A jar loads a file that is packaged inside the jar itself by using getResourceAsStream.
Is it possible to replace/override that file when running java -jar without modifying the jar itself?
Is it possible to override a file that is loaded by getResourceAsStream when running a jar?
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A jar file just an archive. You could update it with a
jar --updatetool, which is a part of jdk. It may not work if the jar is signed.Alternatively you could look into (using the
jartool) the jar-file to figure out what is a main class (findMain-Class:in theMETA-INF/MANIFEST.MF). Then run the jar file specifying classpath explicitlyjava -classpath path-with-your-file:theApp.jar.