On 1/6/15 11:09 PM, Varun Sawaji wrote:
Hi,
I have application which was developed using Java and Apache Derby. I
want to create executable JAR and run on any system which doesnot have
derby DB.When I click on Jar file the derby also install on the
system. Is it possible.
Varun
Hi Varun,
A common solution to this problem is to put your application in a zip
file which has the following shape:
1) a top level directory containing your application jar file.
2) a subdirectory (called, say "lib") which contains all of the 3rd
party jar files needed by your application.
3) the manifest in your application jar file should contain a Class-Path
declaration which wires together all of the 3rd party jar files needed
by your application.
Installing the application consists of unzipping the zip file. Running
the application consists of clicking on the application jar file.
If you pursue the approach of unpacking the 3rd party jar files and then
jar'ing up the result together with your application classes, then be
aware of the following problems:
i) All of your classes are now in the same security codebase. This will
make it harder for you to grant specific permissions to your application
and specific permissions to your 3rd party libraries.
ii) If any of your 3rd party jar files contain services (like the JDBC
drivers in derby.jar and derbyclient.jar), then your META-INF manifest
directory will need to contain a file called "services", which contains
the names of all of those services. Otherwise, autoloading of services
(including autoloading of the Derby JDBC drivers) will not work.
Hope this helps,
-Rick
