Steps to reproduce

• go to sources/net.sf.j2s.lib
• make sure no directory j2slib exists. (run rm -r j2slib if necessary)
• run ant -f build/build.xml

The build will report these errors for the target j2s.pack.core:

• [java] java.io.FileNotFoundException: /Users/ub/work/project/sd/thirdparty/java2script(java2script)/sources/net.sf.j2s.lib/build/../../net.sf.j2s.lib/j2slib/j2slib.z.js (No such file or directory)
• [java] java.io.FileNotFoundException: /Users/ub/work/project/sd/thirdparty/java2script(java2script)/sources/net.sf.j2s.lib/build/../../net.sf.j2s.lib/j2slib/j2slib.src.z.js (No such file or directory)
• [java] java.io.FileNotFoundException: /Users/ub/work/project/sd/thirdparty/java2script(java2script)/sources/net.sf.j2s.lib/build/../../net.sf.j2s.lib/j2slib/j2slib.swt.z.js (No such file or directory)
• [java] java.io.FileNotFoundException: /Users/ub/work/project/sd/thirdparty/java2script(java2script)/sources/net.sf.j2s.lib/build/../../net.sf.j2s.lib/j2slib/j2slibcore.z.js (No such file or directory)

(Complete log of initial run)

Workaround

When running ant -f build/build.xml a second time the errors are gone.

(Complete log of second run)

Possible Solution

It looks like the order in the processing needs to be changed. The compacted files are referenced before they are created.