How to solve error when executing Ant JUnitLauncher task?

[DavidJng]

Hi, 
in my Ant script, I use the following code to run junit tests:

<junitlauncher haltOnFailure="true" printSummary="true">
 <classpath refid="test.classpath"/>
 <testclasses outputdir="reports">
  <fileset dir="bin">
   <include name="**/*.class"/>
  </fileset>
 <listener type="legacy-xml" sendSysOut="true" sendSysErr="true"/>
 <listener type="legacy-plain" sendSysOut="true" />
 </testclasses>
</junitlauncher>

If I start this target via command line, everything works fine. But if Bamboo starts the target, it logs the following error:

build.xml:21: Failed to launch in-vm tests

I found this error message in line 222 of JUnitLauncherTask.java here. But I have no idea, how to fix it.

I'm using ant 1.10.7 and Java JDK 13.0.1. Also I'm using a virtual machine.

At all I just want to run one JUnit test with bamboo.

Thanks in advance,

David