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I am currently working on a J2ME polish application, just enhancing it. I am finding difficulties to get the exact version of the jar file. Is there any way to find the version of the jar file for the imports done in the class? I mean if you have some thing, import x.y.z; can we know the version of the jar x.y package belongs to?
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JAR file is a file format based on the popular ZIP file format and is used for aggregating many files into one. A JAR file is essentially a zip file that contains an optional META-INF directory.
Jar files are archive files that contains of a lot of different java classes (files). You can use winzip/winrar to open the jar files and you can see those java classes in jar files. Typically you can use a Java decompiler to decompile the class file and look into the source code.
Decompress the JAR file and look for the manifest file (META-INF\MANIFEST.MF). The manifest file of JAR file might contain a version number (but not always a version is specified).
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You need to unzip it and check its META-INF/MANIFEST.MF file, e.g.
unzip -p file.jar | head or more specific:
unzip -p file.jar META-INF/MANIFEST.MF If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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