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Re: PCRE supposedly no UTF support

From: PhilipNienhuis
Subject: Re: PCRE supposedly no UTF support
Date: Sun, 10 Nov 2013 06:11:53 -0800 (PST)

ahowe42 wrote
> Thanks Philip.  I know what java_invoke is; I think you're missing the
> point.  My issue is that I try to run java_invoke as 
> java_invoke ('org.octave.JDialogBox', 'questdlg', 'question');
> ,
> which is supposed to create an instance of the org.octave.JDialogBox.  I
> get the following error message.
> error: [java] java.lang.NoSuchMethodException: questdlg
> Since this is just invoking a java method from an existing class, this
> should work, but doesn't.

OK, sorry for my confusion.

But why would you try to invoke questdlg from the Java world, rather than
directly in Octave? 

Skipping that answer, maybe this trick that I often use could help you find
out how to call JDialogBox methods (tried in Octave-3.7.7+ but it should
work similarly in Octave-3.6.4 w java-1.2.9 package):

>> jq = javaObject ('org.octave.JDialogBox')
jq =

<Java object: org.octave.JDialogBox>

>> javamethods (jq)
warning: javamethods is obsolete and will be removed from a future version
of Octave, please use methods instead

  [1,1] = int[] listdlg(java.lang.String[], java.lang.String,
java.lang.Object[], java.lang.Object[], java.lang.String,
java.lang.String[], java.lang.String, java.lang.String)
  [1,2] = java.lang.String[] inputdlg(java.lang.String[], java.lang.String,
java.lang.Object[], java.lang.Object[])
  [1,3] = void SelectAll()
  [1,4] = int helpdlg(java.lang.String, java.lang.String)
  [1,5] = int emptydlg(java.lang.String, java.lang.String)
  [1,6] = java.lang.String questdlg(java.lang.String, java.lang.String,
  [1,7] = int errordlg(java.lang.String, java.lang.String)
  [1,8] = int warndlg(java.lang.String, java.lang.String)
  [1,9] = int genericdlg(java.lang.String[], java.lang.String[],
java.lang.String, java.lang.String, int,java.lang.Object[],
java.lang.Object[], java.lang.String, java.lang.String, java.lang.String)
  [1,10] = void closeDialog(int)
  [1,11] = void setFocus()
  [1,12] = void main(java.lang.String[])
  [1,13] = void wait(long) throws java.lang.InterruptedException
  [1,14] = void wait() throws java.lang.InterruptedException
  [1,15] = void wait(long, int) throws java.lang.InterruptedException
  [1,16] = boolean equals(java.lang.Object)
  [1,17] = java.lang.String toString()
  [1,18] = int hashCode()
  [1,19] = java.lang.Class getClass()
  [1,20] = void notify()
  [1,21] = void notifyAll()

...from which I tentatively conclude that you might be supplying not enough
parameters, of the proper class, to the questdlg call (through java_invoke).

Note that java_invoke is deprecated now, better use javaMethod()

FYI, the Java package author once informed me that error messages like 
"error: [java] java.lang.NoSuchMethodException: questdlg" 
are indeed appropriate because Java is a (very-) strictly-typed language and
(in this case) indeed has no methods for the actual set of parameters
(number, class) you supplied here.


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