Modifying a file inside a jar

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You can use the u option for jar

From the Java Tutorials:

jar uf jar-file input-file(s)

“Any files already in the archive having the same pathname as a file being added will be overwritten.”

See Updating a JAR File.

Much better than making the whole jar all over again. Invoking this from within your program sounds possible too. Try Running Command Line in Java

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