Tag instances - same instance being used across multiple tags

Question

Hi
          I am using BEA WebLogic Server 6.1 SP2
          Problem:
          Tag instances - same instance being used across multiple tags
          The problem is that when I use the same jsp tag several times in a page,
          The tag is being instantiated only one time, as a result the class
          attributes
          retain their values when activating the tags.
          Example:
          A code that demonstrates the problem (not sure that it is compiled)
          public FooTag extends TagSupport {
          private boolean isValid = true;
          private String name;
          public setName(String x){
          name = x;
          public int doStartTag() throws JspException
          if (name.equals("x"){
          isValid = false;
          return SKIP_BODY;
          public int doEndTag() {
          if (isValid){
          return EVAL_PAGE;
          <table>
          <tr>
          <td><mpower:FOOTAG name="x"/>
          <!-- isValid attribute is set to false -->
          A FOOTAG implmented in FooTag </td>
          </tr>
          <tr>
          <td><mpower:FOOTAG name="y"/>
          <!-- isValid attribute still false (we expected it to be true) ! -->
          A FOOTAG implmented in FooTag </td>
          </tr>
          </table>
          P.S.
          I am using the same tags library with Tomcat and iPlanet Application severs,
          I did not get this problem there !!
          

Answer 1

          What should I do to reinitialize the tag? We have the same problem on custom tag.
          We have TabSet tag, which contains a set of Tab tag. In Weblogic 5.1, everything
          works ok, however when we run it in weblogic 6.1, Tab object seems like share the
          same instance, say if I have 2 Tabs in the TabSet, it ends up shows 2 same tabs with
          the apperance of the last tab added to the tabset on the web browser. We do implement
          release() method to call super.release() of TagSupport class.
          Any help is very appreciated.
          Thanks,
          Kimberly
          "Simon Spruzen" <[email protected]> wrote:
          >
          >This is allowed. You must implement public void release() on your tag, and
          >WLS will
          >call it before this method if WLS elects to reuse the tag instance. Your
          >release
          >method just reinitialises the tag as required.
          >
          >simon.
          >
          >"Eyal H" <[email protected]> wrote:
          >>Hi
          >>
          >>I am using BEA WebLogic Server 6.1 SP2
          >>
          >>Problem:
          >>
          >>Tag instances - same instance being used across multiple tags
          >>
          >>The problem is that when I use the same jsp tag several times in a page,
          >>
          >>The tag is being instantiated only one time, as a result the class
          >>
          >>attributes
          >>
          >>retain their values when activating the tags.
          >>
          >>Example:
          >>
          >>A code that demonstrates the problem (not sure that it is compiled)
          >>
          >>public FooTag extends TagSupport {
          >>
          >>private boolean isValid = true;
          >>
          >>private String name;
          >>
          >>public setName(String x){
          >>
          >>name = x;
          >>
          >>}
          >>
          >>public int doStartTag() throws JspException
          >>
          >>if (name.equals("x"){
          >>
          >>isValid = false;
          >>
          >>}
          >>
          >>return SKIP_BODY;
          >>
          >>}
          >>
          >>public int doEndTag() {
          >>
          >>if (isValid){
          >>
          >>......
          >>
          >>}
          >>
          >>return EVAL_PAGE;
          >>
          >>}
          >>
          >>}
          >>
          >>
          >>
          >>
          >>
          >><table>
          >>
          >><tr>
          >>
          >><td><mpower:FOOTAG name="x"/>
          >>
          >><!-- isValid attribute is set to false -->
          >>
          >>A FOOTAG implmented in FooTag </td>
          >>
          >></tr>
          >>
          >><tr>
          >>
          >><td><mpower:FOOTAG name="y"/>
          >>
          >><!-- isValid attribute still false (we expected it to be true) ! -->
          >>
          >>A FOOTAG implmented in FooTag </td>
          >>
          >></tr>
          >>
          >></table>
          >>
          >>
          >>
          >>P.S.
          >>
          >>I am using the same tags library with Tomcat and iPlanet Application severs,
          >>
          >>I did not get this problem there !!
          >>
          >>
          >>
          >