XJCTask is failing with NPE when called from ANT task. The stack trace example:
value variable passed in to setProperty is null.
/root/tiberio/test/build.xml:18: java.lang.NullPointerException
at org.apache.tools.ant.Task.perform(Task.java:373)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.jav

a:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by: java.lang.NullPointerException
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.setProp

erty(XMLDocumentFragmentScannerImpl.java:776)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.setProperty(XML

DocumentScannerImpl.java:448)
at
com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaParsingConfig.setPropert

y(SchemaParsingConfig.java:492)
at
com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaDOMParser.setProperty(Sc

hemaDOMParser.java:503)
at
com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reset(XSDHand

ler.java:3594)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.reset(XMLSchemaLoad

er.java:1068)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSche

maLoader.java:561)
at
com.sun.org.apache.xerces.internal.parsers.XMLGrammarPreparser.preparseGrammar

(XMLGrammarPreparser.java:205)
at
com.sun.tools.xjc.reader.xmlschema.parser.SchemaConstraintChecker.check(Schema

ConstraintChecker.java:78)
at com.sun.tools.xjc.GrammarLoader.loadXMLSchema(GrammarLoader.java:330)
at com.sun.tools.xjc.GrammarLoader.load(GrammarLoader.java:127)
at com.sun.tools.xjc.GrammarLoader.load(GrammarLoader.java:76)
at com.sun.tools.xjc.XJCTask._doXJC(XJCTask.java:358)
at com.sun.tools.xjc.XJCTask.doXJC(XJCTask.java:307)
at com.sun.tools.xjc.XJCTask.execute(XJCTask.java:247)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
... 10 more