Custom tag - setProperties() not called

Hi all,
I've created my first custom tag with it's own component class, Tag Class, Renderer and TLD. However, when the JSP first loads, the encode() method fails in trying to get the attribute values from the attribute Map - the Map is empty. Upon further debugging I can see that the Tag class is called and the setter methods are called for each attribute but the setProperties() method is never called before release(), so the attributes are never stored in the UIComponent's attribute Map.
Anybody know what I'm doing wrong?
Some code:
Tag Class...
public class ListShuttleTag extends UIComponentTag
public void setProperites(UIComponent component)
super.setProperties(component);
ComponentTagHelper.setString(component, "sourceValue", sourceValue);
ComponentTagHelper.setString(component, "targetValue", targetValue);
ComponentTagHelper.setInteger(component, "size", size);
ComponentTagHelper.setInteger(component, "targetListWidth", targetListWidth);
ComponentTagHelper.setInteger(component, "sourceListWidth", sourceListWidth);
ComponentTagHelper.setString(component, "sourceCaption", sourceCaption);
ComponentTagHelper.setString(component, "targetCaption", targetCaption);
...TLD...
<taglib>
    <tlib-version>1.1</tlib-version>
    <jsp-version>2.1</jsp-version>
    <tag>
      <name>listShuttle</name>
      <tag-class>com.katun.jsf.tag.ListShuttleTag</tag-class>
      <description>A listShuttle allows the moving of items from one listBox to another</description>
      
      <attribute>
        <name>binding</name>
        <description>
             A binding that points to a bean property
        </description>
      </attribute>
      <attribute>
        <name>id</name>
        <description>The client id of this component</description>
      </attribute>
      <attribute>
        <name>rendered</name>
        <description>Is this component rendered?</description>
      </attribute>
      <attribute>
        <name>disabled</name>
        <description>Is this component disabled?</description>
      </attribute>
      <attribute>
        <name>required</name>
        <description>Is this component required?</description>
      </attribute>
      
      <attribute>
        <name>sourceValue</name>
        <required>true</required>
        <description>A binding for the items in the source list</description>
      </attribute>
      <attribute>
        <name>targetValue</name>
        <description>A binding for the items in the target list</description>
      </attribute>
      <attribute>
        <name>size</name>
        <description>Defines the number of items visible in each list</description>
      </attribute>
      <attribute>
        <name>sourceListWidth</name>
        <description>Width of the source list</description>
      </attribute>
      <attribute>
        <name>targetListWidth</name>
        <description>Width of the target list</description>
      </attribute>
      <attribute>
        <name>sourceCaption</name>
        <description>Label displayed above the source list</description>
      </attribute>
      <attribute>
        <name>targetCaption</name>
        <description>Label displayed above the target list</description>
      </attribute>
    </tag>
...

Gotcha........
First, this is what the jsp spec has to say in sec 1.14.1
When using scriptlet expressions, the expression must
appear by itself (multiple expressions, and mixing of expressions and string
constants are not permitted). Multiple operations must be performed within the
expression.Simple, isnt it ? All you have to is evaluate the expression as a whole.
<form:toolbaritem id="icon_cancelar" action="<%="javascript:listingAction('" + request.getContextPath() + "/logout.do;')"%>" icon<%= request.getContextPath() + " /images/toolbar/Cancelar_32.gif " %>"/>cheers,
ram.

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http://help.sap.com/saphelp_nw70/helpdata/EN/54/f91fba71ae48309e4267b4a36fa47b/frameset.htm
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SAP Netweaver Developers Guide - Integrating Security Functions
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Java iView Runtime
An exception occured while processing your request.
If this situation persists, please contact your system administrator.
If you solved your problem, can you please share the solution with me?
Thanks,
Regards,
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Hi all,
I've a strange behaviour on a web application for which I developed a custom tag to render a tree structure.
This tag take in input an object representing the tree with all its nodes, and render every node, calling hitself recursively for every child of every node.
This tag is used inside a jsp.
I deployed my webapp on JBoss in a WinXP Pro environment, and everything is ok. Then I deployed the same webapp on JBoss in a Linux Env, and the call to the custom tag... doesn't write anything (with the same input).
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<%@ tag language="java" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib uri="http://jakarta.apache.org/taglibs/log-1.0" prefix="log" %>
*<%@ taglib prefix="ousel" tagdir="/WEB-INF/tags/ouselector" %>*
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<%@ attribute name="subroot_index" required="true" type="java.lang.Integer"%>
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</c:if>
</li>The TreeObject contains a list of children that can contain other children and so on. On every child, I call recursively my custom tag to render with a set of nested <ul> elements the entire tree structure.
Here the call from the jsp:
<%@ taglib uri="http://jakarta.apache.org/taglibs/log-1.0" prefix="log" %>
*<%@ taglib prefix="ousel" tagdir="/WEB-INF/tags/ouselector" %>*
<log:debug category="${logcategory}" message="Building subtree ${ouSubtree} HTML structure..." />
*<ousel:outree subtree="${ouSubtree}" subroot_index="1"/>*
<log:debug category="${logcategory}" message="Subtree ${ouSubtree} HTML structure built" />
...Jakarta log taglibs is used to log the value of the parameter passed to the custom tag. In the Linux env I see that the passed object is not empty (it couldn't be null because the tag enforce it as a mandatory value).
Any idea?

I have found a workaround.
Simply substitute the recursive invocation, with an import of a jsp that will call the custom tag.
Note: You have to set your needed variable in request to make it visible to the jsp
<%@ tag language="java" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib uri="http://jakarta.apache.org/taglibs/log-1.0" prefix="log" %>
<%@ attribute name="subtree"
          required="true"
          type="my.webapp.TreeObject" %>
<%@ attribute name="subroot_index" required="true" type="java.lang.Integer"%>
<log:debug category="my.webapp.ousearch.taglib" message="Tag library called, starting operations..." />
<c:if test="${not empty subtree.children}">
     <c:set var="next_subtree_index" value="${subroot_index + 1}"/>
     <ul class="subtree" id="subtree-${subroot_index}">
     <log:debug category="${logcategory}" message="We have children, calling recursively tag library on them (next subtree index: ${next_subtree_index})..." />
     <c:forEach var="currentOUChild" items="${subtree.children}">
                *<c:set var="_currentOUChild" value="${currentOUChild}" scope="request"/>*
                *<c:set var="_next_subtree_index" value="${next_subtree_index}" scope="request"/>*
          *<c:import url="/WEB-INF/tags/outtree.jsp"/>*
          <c:set var="next_subtree_index" value="${next_subtree_index + 1}"/>
     </c:forEach>
     </ul>
</c:if>
</li>Here is the imported jsp (outtree.jsp):
<%@ taglib prefix="ousel" tagdir="/WEB-INF/tags/ouselector" %>
<ousel:outree subtree="${_currentOUChild}" subroot_index="${_next_subtree_index}"/>

Re: Using ScopeCache custom tag

Hi, I am quite new to ColdFusion and I have a calendar that
is quite slow due to the cfloops it uses to build the calendar. As
the page does not change very often I wanted to use Raymond
Camden's ScopeCache custom tag. However, for some reason the custom
tag was not getting picked up from the custom tag folder on the
server. I have successfully used components so have tried to
convert the custom tag to a component but get the following error
message:
Routines cannot be declared more than once.
The routine scope_Cache has been declared twice in the same
file.
This is the component:

<cfcomponent>
<cffunction name="scope_Cache" access="public"
returntype="string">
<cfargument name="cachename" type="string"
required="yes">
<cfargument name="scope" type="string" required="yes">
<cfargument name="timeout" type="string"
required="yes">
<cfprocessingdirective pageencoding="utf-8">

<cfif isDefined("arguments.cachename")>
<cfset arguments.name = arguments.cachename>
</cfif>--->

<cfif (not isDefined("arguments.name") or not
isSimpleValue(arguments.name)) and not
isDefined("arguments.clearall")>
<cfthrow message="scopeCache: The name attribute must be
passed as a string.">
</cfif>
<cfif not isDefined("arguments.scope") or not
isSimpleValue(arguments.scope) or not
listFindNoCase("application,session,server",arguments.scope)>
<cfthrow message="scopeCache: The scope attribute must be
passed as one of: application, session, or server.">
</cfif>

<cfparam name="arguments.timeout"
default="#createDate(3999,1,1)#">

<cfparam name="arguments.dependancies" default=""
type="string">
<cfif not isDate(arguments.timeout) and (not
isNumeric(arguments.timeout) or arguments.timeout lte 0)>
<cfthrow message="scopeCache: The timeout attribute must
be either a date/time or a number greather zero.">
<cfelseif isNumeric(arguments.timeout)>

<cfset arguments.timeout =
dateAdd("s",arguments.timeout,now())>
</cfif>

<cfset ptr = structGet(arguments.scope)>

<cfif not structKeyExists(ptr,"scopeCache")>
<cfset ptr["scopeCache"] = structNew()>
</cfif>
<cfif isDefined("arguments.clearAll")>
<cfset structClear(ptr["scopeCache"])>
<cfexit method="exitTag">
</cfif>

<cfset cleanup = "">

<cfset dontRun = false>
<cfif isDefined("arguments.clear") and arguments.clear
and structKeyExists(ptr.scopeCache,arguments.name) and
thisTag.executionMode is "start">
<cfif
structKeyExists(ptr.scopeCache[arguments.name],"dependancies")>
<cfset cleanup =
ptr.scopeCache[arguments.name].dependancies>
</cfif>
<cfset structDelete(ptr.scopeCache,arguments.name)>
<cfset dontRun = true>
</cfif>
<cfif not dontRun>
<cfif thisTag.executionMode is "start">

<cfif structKeyExists(ptr.scopeCache,arguments.name)>
<cfif
dateCompare(now(),ptr.scopeCache[arguments.name].timeout) is -1>
<cfif not isDefined("arguments.r_Data")>
<cfoutput>#ptr.scopeCache[arguments.name].value#</cfoutput>
<cfelse>
<cfset caller[arguments.r_Data] =
ptr.scopeCache[arguments.name].value>
</cfif>
<cfexit>
</cfif>
</cfif>
<cfelse>

<cfif structKeyExists(ptr.scopeCache,arguments.name) and
structKeyExists(ptr.scopeCache[arguments.name],"dependancies")>
<cfif
structKeyExists(ptr.scopeCache[arguments.name],"dependancies")>
<cfset cleanup = listAppend(cleanup,
ptr.scopeCache[arguments.name].dependancies)>
</cfif>
</cfif>
<cfset ptr.scopeCache[arguments.name] = structNew()>
<cfif not isDefined("arguments.data")>
<cfset ptr.scopeCache[arguments.name].value =
thistag.generatedcontent>
<cfelse>
<cfset ptr.scopeCache[arguments.name].value =
arguments.data>
</cfif>
<cfset ptr.scopeCache[arguments.name].timeout =
arguments.timeout>
<cfset ptr.scopeCache[arguments.name].dependancies =
arguments.dependancies>
<cfif isDefined("arguments.r_Data")>
<cfset caller[arguments.r_Data] =
ptr.scopeCache[arguments.name].value>
</cfif>
</cfif>
</cfif>

<cfset z = 1>
<cfloop condition="listLen(cleanup)">
<cfset z = z+1><cfif z gt 100><cfthrow
message="ack"></cfif>
<cfset toKill = listFirst(cleanup)>
<cfset cleanUp = listRest(cleanup)>
<cfif structKeyExists(ptr.scopeCache, toKill)>
<cfloop index="item"
list="#ptr.scopeCache[toKill].dependancies#">
<cfif not listFindNoCase(cleanup, item)>
<cfset cleanup = listAppend(cleanup, item)>
</cfif>
</cfloop>
<cfset structDelete(ptr.scopeCache,toKill)>
</cfif>
</cfloop>
<cfreturn scope_Cache>
</cffunction>
</cfcomponent>

Hi, thanks to both of you for your help. I reverted back the
custom tag and it was picked up this time - I don't know what
happened before. The functionality works as expected but I have hit
another problem and I am hoping I can tap your combined ColdFusion
wisdom to solve!!
The calendar returns leave records for staff and filters the
records using a querystring variable appended when the user clicks
on a particular month. However, what members of staff the user sees
depends on the data held in the users' session variables based on
their authority. The reason I wanted to use caching is because the
page takes a good ten seconds to run because of the use of cfloops
for the members of staff and the days of the week to dynamically
build the page. Using the custom tag would have worked if all
members of staff saw the same calendar data and could only see one
month. Can you see anyway I can speed up the page and do you think
caching is the way forward here?

Assigning bean property to custom tag's attribute

1. The #{beanName.property} notation can only be used inside JSF tags.
2. The attributes of custom tags does not accept embedded tags.
e.g. <prefix:tagName attrib1="<jsftag>">
I need to assign a bean's property to the attrib1 attribute. how do I do this?

Alternatively, how can I assign the value of a bean property to a variable?
e.g.
<%
int var=<bean.property>
%>
I can use the variable on the custom tag like this:
<prefix:tagName attrib1="<%=var%>"> OR
But this may not be the best solution though because I have to use scriptlets...

Further custom tag travails...

All,
          I have posted previously that custom tags can not handle JSP in their
          attributes. This turns out to be incorrect. In fact, they can, but
          there are some serious bugs when using it which made it seem like they
          couldn't.
          The following jsp works perfectly fine:
          <% String myAttribute="Thusly my attribute is" %>
          <mytaglib:mytag myattribute="<%=myAttribute%>" />
          However, the following jsp will break:
          <mytaglib:mytag myattribute="<%="Thusly my attribute is"%>" />
          because the jsp parser thinks that the second quote is ending the
          attribute instead of starting a string. Hence, the jsp compiler sees:
          <mytaglib:mytag myattribute="<%="
          and then some garbage including a > which it assumes means that mytag is
          closing. This really, really screws things up...
          The exact error I get is:
          /tagtester.jsp(38): no corresponding open tag for tag extension close:
          Now, I also get an error if I do something like this:
          <% String myAttribute="Thusly my attribute is" %>
          <mytaglib:mytag myattribute=" <%=myAttribute%>" />
          Where I have put some one space before the jsp. The error message is
          different:
          /_tagtester.java:84: String not terminated at end of line.
          Looking at the jsp .java file indicates that this also is a parsing
          problem...
          Is weblogic aware of these issues? Will they be fixed in sp6?
          Thanks,
          Carson


This is a consequence of the JSP spec and how it parses attribute values.
          Similar issues occur using standard boilerplate XML.
          The easy way around these problems is to use the fact that both single and
          double quotes are allowable in XML attribute values so try using code like
          this instead:-
          <mytaglib:mytag myattribute='<%="Thusly my attribute is"%>' />
          Then you will not get any JSP compilation errors.
          Regards
          James
          James Strachan
          =============
          email: [email protected]
          web: http://www.metastuff.com
          "Cameron Purdy" <[email protected]> wrote in message
          news:[email protected]...
          > I saw this refererred to (in a different context altogether) in some W3
          > documents referring to issues with input type attributes and xml ... I
          think
          > in the context of XSL. In other words, I am not sure if it is a WL bug or
          > just something that you can not do. I know that isn't the answer that you
          > are looking for ;-( ... perhaps you can escape some of those quotes.
          >
          > --
          >
          > Cameron Purdy
          > [email protected]
          > http://www.tangosol.com
          > WebLogic Consulting Available
          >
          >
          > "Carson Gross" <[email protected]> wrote in message
          > news:[email protected]...
          > > All,
          > >
          > > I have posted previously that custom tags can not handle JSP in their
          > > attributes. This turns out to be incorrect. In fact, they can, but
          > > there are some serious bugs when using it which made it seem like they
          > > couldn't.
          > >
          > > The following jsp works perfectly fine:
          > >
          > > <% String myAttribute="Thusly my attribute is" %>
          > > <mytaglib:mytag myattribute="<%=myAttribute%>" />
          > >
          > > However, the following jsp will break:
          > >
          > > <mytaglib:mytag myattribute="<%="Thusly my attribute is"%>" />
          > >
          > > because the jsp parser thinks that the second quote is ending the
          > > attribute instead of starting a string. Hence, the jsp compiler sees:
          > >
          > > <mytaglib:mytag myattribute="<%="
          > >
          > > and then some garbage including a > which it assumes means that mytag is
          > > closing. This really, really screws things up...
          > >
          > > The exact error I get is:
          > >
          > > /tagtester.jsp(38): no corresponding open tag for tag extension close:
          > >
          > > Now, I also get an error if I do something like this:
          > >
          > > <% String myAttribute="Thusly my attribute is" %>
          > > <mytaglib:mytag myattribute=" <%=myAttribute%>" />
          > >
          > > Where I have put some one space before the jsp. The error message is
          > > different:
          > > /_tagtester.java:84: String not terminated at end of line.
          > >
          > > Looking at the jsp .java file indicates that this also is a parsing
          > > problem...
          > >
          > > Is weblogic aware of these issues? Will they be fixed in sp6?
          > >
          > > Thanks,
          > > Carson
          > >
          >
          >

Custom Tags in JSP

I am new to using custom tags. Is there a nice book or site which I could read on custom tags.
Also, I kind of understand custom tags but not completely confident.
I have a JSP that uses two custom tags, flight and segment. Basically, goes through each segment with flight tag and prints out attribute of segment with Segment tag. The code looks like this.
<flifo:flight isParent="true" fromParent="true" >
          <td bgcolor="<%=bgcolor%>" width="94" valign="top" class="t7">
                    <%-- Print FLIGHT NUMBER --%>
               Flight
                    <b><flifo:segment fromParent="true" attribute="flight_num" /></b>
                    <br>
</flifo:flight>
In the above code I just have flight_num but there are other attributes that it prints out. I want to check an attribute in segment and if it is ture then display some of the tags. How can I do it?

This has helped me a lot in the past:
http://java.sun.com/developer/Books/javaserverpages/cservletsjsp/chapter14.pdf
... and the book it's extracted from is very good too.

Setter method not getitng called in the custom tag

Hi,
I have written a custom tag and I have declared an attribute in the tld file and have specified the setter method for the same in the java tag file but that setter method is not getting called...for rest of the attributes, the methods are getting called and not just for one!! any idea what could be the problem....
Regards
Deepak Saini

Do you have a getter method to match that property?
Post some example code - what does your tld define for this property, and what get/set methods have you defined for it?

Custom Tag Calling

Can someone describe the process that JSF Servers use to call a tag. I'm writing a custom tag (actually a library of them) and I need one to call another tag.
in other words:
instead of:
<my:tag1> <my:tag2>
i'm creating a class called my:tag3, that will call both my:tag1 and my:tag2.
That's the short of it, my:tag3 is actually going to do some nifty stuff on the back end, but thats not required for this question. So, how do I get my:tag3's encodeEnd(...) function to create my:tag1 and my:tag2 in the javacode?
Thanks for any help.

I'm writing a custom tag [...] and I need one to call another tag.
in other words:
instead of:
<my:tag1> <my:tag2>
i'm creating a class called my:tag3, that will call both my:tag1 and my:tag2.Do you really need JSP tags for <my:tag1> and <my:tag2>? A tag is just one way of creating a JSF component.
Another way is to associate (in faces-config.xml) a JSF component (of type UITag3) with the tag <my:tag3>. This UITag3 will have 2 sub-components, of type UITag1 and UITag2 and these components are created (and added to the UITag3 component) in the setProperties() method in UITag3Tag.
For example:
public class MyTag3Tag extends UIComponentTag {
    public String getComponentType() { return "my.tag3"; }
    public String getRendererType() { return null; }
    protected void setProperties(UIComponent component) {
        super.setProperties(component);
        List children = component.getChildren();
        UITag1 child1 = new UITag1();
        child1.setValue("XXX");
        children.add(child1);
        UITag2 child2 = new UITag2();
        child2.setValue("YYY");
        children.add(child2);
}Geoff Rimmer

Dynamic include in a custom tag, called from a jsp

Hello, I would like to be able to dynamically include other jsp's from within a custom tag that I create. is this possible?
in a jsp page i would just write <%@ include file="file.jsp" %> and all would be ok... but if i do an out.println( "<%@ include file=\"file.jsp\" %>" ); inside a custom tag bean then it doesn't work. it just prints out the command to the page as plain text.
I do understand why this is happening, but can anyone offer me a way around this problem?
Thanks in advance,
Randy

That's actually the same result as you get with a normal include - The method I suggested is a dynamic include similar to the <jsp:include> tag, not the <%@ include %> tag.
When you use a dynamic include, the included page is compiled and 'invoked' as serarately, and the result is what gets included, not the actual source. To get the behaviour you want would require an include directive (the <%@ include %> tag) which I don't think has an equivalence you can use inside a custom tag.
What you can do is pass attributes from the tag class like this:
pageContext.setAttribute(<name>, <object>, pageContext.REQUEST_SCOPE);
and then remove them after the include using pageContext.removeAttribute.
I'm not certain, but this implies that if you declare your variables with a <jsp:usebean> tag with request scope, instead of normal Java variable declarations, you should be able to use them in the page included by the custom tag.
*** in the jsp ***
<jsp:useBean id="myVar" scope="request" class="java.lang.String" />
<% myVar = "Something"; %>
// Now call the tag which uses the pageContext.include() mehtod.
*** end ***
*** in the include ***
<jsp:useBean id="myVar" scope="request" class="java.lang.String" />
<%= myVar + " something else" %>
*** end ***
Let me know if it works.

Custom Tag not evaluating expression in attribute

I have a custom tag that needs to take dynamic values in the attributes, but I can't seem to get the values "interpreted" correctly. I have the <rtexprvalue> tag set to "true" in my .tld file, which I thought was the only thing that was needed in order to accomplish what I am trying to do. However, that does not seem to be the case.
I am using WebLogic (8.1.4) and their <netui> tags, along with JSTL tags (1.0).
An example of what my code looks like is the following:
<test:myTag id="1" idx="<netui:content value='{container.index}' />">
<netui:select ... />
</test:myTag>and
<c:set var="myIdx" value="<netui:content value='{container.index}' />" />
<test:myTag id="1" idx="<c:out value='${myIdx}' />">
<netui:select ... />
</test:myTag>Neither of the above approaches has worked. In my code for my Tag.java file, I get the literal string values of <netui:content value='{container.index}' /> and <c:out value='${myIdx}' />, respectively, in my idx property.
Can someone give me any hints as to what I may be doing wrong?
Thanks.

Shouldnt that be
<netui:content value='${container.index}' />Actually, weblogic does not use the '$' prefix before
their expressions. Fine. Which in turn means weblogic has some custom expression evaluator.
Note weblogic 8.1
as a container doesnt implicitly supportexpressions
and you have to build in that feature into yourtag
library.Are you referring to the 'isELIgnored' attribute when
you mentioned the above statement? If not, can you
explain what you meant by "build that feature into
your tag library"?
It's like this - expression language is supported by default in all containers that implement the j2ee 1.4 spec (servlet 2.4/jsp 2.0). Additionally you should also declare your web application to adhere to the 2.4 standards (through the schema definition in web.xml). In applications that refer to the 2.3 dtd but are run on a 2.4 compliant container you can set the 'isELIgnored' attribute to false and use EL. This works because your container anyways supports it.
If your container doesnt provide support for EL (outside the jstl tags) as is the case with weblogic 8.1, then you can still use expressions by using something like the [url http://jakarta.apache.org/commons/el/]apache common evaluator package. The difference being that you will have to call the evaluator classes to evaluate the attribute.
Are there any alternatives that I could use to
accomplish what I am trying to do?Did the above answer your question?
ram.

Custom tag - setProperties() not called

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