Activiti Explorer 5.16.4 deployment to Weblogic Java 6

[ivan_activiti]

I am trying to deploy activiti-webapp-explorer2 5.16.4 module to Weblogic running on Java 6 and I am getting the following exception:

java.lang.ClassNotFoundException: javax.servlet.ServletRegistration$Dynamic

The same exception appears with activiti-explorer.war from activiti-5.16.4\wars folder. I had Explorer 5.16.3 running with no issues. What am I missing?

Thanks,
–Ivan

[jbarrez]

version 15.16.4 switched to Spring Java config instead of XML (see https://github.com/Activiti/Activiti/blob/master/modules/activiti-webapp-explorer2/src/main/java/org...)

So it seems like this class is missing on Weblogic Which version of WebLogic is this?

This seems to be consistent though: http://stackoverflow.com/questions/9531853/dynamic-add-servlet-in-weblogic-12c-not-work

So it seems for Weblogic another way of initializing must be used … But i can't find immediately what that option should be (except reverting to XML)

[ivan_activiti]

We are on Weblogic 10.3.6.0.

[ralferic]

I ran into that very same problem. As far as i can see, this is because activity now requires Servlet 3.0. (Please see Stacktrace below) Tomcat 6 is Servlet 2.5 only. The new WebConfigurer-class uses ServletRegistration.Dynamic, which is not available in Servlet-API 2.5. I would have expected this to be clearly documented. Even worse: activity installation guide is referring to Tomcat 6 and requires quite a bit of changes for Tomcat 7. An installtion guide that can not possibly work really does give me second thougths about using activity.

SCHWERWIEGEND: Error configuring application listener of class org.activiti.explorer.servlet.WebConfigurer
java.lang.NoClassDefFoundError: javax/servlet/ServletRegistration$Dynamic
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2539)
at java.lang.Class.getDeclaredMethods(Class.java:1860)
at org.apache.catalina.util.DefaultAnnotationProcessor.processAnnotations(DefaultAnnotationProcessor.java:226)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4153)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
at org.apache.catalina.manager.ManagerServlet.start(ManagerServlet.java:1276)
at org.apache.catalina.manager.HTMLManagerServlet.start(HTMLManagerServlet.java:625)
at org.apache.catalina.manager.HTMLManagerServlet.doGet(HTMLManagerServlet.java:136)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:193)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:701)
Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletRegistration$Dynamic
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
… 27 more

[ralferic]

Sorry, i referred to Tomcat 6. But as far as i know, Weblogic 10.3.6.0 is also Servlet 2.5.

[jbarrez]

We are aware of it and will update our docs in the 5.17 release. We didn't test it on Websphere (limited team and time, you know the drill) There is nothing wrong with using 5.16.3 at the moment though.

> An installtion guide that can not possibly work really does give me second thougths about using activity.

Ok, it's a free world and your choice. Alternatively, you could also step in and help us out here. We've got a limited amount of people and a limited amount of time and we would welcome for sure any patches that make it run on current websphere servers!

Also: it's Activiti with a i.

[priya1]

Do you have any plans to make Activiti 5.17 or 5.16.4 backward compatible  to suport Servlet 2.5

[jbarrez]

No, currently no plans. Unless somebody provides a patch to make it working on these app servers (while still working on the new ones)  ..(servlet 3 is also already from 2009)

[ndup0nt]

I'm thinking about creating such a patch.

From what I see in the source code :
* activiti-explorer (the project) relies on servlet 2.5 API
* the web.xml is also compliant with servlet 2.5
* only a few classes in activiti-webapp-explorer2 actually relies on Servlet 3.0

It looks like the only point is that the DispatcherServlet is programmatically configured (using Servlet 3.0) instead of web.xml. So basically I would only have to change this ? Am I missing something ?

[jbarrez]

That is a correct analysis.

We would for sure welcome such a patch!