>From the few months experience, this is usually caused by an expired session token. If you login to your dhis2 and remain in-active for some few minutes (30 in my case), your session expires while you remain logged in and if you try to do anything else, you get blocked and this error. Login out and back in has been our way round this. There should be a place where you configure maximum allowed inactivity time but I cant remember where just now, am sure the more experienced users will advise.
Hope this helps even a bit. *Walusiku J. Muyunda* *Cell: +260967006614Cell: +260971000614* *"We have heaven to win and hell to shun, our lives testify better!" <http://wildvoices.blogspot.com/>* On Thu, Oct 25, 2018 at 6:01 AM Nibras Rakib <nibrasarra...@gmail.com> wrote: > Dear developers, > > While using DHIS2 (version-2.29), sometimes, we are facing following error > on the browser. > > Unable to get schemas from the DHIS2 API. > > While tailing the dhis.log file, we found following message:- > > WARN 2018-10-25 09:02:02,525 Failed to invoke @ExceptionHandler method: > public void > org.hisp.dhis.webapi.controller.CrudControllerAdvice.defaultExceptionHandler(java.lang.Exception,javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) > throws java.lang.Exception (ExceptionHandlerExceptionResolver.java > [http-nio-8080-exec-74]) > > java.lang.NullPointerException > > at > org.hisp.dhis.webapi.service.WebMessageService.send(WebMessageService.java:96) > > at > org.hisp.dhis.webapi.controller.CrudControllerAdvice.defaultExceptionHandler(CrudControllerAdvice.java:259) > > at > org.hisp.dhis.webapi.controller.CrudControllerAdvice$$FastClassBySpringCGLIB$$e80bbad6.invoke(<generated>) > > at > org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) > > at > org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:669) > > at > org.hisp.dhis.webapi.controller.metadata.sync.MetadataSyncController$$EnhancerBySpringCGLIB$$1c221b30.defaultExceptionHandler(<generated>) > at sun.reflect.GeneratedMethodAccessor1405.invoke(Unknown Source) > > Any idea why this is happening frequently? > > Thanks & Regards, > Rakib > _______________________________________________ > Mailing list: https://launchpad.net/~dhis2-devs > Post to : dhis2-devs@lists.launchpad.net > Unsubscribe : https://launchpad.net/~dhis2-devs > More help : https://help.launchpad.net/ListHelp >
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