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--- ui_access_from_job [2013/12/02 21:02]
+++ ui_access_from_job [2021/04/05 11:23] (current)
@@ Line 1: / Line 1: @@
+====== Accessing UI from Background Job ======
+In SWT (Eclipse) the UI can only be access and modified from the main Thread. Everything else results in an error:
+  org.eclipse.swt.SWTException: Invalid thread access
+This can be fixed by synchronizing the with the main thread.
+In Eclipse e4 a ''UISynchronize'' instance can be injected like this:
+  @Inject private UISynchronize sync;
+This allows us to run something from a background job accessing the UI.
+<sxh java>
+sync.asyncExec(new Runnable() {
+  @Override
+  public void run() {
+    // your UI access here
+  }
+});
+</sxh>
+===== Links =====
+  * [[http://www.vogella.com/articles/EclipseJobs/article.html | Eclipse Jobs]]
+{{tag>e4 devel java}}