CODEWITHSUNDEEP
javajarproperties
Anoop
Anoop

Reputation: 5720

Override a config.properties in a jar

I have executable jar file with its main class being specified in META-INF/MANIFEST.MF and one some of the properties specified in config.properties and folder/config.properties.

So the structure of my jar file is

./my-jar-with-dependencies.jar
|- com/mypackage/Main.class
|- META_INF/MANIFEST.MF 
|- config.properties
|- folder
|    |- config.properties
|     - system.properties
|- lib
|
..

What I want to achieve is execute the jar file as java -jar my-jar-with-dependencies.jar -Dconfig.properties=\path\to\new\config.properties_outside_the_jar and overriding the properties file within the jar.

Is this possible? If so how?

Note: I am not the one in control of how the jar is packaged, so changing the packaging of jar is not really an easy option

Upvotes: 1

Views: 4368

Answers (1)

JB Nizet
JB Nizet

Reputation: 691765

Just put a directory containing the properties files, with the same package structure, in the classpath, before the jar file:

./my-config-directory
|- config.properties
|- folder
     |- config.properties
      - system.properties

And use

java -cp ./my-config-directory:my-jar-with-dependencies.jar:dependency1.jar:dependency2.jar com.mypackage.Main

Note that a jar file is just a zip file. So you could also just unzip the jar file, replace the properties files, and zip again.

Upvotes: 4

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