Better error message.

git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@632412 13f79535-47bb-0310-9956-ffa450edef68

openjpa-kernel/src/main/java/org/apache/openjpa/kernel/jpql/JPQLExpressionBuilder.java

@@ -1355,8 +1355,8 @@ public class JPQLExpressionBuilder
         else if (val.getMetaData() != null)
             path = newPath(val, val.getMetaData());
         else
-            throw parseException(EX_USER, "path-no-meta",
+            throw parseException(EX_USER, "path-invalid",
-                new Object[]{ assemble(node), null }, null);
+                new Object[]{ assemble(node), name }, null);
 
         // walk through the children and assemble the path
         boolean allowNull = !inner;

openjpa-kernel/src/main/resources/org/apache/openjpa/kernel/jpql/localizer.properties

@@ -45,6 +45,9 @@ unknown-type: Cannot determine the type of field "{0}".
 unexpected-var: The variable "{0}" was found where a constant or \
 	field value was expected.
 path-no-meta: Attempt to query field "{0}" from non-entity class "{1}".
+path-invalid: Attempt to query field "{0}" from non-entity variable "{1}". \
+    Perhaps you forgot to prefix the path in question with an identification \
+    variable from your FROM clause?
 not-yet-supported: Expressions of type "{0}" are not yet supported.
 bad-positional-parameter: The positional parameter "{0}" is invalid. \
 	Positional parameters must be integers greater than zero.

openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/query/TestJPQLWithoutIdentificationVariable.java

@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.openjpa.persistence.query;
+
+import javax.persistence.Query;
+
+import org.apache.openjpa.persistence.test.SingleEMTestCase;
+
+public class TestJPQLWithoutIdentificationVariable extends SingleEMTestCase {
+
+    public void setUp() {
+        setUp(ManyOneEntity.class, ManyOneEntitySub.class);
+    }
+
+    public void testJPQLWithoutIdentificationVariable() {
+        try {
+            em.createQuery("select o from ManyOneEntity o " +
+                "where rel.name = :name").compile();
+        } catch (RuntimeException e) {
+            assertTrue(e.getMessage().contains(
+                "Perhaps you forgot to prefix the path"));
+        }
+    }
+}