Sahil LakhwaniandGitHub
54b384efec
A new Jersey framework based JVM environment which is lightweight and simpler.
61 lines
2.2 KiB
Markdown
61 lines
2.2 KiB
Markdown
# Hello World in JVM/Java on Fission
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The `io.fission.HelloWorld.java` class is a very simple fission function that implements `io.fission.Function` and says "Hello, World!" .
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## Building and deploying using Fission
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Fission's builder can be used to create the binary artifact from source code. Create an environment with builder image and then create a package.
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```
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$ zip -r java-src-pkg.zip *
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$ fission env create --name java --image fission/jvm-env --version 2 --keeparchive --builder fission/jvm-builder
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$ fission package create --sourcearchive java-src-pkg.zip --env java
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java-src-pkg-zip-tvd0
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$ fission package info --name java-src-pkg-zip-tvd0
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Name: java-src-pkg-zip-tvd0
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Environment: java
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Status: succeeded
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Build Logs:
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[INFO] Scanning for projects...
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[INFO]
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[INFO] -----------------------< io.fission:hello-world >-----------------------
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[INFO] Building hello-world 1.0-SNAPSHOT
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[INFO] --------------------------------[ jar ]---------------------------------
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```
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Once package's status is `succeeded` then that package can be used to create and execute a function.
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```
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$ fission fn create --name hello --pkg java-src-pkg-zip-tvd0 --env java --entrypoint io.fission.HelloWorld
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$ fission fn test --name hello
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Hello World!
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```
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## Building locally and deploying with Fission
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You can build the jar file in one of the two ways below based on your setup:
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- You can use docker without the need to install JDK and Maven to build the jar file from source code:
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```bash
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$ bash -x ./build.sh
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```
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- If you have JDK and Maven installed, you can directly build the JAR file using command:
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```
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$ mvn clean package
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```
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Both of above steps will generate a target subdirectory which has the archive `target/hello-world-1.0-SNAPSHOT-jar-with-dependencies.jar` which will be used for creating function.
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- The archive created above will be used as a deploy package when creating the function.
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```
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$ fission env create --name jvm --image fission/jvm-env --version 2 --keeparchive=true
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$ fission fn create --name hello --deploy target/hello-world-1.0-SNAPSHOT-jar-with-dependencies.jar --env jvm --entrypoint io.fission.HelloWorld
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$ fission route create --function hello --url /hellop --method GET
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$ fission fn test --name hello
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Hello World!
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```
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