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Java Forum / General / June 2005making sure a jar is self-contained
It there a utility that will trace dependencies to provide a list of all the classes that need to be included to create a free-standing jar? It is embarrassing to give folks a jar missing classes. The app works fine on your machine where the classes are available on the classpath. Obviously it can't find dynamically loaded stuff, but usually you know about that, and can use Jet to find those.  SignatureBush crime family lost/embezzled $3 trillion from Pentagon. Complicit Bush-friendly media keeps mum. Rumsfeld confesses on video. http://www.infowars.com/articles/us/mckinney_grills_rumsfeld.htm Canadian Mind Products, Roedy Green. See http://mindprod.com/iraq.html photos of Bush's war crimes [Roedy Green <look-on@mindprod.com.invalid>] | It is embarrassing to give folks a jar missing classes. The app | works fine on your machine where the classes are available on the | classpath. don't set the classpath -- don't assume anything about the environment. include everything in the application jar. write a manifest that identifies the main class. if it becomes 20Mb big it is still smaller than the average web browser and you don't usually hear anyone complaining about their disk footprint. (often it won't even be that big.) this means that if Java is installed all the user has to do to run the application is java -jar app.jar (modulo any options you'd need to pass along to the JVM anyway) no fiddling around. -Bjørn How about setting your classpath to nothing and try to run the code. But you said this "a free-standing jar". Do you mean one that you run with java -jar? If so then your classpath settings shouldn't come into the picture at all...and you wouldn't be asking this question. Assuming, of course, that you haven't inappropriately put any jars/classes into your JRE. John ["John Currier" <md4curvs@gmail.com>] | How about setting your classpath to nothing and try to run the code. the classpath environment variable should always be set to nothing. -Bjørn I agree, but doesn't his question imply otherwise? I definitely don't agree with you on bundling everything in one massive jar. I guess you've never written anything that runs against a generic database. My SchemaSpy (a runnable jar) would be MANY megabytes (vs. 88KB) if I tried to include every database driver I could think of into my jar. I'm not sure how you would expect someone to handle the various versions of drivers that exist for any given database vendor. John http://schemaspy.sourceforge.net ["John Currier" <md4curvs@gmail.com>] | I agree, but doesn't his question imply otherwise? | [quoted text clipped - 4 lines] | my jar. I'm not sure how you would expect someone to handle the | various versions of drivers that exist for any given database vendor. I am talking about self-contained applications where the dependencies are known up front. in this scenario a few megabytes of bytecode matters significantly less than people needing to ask "what jar provides..." N times before they get it to run. -Bjørn > It there a utility that will trace dependencies to provide a list of > all the classes that need to be included to create a free-standing > jar? You can use GenJar (http://genjar.sourceforge.net). It packages only the dependencies from starting point(s) you specify, like your main method. You can specify exceptions which have to be included etc. It hasn't been updated for a long time now and has some outstanding issues which should only affect exotic needs. It does its job very well otherwise. Mark. >It is embarrassing to give folks a jar missing classes. The app works >fine on your machine where the classes are available on the classpath. there are two issues. One is testing. That can be done by temporarily setting the classpath to empty. The other is figuring out what to put in the jar, rather than finding out one class at a time per test, or per JET compile. SignatureBush crime family lost/embezzled $3 trillion from Pentagon. Complicit Bush-friendly media keeps mum. Rumsfeld confesses on video. http://www.infowars.com/articles/us/mckinney_grills_rumsfeld.htm Canadian Mind Products, Roedy Green. See http://mindprod.com/iraq.html photos of Bush's war crimes >>It is embarrassing to give folks a jar missing classes. The app works >>fine on your machine where the classes are available on the classpath. [quoted text clipped - 4 lines] > The other is figuring out what to put in the jar, rather than finding > out one class at a time per test, or per JET compile. Try proguard: http://proguard.sourceforge.net It has other features as well (optimising, obfuscating), but it can be used as a pure "dependency follower". I use it to generate a complete self-contained jar for WebScarab, by sucking in only the classes required from the various jars I depend on. Regards, Rogan SignatureRogan Dawes *ALL* messages to discard@dawes.za.net will be dropped, and added to my blacklist. Please respond to "nntp AT dawes DOT za DOT net" Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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