Rtexprvalue true does not work

Question

I write a tag ,it works well( tomcat 5.5 ,jdk5):
     <u:repeat num="5">
               ${count} of 5<br>
          </u:repeat>
     <%
          request.setAttribute("number",2);
     %>
but when I use it like this:
          <u:repeat num="${number}">
               ${count} of 5
          </u:repeat>     
i got the error:
NumberFormatException: For input string: "${number}"
It seems the rtexprvalue does not work at runtime.
tag class:
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.util.HashMap;
import java.io.IOException;
public class RepeatSimpleTag extends SimpleTagSupport {
     private int num;
     public void doTag() throws JspException, IOException {
          for (int i = 0; i < num; i++) {
               getJspContext().setAttribute("count", String.valueOf(i + 1));
               getJspBody().invoke(null);
     public void setNum(int num) {
          this.num = num;
TLD:
     <tag>
          <name>repeat</name>
          <tag-class>boc.common.tags.RepeatSimpleTag</tag-class>
          <body-content>scriptless</body-content>
          <variable>
               <description>Current invocation count (1 to num)</description>
               <name-given>count</name-given>
          </variable>
          <attribute>
               <name>num</name>
               <required>true</required>
               <rtexprvalue>true</rtexprvalue>
          </attribute>
     </tag>
then I change the code to:
     public void setNum(String num) {
          this.num = Integer.parseInt(num);
still got the error
org.apache.jasper.JasperException: Exception in JSP: /WEB-INF/jsp/spring/userauth.jsp:22
19:           request.setAttribute("number",2);
20:      %>
21:      
22:           <u:repeat num="${number}">
23:                ${count} of 5
24:           </u:repeat>          
25:           <u:repeat num="5">
Stacktrace:
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
root cause
java.lang.NumberFormatException: For input string: "${number}"
     java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
     java.lang.Integer.parseInt(Integer.java:447)

Answer 1

I set <el-ignored>true</el-ignored>
change it to false and all is ok