<Swing Dev> RFR: 8198400: Test javax/swing/SwingUtilities/6797139/bug6797139.java fails in mach5

[Phil Race]

On Sun, 18 Oct 2020 03:36:27 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> Please review a test fix for an issue seen failing in mach5 testing although it is not reproducible locally.
>> The issue seems to stem from the fact that the test was been run as headless test although it requires to create UI
>> class like ComponentUI which is needed for painting, layout calculations etc and therefore it fails citing
>> _no ComponentUI class for:
>> javax.swing.JButton[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,border=,flags=0,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=null,paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=false,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=Probably,defaultCapable=true]_
>> Modified the test to mark it as headful.
>> Mach5 job was run for several iteration on all 3 platforms. Link in JBS
>
> It does not look like the test uses any API which required the headful system, none of them throw a headless exception.

if you run it locally with -Djava.awt.headless=true what happens ?
And in the bug report I see
Caused by: java.lang.NullPointerException
at java.desktop/javax.swing.plaf.basic.LazyActionMap.installLazyActionMap(LazyActionMap.java:64)

So installUI failed which is why there's no componentUI but why did we get this NPE that started it ?

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PR: https://git.openjdk.java.net/jdk/pull/719