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I have the derby jar files set in the classpath. This code has always
worked fine from any programs run from the command line but when I
package the code above into a jar file, it can't find the embedded
driver for Derby anymore, although the code works fine with Oracle DB
7.x, Sybase etc. I tried to set the jar files as run-time parameters as :
java -cp .;./derby.jar program.jar or
java -cp %classpath% program.jar
to no avail.
Hi,
>
>java -cp .;./derby.jar program.jar or
>java -cp %classpath% program.jar
>
Maybe I did not fully understand the above, but did you mean running the
main class from a jar file using something like
java -jar program.jar
with the manifest file of 'program.jar' having the 'Main-Class:'
defined ?
In that case, the Java classloader will ignore the CLASSPATH
environment variable setting or the -cp command-line argument. It
only loads classes from the main jar ('program.jar' in the above case)
and those specified in the manifest file.
I think the following are some possible ways to make it working:
1) Have you tried adding the 'derby.jar' as an entry to the 'Class-Path'
header of the Manifest file
Example:
Class-Path: lib/derby.jar
(note the path is with respect to the location of the jar being executed
i.e 'program.jar' in this case)
http://java.sun.com/developer/Books/javaprogramming/JAR/basics/manifest.html
2) Create one jar. I found this interesting article at IBM developerWorks
http://www-128.ibm.com/developerworks/java/library/j-onejar/
3) Using the Fat Jar Eclipse Plugin - http://fjep.sourceforge.net/
Hope the above helps.
-Rajesh
