Running OpenJDK regression tests with 'jtreg -gui' fails

[Volker Simonis]

Hi,

maybe this is a silly question, but I'm not able to run the jtreg
tests from jdk/tests directory in GUI mode (i.e. by running jtreg with
the '-gui' option).

If I run the test from the command line, everything works perfect. E.g.

JT_JAVA=/jdk1.7.0_09 /jtreg/linux/bin/jtreg -jdk:/jdk1.7.0_09
-w:/tmp/JTwork -r:/tmp/JTreport -v java/lang/Boolean

successfully runs the 4 tests under java/lang/Boolean.

If I however use:

JT_JAVA=/jdk1.7.0_09 /jtreg/linux/bin/jtreg -jdk:/jdk1.7.0_09
-w:/tmp/JTwork -r:/tmp/JTreport -v -gui java/lang/Boolean

the jtreg-GUI appears and lists all the JDK tests in the left window.
Now no difference which tests I select and execute, they always fail
with the error " Error. Unexpected exception caught from test
java/lang/Byte/Decode.java: java.lang.NullPointerException". The stack
trace looks as follows:

java.lang.NullPointerException
    at com.sun.javatest.regtest.RegressionScript.run(RegressionScript.java:135)
    at com.sun.javatest.Script.run(Script.java:228)
    at com.sun.javatest.DefaultTestRunner.runTest(DefaultTestRunner.java:167)
    at com.sun.javatest.DefaultTestRunner.access$100(DefaultTestRunner.java:43)
    at com.sun.javatest.DefaultTestRunner$1.run(DefaultTestRunner.java:66)

It seems that for some reason, the Java-files are not compiled to
classfiles and executed as shell scripts, but I have no idea why this
happens. As stated before, without the '-gui' option, everything works
perfectly.

Any idea what I'm doing wrong?

Thank you and best regards,
Volker

PS: I've tested this with different java version (from 6 to 8) and
different jtreg versions (4.1-bin-b02 and 4.1-bin-b05) on Ubuntu 12.04
Linux all with the same result.