Thanks Chris for your response.
It seems that you are thinking in the same direction that we had in mind.
About your suggestion to create a new class loader - this is the direction that
we started checking.
We considered the following:
1. Creating a new class, that extends WebappClassLoader.
2. Create an instance of this class, and copy all the configuration from the
wepassp's class loader. (Question to the forum - other than the URL's - what
other properties should we copy)?
3. Add the extra directory to the URLs
4. Load the class by name, using the new class loader.
Will this work?
Is there some example code for that?
(BTW, we are using Tomcat 5.5, in case it matters).
About your last question - the webapp loads an XML from an external directory,
which includes all configuration parameters.
Thanks
G.
On 07-Jul-10 22:36, Christopher Schultz wrote:
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Goren,
On 7/6/2010 10:51 AM, Goren Il wrote:
There are 2 issues (not in order of priority):
1. The steps are not straight forward, and may cause the system to stop
working (the customer should change the WAR suffix to "zip", open it,
add the files and rename it back)
There isn't really a reason why the above shouldn't work.
2. When we provide a new version, we will replace the WAR and all the
changes are gone.
Fair enough, but the customer can re-install their plug-ins.
Another option is to implement your own ClassLoader that scans a
directory (such as /my/great/plugins) for JAR files and will load them
alongside your webapp's classes.
You'll either have to chain that ClassLoader into the standard webapp
ClassLoader provided by Tomcat for transparent class-loading by your
webapp, or write a wrapper for plug-in loading and execution by
explicitly managing and invoking that ClassLoader as necessary.
You should seriously consider how to implement security mechanisms when
loading classes that you do not provide yourself.
I would like my webapp to call an external class, which will be
provided (as a name) in an XML file at run time.
How does your webapp load this XML file if it isn't packaged in the WAR
file?
- -chris
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