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Kaj,

Kaj Kandler wrote:
> Hi there,
> I do have a library, that uses a property to determine some
> configuration. As a straight Java program I would call
> 
> java -dmy.property=/my/value ...
> 
> How can I set this property in the context of a tomcat webapp, like in
> the web.xml or context.xml?

Neither web.xml now context.xml will set system properties. You /can/
have either of these files stick things into the JNDI context, though.

See
http://tomcat.apache.org/tomcat-5.5-doc/config/globalresources.html#Environment
Entries

for more information.

If you /need/ to use system properties, you could write a
ServletContextListener to peek into JNDI and copy those values into he
system properties of the JVM. Just remember that system properties are
JVM-global, whereas JNDI resources are private to the application. If
you deploy two applications with different settings within the same JVM,
they will interfere with each other.

- -chris
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