Exception in thread "AWT-EventQueue-0" com.hp.hpl.jena.query.QueryBuildException: Can't instantiate function for java:project.haschild
at com.hp.hpl.jena.sparql.function.FunctionFactoryAuto.create(FunctionFactoryAuto.java:29)
at com.hp.hpl.jena.sparql.expr.E_Function.bindFunction(E_Function.java:94)
at com.hp.hpl.jena.sparql.expr.E_Function.buildFunction(E_Function.java:73)
at com.hp.hpl.jena.sparql.expr.ExprBuild.visit(ExprBuild.java:29)
at com.hp.hpl.jena.sparql.expr.ExprFunctionN.visit(ExprFunctionN.java:109)
at com.hp.hpl.jena.sparql.expr.ExprWalker$Walker.visitExprFunction(ExprWalker.java:55)
at com.hp.hpl.jena.sparql.expr.ExprVisitorFunction.visit(ExprVisitorFunction.java:15)
at com.hp.hpl.jena.sparql.expr.ExprFunctionN.visit(ExprFunctionN.java:109)
at com.hp.hpl.jena.sparql.expr.ExprWalker.walk(ExprWalker.java:22)
at com.hp.hpl.jena.sparql.expr.ExprList.prepareExprs(ExprList.java:86)
at com.hp.hpl.jena.sparql.algebra.optimize.OpVisitorExprPrepare.visit(OpVisitorExprPrepare.java:24)
at com.hp.hpl.jena.sparql.algebra.op.OpFilter.visit(OpFilter.java:96)
at com.hp.hpl.jena.sparql.algebra.OpWalker$WalkerVisitor.visit1(OpWalker.java:85)
at com.hp.hpl.jena.sparql.algebra.OpVisitorByType.visit(OpVisitorByType.java:71)
at com.hp.hpl.jena.sparql.algebra.op.OpFilter.visit(OpFilter.java:96)
at com.hp.hpl.jena.sparql.algebra.OpWalker.walk(OpWalker.java:35)
at com.hp.hpl.jena.sparql.algebra.OpWalker.walk(OpWalker.java:25)
at com.hp.hpl.jena.sparql.algebra.optimize.Optimize.rewrite(Optimize.java:138)
at com.hp.hpl.jena.sparql.algebra.optimize.Optimize.optimize(Optimize.java:67)
at com.hp.hpl.jena.sparql.algebra.Algebra.optimize(Algebra.java:53)
at com.hp.hpl.jena.sparql.engine.main.QueryEngineMain.modifyOp(QueryEngineMain.java:72)
at com.hp.hpl.jena.sparql.engine.QueryEngineBase.createPlan(QueryEngineBase.java:104)
at com.hp.hpl.jena.sparql.engine.QueryEngineBase.getPlan(QueryEngineBase.java:97)
at com.hp.hpl.jena.sparql.engine.main.QueryEngineMain$1.create(QueryEngineMain.java:91)
at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.getPlan(QueryExecutionBase.java:426)
at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.startQueryIterator(QueryExecutionBase.java:400)
at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execResultSet(QueryExecutionBase.java:408)
at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execSelect(QueryExecutionBase.java:135)
at project.frame$2.actionPerformed(frame.java:138)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.InstantiationException
at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.hp.hpl.jena.sparql.function.FunctionFactoryAuto.create(FunctionFactoryAuto.java:26)
... 65 more
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