where can I find a sample code demonstrating how to lookup a service in fortress

[李 越]

in ECM, I use only ComponentManager and ComponentSelector and roles files 
to do this, yet in fortress, I have the following questions

1>why there is an org.apache.avalon.fortress.Container in fortress? what is 
this Container for? because I think what ComponentManager and 
ComponentSelector do in ECM can be totally done by SericeManager and 
ServiceSelector that are encouraged to use in fortress, and, besides, what 
is ComponentHandler for in fortress, how to use it

2> It mentions in 'Use meta info' on fortress page on avalon site that the 
'roles' files are not encouraged to use in fortress, instead, fortress use 
javadoc meta information to get meta information for a Service,I did the 
following:

this is my build.xml file

<?xml version="1.0" encoding="GB2312" ?> 
<project default="dist" basedir="."> 
<property environment="env"/> 
<property name="java.home" value="${env.JAVA_HOME}"/> 
<property name="ant.home" value="${env.ANT_HOME}"/> 
 
<property name="src.dir" value="src"/> 
<property name="build.dir" value="build" /> 
<property name="build.classes" value="${build.dir}/classes"/> 

<taskdef name="collect-metainfo" 
classname="org.apache.avalon.fortress.tools.C 
omponentMetaInfoCollector"> 
   <classpath> 
       <pathelement location="fortress-tools.jar"/> 
       <pathelement location="qdox-1.3.jar"/> 
   </classpath>     
</taskdef> 

<target name="compile" description="Compiles the source code"> 
   <mkdir dir="${build.classes}"/> 
   <javac srcdir="${src.dir}" 
          destdir="${build.classes}"> 
     <classpath> 
       <fileset dir="." includes="*.jar"/> 
       <pathelement location="${java.home}"/> 
       <pathelement location="${ant.home}"/> 
     </classpath> 
   </javac> 
   <collect-metainfo destdir="${build.classes}"> 
     <fileset dir="${src.dir}"/> 
   </collect-metainfo> 
</target> 
</project>  

and I put these jar files in the "." (current dir) directory
in  the /src dir , I have two files got from 
excalibur-fortress-1.0\examples\src\java\org\apache\avalon\fortress\examples\components

they are Translator.java and TranslatorImpl.java

avalon-framework-4.1.4.jar 
excalibur-fortress-complete-1.0.jar 
fortress-tools.jar 
qdox-1.3.jar 

I ran the build file and got the exception:



java.lang.IncompatibleClassChangeError 
       at 
org.apache.avalon.fortress.tools.Component.<init>(Component.java:12 
4) 

       at 
org.apache.avalon.fortress.tools.ComponentMetaInfoCollector.collect 
In 
foMetaData(ComponentMetaInfoCollector.java:226) 
       at 
org.apache.avalon.fortress.tools.ComponentMetaInfoCollector.execute 
(C 
omponentMetaInfoCollector.java:122) 
       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) 

Total time: 2 seconds 
java.lang.IncompatibleClassChangeError 
       at 
org.apache.avalon.fortress.tools.Component.<init>(Component.java:12 
4) 

       at 
org.apache.avalon.fortress.tools.ComponentMetaInfoCollector.collect 
In 
foMetaData(ComponentMetaInfoCollector.java:226) 
       at 
org.apache.avalon.fortress.tools.ComponentMetaInfoCollector.execute 
(C 
omponentMetaInfoCollector.java:122) 
       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) 

When I did this , I just tried to see what files the 
ComponentMetaInfoCollector can generate and how they differ from the 
orginal roles files of ECM.

So anyone can be so nice to tell me why the exceptions occured?



3> what is the MetaInfoManager for in fortress? how to use it? and why 
there is still a RoleManage in fortress? is it still of use?

I m sorry to ask so many 'simple' questions, yet I m really at a loss to 
know how to transfer my code that exploits ECM to code using fortress idea.

Thanks

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