
       this.dataType = dataType;
+      this.editorType = editorType;
     }
 
     public Builder root(TypeMirror type) {
@@ -237,8 +240,16 @@ private void findBeanPropertyMethods(String path, TypeMirror propertyType) {
         if (!foundGetterForPart) {
           //        poison(noGetterMessage(path, proxyType));
           //          return;
-          throw new IllegalStateException(
-              "generation aborted! No getter exists for >>" + path + "<<");
+          String message =
+              "gwt-editor ==> generation aborted! No getter exists for >>"
+                  + path
+                  + "<< of owner >>"
+                  + owner.toString()
+                  + "<<";
+          if (Objects.nonNull(this.editorType)) {
+            message += " in editor >>" + this.editorType + "<<";
+          }
+          throw new IllegalStateException(message);
         }
       }
 
@@ -308,7 +319,7 @@ public List<EditorProperty> build(Optional<EditorProperty> parent) {
                                 property.editorType)
                             .get(2);
                     property.composedData =
-                        new Builder(types, dataType)
+                        new Builder(types, dataType, editorType)
                             .root(subEditorType)
                             .build(Optional.of(property))
                             .get(0);