[Bug 247997] databases/cassandra3: fix build on aarch64 (Java OutOfMemory during build)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247997

Ronald Klop <ronald-lists at klop.ws> changed:

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--- Comment #4 from Ronald Klop <ronald-lists at klop.ws> ---
Created attachment 216511
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=216511&action=edit
set max mem to 512 MB (svn diff)

Used the ANT_OPTS="$ANT_OPTS ..." construction.

Did some more testing with "java -XX:+PrintFlagsFinal -version | grep MaxHeap".
On my RPI3 with 1 GB RAM Java uses a default mx of 256MB which is too small.
On my amd64 VM with 5 GB RAM Java uses an mx of 1270MB which is plenty.

Both compile perfectly with -Xmx512m.
jstat -gc shows the RPI3 does quite some GC and reaches 512MB quite often. The
amd64 never hits the max mem with 512 MB avail.

This is all on openjdk8.
RPI3: OpenJDK 64-Bit Zero VM (build 25.242-b07, interpreted mode)
AMD64: OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)

So I think this is ready to be committed.

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