Robert,
Since it looks like you're using javax.servlet.jsp.tagext.SimpleTagSupport, I'll
assume your're running on a JSP 2.0 container. I haven't looked closely at the
rest of your code yet, but the first thing to do is make sure your web app is
using a Servlet 2.4 deployment descriptor (web.xml).
Quoting "Robert Simmons Jr." <[EMAIL PROTECTED]>:
> Greetings;
>
> I have a tag that I created to allow integration with my back end. I am
> using the Jakarta astandard taglibs extensively in the application but I
> am a bit of a taglib newbie and I have a problem. Namely when I use EL
> expressions in my tag attributes, they get passed verbatim to the tag
> and never evaluated.
>
> For example, if I use:
>
> <cs:subscriptionInfo targetID="${subID}" nameVar="subName"
> descriptionVar="subDesc"/>
>
> Then targetID gets passed the literal string ${subID} which causes the
> page to
> explode since targetID needs to be a long. The TLD for this tag is
> indicated below:
>
> <tag>
> <description>
> Fetches information on a particular subscription.
> </description>
> <name>subscriptionInfo</name>
>
>
<tag-class>com.bmw.candy.candiedServices.tags.TagSubscriptionInfo</tag-class>
> <body-content>empty</body-content>
> <attribute>
> <description>
> ID of the subscription for which to obtain info.
> </description>
> <name>targetID</name>
> <type>java.lang.Long</type>
> <required>true</required>
> <rtexprvalue>true</rtexprvalue>
> </attribute>
> <attribute>
> <description>
> The variable in which to store the subscription name.
> </description>
> <name>nameVar</name>
> <type>java.lang.String</type>
> <required>false</required>
> <rtexprvalue>true</rtexprvalue>
> </attribute>
> <attribute>
> <description>
> The variable in which to store the subscription description.
> </description>
> <name>descriptionVar</name>
> <type>java.lang.String</type>
> <required>false</required>
> <rtexprvalue>true</rtexprvalue>
> </attribute>
> <attribute>
> <description>
> The variable in which to store the subscription items.
> </description>
> <name>itemsVar</name>
> <type>java.lang.String</type>
> <required>false</required>
> <rtexprvalue>true</rtexprvalue>
> </attribute>
> <attribute>
> <description>
> The variable in which to store the subscription last
> sequence number.
> </description>
> <name>sequenceNumVar</name>
> <type>java.lang.String</type>
> <required>false</required>
> <rtexprvalue>true</rtexprvalue>
> </attribute>
> </tag>
>
> You can see that I set rtexprvalue to true in all cases yet there is no
> resolution hapening. The implementation of this tag is shown here:
>
> import java.io.IOException;
>
> import javax.servlet.jsp.JspException;
> import javax.servlet.jsp.tagext.SimpleTagSupport;
>
> import com.bmw.candy.candiedServices.SubscriptionAccess;
> import com.bmw.candy.candiedServices.data.Subscription;
>
> /**
> * Get the information on a subscription and store it in some JSP variables.
> */
> public class TagSubscriptionInfo extends SimpleTagSupport {
> /** The ID of the subscription to obtain info on. */
> private long targetID = -1;
>
> /** The variable in which to store the subscription name. */
> private String nameVar = null;
>
> /** The variable in which to store the subscription description. */
> private String descriptionVar = null;
>
> /** The variable in which to store the subscription items. */
> private String itemsVar = null;
>
> /** The variable in which to store the subscription last sequence
> number. */
> private String sequenceNumVar = null;
>
> /** [EMAIL PROTECTED] */
> public void doTag() throws JspException, IOException {
> if (this.targetID < 0)
> throw new IllegalArgumentException("targetID"); //$NON-NLS-1$
> SubscriptionAccess access = new SubscriptionAccess();
> Subscription subscription =
> access.getSubscriptionInfo(this.targetID);
> if (this.nameVar != null) {
> getJspContext().setAttribute(this.nameVar,
> subscription.getName());
> }
> if (this.descriptionVar != null) {
> getJspContext().setAttribute(this.descriptionVar,
> subscription.getDescription());
> }
> if (this.itemsVar != null) {
> getJspContext().setAttribute(this.itemsVar,
> subscription.getItems());
> }
> if (this.sequenceNumVar != null) {
> getJspContext().setAttribute(this.sequenceNumVar,
> new
> Integer(subscription.getSequenceNum()));
> }
> }
>
> /**
> * @param descriptionVar The variable in which to store the subscription
> description.
> */
> public void setDescriptionVar(String descriptionVar) {
> this.descriptionVar = descriptionVar;
> }
>
> /**
> * @param itemVar The variable in which to store the subscription items.
> */
> public void setItemsVar(String itemsVar) {
> this.itemsVar = itemsVar;
> }
>
> /**
> * @param nameVar The variable in which to store the subscription name.
> */
> public void setNameVar(String nameVar) {
> this.nameVar = nameVar;
> }
>
> /**
> * @param targetID The ID of the subscription to obtain info on.
> */
> public void setTargetID(long targetID) {
> this.targetID = targetID;
> }
>
> /**
> * @param sequenceNumVar The variable in which to store the subscription
> last sequence number.
> */
> public void setSequenceNumVar(String sequenceNumVar) {
> this.sequenceNumVar = sequenceNumVar;
> }
> }
>
>
> So what Might I be doing wrong? I have googled for this for hours on end
> with no enlightenment. I am currently using the jsp:attribute tag to
> work around this but would really like to fix this once and for all.
>
> Thanks in advance.
>
> -- Robert
--
Kris Schneider <mailto:[EMAIL PROTECTED]>
D.O.Tech <http://www.dotech.com/>
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