HHH-19759 - Avoid a ClassCastException when joining on a basic value type

Signed-off-by: Jan Schatteman <[email protected]>

Author: jrenaat

hibernate-core/src/main/java/org/hibernate/query/hql/internal/QualifiedJoinPathConsumer.java

@@ -212,6 +212,10 @@ else if ( fetch ) {
 				}
 			}
 		}
+		if ( !(subPathSource instanceof SqmJoinable) ) {
+			throw new SemanticException( "Joining on basic value elements is not supported",
+					((SemanticQueryBuilder<?>) creationState).getQuery() );
+		}
 		@SuppressWarnings("unchecked")
 		final SqmJoinable<U, ?> joinSource = (SqmJoinable<U, ?>) subPathSource;
 		return createJoin( lhs, joinType, alias, fetch, isTerminal, allowReuse, creationState, joinSource );

hibernate-core/src/main/java/org/hibernate/query/hql/internal/SemanticQueryBuilder.java

@@ -436,6 +436,10 @@ public Stack<SqmCreationProcessingState> getProcessingStateStack() {
 		return processingStateStack;
 	}
 
+	public String getQuery() {
+		return query;
+	}
+
 	// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 	// Grammar rules