If the java/awt/FullScreen/AltTabCrashTest/AltTabCrashTest.java test fails, it leaves the host in a bad state, which leads to all tests that run after AltTabCrashTest.java to throw AWTError.

There are several jobs like this.

1. AltTabCrashTest.java fails
command: main AltTabCrashTest -auto -changedm
reason: User specified action: run main/othervm/timeout=100 AltTabCrashTest -auto -changedm
STDOUT:
STDERR:
Running in automatic mode using Robot
The test will change display mode
Alt+tabber Iteration: 4
Issuing alt+tab
TEST RESULT: Failed. Unexpected exit from test [exit code: 1]

2. The next test after it, java/awt/FullScreen/BufferStrategyExceptionTest/BufferStrategyExceptionTest.java, also fails. Now it throws AWTError:

java.awt.AWTError: Can't connect to X11 window server using ':0' as the value of the DISPLAY variable.
        at java.desktop/sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
        at java.desktop/sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:105)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:319)
        at java.desktop/sun.awt.X11GraphicsEnvironment.initStatic(X11GraphicsEnvironment.java:64)
        at java.desktop/sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:59)
        at java.desktop/sun.awt.PlatformGraphicsInfo.createGE(PlatformGraphicsInfo.java:37)
        at java.desktop/java.awt.GraphicsEnvironment$LocalGE.createGE(GraphicsEnvironment.java:93)
        at java.desktop/java.awt.GraphicsEnvironment$LocalGE.<clinit>(GraphicsEnvironment.java:84)
        at java.desktop/java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:106)
        at BufferStrategyExceptionTest.main(BufferStrategyExceptionTest.java:60)

3. All the following tests fail for the same reason, specifically
java.awt.AWTError: Can't connect to X11 window server using ':0' as the value of the DISPLAY variable.