Question

We have an ant build script for a project we’re developing for a PDA. In eclipse we have a load of referenced libraries and I know how to get them to work when we run the jar on the PDA because we have a .lnk file where you can add the external libraries simply by adding the following:

512#'\J9\PPRO11\bin\j9.exe' -jcl:ppro11 -cp '\dist\WiFiTest.jar;\placelab\lib\placelab.jar' j2medemo.wifi.WiFiTest 

Adding whatever libraries we need after the -cp argument. However, I have no idea how to replicate this in the ant file (no idea is actually an exaggeration but after reading all the documentation I still don’t understand it).

We have the following .

<target name='jar' depends='prepare'>  <delete file='${dist}/${appname}.jar'/>  <delete file='${dist}/MANIFEST.MF'/>  <manifest file='${dist}/MANIFEST.MF'>     <attribute name='Built-By' value='${user.name}'/>     <attribute name='Main-Class' value='j2medemo.GUI.MapPanel'/> </manifest> <jar destfile='${dist}/${appname}.jar'      basedir='${classes}'      includes='**/*.class, **/*.jpg, **/*.gif,**/*.png,**/*.xml'      manifest='${dist}/MANIFEST.MF'      /> </target> 

I have tried adding everywhere I can think of but it doesn’t help. Can I just add it to the the include part?

Secondly, we have a run target:

<target name='run' description='run' depends='jar'>     <exec dir='${j9bin}' executable='${j9bin}\j9.exe'>         <arg line='-jcl:ppro11 -cp '${dist}\${appname}.jar;placelab\lib\placelab.jar' ${mainclass}'/>         <env key='JAVA_HOME' path='${j9home}'/>     </exec> </target> 

And I wanted to change it to run a different class so I created the following two targets:

<target name='jarSAX' depends='prepare'>  <delete file='${dist}/SAXParse.jar'/>  <delete file='${dist}/MANIFEST.MF'/>  <manifest file='${dist}/MANIFEST.MF'>     <attribute name='Built-By' value='${user.name}'/>     <attribute name='Main-Class' value='j2medemo.Routes.SAXParse'/> </manifest> <jar destfile='${dist}/SAXParse.jar'      basedir='${classes}'      includes='**/*.class, **/*.jpg, **/*.gif,**/*.png,**/*.xml'      manifest='${dist}/MANIFEST.MF'      /> </target> 

And

<target name='runSAXParser' description='run' depends='jarSAX'>         <exec dir='${j9bin}' executable='${j9bin}\j9.exe'>             <arg line='-jcl:ppro11 -cp '${dist}\SAXParse.jar' j2medemo.Routes.SAXParse'/>             <env key='JAVA_HOME' path='${j9home}'/>         </exec>     </target> 

But if I try and run this I get the following error:

Exception in thread 'main' java.lang.NoClassDefFoundError: j2medemo.Routes.SAXParse 

If anyone has any ideas/solutions for either questions that would be most helpful.

Answer 1

From what I can tell, you need to add the classpath elements to the manifest. Should look something like this:

 <manifest file='${dist}/MANIFEST.MF'>     <attribute name='Built-By' value='${user.name}'/>     <attribute name='Main-Class' value='j2medemo.Routes.SAXParse'/>     <attribute name='Class-Path' value='WiFiTest.jar;placelab.jar'/>  </manifest> 

The classpath entries should be relative to the location of the Jar in the distributable. From there, you should be able to execute the jar directly (using the -jar command line option, I’m not sure what this is for J9). Should be similar to the analogous Java call:

java -jar MainJar.jar