Hi all,
I'm writing a custom task at the moment and I've come across a problem
the simple act of trying to log causes a NullPointerException at
Task:347 which seems to be failing as the project is null.
I'm pretty sure that this is being caused by my code, but I can't see
what the problem is at all:
<build.xml>
<?xml version="1.0"?>
<project name="darcs" default="test" basedir=".">
<target name="test">
<echo message="Ant setup correctly" />
</target>
<target name="test-darcs">
<taskdef name="darcs"
classname="org.apache.tools.ant.taskdefs.optional.darcs.Darcs" />
<darcs command="initialize" />
</target>
</project>
for simplicity I'm writing within the ant codebase, later I'll break it
out into a separate jar
class that fails
package org.apache.tools.ant.taskdefs.optional.darcs.commands;
import java.io.IOException;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.taskdefs.Execute;
import org.apache.tools.ant.taskdefs.optional.darcs.AbstractDarcs;
public class Initialize extends AbstractDarcs implements DarcsCommand {
private boolean pristineTree = true;
private static final String PRISTINE = "--plain-pristine-tree";
private static final String NO_PRISTINE = "--no-pristine-tree";
/**
* set to use the pristine tree option
* @param pristineTree
*/
public void setPristineTree(final boolean pristineTree) {
this.pristineTree = pristineTree;
}
public void execute() throws BuildException {
String[] cmdline;
if (pristineTree) {
cmdline = createCommandline(DarcsCommandList.DARCS, new
String[] {DarcsCommandList.INITIALIZE, PRISTINE});
} else {
cmdline = createCommandline(DarcsCommandList.DARCS, new
String[] {DarcsCommandList.INITIALIZE, NO_PRISTINE});
}
Execute exe = new Execute(getExecuteStreamHandler(), null);
exe.setCommandline(cmdline);
try {
if(verbose) {
log("Executing : "+this); <-- this breaks with
NullPointerException
}
exe.execute();
} catch (IOException e) {
throw new BuildException("There was a problem executing the
command [ "+this.toString()+" ]");
}
}
}
annoyingly the code works as intended without the logging, I just don't
know why it can't find the project when getProject is called in the Task
superclass.
with -verbose on, I get a message about antlib.xml not found, but that
should have nothing to do with this.
just for completeness, here's my stack trace:
BUILD FAILED
D:\eclipse\WORKSP~1\ant\darcs.xml:14: java.lang.NullPointerException
at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.jav
a:114)
at org.apache.tools.ant.Task.perform(Task.java:365)
at org.apache.tools.ant.Target.execute(Target.java:356)
at org.apache.tools.ant.Target.performTasks(Target.java:384)
at
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1236)
at org.apache.tools.ant.Project.executeTarget(Project.java:1205)
at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExe
cutor.java:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1088)
at org.apache.tools.ant.Main.runBuild(Main.java:676)
at org.apache.tools.ant.Main.startAnt(Main.java:195)
at org.apache.tools.ant.Main.start(Main.java:158)
at org.apache.tools.ant.Main.main(Main.java:236)
Caused by: java.lang.NullPointerException
at org.apache.tools.ant.Task.log(Task.java:347)
at org.apache.tools.ant.Task.log(Task.java:335)
at
org.apache.tools.ant.taskdefs.optional.darcs.commands.Initialize.exec
ute(Initialize.java:34)
at
org.apache.tools.ant.taskdefs.optional.darcs.Darcs.execute(Darcs.java
:19)
at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.jav
a:104)
... 11 more
--- Nested Exception ---
java.lang.NullPointerException
at org.apache.tools.ant.Task.log(Task.java:347)
at org.apache.tools.ant.Task.log(Task.java:335)
at
org.apache.tools.ant.taskdefs.optional.darcs.commands.Initialize.exec
ute(Initialize.java:34)
at
org.apache.tools.ant.taskdefs.optional.darcs.Darcs.execute(Darcs.java
:19)
at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.jav
a:104)
at org.apache.tools.ant.Task.perform(Task.java:365)
at org.apache.tools.ant.Target.execute(Target.java:356)
at org.apache.tools.ant.Target.performTasks(Target.java:384)
at
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1236)
at org.apache.tools.ant.Project.executeTarget(Project.java:1205)
at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExe
cutor.java:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1088)
at org.apache.tools.ant.Main.runBuild(Main.java:676)
at org.apache.tools.ant.Main.startAnt(Main.java:195)
at org.apache.tools.ant.Main.start(Main.java:158)
at org.apache.tools.ant.Main.main(Main.java:236)
Total time: 0 seconds
My guess is that I'm doing something incredibly stupid, but I thought
you might see a problem within the code - using latest CVS version
Thanks for any help
Kev
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