JaroslavTulach opened a new pull request, #4134:
URL: https://github.com/apache/netbeans/pull/4134
A colleague of mine reported following error when using `Sampler`:
```
Caused by: java.awt.AWTError: Could not create Toolkit: sun.awt.X11.XToolkit
at java.desktop/java.awt.Toolkit$2.run(Toolkit.java:607)
at java.desktop/java.awt.Toolkit$2.run(Toolkit.java:583)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.desktop/java.awt.Toolkit.getDefaultToolkit(Toolkit.java:582)
at java.desktop/java.awt.Toolkit.getEventQueue(Toolkit.java:1494)
at
java.desktop/java.awt.EventQueue.isDispatchThread(EventQueue.java:1086)
at
java.desktop/javax.swing.SwingUtilities.isEventDispatchThread(SwingUtilities.java:1493)
at org.netbeans.modules.sampler.Sampler.stopSampling(Sampler.java:232)
at org.netbeans.modules.sampler.Sampler.stopAndWriteTo(Sampler.java:209)
at org.netbeans.modules.sampler.Test.stopSampling(Test.java:58)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
... 1 more
```
We shouldn't be calling into Swing in a library that is supposed to be used
in a headless environment. Removing the (almost useless) check.
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