[java] Report class name for package-private only classes

- Fixes #1729

pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/JavaRuleViolation.java

@@ -119,6 +119,19 @@ public class JavaRuleViolation extends ParametricRuleViolation<JavaNode> {
                     }
                 }
             }
+            
+            // Still not found?
+            if (qualifiedName == null) {
+                for (ClassNameDeclaration c : classes) {
+                    // find the first package-private class/enum declaration
+                    if (c.getAccessNodeParent() instanceof AccessNode) {
+                        if (((AccessNode) c.getAccessNodeParent()).isPackagePrivate()) {
+                            qualifiedName = c.getImage();
+                            break;
+                        }
+                    }
+                }
+            }
         }
 
         if (qualifiedName != null) {

pmd-java/src/test/java/net/sourceforge/pmd/lang/java/rule/JavaRuleViolationTest.java

@@ -120,4 +120,14 @@ public class JavaRuleViolationTest {
         assertEquals("pkg", violation.getPackageName());
         assertEquals("Bar", violation.getClassName());
     }
+    
+    @Test
+    public void testPackageAndPackagePrivateClassesName() {
+        ASTCompilationUnit ast = parse("package pkg; import java.util.List; class Foo { }");
+        ASTImportDeclaration importNode = ast.getFirstDescendantOfType(ASTImportDeclaration.class);
+
+        JavaRuleViolation violation = new JavaRuleViolation(null, new RuleContext(), importNode, null);
+        assertEquals("pkg", violation.getPackageName());
+        assertEquals("Foo", violation.getClassName());
+    }
 }