Maven "Java heap space" error with Sakai 23 + Java 11

[Austin]

Hello Sakai Devs,

Is anyone else seeing intermittent java heap space issues when compiling Sakai 23 + Java 11?

I'm using:

Java 11 (Temurin  "11.0.12" 2021-07-20)

Maven 3.8.2

[ERROR] Failed to execute goal org.sakaiproject.maven.plugins:sakai:1.4.5:component (default-component) on project sakai-kernel-impl: Error assembling WAR: Problem creating war: Execution exception: Java heap space -> [Help 1]

I don't recall seeing this issue with Sakai 22 + Java 8, but increasing -Xmx to 2048 seems to be helping so far.

export MAVEN_OPTS="-Xms512m -Xmx2048m"

Anyway, if anyone else is seeing this error and increasing xmx helps you too, perhaps this doc should be updated:

https://github.com/sakaiproject/sakai/wiki/Quick-Start-from-Source

and could some Sakai 22 and Sakai 23 docs with that info could be added to install guides under:

https://confluence.sakaiproject.org/display/DOC/Release+Documentation

Thanks,

Austin

[Austin]

Also, I'm running mvn with 

-T 1C

to enable multi core building and I think that also takes up extra memory.

[Matthew Jones]

I haven't seen that yet locally, but I did notice and wrote on Slack that Java brought a number of new options for memory allocation that we may want to make better recommendations for. This article had a good summary. https://www.atamanroman.dev/articles/jvm-memory-settings-container-environment/

You can pretty much remove the other memory options now and use things like

-XX:MaxRAM=3g and -XX:MaxRAMFraction=1 to let it use up to 3gb.

They also have this -XX:MaxRAMPercentage to allow a process to use a percentage of what's available. It also looks like Java can better detect when it's running in a container and adjust it's RAM usage in that case too. 

For Maven I usually don't set any memory options at all, but I also run my builds in a Docker container. My only opts are

MAVEN_OPTS=-XX:+TieredCompilation -XX:TieredStopAtLevel=1

I also use the -T C1

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