Onto the next puzzle: I’m trying to compile without importing any JCL code, in order to find out what JRE code needs to be emulated that is not covered by GWT. I’m getting this very peculiar output:

Buildfile: /home/jacob/workspace/gsoc-phase-1/org.eclipse.swt.e4.examples/dojo/build.xml

init:

build-dojo:

         WARNING: 'com.google.gwt.dev.GWTCompiler' is deprecated and will be removed in a future release.

         Use 'com.google.gwt.dev.Compiler' instead.

         (To disable this warning, pass -Dgwt.nowarn.legacy.tools as a JVM arg.)

         Compiling module controlexample

            Refreshing module from source

               Validating newly compiled units

                  Removing units with errors

                     [ERROR] Errors in 'file:/home/jacob/workspace/gsoc-phase-1/org.eclipse.swt/Eclipse%20SWT/common/org/eclipse/swt/internal/image/PNGFileFormat.java'

                        [ERROR] Line 294: The method getProperty(String) is undefined for the type System

...

Why on earth is the GWT compiler trying to go inside of org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal?