After Scott upgraded the ant used in AS trunk from 1.6.5 to 1.7.1, all hudson testsuite builds are marked as failed, e.g.

http://hudson.qa.jboss.com/hudson/view/JBoss%20AS/job/JBoss-AS-5.0.x-TestSuite-sun15/860/

I've configured hudson to keep testsuite/output/tests.log & testsuite/output/log/test.log but they don't offer any useful information.

In fact, testsuite/output/tests.log gets overwriten with useless info:

BUILD FAILED

/qa/services/hudson/hudson_workspace/workspace/JBoss-AS-5.0.x-TestSuite-jrockit15/trunk/testsuite/build.xml:968: Some servers failed to shutdown cleanly.
at org.apache.tools.ant.taskdefs.Exit.execute(Exit.java:142)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
at org.apache.tools.ant.Main.runBuild(Main.java:758)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)