12.1p serverside NullPointerException question in AppBase.java

[Blama]

Hi Isomorphic,

I'm getting this server side java.lang.NullPointerException in v12.1p_2022-08-10 for exactly one of my customers. It happens in the processing of a RESTHandler Request.
Could you have a look at AppBase.executeDefaultDSOperation(AppBase.java:658) and point me in the direction of the problem? I assume something is minimally different with that customer's requests. My code in LMSSQLDataSource.java:165 is just the catch/log/rethrow after a return super.execute(request).

Thank you & Best regards
Blama

java.lang.RuntimeException: An unexpected error occured. Please try again later!
    at com.lmscompany.lms.server.LMSSQLDataSource.execute(LMSSQLDataSource.java:165)
    at com.isomorphic.application.AppBase.executeDefaultDSOperation(AppBase.java:658)
    at com.isomorphic.application.AppBase.executeAppOperation(AppBase.java:555)
    at com.isomorphic.application.AppBase.execute(AppBase.java:498)
    at com.isomorphic.datasource.DSRequest.execute(DSRequest.java:3101)
    at com.lmscompany.lms.server.LMSRESTHandler.processRestTransaction(LMSRESTHandler.java:56)
    at com.isomorphic.servlet.RESTHandler.processRequest(RESTHandler.java:587)
    at com.isomorphic.servlet.RESTHandler.doPost(RESTHandler.java:477)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:681)
    at com.isomorphic.servlet.BaseServlet.service(BaseServlet.java:178)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at com.lmscompany.lms.server.datasource.LmsPersistenceUnitSelectionFilter.doFilter(LmsPersistenceUnitSelectionFilter.java:42)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at com.lmscompany.lms.server.ExceptionLoggingFilter.doFilter(ExceptionLoggingFilter.java:28)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at com.lmscompany.lms.server.RequestLoggingFilter.doFilter(RequestLoggingFilter.java:41)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at com.lmscompany.lms.server.session.DeviceFilter.doFilter(DeviceFilter.java:34)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at com.lmscompany.lms.server.XSSProtectionFilter.doFilter(XSSProtectionFilter.java:27)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.apache.catalina.filters.HttpHeaderSecurityFilter.doFilter(HttpHeaderSecurityFilter.java:126)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at com.isomorphic.servlet.CompressionFilter._doFilter(CompressionFilter.java:263)
    at com.isomorphic.servlet.BaseFilter.doFilter(BaseFilter.java:91)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.valves.rewrite.RewriteValve.invoke(RewriteValve.java:555)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
    at org.apache.catalina.ha.tcp.ReplicationValve.invoke(ReplicationValve.java:329)
    at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:769)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:359)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:889)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
    at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException

[Isomorphic]

AppBase line 658 is just calling your code via DataSource.execute(). Unfortunately, your try/catch does not log the original exception, so all we know is that somewhere downstream of super.execute() there is an NPE, and there is no way to know where or even what class.

So, you need to alter your try/catch to log the original exception stack trace.