Hi Phil, I don't know exactly what is the cause of the problem but I may have found a way to solve it.
Some segments of the dataset appears twice, but the polygonizer needs a clean, noded linework as input. To clean it, I used OpenJUMP - Tools > Edit Geometry > Convert > Extract Segments (option="Make double segments unique") - Tools > Edit Geometry > Convert > Polygonize It will need more time to investigate why the error occurs though as the algorithm should not produce a NullPointerException in any case. Regards, Michaël Le 26/07/2016 à 04:17, Phil Scadden a écrit : > The link > https://drive.google.com/file/d/0B3lye8EN1ELEUVphVi1HNkl2VWs/view?usp=sharing > is now working and contains the valid linear rings that I have fed into > the polygonizer. > > It crashes as before, stack trace below, but produces the same crash in > TestBuilder. > > java.lang.NullPointerException > at > com.vividsolutions.jts.algorithm.RayCrossingCounter.countSegment(RayCrossingCounter.java:134) > at > com.vividsolutions.jts.algorithm.RayCrossingCounter.locatePointInRing(RayCrossingCounter.java:80) > at > com.vividsolutions.jts.algorithm.CGAlgorithms.locatePointInRing(CGAlgorithms.java:167) > at > com.vividsolutions.jts.algorithm.CGAlgorithms.isPointInRing(CGAlgorithms.java:148) > at > com.vividsolutions.jts.operation.polygonize.EdgeRing.findEdgeRingContaining(EdgeRing.java:85) > at > com.vividsolutions.jts.operation.polygonize.Polygonizer.assignHoleToShell(Polygonizer.java:242) > at > com.vividsolutions.jts.operation.polygonize.Polygonizer.assignHolesToShells(Polygonizer.java:236) > at > com.vividsolutions.jts.operation.polygonize.Polygonizer.polygonize(Polygonizer.java:198) > at > com.vividsolutions.jts.operation.polygonize.Polygonizer.getPolygons(Polygonizer.java:143) > at nz.cri.gns.tsurfist.tsurface.assembleEdges(tsurface.java:1316) > at nz.cri.gns.tsurfist.tsurface.loadFromFile(tsurface.java:1450) > at nz.cri.gns.tsurfist.ProcessCmdLine.main(ProcessCmdLine.java:48) > at > nz.cri.gns.tsurfist.ProcessCmdLineTest.testMain(ProcessCmdLineTest.java:48) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) > at > org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) > at > org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) > at > org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) > at > org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) > at > org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30) > at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) > at > org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) > at > org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) > at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) > at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) > at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) > at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) > at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) > at > org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) > at > org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30) > at org.junit.runners.ParentRunner.run(ParentRunner.java:300) > at > org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53) > at > org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123) > at > org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164) > at > org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:110) > at > org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:175) > at > org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcessWhenForked(SurefireStarter.java:107) > at > org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:68) > ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? 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