Custom Tag Error with Weblogic SP9

Question

          Hi
          I seem to be having a problem with a custom tag that I wrote. When I run the JSP
          on WLS (without a service pack), the generated java code uses the weblogic.utils.StringUtils
          class to interprete jsp expressions that are passed into the custom tag's attribute
          (on the JSP). The method called on this StringUtils class is valueOf(). This method
          in essence makes sure that the result of the expression is not null and then subsequently
          calls a toString() on the value. Note that if the value is null it simply returns
          an empty string.
          The problem is that when we go to service pack 9, this method is not called (StringUtils.valueOf()).
          Now the problem arises if first of all the result of the expression statement
          in the custom tag definintion (on the JSP) is null. Secondly, it will also error
          out when the setter method is called within the custom tag, if the object returned
          from the expression does not match the one that is expected by the tag... in our
          case a String.
          Here's a sample usage of the tag:
          <wescombop:selectTag
          selectName="buildingNumber"
          selectedItem="<%= buildingJB.getBuildingNumber()%>"
          trimSelectedItem="true"
          selectTagDataName="buildingNumberDataAttribute" />
          Note: buildingJB.getBuildingNumber() returns BigDecimal
          Here's a snipett of the line generated java:
          * Without the service pack
          comwestfieldgrp_wescom_bop_view_tag_SelectTag_1.setSelectedItem(weblogic.utils.StringUtils.valueOf(buildingJB.getBuildingNumber()));
          *With Service Pack 9
          comwestfieldgrp_wescom_bop_view_tag_SelectTag_1.setSelectedItem(buildingJB.getBuildingNumber());
          Note: The setSelectedItem() method expects a String object as a parameter, so
          the code with service pack 9 will result in a compilation error, since buildingJB.getBuildingNumber()
          returns a BigDecimal.
          Let me know if you need more explanation.
          Has anyone experience this problem before... Any help would be deeply appreciated.
          Thanks all.
          Niran
          

Answer 1

          Modify the <cewolf:param> tag.
          <cewolf:chart id="confchart" title="Reports" type="bar3d" yaxislabel="Time"> <cewolf:data>
          <cewolf:producer id="report"> <cewolf:param name="type" value="all" > </cewolf:param>
          </cewolf:producer> </cewolf:data> </cewolf:chart>
          "Balakrishnan" <[email protected]> wrote:
          >
          >We are using cewolf charting library in weblogic 7.0. The charting library
          >is implemented
          >as custom jsp tag library module.
          >
          >However, when the use the tag for displaying the chart, weblogic is producing
          >this compiler error.
          >
          >/reports/reportsView.jsp(108): no corresponding open tag for tag extension
          >close:
          >//[ null; Line: 108]
          >
          >Here's the corresponding source of the jsp file:
          >
          > <cewolf:chart id="confchart" title="Reports" type="bar3d" yaxislabel="Time">
          > <cewolf:data>
          > <cewolf:producer id="report">
          > <cewolf:param name="type" value="all" /> (<-- Error occurs
          >here.
          >Line no: 108)
          > </cewolf:producer>
          > </cewolf:data>
          > </cewolf:chart>
          >
          >I've also checked the corresponding tld file and it is in place.
          >
          >The same code without any modifications is working fine in tomcat. Can
          >you please
          >let me know what needs to be corrected to make this work?