Hi,
I tried to install the workflow module to my Community Edition 4.4.5. Therefore 
I copied the magnolia-module-workflow-4.4.5.jar out of the add on folder to 
/magnolia-4.4.5/apache-tomcat-6.0.32/webapps/magnoliaAuthor/WEB-INF/lib and 
followed these instructions:

http://documentation.magnolia-cms.com/modules.html#Installing

But when clicked on "Start up magnolia", I got an Tomcat Error. So I wanted to 
uninstall this module by deleting the jar file out of the lib folder. Now I am 
able to access the AdminCentral again but in the Website workspace there is a 
Tomcat Error once again. 

[code]
HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from 
fulfilling this request.

exception

java.lang.RuntimeException: java.lang.NullPointerException
        
info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:159)
        
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        
info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:75)
        
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        
info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73)
        
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
        
info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:64)
        
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:88)
        
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        
info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:85)
        
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
        
info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:86)
        
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        
info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
        
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:120)
        
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
        
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
        
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
        
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
        
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:105)
        
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:216)

root cause

java.lang.NullPointerException
        
info.magnolia.module.admininterface.AdminTreeMVCHandler.setConfiguration(AdminTreeMVCHandler.java:925)
        
info.magnolia.module.admininterface.AdminTreeMVCHandler.getConfiguration(AdminTreeMVCHandler.java:914)
        
info.magnolia.module.admininterface.AdminTreeMVCHandler.renderTree(AdminTreeMVCHandler.java:816)
        
info.magnolia.module.admininterface.AdminTreeMVCHandler.renderHtml(AdminTreeMVCHandler.java:777)
        info.magnolia.cms.servlets.MVCServlet.doPost(MVCServlet.java:124)
        info.magnolia.cms.servlets.MVCServlet.doGet(MVCServlet.java:69)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
[/code]

This is just driving me crazy! How is it possible to destroy the system so 
badly simply by trying to install a module?!?!?
Any help is appreciated!

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=b2146599-c9a2-4856-b9ab-56e1868b092f


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