Running Ant 1.8.2 on Windows XP, I'm writing a task that returns a string
resource collection of target names in a project. Well, attempting to write
one.
I'm running into problems when the build file I'm parsing is from a URL
instead of a File. The main method that I have looks like this:
private Collection<String> getTargetNames() {
if (!projectFile.isExists()) {
throw new BuildException("Cannot find resource " + projectFile);
}
Project childProject = project.createSubProject();
childProject.setJavaVersionProperty();
project.copyUserProperties(childProject);
childProject.initProperties();
ProjectHelper helper =
ProjectHelperRepository.getInstance().getProjectHelperForBuildFile(projectFile);
childProject.addReference(ProjectHelper.PROJECTHELPER_REFERENCE,
helper);
helper.parse(childProject, projectFile);
Collection<String> names = childProject.getTargets().keySet();
return names;
}
The projectFile variable is a URLResource. However, I'm getting a NPE
thrown from helper.parse(Project, Object):
java.lang.NullPointerException
at
org.apache.tools.ant.helper.ProjectHelper2$ProjectHandler.onStartElement(ProjectHelper2.java:845)
at
org.apache.tools.ant.helper.ProjectHelper2$RootHandler.startElement(ProjectHelper2.java:600)
at
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:501)
at
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:400)
at
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:626)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3103)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:922)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
at
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
at
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
at
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at
org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:307)
at
org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:178)
The relevant code in ProjectHelper2 is:
// set explicitly before starting ?
if (project.getProperty("basedir") != null) {
project.setBasedir(project.getProperty("basedir"));
} else {
// Default for baseDir is the location of the build file.
if (baseDir == null) {
project.setBasedir(context.getBuildFileParent().getAbsolutePath());
} else {
// check whether the user has specified an absolute path
if ((new File(baseDir)).isAbsolute()) {
project.setBasedir(baseDir);
} else {
project.setBaseDir(FILE_UTILS.resolveFile(context.getBuildFileParent(),
baseDir));
}
}
}
The problem appears to be that build files will have a parent build file,
but in this case that's null.
Setting the basedir attribute in the build file does fix the problem, and I
can use it as a workaround for now. But since I can't always depend on that
being set I need to know if is this a Bug or a Feature? If the former I'll
submit a bug report.
Thanks,
Rich
