no cores?

[Artem Gr]

Almost every day i see something like
+pid 93620 (java), uid 1004: exited on signal 6 (core dumped)
in my "security run output", but there is no "java.core" or 
"hs_err_pid/N/.log" found anywhere in the system afterwards.
I know the previous installation (/usr/ports/java/jdk15/) has dumped 
cores all right.
The (java) application is started in a user-writable directory.
(I've just checked, invoking "new File(".").getCanonicalPath()" from the 
app gives this user-writable directory as expected.)

java -version
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build diablo-1.5.0-b00)
Java HotSpot(TM) Client VM (build diablo-1.5.0_06-b00, mixed mode)

uname -mprs
FreeBSD 6.0-RELEASE i386 i386

java is started directly: "/usr/local/diablo-jdk1.5.0/bin/java -server 
-XX:+UseMembar"