JenkinsX - Build fail due to Java Heap space

Question

I am working on creating CI/CD pipeline for Spring Boot application on GKE using JenkinsX. As soon as I push the code to the master branch, build gets triggered but the build fails due to insufficient Java heap space.

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:3.2.2:war (default-war) on project location-finder-api: Error assembling WAR: Problem creating war: Execution exception: Java heap space -> [Help 1]

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-war-plugin:3.2.2:war (default-war) on project location-finder-api: Error assembling WAR: Problem creating war: Execution exception

Caused by: java.lang.OutOfMemoryError: Java heap space

    at org.codehaus.plexus.archiver.zip.ByteArrayOutputStream.needNewBuffer (ByteArrayOutputStream.java:153)

    at org.codehaus.plexus.archiver.zip.ByteArrayOutputStream.write (ByteArrayOutputStream.java:192)

To resolve I tried to set the JVM argument in the Docekrfile as

CMD ["java", "-Xmx1024m","-jar", "app.jar"]

But it did not work. This is what I see when the build starts

+ mvn -e clean deploy -Pprod

Picked up _JAVA_OPTIONS: -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -Dsun.zip.disableMemoryMapping=true -XX:+UseParallelGC -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Xms10m -Xmx192m

OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N

Is there any way that I can set this heap option on my own?

Answer 1

it looks like maven is running out of memory so you need more memory in your build pod (not the Dockerfile for your app).

as a quick test you can edit the pod template inside the Jenkins UI: jx console then Manage Jenkins -> Configure System then find the jenkins-maven pod template in the UI and edit the _JAVA_OPTIONS environment variable from this value: https://github.com/jenkins-x/jenkins-x-platform/blob/master/jenkins-x-platform/values.yaml#L907 - try change -Xmx512m to something bigger like -Xmx912m

Once you've found a value that works for your projects you can make the change permanent of restarts of Jenkins by adding this to your myvalues.yaml - something like this...

# myvalues.yaml
jenkins:
  Agent:
    PodTemplates:
      Maven:
        Name: maven
        Label: jenkins-maven
        EnvVars:
          _JAVA_OPTIONS: '-XX:+UnlockExperimentalVMOptions -Dsun.zip.disableMemoryMapping=true -XX:+UseParallelGC -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Xms10m -Xmx912m'

see the docs on creating/configuring builders