Classloader issues?

[Johann Uhrmann]

Hello,

I have some trouble in defining an additional task in
the following snippet of my build.xml:
<path id="jasper2" >
 <pathelement location="${catalina.home}/common/lib/servlet.jar" />
 <pathelement location="${java.home}/../lib/tools.jar"/>
 <fileset dir="${catalina.home}/server/lib">
  <include name="*.jar"/>
 </fileset>
 <fileset dir="${catalina.home}/common/lib">
 <include name="*.jar"/>
  <exclude name="servlet.jar" />
 </fileset>
</path>
<property name="debugpath" refid="jasper2" />
<echo message="${debugpath}" />
                
<taskdef classname="org.apache.jasper.JspC" name="jasper2">
 <classpath refid="jasper2" />  
</taskdef>
Ant complains about not being able to load the JspC class because
the class javax.servlet.ServletContext is referenced by it and
cannot be found. However, the echo-Task shows that servlet.jar
(which contains ServletContext) is the first jar file in the
"jasper2" path.
The stack trace is attached.
If the classpath that is printed by the echo-task is added to
the CLASSPATH environment variable, then the task can be loaded.
How to configure ant that it uses the specified class path to
locate the classes that are referenced by a task class?
Kind regards,

Johann Uhrmann

Stack trace:

BUILD FAILED
file:/home/hans/src/services1/build.xml:96: taskdef class 
org.apache.jasper.JspC cannot be found
        at 
org.apache.tools.ant.taskdefs.Definer.addDefinition(Definer.java:240)
        at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:162)
        at org.apache.tools.ant.Task.perform(Task.java:341)
        at org.apache.tools.ant.Target.execute(Target.java:309)
        at org.apache.tools.ant.Target.performTasks(Target.java:336)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1339)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1255)
        at org.apache.tools.ant.Main.runBuild(Main.java:609)
        at org.apache.tools.ant.Main.start(Main.java:196)
        at org.apache.tools.ant.Main.main(Main.java:235)
Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext
        at java.lang.Class.getDeclaredConstructors0(Native Method)
        at java.lang.Class.privateGetDeclaredConstructors(Class.java:1590)
        at java.lang.Class.getDeclaredConstructors(Class.java:1152)
        at 
org.apache.tools.ant.AntClassLoader.initializeClass(AntClassLoader.java:479)
        at 
org.apache.tools.ant.taskdefs.Definer.addDefinition(Definer.java:231)
        ... 9 more
--- Nested Exception ---
java.lang.NoClassDefFoundError: javax/servlet/ServletContext
        at java.lang.Class.getDeclaredConstructors0(Native Method)
        at java.lang.Class.privateGetDeclaredConstructors(Class.java:1590)
        at java.lang.Class.getDeclaredConstructors(Class.java:1152)
        at 
org.apache.tools.ant.AntClassLoader.initializeClass(AntClassLoader.java:479)
        at 
org.apache.tools.ant.taskdefs.Definer.addDefinition(Definer.java:231)
        at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:162)
        at org.apache.tools.ant.Task.perform(Task.java:341)
        at org.apache.tools.ant.Target.execute(Target.java:309)
        at org.apache.tools.ant.Target.performTasks(Target.java:336)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1339)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1255)
        at org.apache.tools.ant.Main.runBuild(Main.java:609)
        at org.apache.tools.ant.Main.start(Main.java:196)
        at org.apache.tools.ant.Main.main(Main.java:235)



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