Your task doesnt have a reference to your project, therefore
  task.getProject() returns null

Try setting the project reference
  task.setProject(project);
  task.execute();


Maybe you want to have a look at Leafcutter
https://leafcutter.dev.java.net/


Jan


> -----Ursprüngliche Nachricht-----
> Von: Paolo [mailto:paolo@(protected)]
> Gesendet: Dienstag, 15. April 2008 17:35
> An: user@(protected)
> Betreff: NullPointerException with ant Javac() api
>
> Hello,
> I'm new to ant api. i would like to compile a source from my
> application, and i wrote the method below.
>
> When i execute it, i get a NullPointerException at
> org.apache.tools.ant.taskdefs.Javac.execute (Javac.java:807)
>
> where it says: File srcDir = getProject().resolveFile(list[i]);
> (it's on the last instruction of this snippet, task.execute())
>
> so i guess i screwed up with all the Path stuff..
> But how to create and set up a Path object to feed Javac object?
> thanks in advance,
> Paolo
>
>
>
>  public void subsystemCreate(String id, String poolSize) {
>  
>    String beanName = "BpsAgent"+id;
>    String jbossHome =
> System.getProperty("jboss.home.dir"+"/"); String serverHome =
> System.getProperty("jboss.server.home.dir"+"/"); String tmpDir =
> System.getProperty("jboss.server.home.dir")+"/deploy/"+appName
> +".ear/tmp/src/com/mersy/batch/mdb/";
> String appDir =
> System.getProperty("jboss.server.home.dir")+"/deploy/"+appName
> +".ear/";
> String src =
> System.getProperty("jboss.server.home.dir")+"/deploy/"+appName
> +".ear/tmp/src/";
> String dst =
> System.getProperty("jboss.server.home.dir")+"/deploy/"+appName
> +".ear/tmp/bin/";
> System.out.println(beanName); System.out.println(jbossHome);
> System.out.println(serverHome); System.out.println(tmpDir);
>    System.out.println(appDir);
>    System.out.println(src);
>    System.out.println(dst);
>    
>    
>    boolean success = (new File(tmpDir)).mkdirs();
>     if (!success) {
>       System.out.println("Megaerrore1");
>       return ;
>     }
>    
>    File dstPath=new File(dst);
>    success = (dstPath.mkdirs());
>     if (!success) {
>       System.out.println("Megaerrore2");
>       return ;
>     }
>    
>     createMdb(id,poolSize,tmpDir);
>    
>    
>    Project project = new Project();
>    Path path = new Path(project);
>    path.setPath(jbossHome+"/lib/hibernate3.jar;" +
>        serverHome+"/lib/ejb3-persistence.jar;"
> + serverHome+"/lib/hibernate-annotations.jar;"+
>        serverHome+"/lib/jboss-remoting.jar;"+
>        
> serverHome+"/deploy/ejb3.deployer/jboss-ejb3.jar;"+
>        
> serverHome+"/deploy/ejb3.deployer/jboss-ejb3x.jar;"+
>        
> serverHome+"/deploy/ejb3.deployer/jboss-annotations-ejb3.jar;"+
>        appDir+"/locallib/javaee.jar;"+
>        appDir+"/locallib/a001llayer.jar;"+
>        serverHome+"/lib/log4j.jar");
>    
>    Path srcPath=new Path(project);
>    srcPath.setPath(src);
>    
>
>    
>    Javac task = new Javac();
>    
>    task.setSrcdir(srcPath);
>    task.setDestdir(dstPath);
>    task.setClasspath(path);
>    
>    task.execute();
>
>
>
>
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