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Creating an executable JAR  RSS feed

 
Graeme Byers
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I want to create an executable JAR from Message.class and Hello.class both in C:\GBJAVA\ClassLib\English\com\hotmail.graemebyers
Here is the source :


The manifest C:\Manifest.txt contains this line :
Main-Class: com.hotmail.graemebyers.Message

It seems that to do this the directory containing the .class(s) must be made the current directory as indicated by . (dot)
C:\GBJAVA\ClassLib\English>jar cvmf C:\Manifest.txt C:\Message.jar .

C:\GBJAVA\ClassLib\English>java -jar c:\Message.jar // OK : prints Message , Hello

C:\GBJAVA\ClassLib\English>jar -tvf c:\Message.jar // Looks OK


BUT if I include the class directory then it is included in the jar :

C:\GBJAVA\ClassLib\English>jar cvmf c:\Manifest.txt c:\Message.jar C:\GBJAVA\ClassLib\English
C:\GBJAVA\ClassLib\English>java -jar c:\Message.jar // NoClassDefFoundError : com/hotmail/graemebyers/Message
C:\GBJAVA\ClassLib\English>jar -tvf c:\Message.jar


If I rename c:\JAVA to c:\JAVAXXX then jar -xf extract will recreate the appropriate directories - OK.

FINALLY - my questions :
1. Should I put directory info in a jar ?
2. How do I execute a jar if I put directory info in it ?
3. What do real-life "production" JARs contain ?

Nice work on the site
 
Campbell Ritchie
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Welcome to JavaRanch.

you should be able to get simple .jars to execute by writing the name of the class with the main method in their manifest file. I presume you have been through the Java Tutorials?

By the way: are you actually allowed to use com.hotmail as a package name? There are conventions about package names.
 
Consider Paul's rocket mass heater.
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