[Building Sakai] Browser back-arrow problem

Claudia Roberta claudia.icmc at gmail.com
Thu Sep 8 12:41:50 PDT 2011 

Hi guys,

I'm having problems with the browser's back-arrow. The same problem reported
in Jira:

https://jira.sakaiproject.org/browse/SAK-7880?page=com.atlassian.jira.plugin.system.issuetabpanels%3Aall-tabpanel#issue-tabs

"The back arrow in a browser does not allow a user to navigate backward
through successive pages of a tool's workflow. This proves to be highly
disorienting and frustrating for users, who have to re-educate their learned
web behavior simply to accommodate Sakai."

Help! Please!
Any idea?

Tks,

Claudia


** Log:

java.lang.NullPointerException
    at org.sakaiproject.login.tool.LoginTool.doPost(LoginTool.java:405)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:188)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:571)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:188)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(
ApplicationDispatcher.java:691)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(
ApplicationDispatcher.java:469)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(
ApplicationDispatcher.java:364)
    at org.apache.catalina.core.ApplicationDispatcher.forward(
ApplicationDispatcher.java:301)
    at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.help(
ActiveToolComponent.java:556)
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.
doLogin(SkinnableCharonPortal.java:861)
    at org.sakaiproject.portal.charon.handlers.XLoginHandler.
doGet(XLoginHandler.java:61)
    at org.sakaiproject.portal.charon.handlers.XLoginHandler.
doPost(XLoginHandler.java:50)
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.
doPost(SkinnableCharonPortal.java:1059)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:188)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:622)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:210)
    at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:174)
    at org.apache.catalina.core.StandardHostValve.invoke(
StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(
ErrorReportValve.java:117)
    at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(
CoyoteAdapter.java:151)
    at org.apache.coyote.http11.Http11Processor.process(
Http11Processor.java:870)
    at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.
processConnection(Http11BaseProtocol.java:665)
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(
PoolTcpEndpoint.java:528)
    at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(
LeaderFollowerWorkerThread.java:81)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
ThreadPool.java:685)
    at java.lang.Thread.run(Thread.java:595)



org.sakaiproject.portal.api.PortalHandlerException:
java.lang.NullPointerException
    at org.sakaiproject.portal.charon.handlers.XLoginHandler.
doPost(XLoginHandler.java:50)
caused by: java.lang.NullPointerException
    at org.sakaiproject.login.tool.LoginTool.doPost(LoginTool.java:405)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:188)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:571)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:188)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(
ApplicationDispatcher.java:691)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(
ApplicationDispatcher.java:469)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(
ApplicationDispatcher.java:364)
    at org.apache.catalina.core.ApplicationDispatcher.forward(
ApplicationDispatcher.java:301)
    at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.help(
ActiveToolComponent.java:556)
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.
doLogin(SkinnableCharonPortal.java:861)
    at org.sakaiproject.portal.charon.handlers.XLoginHandler.
doGet(XLoginHandler.java:61)
    at org.sakaiproject.portal.charon.handlers.XLoginHandler.
doPost(XLoginHandler.java:50)
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.
doPost(SkinnableCharonPortal.java:1059)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:188)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:622)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:210)
    at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:174)
    at org.apache.catalina.core.StandardHostValve.invoke(
StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(
ErrorReportValve.java:117)
    at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(
CoyoteAdapter.java:151)
    at org.apache.coyote.http11.Http11Processor.process(
Http11Processor.java:870)
    at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.
processConnection(Http11BaseProtocol.java:665)
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(
PoolTcpEndpoint.java:528)
    at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(
LeaderFollowerWorkerThread.java:81)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
ThreadPool.java:685)
    at java.lang.Thread.run(Thread.java:595)
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