How can I add a .jar file dependencies when building it with the command line tool?

Question

Pretty straightforward question. Can it be done without the use of Ants or Maven? (And by that, I mean the command line tool specifically)

Please notice that I don't want to create an uberjar, I just want the archived unit to "know" where its external dependencies are.

Answer 1

You can make it through META-INF/MANIFEST.MF. You can add other jars to the classpath like this:

Manifest-Version: 1.0
Main-Class: org.domain.MyMainClass
Class-Path: lib/slf4j-log4j12-1.5.8.jar lib/slf4j-api-1.5.8.jar

I believe, that it works only if you define Main-Class and start your application like this:

java -jar my-app.jar

Also notice, that classpath paths are relative to the main jar. So in my example directory structure should look like this:

• my-app.jar
• lib
  • slf4j-log4j12-1.5.8.jar
  • slf4j-api-1.5.8.jar

Answer 2

Presuming you're talking about a command line invocation of javac, what you're talking about is "can I provide libraries as arguments to javac to fulfill requirements during compilation".

Top entry for man javac says

   -classpath classpath
          Sets  the user class path, overriding the user class path in the
          CLASSPATH environment variable.  If neither CLASSPATH or -class-
          path  is  specified, the user class path consists of the current
          directory.  See Setting the Class Path for more details.

Effectively I suspect you just need to say

javac -classpath path/to/library1.jar Main.java