This test fails in mach5:
----------System.err:(27/1978)----------
java.lang.Error: no ComponentUI class for: javax.swing.JComboBox[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,border=,flags=8,maximumSize=,minimumSize=,preferredSize=,isEditable=false,lightWeightPopupEnabled=true,maximumRowCount=8,selectedItemReminder=]
at java.desktop/javax.swing.UIDefaults.getUIError(UIDefaults.java:760)
at java.desktop/javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:133)
at java.desktop/javax.swing.UIDefaults.getUI(UIDefaults.java:790)
at java.desktop/javax.swing.UIManager.getUI(UIManager.java:1065)
at java.desktop/javax.swing.JComboBox.updateUI(JComboBox.java:277)
at java.desktop/javax.swing.JComboBox.init(JComboBox.java:236)
at java.desktop/javax.swing.JComboBox.<init>(JComboBox.java:230)
at Test8015336.main(Test8015336.java:34)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:229)
at java.base/java.lang.Thread.run(Thread.java:841)
java.lang.NullPointerException
at Test8015336.main(Test8015336.java:34)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:229)
at java.base/java.lang.Thread.run(Thread.java:841)

JavaTest Message: Test threw exception: java.lang.NullPointerException
JavaTest Message: shutting down test