call jar file from ruby class

Question

How to call jar file (a java archive file) from ruby class. And access the functions/methods from it.

I am refering the following link

But I am getting the following error:

'require': cannot load such file -- /tmp/Test.jar (LoadError)

How can I resolve this issue.

John Moore · Answer 1 · 2013-06-09T23:44:10.497

You can use a system call. You may have performance issues if you have lots of users, but for most this should work:

# Create a directory (in this sample called "jars") inside public directory and move your jar file inside the newly created directory.

def externaljar

 argsA = ""
 argsB = ""

    Dir.chdir("#{RAILS_ROOT}/public/jars/") do

        # Use your path to the java according to the java directory installed in your machine.

        retResult  = system("/home/user/java/jdk1.7.0/bin/java -jar JSpell.jar #{argsA} #{argsB}")

    end #chdir
 end

score 1 · Answer 2 · answered Mar 02 '13 at 11:59

1

You can't call Java code from Ruby. You might want to have a look at JRuby. JRuby is what the guy from your link uses, you can see it when he types jruby Main.rb in the console.

answered Mar 02 '13 at 11:59

enthrops

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Can i call a function from jar file ? – user1881251 Mar 02 '13 at 12:01
@user1881251 Not from MRI (standard Ruby). Get JRuby. Or mess with bindings from C to Java. You might want to go with JRuby at this point – enthrops Mar 02 '13 at 12:03
This is not correct. You can make system calls within MRI to call a jar. See Open3 in the MRI std-lib. – John May 18 '15 at 00:45

call jar file from ruby class

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