Random jigsaw build error

[Sean Mullan]

Often when I am working on some local code changes which cause a build to fail, 
I will fix the error, and then do a "make all" from the top level directory. The 
build will proceed further but then fail with the following error:

     make[4]: Entering directory `/home/mullan/hg/jigsaw-certs/jdk/make/java/net'
     ...
     Error: Could not find class file for 'java.net.InetAddressImplFactory'.

(I can send further details of the build log if necessary).

If I then do a "make clean; make all", the error goes away...

Has anyone else encountered this? It is frustrating because I have to do a 
complete rebuild from scratch.

Thanks,
Sean