include external jar when running java -jar
Solution 1
Is there a reason why you are avoiding invoking the main class like
java -cp /usr/local/jar/foobar.jar:/some/other/path.jar com.your.main.classname
?
This type of invocation allows you to mix absolute paths with relative paths. Put this into a shell script or batch file to avoid having to actually type or remember the full classpath to simplify things.
Solution 2
You can create a folder, say lib, within the folder where you have the jar file.
Manifest.MF contents can be:
Main-Class: com.mastergaurav.test.app.MainClass
Class-Path: lib/one.jar lib/two.jar
Folder contents:
mainFolder/
* lib/one.jar
* lib/two.jar
* my-main.jar
To execute:
java -jar my-main.jar
rouble
Dad of twins. Boilermaker. Tech guy. Coffee addict. Home automation hobbyist. Might very well be an alien.
Updated on July 09, 2022Comments
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rouble almost 2 years
From my readings, when you execute a command as follows:
java -jar foo.jar
Then the main classpath is ignored, and the classpath is taken from the manifest file.
Further, the classpath declared on the command line is also ignored. So in:
java -classpath /usr/local/jar/foobar.jar -jar foo.jar
/usr/local/jar/foobar.jar is ignored.
Lastly, I have read that the manifest file can only contain relative paths, within the jar file.
So, how do you include absolute paths to external jars, that are present on the system, but not in the jar file being executed?
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gvaish almost 14 yearsbtw, if you execute java -cp /addtional/class/path -jar abcd.jar, the addtional classpath will not be ignored.
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Andreas Dolk almost 14 years+1 for this practical advise! Oracle/SUN should really deprecate the -jar option... it's a reoccurring nightmare...
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matt b almost 14 yearsWell using
-jar
can be significantly easier in some scenarios, but if you find that the simplified option is giving you trouble then it always makes sense to fallback to the option that gives you total control -
Bogdan almost 13 yearsYou have absolutely no idea how long I've searched for this. Thanks.
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Aaron Esau over 7 yearsHow do I set the
Class-Path
to a jar inside of the jar I want to compile? -
Shea almost 6 years@Arin to my knowledge this is not possible without writing a custom class loader. Even then, it seems impossible based on a day and a half long spike. See AlikElzin-kilaka's comment above and bugs.java.com/bugdatabase/view_bug.do?bug_id=4648386. Of course you could explore One-Jar.
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GKalnytskyi about 5 yearsI think, there should be a semicolon on Windows instead of the colon between jar paths. Please check these answers stackoverflow.com/a/219801/761755 stackoverflow.com/a/13018244/761755