Use specific Java path for Play! Framework

Question

With the the experimental goal in mind of making a completely portable Play! application, without worrying about whether the host machine has Play! or even Java, I'm trying to find a way to tell Play! where to look for Java, rather than looking at the environment variable JAVA_HOME.

Bundling the framework itself with the application isn't very difficult, and I have even found a way to "embed" MySQL, but I haven't found a way to bundle Java and make Play! use the JRE I have in the same directory. Is this possible?

Alexander Ponomarenko · Accepted Answer · 2012-03-01 19:33:52Z

7

How are you starting Play? If you why not just add start.sh/start.bat that will set JAVA_HOME to current_folder/jdk?

You can also package your Play application as WAR file and use with portable tomcat or other web server.

Per Play command description:

~ The script first tries to locate the java command using the $JAVA_HOME environment variable (from $JAVA_HOME/bin). ~ If the $JAVA_HOME variable is not defined, the default java command available from the PATH is used.

So you can try to add Java/bin to your path, or try to add "java" to your working directory where you start play.

As a last option, you can modify play\framework\pym\play\application.py and add your path directly in it, modify this part:

   def java_path(self):
        if not os.environ.has_key('JAVA_HOME'):
            return "java"
        else:
            return os.path.normpath("%s/bin/java" % os.environ['JAVA_HOME'])

answered Mar 1, 2012 at 19:33

Alexander Ponomarenko

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2 Comments

Indigenuity Over a year ago

I ended up pasting JDK 1.7 into Play 1.2.4, and pasting that into my project. Never done a bat before, so it was tricky to figure out the path from a .bat file, but I just stuck this line in play.bat: set JAVA_HOME=%~dp0\jdk1.7.0

Indigenuity Over a year ago

And Thank you very much for pointing out where I could change the python code. VERY instructive. I was using that solution at first, but I decided changing the play.bat was a safer, more portable method.

Benj · Accepted Answer · 2016-11-30 14:35:42Z

1

In complement to @AlexanderPonomarenko's answer and @Indigenuity's comment (they both got the point), here is the workaround that works for me on Win7 x64 with Play 1.4.2:

I edited the play.bat file located at Play's root, and setted its content to :

echo off
set "JAVA_HOME=C:\Program Files (x86)\Java\jre1.8.0_112"
"%~dp0python\python.exe" "%~dp0play" %*

Note that this works for my use case with Java 8u112 x86, you have to set it to what you need.

Also note the syntax for declaring the JAVA_HOME enclosed into double quotes because of the spaces.

Enjoy :)

answered Nov 30, 2016 at 14:35

Benj

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