Lowering memory consumption for lab 15.1 on anynines a9s 1G free tier

If you are on the free tier of anynines, you'll find that by using the java_buildpack, you will be unable to run all three roster , web-ui , and rate-limit apps on the 1GB memory limit.
Instead, you can combine custom parameters to the java buildpack along with cf scale, to decrease the memory footprint and therefore stay within quota.
If you don't do this, when you cf push the app, it will complain about memory quota.
memory quota_exceeded FAILED
If you simply scale down the memory limit, it will crash on launching the instance
name: rate-limit requested state: started routes: last uploaded: Thu 04 Feb 11:26:16 AEDT 2021 stack: cflinuxfs3 buildpacks: name version detect output buildpack name java_buildpack v4.35-https://github.com/cloudfoundry/java-buildpack.git#895590c java java type: web sidecars: instances: 0/1 memory usage: 128M state since cpu memory disk details #0 crashed 2021-02-04T01:53:10Z 0.0% 0 of 128M 0 of 512M type: task sidecars: instances: 0/0 memory usage: 256M There are no running instances of this process.
In the logs will be this similar message
2021-02-04T13:08:32.79+1100 [APP/PROC/WEB/0] ERR Cannot calculate JVM memory configuration: There is insufficient memory remaining for heap. Memory available for allocation 128M is less than allocated memory 633090K (-XX:ReservedCodeCacheSize=240M, -XX:MaxDirectMemorySize=10M, -XX:MaxMetaspaceSize=121090K, -Xss1M * 250 threads)
Take this corrective action, by lowering the threads used in the memory calculator.cf set-env roster JBP_CONFIG_OPEN_JDK_JRE '{ memory_calculator: { stack_threads: 10 } }'
Restage and scale the app
cf restage roster cf scale roster -m 512M
Repeat for rate-limitcf set-env rate-limit JBP_CONFIG_OPEN_JDK_JRE '{ memory_calculator: { stack_threads: 5 } }'
Restage and scale the app
cf restage rate-limit cf scale rate-limit -m 425M
If you need to scale down any task memory limits, use the --process task argument, like so:cf scale rate-limit -m 32M --process task
Source: https://github.com/cloudfoundry/java-buildpack#configuration-and-extension
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