The Java EE 5 Tutorial

Tag Handler

The collection is set in the tag handler by means of the group attribute. The tag handler retrieves an element from the group and passes the element back to the page in the EL variable whose name is determined by the var attribute. The variable is accessed in the calling page using the JSP expression language. After the variable is set, the tag body is evaluated with the invoke method.

public void doTag() throws JspException, IOException {
    if (iterator == null)
    while (iterator.hasNext()) {
public void setVar(String var) {
    this.var = var;
public void setGroup(Collection group) { = group;
    if(group.size() > 0)
        iterator = group.iterator();