Emma Strubell Emma Strubell - 2 months ago 13
Scala Question

Travis CI ignoring MAVEN_OPTS?

My Scala project (Maven-managed) is failing to build on Travis, throwing a

GC overhead limit exceeded
error despite compiling fine locally with the same
MAVEN_OPTS=-Xmx3g -XX:MaxPermSize=512m
. I suspect that Travis is somehow ignoring my
MAVEN_OPTS
: When I try to test against Oracle JDK 8, Travis logs:

$ Setting environment variables from .travis.yml
$ export MAVEN_OPTS="-XX:MaxPermSize=512m -Xmx3g"


which looks good. However, soon after it logs:

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=192m; support was removed in 8.0


which is troubling since NOWHERE am I specifying
-XX:MaxPermSize=192m
, only
512m
. (This leads me to believe my
-Xmx3g
is also being ignored, causing the compilation failure.)

I tried specifying the
MAVEN_OPTS
in many additional places in my pom, to no avail. For example, for the maven-scala-plugin, I have:

<configuration>
...
<jvmArgs>
<jvmArg>-Xmx3g</jvmArg>
<jvmArg>-XX:MaxPermSize=512m</jvmArg>
</jvmArgs>
</configuration>


And I also have the following under the maven-surefire-plugin and scalatest plugin, though the build is failing during compilation not tests:

<configuration>
<argLine>-Xmx3g -XX:MaxPermSize=512m</argLine>
</configuration>


The following is the entirety of my .travis.yml:

language: java
env:
global:
- MAVEN_OPTS="-XX:MaxPermSize=512m -Xmx3g"
script: mvn clean install
jdk:
- oraclejdk8
- oraclejdk7


I'm using Scala 2.11.2 and scala-maven-plugin 3.2.0.

Answer

UPDATE (11/2/15):

This was finally fully resolved here. Quoting:

If you want to use container-based builds (not relying on sudo), you can echo what you want into a $HOME/.mavenrc file and that will take precedence over /etc/mavenrc, like so:

in .travis.yml:

before_script:
  - echo "MAVEN_OPTS='-Xmx2g -XX:MaxPermSize=512m'" > ~/.mavenrc

(you could also put this in before_install depending on your setup).

Old answer:

I finally found the answer here, which references this (closed but not resolved) issue on the Travis CI github.

It seems like Travis exports a MAVEN_OPTS environment variable as root via the file /etc/mavenrc, which then does not get overridden by any other MAVEN_OPTS definitions (e.g. via env/global settings in the travis config). The workaround is to delete /etc/mavenrc before setting custom MAVEN_OPTS.

I was able to set custom MAVEN_OPTS and build successfully using the following in my .travis.yml:

script:
  - sudo rm /etc/mavenrc
  - export MAVEN_OPTS="-Xmx2469m -XX:MaxPermSize=512m"
  - mvn clean install

Note that I am NOT using language: java in my travis config, just calling maven directly via the script directive.

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