New Ant Task Problem

[Rhonda Brown]

Hi

I have written a small Ant Task to amend the format of the version number so that it will use the last 4 digits after the last period to tag the source files.

Example: tag `Ver_release_1.0.5121_resources_120'


When I called the task in my build file I was getting this error message:

java.lang.NullPointerException

at anttask.JustBuild.execute(JustBuild.java:23)

at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:193)

at org.apache.tools.ant.Task.perform(Task.java:341)

at org.apache.tools.ant.Target.execute(Target.java:309)

at org.apache.tools.ant.Target.performTasks(Target.java:336)

at org.apache.tools.ant.Project.executeTarget(Project.java:1339)

at org.apache.tools.ant.Project.executeTargets(Project.java:1255)

at org.apache.tools.ant.Main.runBuild(Main.java:609)

at org.apache.tools.ant.Main.start(Main.java:196)

at org.apache.tools.ant.Main.main(Main.java:235)

I have since added in some println statements so I can see how far it is getting in the code. When I call the task, I now get the following feed back:

justbuild:
[justbuild] In execute
[justbuild] myVersion: buildnum
[justbuild] got dot: -1
[justbuild] got buildnum: buildnum
[justbuild] project is :
[justbuild] project: org.apache.tools.ant.Project@8acf6e

From this it looks like it is not finding buildnumber in the project.
Can anyone see where I have gone wrong?

This is the code that I am testing it with at the moment:

package anttask;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.Project;

public class JustBuild extends Task

{
public static void main(String[] args)
{
JustBuild justBuild = new JustBuild();
//justBuild.setVersion("01.05.2004");
justBuild.execute();
}
private String myVersion;

public void setVersion(String version)
{
myVersion = version;
}

public void execute()
{
System.out.println("In execute");

myVersion = getProject().getProperty("version");
if (myVersion == null)
{
System.out.println("myVersion is null");
}
else
{
System.out.println(" myVersion: " + myVersion.toString());
int dot = myVersion.lastIndexOf(".");
System.out.println(" got dot: " + String.valueOf(dot));
String buildnum = myVersion.substring(dot+1);
System.out.println(" got buildnum: " + buildnum);
System.out.println(" project is :");
System.out.println(" project: "+ getProject().toString());
getProject().setProperty("buildnum", buildnum);
}
}
}

Thanks in advance.

Rhonda

[ May 13, 2004: Message edited by: Rhonda Brown ]
[ May 13, 2004: Message edited by: Rhonda Brown ]

[Tim Holloway]

It would require more looking to solve THAT problem, but if all you want is an automatic-incrementing build number, there's an ant task to handle that, at least since Ant 1.6. It's called something like "buildversion".