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MathGroup Archive 2006

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Re: JLink : JavaNew Failure

  • To: mathgroup at
  • Subject: [mg66274] Re: JLink : JavaNew Failure
  • From: David Bailey <dave at>
  • Date: Sat, 6 May 2006 01:55:16 -0400 (EDT)
  • References: <e3f600$sat$>
  • Sender: owner-wri-mathgroup at

karenechu at wrote:
> Hello, everyone,
> I am very new to J/Link but I  have been fiddling with it for a while
> but I just don't see what was wrong:
> I wrote a hello world program in Java and compiled it and put it in a
> folder. Then I tried to call it from Mathematica using:
> Needs["JLink`"];
> InstallJava[CommandLine->"home/usr/java/bin/java"];
> AddToClassPath["home/myclasses"];
> LoadJavaClass["test"];
> All these go well with the new class path added and
> JavaClass["test",9] as output to the last line, but when:
> test1= JavaNew["test"];
> Mathematica failed to created object because " there is no constructor
> that takes zero arguments"   even though I put in an explicit
> constructor that takes no argument.
> I tried putting in a constructor taking an int as an argument and using
> test1= JavaNew["test",1]; (after reinstalling Java etc)
> but now the type of the argument is wrong.
> I think the class is either not properly loaded or something, but I
> just dont' know what is wrong!!
> Please help!
> Thanks a lot, 
> cheers,
> Kay

Perhaps you should post your Java declaration of the constructor for 
test - a common mistake is to forget to make the constructor (and 
class!) public.

David Bailey

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