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Editorial Team
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Asked: 2026-05-24T18:29:25+00:00

I have an executable jar file (A.jar), built with Eclipse, that relies on other

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I have an executable jar file (A.jar), built with Eclipse, that relies on other jar files (B.jar) that are included in the jar file, and accessed via the jarinjarloader. While this works to access the java code inside those jar files, when that code calls

InputStream inStream = <Class>.getClassLoader().getResourceAsStream(propFile);

it fails to find the properties file contained in B.jar. The code works when run in Eclipse, so I know the correct properties files are there.

I tried extracting A.jar, then extracting B.jar, and then zipping up the combined files, but this does not work. Looking at the Manifest file, the Main-Class is org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader

Is there some change I can make to the Manifest file (say, adding something to Rsrc-Class-Path) that will get this to work? Rsrc-Class-Path includes “./” already, but that clearly isn’t letting the properties loader see my properties files.

TIA,

Greg

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1 Answer

  1. Editorial Team

    Turns out Eclipse has a setting I missed. When Exporting a “Runnable JAR File” you can select “Extract required libraries into generated JAR“. while this may give some license issues (depending upon the JARs you’re merging in), in my case it worked like a charm, giving me a single (smaller, since there were a lot of duplicates among the various jar files I’d been including) jar that actually worked.

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