[JENA-1129] NullPointerException in Query Transformation

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Jena 3.1.0
• Fix Version/s: Jena 3.1.0
• Component/s: ARQ
• Assignee: Andy Seaborne
• Reporter: Holger Knublauch
• Created: 04/Feb/16 06:24
• Updated: 14/May/16 09:51
• Resolved: 06/Feb/16 16:13

Description

Query query = QueryFactory.create(
		  " ASK { "
		+ "		FILTER NOT EXISTS {"
		+ "			BIND (?width * ?height AS ?value)"
		+ "		}"
		+ "	}");
QueryTransformOps.transform(query, new HashMap<Var,Node>());

->

java.lang.NullPointerException
	at org.apache.jena.sparql.expr.ExprVar.apply(ExprVar.java:92)
	at org.apache.jena.sparql.expr.ExprTransformer$ApplyExprTransformVisitor.visit(ExprTransformer.java:176)
	at org.apache.jena.sparql.expr.ExprVar.visit(ExprVar.java:90)
	at org.apache.jena.sparql.expr.ExprWalker$Walker.visit(ExprWalker.java:97)
	at org.apache.jena.sparql.expr.ExprWalker$WalkerBottomUp.visit(ExprWalker.java:113)
	at org.apache.jena.sparql.expr.ExprVar.visit(ExprVar.java:90)
	at org.apache.jena.sparql.expr.ExprWalker$Walker.visitExprFunction(ExprWalker.java:68)
	at org.apache.jena.sparql.expr.ExprVisitorFunction.visit(ExprVisitorFunction.java:29)
	at org.apache.jena.sparql.expr.ExprFunction2.visit(ExprFunction2.java:109)
	at org.apache.jena.sparql.expr.ExprWalker.walk(ExprWalker.java:36)
	at org.apache.jena.sparql.expr.ExprTransformer.transformation(ExprTransformer.java:62)
	at org.apache.jena.sparql.expr.ExprTransformer.transformation(ExprTransformer.java:45)
	at org.apache.jena.sparql.expr.ExprTransformer.transform(ExprTransformer.java:36)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer$ApplyTransformVisitor.visit(ElementTransformer.java:159)
	at org.apache.jena.sparql.syntax.ElementWalker$Walker.visit(ElementWalker.java:100)
	at org.apache.jena.sparql.syntax.ElementBind.visit(ElementBind.java:68)
	at org.apache.jena.sparql.syntax.ElementWalker$Walker.visit(ElementWalker.java:127)
	at org.apache.jena.sparql.syntax.ElementGroup.visit(ElementGroup.java:120)
	at org.apache.jena.sparql.syntax.ElementWalker.walk(ElementWalker.java:39)
	at org.apache.jena.sparql.syntax.ElementWalker.walk(ElementWalker.java:33)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.applyTransformation(ElementTransformer.java:89)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:83)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:74)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transform(ElementTransformer.java:66)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transform(ElementTransformer.java:56)
	at org.apache.jena.sparql.syntax.syntaxtransform.ExprTransformNodeElement.transform(ExprTransformNodeElement.java:67)
	at org.apache.jena.sparql.expr.ExprFunctionOp.apply(ExprFunctionOp.java:98)
	at org.apache.jena.sparql.expr.ExprTransformer$ApplyExprTransformVisitor.visit(ExprTransformer.java:161)
	at org.apache.jena.sparql.expr.ExprFunctionOp.visit(ExprFunctionOp.java:97)
	at org.apache.jena.sparql.expr.ExprWalker$Walker.visit(ExprWalker.java:92)
	at org.apache.jena.sparql.expr.ExprWalker$WalkerBottomUp.visit(ExprWalker.java:113)
	at org.apache.jena.sparql.expr.ExprFunctionOp.visit(ExprFunctionOp.java:97)
	at org.apache.jena.sparql.expr.ExprWalker.walk(ExprWalker.java:36)
	at org.apache.jena.sparql.expr.ExprTransformer.transformation(ExprTransformer.java:62)
	at org.apache.jena.sparql.expr.ExprTransformer.transformation(ExprTransformer.java:45)
	at org.apache.jena.sparql.expr.ExprTransformer.transform(ExprTransformer.java:36)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer$ApplyTransformVisitor.transformExpr(ElementTransformer.java:286)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer$ApplyTransformVisitor.visit(ElementTransformer.java:139)
	at org.apache.jena.sparql.syntax.ElementWalker$Walker.visit(ElementWalker.java:84)
	at org.apache.jena.sparql.syntax.ElementFilter.visit(ElementFilter.java:35)
	at org.apache.jena.sparql.syntax.ElementWalker$Walker.visit(ElementWalker.java:127)
	at org.apache.jena.sparql.syntax.ElementGroup.visit(ElementGroup.java:120)
	at org.apache.jena.sparql.syntax.ElementWalker.walk(ElementWalker.java:39)
	at org.apache.jena.sparql.syntax.ElementWalker.walk(ElementWalker.java:33)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.applyTransformation(ElementTransformer.java:89)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:83)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transformation(ElementTransformer.java:74)
	at org.apache.jena.sparql.syntax.syntaxtransform.ElementTransformer.transform(ElementTransformer.java:61)
	at org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps.transform(QueryTransformOps.java:57)
	at org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps.transform(QueryTransformOps.java:46)