I am using SOLR 6.6.0 and real-time get to retrieve documents. Randomly I am seeing nullpointer exceptions in solr log files which in turn breaks the application workflow. Exception stack trace is at the end of the description
I am thinking this could be related to real-time get, when transforming child documents during get, may be child elements are not available due to any pending / uncommitted transactions to SOLR index. The same retrieval works fine after some time, which makes me think that this could be related to committing the changes to index or may be a transaction issue. But couldn't figure out where the bottle neck is. Has anyone faced similar issue or familiar with the exception ??
The same exception is being logged by two different loggers HttpSolrCall and RequestHandlerBase in solr log file at the same time stamp.
null:java.lang.NullPointerException at org.apache.solr.response.transform.ChildDocTransformer.transform(ChildDocTransformerFactory.java:136) at org.apache.solr.handler.component.RealTimeGetComponent.process(RealTimeGetComponent.java:253) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:296) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:173) at org.apache.solr.core.SolrCore.execute(SolrCore.java:2477) at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:723) at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:529) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:361) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:305) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1691) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.server.Server.handle(Server.java:534) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95) at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589) at java.lang.Thread.run(Thread.java:748)
