stt-mac-39:bin gtee$ /export/jdk/jdk9150/bin/java fileOperatorBug.fileOperatorTest 
Using org.netbeans.jemmy.drivers.APIDriverInstaller driver installer
Trace:
Start to wait frame "Frame with title "Sample File Chooser"" opened
Trace:
Frame "Frame with title "Sample File Chooser"" has been opened in 1 milliseconds
    javax.swing.JFrame[frame0,240,193,800x600,invalid,layout=java.awt.BorderLayout,title=Sample File Chooser,resizable,normal,defaultCloseOperation=EXIT_ON_CLOSE,rootPane=javax.swing.JRootPane[,0,22,800x578,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]
Trace:
Click 1times on "testFile2854896695121493587.txt" file in JFileChooser
    : javax.swing.JFileChooser[,0,0,800x578,invalid,layout=javax.swing.BoxLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=320,maximumSize=,minimumSize=,preferredSize=,approveButtonText=,currentDirectory=/var/folders/pm/9r8qqj352mj9wpt7py9jsm70001wjw/T,dialogTitle=,dialogType=OPEN_DIALOG,fileSelectionMode=FILES_ONLY,returnValue=ERROR_OPTION,selectedFile=,useFileHiding=true]
Exception in thread "main" java.lang.NullPointerException
	at org.netbeans.jemmy.operators.JFileChooserOperator$61.actionProduced(JFileChooserOperator.java:1491)
	at org.netbeans.jemmy.operators.JFileChooserOperator$61.actionProduced(JFileChooserOperator.java:1)
	at org.netbeans.jemmy.Waiter.actionProduced(Waiter.java:229)
	at org.netbeans.jemmy.Waiter.waitAction(Waiter.java:203)
	at org.netbeans.jemmy.operators.JFileChooserOperator.waitPainted(JFileChooserOperator.java:1521)
	at org.netbeans.jemmy.operators.JFileChooserOperator.getFiles(JFileChooserOperator.java:761)
	at org.netbeans.jemmy.operators.JFileChooserOperator$65.actionProduced(JFileChooserOperator.java:1597)
	at org.netbeans.jemmy.operators.JFileChooserOperator$65.actionProduced(JFileChooserOperator.java:1)
	at org.netbeans.jemmy.Waiter.actionProduced(Waiter.java:229)
	at org.netbeans.jemmy.Waiter.waitAction(Waiter.java:203)
	at org.netbeans.jemmy.operators.JFileChooserOperator.findFileIndex(JFileChooserOperator.java:1620)
	at org.netbeans.jemmy.operators.JFileChooserOperator.clickOnFile(JFileChooserOperator.java:470)
	at org.netbeans.jemmy.operators.JFileChooserOperator.clickOnFile(JFileChooserOperator.java:497)
	at org.netbeans.jemmy.operators.JFileChooserOperator.clickOnFile(JFileChooserOperator.java:535)
	at org.netbeans.jemmy.operators.JFileChooserOperator.selectFile(JFileChooserOperator.java:621)
	at fileOperatorBug.fileOperatorTest.main(fileOperatorTest.java:19)