Hi, I think you are right, it's probably a side effect of changes related to this issues
https://issues.apache.org/jira/browse/WW-4034 Could you register a new JIRA ticket to fix that? Regards -- Łukasz + 48 606 323 122 http://www.lenart.org.pl/ pon., 28 sty 2019 o 16:55 Eduardo Guadalupe <eduardo...@gmail.com> napisał(a): > > I suspect there is a concurrency issue with the DefaultJSONWriter > implementation. > I have overridden the JSONInterceptor so a new instance of JSONUtil is used > with every request and the issue is not happening anymore. I suppose there > is a performance cost with that change but for now it works. > > https://github.com/lalo-mx/struts/commit/ed29e3f4ed841ef13559c02da1c8dca9b68fb0a7 > > Does it sound reasonable what I have found? Or should I better review the > configuration / documentation for some other change that I have not > contemplated? > > On 2019/01/25 23:57:44, Eduardo Quintanilla <eduardo...@gmail.com> wrote: > > Hi, > > > > I recently upgraded Struts from version 2.3.34 to 2.5.20. After doing the > recommended fixes the application runs correctly but an exception started > happening sporadically. > > > > The app is built and runs in JDK 8 with Tomcat 9.0.12 > > > > The app is a little big so i have not able to create an example yet. > > The more relevant libraries in use are Spring + Struts + Hibernate > > > > Any tips about how to find the root cause of the issue? > > > > > > Request: > > Request URL: https://localhost/app/rest/custom.action > > Request Payload: {"params":["example"],"method":"load","id":1} > > > > Logs: > > DefaultDispatcherErrorHandler: Exception occurred during processing > request: null > > java.util.EmptyStackException: null > > at java.util.Stack.peek(Stack.java:102) ~[?:1.8.0_191] > > at java.util.Stack.pop(Stack.java:84) ~[?:1.8.0_191] > > at > org.apache.struts2.json.DefaultJSONWriter.process(DefaultJSONWriter.java:196) > ~[struts2-json-plugin-2.5.20.jar:2.5.20] > > at > org.apache.struts2.json.DefaultJSONWriter.value(DefaultJSONWriter.java:154) > ~[struts2-json-plugin-2.5.20.jar:2.5.20] > > at > org.apache.struts2.json.DefaultJSONWriter.write(DefaultJSONWriter.java:121) > ~[struts2-json-plugin-2.5.20.jar:2.5.20] > > at org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:140) > ~[struts2-json-plugin-2.5.20.jar:2.5.20] > > at org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:110) > ~[struts2-json-plugin-2.5.20.jar:2.5.20] > > at > org.apache.struts2.json.JSONInterceptor.intercept(JSONInterceptor.java:178) > ~[struts2-json-plugin-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:250) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:179) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.doIntercept(ConversionErrorInterceptor.java:142) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:137) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:137) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:201) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:133) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:101) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:142) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:160) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:175) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > org.apache.struts2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:121) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:167) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:203) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:196) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > org.apache.struts2.factory.StrutsActionProxy.execute(StrutsActionProxy.java:48) > ~[struts2-core-2.5.20.jar:2.5.20] > > at > org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:574) > [struts2-core-2.5.20.jar:2.5.20] > > at > org.apache.struts2.dispatcher.ExecuteOperations.executeAction(ExecuteOperations.java:79) > [struts2-core-2.5.20.jar:2.5.20] --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org