JNI in Cloud Foundry web app

[Jay Allen]

Hey all,

We have a java web app that makes heavy use of JNI through libraries defined in LD_LIBRARY_PATH.  We can run the app locally by setting the library path in setenv.sh in Tomcat;  our first thought for Cloud Foundry was to push the entire Tomcat+web app with a modified setenv.sh as a standalone app but that doesn't appear to be possible in CF V2.  Does anyone know of a way to configure a java web app and/or CF so that java can find the native code (and the libraries can find each other through LD_LIBRARY_PATH).

Jay

[James Bayer]

i think you could probably use the standalone approach of bundling tomcat with your app with the null buildpack:

https://github.com/ryandotsmith/null-buildpack

and use a Procfile with contents like:

web: bin/catalina.sh

making sure to setup the env similar to the java buildpack:

https://github.com/cloudfoundry/java-buildpack/blob/master/lib/java_buildpack/container/tomcat.rb#L60

if you're not familiar with buildpacks and ruby it might be a bit tough to reason about how the java buildpack works at first, but i think this would work. you'll have to make sure that the max memory settings get set with the JVM and that tomcat binds to the assigned $PORT variable too.

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Thank you,

James Bayer

[Jay Allen]

Hey thanks James, we'll give that a shot and let you know how we do!

Jay