Parsing EL expression in custom tag 10.1.3.4

Question

Hello all,
I have a custom tag that extends CoreOutputTextTag. This tag needs to resolve the El expression passed in from the value attribute and perform an operation with it. Since I this tag needs to work with adf 10.1.3.4, the jsp level is 1.2 and does not support container parsing of EL expression directly in the page ($).
I have tried a couple approaches but both of them result in just the same EL expression I pass in being returned to me. Anyone have an idea of the proper way to resolve an EL expression within a custom tag?
Thanks in advance,
- Joe
public class CoreOutputTextTag extends oracle.adfinternal.view.faces.taglib.core.output.CoreOutputTextTag {
    private String groupId;
    private String groupCode;
    private String value;
    public void setValue(String value) {
        this.value = value;
        super.setValue(value);
    public int doStartTag() throws JspException {
        super.doStartTag();
        UIComponent uiComponent = this.getComponentInstance();
        if (uiComponent instanceof CoreOutputText) {
            CoreOutputText coreOutputTextComponent =
                (CoreOutputText)uiComponent;
            if (coreOutputTextComponent.getValue() == null) {
                String codeValue =
                    (String)ExpressionEvaluatorManager.evaluate("value", value,
                                                                java.lang.String.class,
                                                                this,
                                                                pageContext); // the page context
                try {
                    ExpressionEvaluator expressionEvaluator =
                        pageContext.getExpressionEvaluator();
                    codeValue =
                            (String)expressionEvaluator.evaluate(value, java.lang.String.class,
                                                                 pageContext.getVariableResolver(),
                                                                 null);
                } catch (ELException elex) {
                SystemSettingRow row =
                    SystemSettings.getSystemSettings(groupId, groupCode, null,
                                                     value);
                if (row != null)
                    coreOutputTextComponent.setValue(row.getShortDesc());
        return TagSupport.SKIP_BODY;
    public void setGroupId(String groupId) {
        this.groupId = groupId;
    public String getGroupId() {
        return groupId;
    public void setGroupCode(String groupCode) {
        this.groupCode = groupCode;
    public String getGroupCode() {
        return groupCode;
<tag>
  <name>coreOutputText</name>
  <tag-class>od.adf.ics.ui.taglib.CoreOutputTextTag</tag-class>
  <body-content>empty</body-content>
  <attribute>
   <name>groupId</name>
   <required>true</required>
  </attribute>
  <attribute>
   <name>groupCode</name>
   <required>true</required>
  </attribute>
  <attribute>
   <name>id</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>truncateAt</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>description</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>escape</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>shortDesc</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>partialTriggers</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onclick</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>ondblclick</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onmousedown</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onmouseup</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onmouseover</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onmousemove</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onmouseout</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onkeypress</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onkeydown</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>onkeyup</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>styleClass</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>inlineStyle</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>value</name>
   <rtexprvalue>true</rtexprvalue>
  </attribute>
  <attribute>
   <name>converter</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>rendered</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>binding</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>attributeChangeListener</name>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
</tag>

Answer 1

I also would like to know how to accomplish this. I have a similar requirement and need to set the "disable" attribute on a commandbutton and requires an el statement that calls a methodAction defined on the pageDef.
I followed the great instructions over on this thread:
ADF FACES:Creating custom component on top of adf
on how to create custom adf tags for JDeveloper 10.1.3.4.
many thanks!
Wes
Edited by: Wes Fang on Sep 16, 2010 5:39 AM