Why is javac 1.5 running so slowly compared with the Eclipse compiler?

Question

I have a Java Maven project with about 800 source files (some generated by javacc/JTB) which is taking a good 25 minutes to compile with javac.

When I changed my pom.xml

Answer 1

It may be that the javac compiler operates close at its heap limit (64MB or so). In that case, it spends most of the time in the garbage collector. Give the compiler a good chunk of memory, say 256M or 512M and see if it runs faster.