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See GetFeatureTest#testConcurretGet, with high enough values or threads and repeats for the system at hand,
with the following trace:
{{java.lang.NullPointerException
at java.xml/com.sun.org.apache.xerces.internal.dom.ParentNode.nodeListGetLength(ParentNode.java:697)
at java.xml/com.sun.org.apache.xerces.internal.dom.ParentNode.getLength(ParentNode.java:725)
at org.geotools.xsd.impl.BindingPropertyExtractor.getSequenceElement(BindingPropertyExtractor.java:397)
at org.geotools.xsd.impl.BindingPropertyExtractor.isUnboundedSequence(BindingPropertyExtractor.java:363)
at org.geotools.xsd.impl.BindingPropertyExtractor.properties(BindingPropertyExtractor.java:82)
at org.geotools.xsd.Encoder.encode(Encoder.java:990)
at org.geotools.xsd.Encoder.encode(Encoder.java:552)
at org.geoserver.wfs.xml.GML32OutputFormat.encode(GML32OutputFormat.java:151)
at org.geoserver.wfs.xml.GML3OutputFormat.write(GML3OutputFormat.java:312)
at org.geoserver.wfs.WFSGetFeatureOutputFormat.write(WFSGetFeatureOutputFormat.java:198)
at org.geoserver.ows.Dispatcher.response(Dispatcher.java:1031)
at org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:269)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:998)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:890)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:875)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.geoserver.test.GeoServerSystemTestSupport$2.service(GeoServerSystemTestSupport.java:1654)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:166)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
at org.geoserver.test.GeoServerSystemTestSupport.dispatch(GeoServerSystemTestSupport.java:1683)
at org.geoserver.test.GeoServerSystemTestSupport.dispatch(GeoServerSystemTestSupport.java:1594)
at org.geoserver.test.GeoServerSystemTestSupport.getAsServletResponse(GeoServerSystemTestSupport.java:1049)
at org.geoserver.test.GeoServerSystemTestSupport.getAsServletResponse(GeoServerSystemTestSupport.java:1032)
at org.geoserver.test.GeoServerSystemTestSupport.get(GeoServerSystemTestSupport.java:992)
at org.geoserver.test.GeoServerSystemTestSupport.getAsDOM(GeoServerSystemTestSupport.java:1426)
at org.geoserver.test.GeoServerSystemTestSupport.getAsDOM(GeoServerSystemTestSupport.java:1274)
at org.geoserver.wfs.v2_0.GetFeatureTest.testGetFifteenAll(GetFeatureTest.java:233)
at org.geoserver.wfs.v2_0.GetFeatureTest.lambda$testConcurrentGet$0(GetFeatureTest.java:130)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)}}
Hypothesis: despite the synchronizations, the FeatureTypeSchemaBuilder is adding imports of various schemas into the schema for the output… and those changes in XSD are bilateral. However, we cannot really stop and wait for the entire encoding of one GML document to be finished before setting up schemas for the others. I don’t see an immediate solution for this, looks like we’d have to scrap XSD and the gt-xsd encoder, and use something else that can support concurrent access…
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