HHH-2159 : NullPointerException in FromElement#findIntendedAliasedFromElementBasedOnCrazyJPARequirements

git-svn-id: https://svn.jboss.org/repos/hibernate/core/trunk@14050 1b8cb986-b30d-0410-93ca-fae66ebed9b2

core/src/main/java/org/hibernate/hql/ast/tree/FromClause.java

@@ -85,13 +85,14 @@ public class FromClause extends HqlSqlWalkerNode implements HqlSqlTokenTypes, Di
 	}
 
 	void addDuplicateAlias(String alias, FromElement element) {
-		fromElementByClassAlias.put( alias, element );
+		if ( alias != null ) {
+			fromElementByClassAlias.put( alias, element );
+		}
 	}
 
 	private void checkForDuplicateClassAlias(String classAlias) throws SemanticException {
 		if ( classAlias != null && fromElementByClassAlias.containsKey( classAlias ) ) {
-			throw new SemanticException( "Duplicate definition of alias '"
-					+ classAlias + "'" );
+			throw new SemanticException( "Duplicate definition of alias '" + classAlias + "'" );
 		}
 	}
 

testsuite/src/test/java/org/hibernate/test/jpa/ql/JPAQLComplianceTest.java

@@ -41,6 +41,12 @@ public class JPAQLComplianceTest extends AbstractJPATest {
 		s.close();
 	}
 
+	public void testIdentifierCasesensitivityAndDuplicateFromElements() throws Exception {
+		Session s = openSession();
+		s.createQuery( "select e from MyEntity e where exists (select 1 from MyEntity e2 where e2.other.name  = 'something' and e2.other.other = e)" );
+		s.close();
+	}
+
 	public void testGeneratedSubquery() {
 		Session s = openSession();
 		s.createQuery( "select c FROM Item c WHERE c.parts IS EMPTY" ).list();