I have been using the Display tag for quite a while, but now I am trying
to implement the "dynamic columns" feature, meaning passing an array of
column names so the <display:table> shows only those columns. Does anyone
else have this working?
The Display TableTag is using the
org.apache.taglibs.display.TableTag.lookup() method, which keeps throwing
a null pointer exception. Using System.out statements, I know that the
lookup() is not getting nulls for pageContext, columnsToDisplay, property,
and scope. And putting the lookup() in a try/catch block picks up the
thrown exception. Although I am passing values/objects to lookup(), I am
wondering if I am passing the *right* values/objects? I think (hope) it
will work, if I can just get past this.
My jsp contains (in part) ...
<bean:define id="columnArray">
<bean:write name="myForm" property="columns"/>
</bean:define>
<display:table name="myForm" property="myObjectArrayToDisplay"
columnsToDisplay="<%= columnArray %>" scope="request" >
The TableTag source code contains the following (in part) ...
public int doStartTag() throws JspException {
Object obj = null;
if (this.columnsToDisplay != null) {
obj = (String[]) lookup(this.pageContext,
this.columnsToDisplay,
this.property, this.scope, false);
}
if (obj != null) {
this.columnsDisplayArray = (String[]) obj;
}
HttpServletRequest req = (HttpServletRequest)this.pageContext.getRequest();
this.loadDefaultProperties();
<snip>
}
Can anyone shed some light on this?
Susan Bradeen
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