Antcall causes FileNotFoundException if using executeTarget within java

Hi all,
this is my first post here, so i dont know if it's the right place (sorry if so).
I try to run an ant target within a java program.
My build file (test.xml) is:
<project name="test" default="usage" basedir=".">
<target name="test1" >
    <echo message="Target test1" />
    <antcall target="test2"/>
</target>
<target name="test2" >
    <echo message="Target test2" />
</target>
</project>My java programm is:
public static void main (String [] a) {
String buildFileName = "test.xml";
File buildFile = new File (".",buildFileName);
Project project = new Project();
project.init();
ProjectHelper helper = new ProjectHelperImpl();
helper.parse(project, buildFile);
project.executeTarget("test1");
}This causes following exception:
Exception in thread "main" test.xml:4: The following error occurred while executing this line:
java.io.FileNotFoundException: build.xml
     at org.apache.tools.ant.ProjectHelper.addLocationToBuildException(ProjectHelper.java:539)
     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:336)
     at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:107)
     at org.apache.tools.ant.Task.perform(Task.java:364)
     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 test.Test.main(Test.java:19)
Caused by: java.io.FileNotFoundException: build.xml
     at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:243)
     at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:140)
     at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:91)
     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:334)
     ... 7 more
Caused by: java.io.FileNotFoundException: build.xml
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:106)
     at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:198)
     ... 10 moreIf I use <ant antfile="test.xml" target="test2"/> instead it works perfecly. But I don't want to. The target "antcall" was created to call targets within the same build-file, but why build.xml is referenced anywhere?
Might this be an ant bug?
Any ideas?
Tx

Disregard, sorry, got confused about build.xml and text.xml.
May I advise to ask at an Ant forum, though?

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