SWT

SWT is the approved GUI framework for E-on-Java. (AWT is also supported, but there is concern about the correctness of its taming due to its complexity).

SWT on Mac OS X
For proper GUI behavior, it is generally necessary to execute SWT applications on Mac OS X from within a Mac OS X application bundle. There is a utility,, to do this provided in the scripts directory of the E-on-Java distribution.

Snow Leopard compatibility
From:   Thomas Leonard  Subject: Re: [e-lang] Problems with E + SWT on Mac OS X [ solved ] Date:   October 21, 2009 4:33:10 EDT To:     e-lang@mail.eros-os.org On Tue, 2009-10-20 at 16:44 +0100, Thomas Leonard wrote: > I'm trying to get E used a bit more widely here, but our Mac user > (10.6.1, Snow Leopard, Java 1.6, 32-bit x86) gets this error (many > hundreds of lines): > > 2009-10-20 16:30:24.779 java[3000:8a03] *** __NSAutoreleaseNoPool: > Object 0x12047a0 of class NSCFString autoreleased with no pool in  > place - just leaking OK, it seems that we've found a combination that works: 1. Use the 32 bit version of Java (can be set using the "Java Preferences" utility). 2. Download the correct version of SWT: "Mac OSX (Mac/Carbon)". If you are getting lot of "just leaking" messages, you downloaded the wrong one. We used this version: http://download.eclipse.org/eclipse/downloads/drops/R-3.5.1-200909170800/index.php#SWT