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ConcurrentModificationException

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I see this in my application log. Does this happen because of too many webservice calls on the same object? java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(Unknown Source) at java.util.HashMap$KeyIterator.next(Unknown Source) at com.mendix.core.MxRuntime.a(SourceFile:1004) at iR.c(SourceFile:235) at iR.a(SourceFile:209) at nY.a(SourceFile:72) at oa.b(SourceFile:97) at oa.a(SourceFile:60) at com.mendix.modules.webservices.WebserviceModule.handleWebserviceCall(SourceFile:357) at jl.processRequest(SourceFile:27) at ji.a(SourceFile:74) at com.mendix.core.MxRuntime.processRequest(SourceFile:908) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:45) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111) at org.eclipse.jetty.server.Server.handle(Server.java:351) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454) at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:900) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:954) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:857) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:609) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:45) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:599) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:534) at java.lang.Thread.run(Unknown Source)

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