Ubuntu Unit Tests: Error unmarshaling, nested: EOFException

Popup window during unit testing on Ubuntu:

[edu.rice.cs.util.newjvm.AbstractMasterJVM.attemptQuit(219)]
["main" 1]
[22:23:07.395]
Unable to complete slave.quit()
java.rmi.UnmarshalException: Error unmarshaling return header; nested exception is:
java.io.EOFException
at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:209)
sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)
java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:178)
java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)
$Proxy0.quit(Unknown Source)
edu.rice.cs.util.newjvm.AbstractMasterJVM.attemptQuit(AbstractMasterJVM.java:218)
edu.rice.cs.util.newjvm.AbstractMasterJVM.quitSlave(AbstractMasterJVM.java:210)
edu.rice.cs.drjava.model.repl.newjvm.MainJVM.access$1200(MainJVM.java:89)
edu.rice.cs.drjava.model.repl.newjvm.MainJVM$RunningState.stop(MainJVM.java:796)
edu.rice.cs.drjava.model.repl.newjvm.MainJVM$RunningState.dispose(MainJVM.java:808)
edu.rice.cs.drjava.model.repl.newjvm.MainJVM.dispose(MainJVM.java:163)
edu.rice.cs.drjava.model.DefaultGlobalModel.dispose(DefaultGlobalModel.java:312)
edu.rice.cs.drjava.model.GlobalModelTestCase.tearDown(GlobalModelTestCase.java:146)
junit.framework.TestCase.runBare(TestCase.java:136)
junit.framework.TestResult$1.protect(TestResult.java:106)
junit.framework.TestResult.runProtected(TestResult.java:124)
junit.framework.TestResult.run(TestResult.java:109)
junit.framework.TestCase.run(TestCase.java:120)
junit.framework.TestSuite.runTest(TestSuite.java:230)
junit.framework.TestSuite.run(TestSuite.java:225)
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:81)
junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:36)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:420)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:911)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:768)
java.io.EOFException
at
java.io.DataInputStream.readByte(DataInputStream.java:250)
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:195)
sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)
java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:178)
java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)
$Proxy0.quit(Unknown Source)
edu.rice.cs.util.newjvm.AbstractMasterJVM.attemptQuit(AbstractMasterJVM.java:218)
edu.rice.cs.util.newjvm.AbstractMasterJVM.quitSlave(AbstractMasterJVM.java:210)
edu.rice.cs.drjava.model.repl.newjvm.MainJVM.access$1200(MainJVM.java:89)
edu.rice.cs.drjava.model.repl.newjvm.MainJVM$RunningState.stop(MainJVM.java:796)
edu.rice.cs.drjava.model.repl.newjvm.MainJVM$RunningState.dispose(MainJVM.java:808)
edu.rice.cs.drjava.model.repl.newjvm.MainJVM.dispose(MainJVM.java:163)
edu.rice.cs.drjava.model.DefaultGlobalModel.dispose(DefaultGlobalModel.java:312)
edu.rice.cs.drjava.model.GlobalModelTestCase.tearDown(GlobalModelTestCase.java:146)
junit.framework.TestCase.runBare(TestCase.java:136)
junit.framework.TestResult$1.protect(TestResult.java:106)
junit.framework.TestResult.runProtected(TestResult.java:124)
junit.framework.TestResult.run(TestResult.java:109)
junit.framework.TestCase.run(TestCase.java:120)
junit.framework.TestSuite.runTest(TestSuite.java:230)
junit.framework.TestSuite.run(TestSuite.java:225)
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:81)
junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:36)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:420)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:911)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:768)