Easiest way to merge a release into one JAR file
Solution 1
Eclipse 3.4 JDT's Runnable JAR export wizard.
In Eclipse 3.5, this has been extended. Now you can chose how you want to treat your referenced JAR files.
Solution 2
Ant's zipfileset
does the job
<jar id="files" jarfile="all.jar">
<zipfileset src="first.jar" includes="**/*.java **/*.class"/>
<zipfileset src="second.jar" includes="**/*.java **/*.class"/>
</jar>
Solution 3
Having tried a few different solutions, I found One-JAR the easiest to work with, and have managed to make do exactly that: produce a single, executable JAR which contains everything I need.
One-JAR uses a custom class-loader which can navigate nested resources. Look at the .bat file in the download, it looks like org.codelutin.jrst.JRST in the jrst-0.8.1.jar is the main class, so your manifest should look like this:
Main-Class: com.simontuffs.onejar.Boot
One-Jar-Main-Class: org.codelutin.jrst.JRST
The really cool thing is that One-JAR will handle passing on command-line arguments for you. The classpath is handled by the custom class loader, assuming all the resources you need are bundled into the single JAR.
The easiest way to use One-JAR is with ant; there's a custom "one-jar" ant task which works as follows (assuming your manifest is called "rst.mf"):
<target name="jar-rst">
<one-jar destfile="rst.jar" manifest="rst.mf">
<main jar="jrst-0.8.1.jar" />
<lib>
<fileset dir="${pathToJars}">
<include name="batik-util-1.6-1.jar" />
<include name="icu4j-2.6.1.jar" />
<include name="commons-collections-3.1.jar" />
<!-- Snip -->
</fileset>
</lib>
</one-jar>
</target>
Solution 4
If you are a Maven user, typically the assembly plugin do what you want, or potentially the shade plugin, and in some cases a combination.
With the assembly plugin you put a manifest file in your project with any necessary settings, although the defaults are usually quite good. Building is then done with
mvn assembly:assembly
Or if you have more special things to deal with, one of the other goals. All JAR files to include, are picked up by Maven's dependency resolver. If you use the shade plugin, it is typically part of the install goal, and in one particular project I'm doing now I do
mvn install
mvn assembly:single
The assembly:single
goal is to work around lifetime issues, in this case in a Spring application.
Solution 5
There is ProGuard which does not only pack your JAR files into one, but it can also optimize, cleanup or obfuscate your class files, making the resulting JAR file much smaller than the sum of all JAR files before.
I actually tried ProGuard with the JRST tool, and it is as you reported. I tried to track the problem down and found it to relate to a bug in the ICU4J library referenced by jrst. The problem is, that the used ICU version is far outdated right now. So I replaced the icu.jar
file with ICU4J version 3.2. Now ProGuard finds a bunch of other errors/warnings about incosistencies with the libraries of JRST.
My guess is that ProGuard works as expected, but the libraries of jrst are just not consistent. I don't know if you can do much more than talk with its developers since they should check and update the dependencies of the project.
Comments
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tovare almost 2 years
Is there a tool or script which easily merges a bunch of JAR files into one JAR file? A bonus would be to easily set the main-file manifest and make it executable.
The concrete case is a Java restructured text tool. I would like to run it with something like:
java -jar rst.jar
As far as I can tell, it has no dependencies which indicates that it shouldn't be an easy single-file tool, but the downloaded ZIP file contains a lot of libraries.
0 11-30-07 10:01 jrst-0.8.1/ 922 11-30-07 09:53 jrst-0.8.1/jrst.bat 898 11-30-07 09:53 jrst-0.8.1/jrst.sh 2675 11-30-07 09:42 jrst-0.8.1/readmeEN.txt 108821 11-30-07 09:59 jrst-0.8.1/jrst-0.8.1.jar 2675 11-30-07 09:42 jrst-0.8.1/readme.txt 0 11-30-07 10:01 jrst-0.8.1/lib/ 81508 11-30-07 09:49 jrst-0.8.1/lib/batik-util-1.6-1.jar 2450757 11-30-07 09:49 jrst-0.8.1/lib/icu4j-2.6.1.jar 559366 11-30-07 09:49 jrst-0.8.1/lib/commons-collections-3.1.jar 83613 11-30-07 09:49 jrst-0.8.1/lib/commons-io-1.3.1.jar 207723 11-30-07 09:49 jrst-0.8.1/lib/commons-lang-2.1.jar 52915 11-30-07 09:49 jrst-0.8.1/lib/commons-logging-1.1.jar 260172 11-30-07 09:49 jrst-0.8.1/lib/commons-primitives-1.0.jar 313898 11-30-07 09:49 jrst-0.8.1/lib/dom4j-1.6.1.jar 1994150 11-30-07 09:49 jrst-0.8.1/lib/fop-0.93-jdk15.jar 55147 11-30-07 09:49 jrst-0.8.1/lib/activation-1.0.2.jar 355030 11-30-07 09:49 jrst-0.8.1/lib/mail-1.3.3.jar 77977 11-30-07 09:49 jrst-0.8.1/lib/servlet-api-2.3.jar 226915 11-30-07 09:49 jrst-0.8.1/lib/jaxen-1.1.1.jar 153253 11-30-07 09:49 jrst-0.8.1/lib/jdom-1.0.jar 50789 11-30-07 09:49 jrst-0.8.1/lib/jewelcli-0.41.jar 324952 11-30-07 09:49 jrst-0.8.1/lib/looks-1.2.2.jar 121070 11-30-07 09:49 jrst-0.8.1/lib/junit-3.8.1.jar 358085 11-30-07 09:49 jrst-0.8.1/lib/log4j-1.2.12.jar 72150 11-30-07 09:49 jrst-0.8.1/lib/logkit-1.0.1.jar 342897 11-30-07 09:49 jrst-0.8.1/lib/lutinwidget-0.9.jar 2160934 11-30-07 09:49 jrst-0.8.1/lib/docbook-xsl-nwalsh-1.71.1.jar 301249 11-30-07 09:49 jrst-0.8.1/lib/xmlgraphics-commons-1.1.jar 68610 11-30-07 09:49 jrst-0.8.1/lib/sdoc-0.5.0-beta.jar 3149655 11-30-07 09:49 jrst-0.8.1/lib/xalan-2.6.0.jar 1010675 11-30-07 09:49 jrst-0.8.1/lib/xercesImpl-2.6.2.jar 194205 11-30-07 09:49 jrst-0.8.1/lib/xml-apis-1.3.02.jar 78440 11-30-07 09:49 jrst-0.8.1/lib/xmlParserAPIs-2.0.2.jar 86249 11-30-07 09:49 jrst-0.8.1/lib/xmlunit-1.1.jar 108874 11-30-07 09:49 jrst-0.8.1/lib/xom-1.0.jar 63966 11-30-07 09:49 jrst-0.8.1/lib/avalon-framework-4.1.3.jar 138228 11-30-07 09:49 jrst-0.8.1/lib/batik-gui-util-1.6-1.jar 216394 11-30-07 09:49 jrst-0.8.1/lib/l2fprod-common-0.1.jar 121689 11-30-07 09:49 jrst-0.8.1/lib/lutinutil-0.26.jar 76687 11-30-07 09:49 jrst-0.8.1/lib/batik-ext-1.6-1.jar 124724 11-30-07 09:49 jrst-0.8.1/lib/xmlParserAPIs-2.6.2.jar
As you can see, it is somewhat desirable to not need to do this manually.
So far I've only tried AutoJar and ProGuard, both of which were fairly easy to get running. It appears that there's some issue with the constant pool in the JAR files.
Apparently jrst is slightly broken, so I'll make a go of fixing it. The Maven
pom.xml
file was apparently broken too, so I'll have to fix that before fixing jrst ... I feel like a bug-magnet :-)
Update: I never got around to fixing this application, but I checked out Eclipse's "Runnable JAR export wizard" which is based on a fat JAR. I found this very easy to use for deploying my own code.
Some of the other excellent suggestions might be better for builds in a non-Eclipse environment, oss probably should make a nice build using Ant. (Maven, so far has just given me pain, but others love it.)
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tovare almost 16 yearsThanks! i downloaded it and tried, but in this particluar field it bombed with unknown constant field on icu4j-2.6.1.jar,
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matbrgz over 14 yearsCould you check if the ant scripts generated are usable? There was an issue earlier with absolute filepaths instead of relative.
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matbrgz over 14 yearsThe scriptability of one-jar with ant makes it usable in continuous build systems.
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MRalwasser about 12 years1. Is One-JAR capable if there are several applications (several entry point classes) inside my jar? 2. What if this jar is used by another application, can it also use the classes in nested jars inside the "One-JAR"?
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Shirkrin about 12 years+1 since this also allows one to add <manifest/> tags and set the main class.
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Frans Lundberg over 10 yearsWould it be possible to do this for all jar files in a directory somehow. Would be very neat. Avoid need to update build.xml when libraries change.
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Anupam Saini over 10 yearsTry this approach you won't have to worry about addition of new jars: github.com/anupamsaini/Trie/blob/master/src/build.xml#L42