problem caused by <distributable/>

[ddai]

Hi all

Now I think I have found the trouble maker: Once I add that tag into the web.xml, a problem shows up. When I deleted it, everything looks fine. Does that mean I need to modify the application codes?

Here is the outline of the error. Please help me. This is very important to me.

HTTP Status 500 -

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type Exception report

message

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

exception

org.apache.jasper.JasperException: setAttribute: Non-serializable attribute
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:395)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
InputValidationFilter.doFilter(InputValidationFilter.java:54)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)


root cause

java.lang.IllegalArgumentException: setAttribute: Non-serializable attribute
org.jboss.web.tomcat.tc5.session.ClusteredSession.setAttribute(ClusteredSession.java:532)
org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:129)
org.apache.jsp.gcsMenu_jsp._jspService(gcsMenu_jsp.java:450)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
InputValidationFilter.doFilter(InputValidationFilter.java:54)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.


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Apache Tomcat/5.5.20

[brian.stansberry]

If you mark your app distributable, that means its contents are serialized and replicated after each request. That means you can't put non-serializable objects in the session.

[ddai]

THank you!

Then how should I fix the problem?

[ddai]

THank you!

Then how should I fix the problem?

[ddai]

Please give me some clues on how I should remedy this. Does it mean I need to modify JSP codes?

Thanks a lot!

[brian.stansberry]

Find everything your app puts in the session and make sure all classes in the object graph properly implement java.io.Serializable or are marked as transient.

[ddai]

My boss is reluctant to change the codes. Is there something that JBoss can do to solve this?

Thanks!!!

[brian.stansberry]

No.

[ddai]

Could you possibliy tell from these error which particular objects here should be set to serializable?

[snedapunk]

When you try to set an attribute in the session that is not serializable, it will throw an exception with a stack trace. So the first thing I would probably do is open up gcsMenu.jsp and goto line 450 and see if you are putting an object into the session. If so, I then would open that object and make sure that it implements Serializable.

[brian.stansberry]

See also http://wiki.jboss.org/wiki/Wiki.jsp?page=DebuggingSerializationErrors.

[ddai]

Thanks a lot!

It looks like the NonSerializableAttributeTester.java can serialize any object passed as a value to HttpSession.setAtrribute.

But would you please tell me how to use it. Do I need to put it somewhere?

Thanks again

[ddai]

I saw the instructions. I just want to get it right.

Shall I just put the NonSerializableAttributeTester.class into the WEB-INF/classes folder and add <listener-class>org.jboss.web.tomcat.service.session.NonSerializableAttributeTester</listener-class> to the web.xml filel?