In your Context definition you can state which files should be watched
for changes.

<WatchedResource>WEB-INF/web.xml</WatchedResource>
<WatchedResource>WEB-INF/lib/worker.jar</WatchedResource>

p

hanasaki wrote:
> If you go this way... remember the following
>
> ClassLoader cl1 = new URLClassLoader(urls);
> Class cls1 = cl1.loadClass("classPath");
>
> ClassLoader cl2 = new URLClassLoader(urls);
> Class cls2 = cl2.loadClass("classPath");
>
> cls1 == cls2 <=== FALSE not TRUE as you might expect
>
> Johnny Kewl wrote:
>> This is the kind of thing tomcat cant really do for you.... and it
>> depends very much on the sophistication needed.
>> One dirty trick, is to change the web.xml file slightly, when TC gets a
>> little quiet time it will reload the whole web app, ie when its able to
>> shed all classes.... dont really recommend it, but I have used it in the
>> past.
>>
>> More sophisticated method is to read up on
>> ClassLoader cl = new URLClassLoader(urls);
>> Class cls = cl.loadClass("classPath");
>> ie your program determines when it needs the new class, could do this by
>> checking the last modified time of the file attribute....
>>
>> have fun
>>
>>
>>
>> ----- Original Message ----- From: "santa T" <shaoanqing@(protected)>
>> To: <users@(protected)>
>> Sent: Tuesday, July 10, 2007 2:18 AM
>> Subject: How to replace jar which was already loaded?
>>
>>
>>> Hi
>>> I have a "worker.jar" in my webapp. User could upload a new "worker.jar"
>>> replacing it. And I don't want to restart the tomcat.
>>> How can I implement this?
>>>
>>> Thanks.
>>>
>>
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>>
>
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>