Heroku run Jar from Javascript

Question

I'm trying to execute a Jar file from a Javascript file to get the console output. I've pushed both files to Heroku, but when I try calling the function in the js file, I get this error:

/bin/sh: 1: java: not found exec error: Error: Command failed: java -jar -Xms1024m MongoConnector-all abaabaa

[31merror[39m: RangeError: Maximum call stack size exceeded

This is the code that I have:

const runCoreSearch = function(searchInputString) {
  const exec = require('child_process').exec;
  //child = exec('/usr/bin/java -jar ~/Applications/Mongo Connector-all.jar' + rakeInputString,
  const child = exec('java -jar -Xms1024m MongoConnector-all ' + searchInputString,
  function (error, stdout, stderr){
...

On their website (https://devcenter.heroku.com/articles/deploying-executable-jar-files) it says to use the command "heroku deploy:", but I'm not trying to deploy a Java project, just execute the jar from a node.js project. Any ideas?

codefinger · Accepted Answer · 2017-10-10 21:57:13Z

6

You'll need to add the heroku/jvm buildpack to your app and redeploy:

$ heroku buildpacks:add heroku/jvm
$ git commit -m "redeploy" --allow-empty
$ git push heroku master

This will install the java command into your dyno.

answered Oct 10, 2017 at 21:57

codefinger

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Maude · Accepted Answer · 2018-08-30 20:36:33Z

1

I did codefinger's solution but got the following error :

Picked up JAVA_TOOL_OPTIONS -Xmx300m -Xss512k -Dfile.encoding=UTF-8 
Error : A JNI error has occured, please check you installation and try again 
Exception in thread "main" java.lang.UnsupportedClassVersionError: myClass has been compiled by a more recent version of the Java Runtime (class file version 54.0)...this java version only recognize version up to 52.0

To fix this,

Create a file named system.properties in the root of your folder
Add java.runtime.version=XX where XX is the current version of your jdk/jre
Push the code to heroku

Documentation : https://devcenter.heroku.com/articles/java-support#supported-java-versions

answered Aug 30, 2018 at 20:36

Maude

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