When building the 1.4.2 workspace a call is made to import the w2k_lsa_auth.dll native library into the j2se bundle.
The location of this file is ARCH dependant. In amd64 case, we don't have a matching directory in the j2se workspace.
W2K_LSA_AUTH_ZIP = $(BUILDDIR)/tools/crypto/jgss/$(ARCH)/w2k_lsa_auth.zip

bash-2.03$ ls /java/re/jdk/1.4.2_13/promoted/latest/ws/j2se/make/tools/crypto/jgss
SCCS i586 ia64 jgss_kerberos.jar

As a result, SAP are seeing crashes anytime a native call is made into the w2k_lsa_auth library. It appears that the i586 bundle is included instead.