When performing constraint checking using

               // Run all constraints
                List<ConstraintViolation> cvs = SPINConstraints.check(model, 
null);
                System.out.println("Constraint violations:");
                for(ConstraintViolation cv : cvs) {
                        System.out.println(" - at " +
SPINLabels.get().getLabel(cv.getRoot()) + ": " + cv.getMessage());
                }

I get the following error:

java.lang.IllegalArgumentException: Function 
http://topbraid.org/sparqlmotionfunctions#deriveURI
does not define a valid body
        at org.topbraid.spin.arq.SPINARQFunction.<init>(SPINARQFunction.java:
71)
        at
org.topbraid.spin.arq.SPINBodyFunctionDriver.doCreate(SPINBodyFunctionDriver.java:
21)
        at
org.topbraid.spin.arq.SPINFunctionDrivers.create(SPINFunctionDrivers.java:
31)
        at
org.topbraid.spin.system.SPINModuleRegistry.registerARQFunction(SPINModuleRegistry.java:
222)
        at
org.topbraid.spin.system.SPINModuleRegistry.register(SPINModuleRegistry.java:
176)
        at
org.topbraid.spin.system.SPINModuleRegistry.registerFunctions(SPINModuleRegistry.java:
258)
        at
org.topbraid.spin.system.SPINModuleRegistry.registerAll(SPINModuleRegistry.java:
207)
        at
org.topbraid.spin.system.SPINImports.getImportsModel(SPINImports.java:
120)
        at
org.topbraid.spin.constraints.SPINConstraints.run(SPINConstraints.java:
441)
        at
org.topbraid.spin.constraints.SPINConstraints.check(SPINConstraints.java:
313)
        at
org.topbraid.spin.constraints.SPINConstraints.check(SPINConstraints.java:
297)
        at
eu.sofia.adk.sib.model.semantic.SemanticModel.query(SemanticModel.java:
484)
        at
eu.sofia.adk.sib.model.request.QueryRequest.processRequest(QueryRequest.java:
135)
        at eu.sofia.adk.sib.model.request.Request.run(Request.java:94)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:
441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor
$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor
$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NumberFormatException: For input string: ""
        at
java.lang.NumberFormatException.forInputString(NumberFormatException.java:
48)
        at java.lang.Integer.parseInt(Integer.java:470)
        at java.lang.Integer.valueOf(Integer.java:554)
        at
org.topbraid.spin.model.impl.FunctionCallImpl.getArgumentProperties(FunctionCallImpl.java:
64)
        at
org.topbraid.spin.model.impl.FunctionCallImpl.getArguments(FunctionCallImpl.java:
49)
        at
org.topbraid.spin.model.impl.FunctionCallImpl.print(FunctionCallImpl.java:
172)
        at
org.topbraid.spin.util.SPINExpressions.printExpressionString(SPINExpressions.java:
189)
        at
org.topbraid.spin.model.impl.AbstractSPINResourceImpl.printNestedExpressionString(AbstractSPINResourceImpl.java:
146)
        at
org.topbraid.spin.model.impl.AbstractSPINResourceImpl.printNestedExpressionString(AbstractSPINResourceImpl.java:
141)
        at org.topbraid.spin.model.impl.BindImpl.print(BindImpl.java:54)
        at
org.topbraid.spin.model.impl.ElementListImpl.print(ElementListImpl.java:
139)
        at
org.topbraid.spin.model.impl.AbstractSPINResourceImpl.printNestedElementList(AbstractSPINResourceImpl.java:
132)
        at org.topbraid.spin.model.impl.QueryImpl.printWhere(QueryImpl.java:
177)
        at org.topbraid.spin.model.impl.SelectImpl.print(SelectImpl.java:99)
        at
org.topbraid.spin.model.impl.AbstractSPINResourceImpl.toString(AbstractSPINResourceImpl.java:
183)
        at org.topbraid.spin.arq.SPINARQFunction.<init>(SPINARQFunction.java:
58)
        ... 19 more

I am using SPIN 1.2.0, ARQ 2.8.7 and Jena 2.6.4.

Regards,
Gerrit

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