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README.md

Fission: Java and JVM Environment

This is the JVM environment for Fission.

It's a Docker image containing a OpenJDK8 runtime, along with a dynamic loader. A few dependencies are included in the pom.xml file.

Customizing this image

To add package dependencies, edit pom.xml to add what you need, and rebuild this image (instructions below).

Rebuilding and pushing the image

You'll need access to a Docker registry to push the image: you can sign up for Docker hub at hub.docker.com, or use registries from gcr.io, quay.io, etc. Let's assume you're using a docker hub account called USER. Build and push the image to the the registry:

   docker build -t USER/jvm-env . && docker push USER/jvm-env

Using the image in fission

You can add this customized image to fission with "fission env create":

   fission env create --name jvm --image USER/jvm-env

Or, if you already have an environment, you can update its image:

   fission env update --name jvm --image USER/jvm-env   

After this, fission functions that have the env parameter set to the same environment name as this command will use this environment.

Web Server Framework

JVM environment uses Tomcat HTTP server by default as it is included in spring web. You can choose to use jetty or undertow by changing the dependency in pom.xml file as shown below.

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
	<exclusions>
		<!-- Exclude the Tomcat dependency -->
		<exclusion>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
		</exclusion>
	</exclusions>
</dependency>
<!-- Use Jetty instead -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>

Java and JVM builder

JVM environment builder is based on OpenJDK8 and Maven 3.5.4 version. The default build command runs mvn clean package and uses the target/*with-dependencies.jar file for function. The default build command can be overridden as long as the uber jar file is copied to ${DEPLOY_PKG}.