java.mk

all:
	javac -version

For me, results in:

$ make-3.81 -f ~/java.mk
javac -version
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00002aed1536501b, pid=4017, tid=47151888811776
#
# JRE version: 6.0_51-b09
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.51-b01 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# J  java.lang.String.indexOf(II)I
#
# An error report file with more information is saved as:
# /local/mnt/workspace/mitchelh/jb_mr2/hs_err_pid4017.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#
make: *** [all] Aborted (core dumped)

Works fine with the latest make.

Yet from the shell, I get:

$ javac -version
javac 1.6.0_51

make absolutely sure you gave javac (or whatever tool) enough memory.
beyond that, it does indeed look quite fishy!