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Date: Fri, 27 Aug 2004 10:56:09 +0200
To: "Ant Users List" <user@ant.apache.org>
Subject: Re: calling ant from java program
References: <013401c48c06$4c27ddb0$ba015b0a@ionlifesci19>
From: "Olivier Croisier" <Olivier.Croisier@thales-is.com>
Organization: Thales Information Systems
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> What may be the reason of  project.executetarget throwing nullpointer
> exception?
> regds

Hi

My first idea was that this exception could get thrown if you call the executeTarget method with a null argument, but this error seems to be already managed by the BuildException (@see ant javadoc).

[ executeTarget ]
public void executeTarget(java.lang.String targetName) throws BuildException
Executes the specified target and any targets it depends on.
Parameters:
	targetName - The name of the target to execute. Must not be null.
Throws:
	BuildException - if the build failed


So... Another answer would be : your "NullPointerException" occurs if your Project object is null (java obviously can't call the "executeTarget" method on a null Project object). Check if your Project is initialized.

Third clue : the "test_config" string you give as an argument is a valid String, but its contents may cause an error somewhere in the executeTarget process, for example if this isn't a valid target name.
Or if the target is only defined as an internal target (no "description" for it) : I don't know if executeTarget sees them.


best regs


-- 
CROISIER Olivier
Software Engineer
Thales IS - ANS
olivier.croisier@thales-is.com

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