IndexOutOfBounds in BeanUtils.Populate()

[Amit Gupta]

We are having a jsp page in which we are having struts <Logic:iterate tag for dispaying table
Inside that logic iterate each row is having check box
Now when session times out and user submit jsp page by selecting one or more than one check box index out of bounds exception is comming in BeanUtils.Populate()


HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

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

exception

javax.servlet.ServletException: BeanUtils.populate
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:495)
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:805)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)


root cause

java.lang.ArrayIndexOutOfBoundsException
java.lang.reflect.Array.get(Native Method)
org.apache.commons.beanutils.PropertyUtilsBean.getIndexedProperty(PropertyUtilsBean.java:437)
org.apache.commons.beanutils.PropertyUtilsBean.getIndexedProperty(PropertyUtilsBean.java:340)
org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:684)
org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:715)
org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:884)
org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811)
org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298)
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493)
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:805)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.


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Apache Tomcat/5.5.9
[ February 27, 2006: Message edited by: Bear Bibeault ]

[Bear Bibeault]

Since the problem seems to involve Struts tags, moved to that forum.

[Brent Sterling]

My guess is this...since I see by the dump that you are using indexed properties: When your page displayed your form had a populated array or List...I am guessing that you are storing your forms as session scope...when the session expires the form with the populated List goes away as well...when you submit the form Struts creates a new instance of your form, but the List is now null (or empty)...the exception is then thrown when Struts tries to access indexes that no longer exist.

You could try some code like this:

    public void setValue(int index, Boolean value)
    {
        if(this.valueList == null)
        {
            this.valueList = new ArrayList();
        }
 
        while(index >= this.valueList.size())
        {
            this.valueList.add(new Boolean());
        }
 
        valueList.set(index, value);
    }

- Brent