C++ and Java in a large application

[Ulf Reiman]

I have a large application environment built up in Java many java
classes, but now a have get code in C++ and wonder how a can get Java
and C++ to work together, can anyone give me some suggestion.

Regards
Ulf Reiman

 

[Gordon Beaton]

I have a large application environment built up in Java many java
classes, but now a have get code in C++ and wonder how a can get
Java and C++ to work together, can anyone give me some suggestion.

"work together" can mean many things. Be much more specific.

From Java you can use Runtime.exec() to run programs written in any
language, and similar mechanisms exist other languages that let you
run Java applications.

A Java application can use a Socket to connect to a server written in
any language (including C++), or use a ServerSocket to accept
connections from any client.

For a tighter coupling, JNI lets you invoke C or C++ methods directly
from Java, and vice versa:

http://java.sun.com/j2se/1.5.0/docs/guide/jni/index.html
http://java.sun.com/docs/books/jni/

/gordon

 

[Vitaly]

If you are using MS VC++ then get
http://simtel.net/product.php[id]93174[SiteID]simtel.net
or
http://simtel.net/product.php[id]93009[SiteID]simtel.net

 

[Ulf Reiman]

Thank you for your answer. So if you have functions in C++ classes that
uses functions in JAVA classes, is that possibly to do that JNI
/Ulf

 

[Gordon Beaton]

Thank you for your answer. So if you have functions in C++ classes
that uses functions in JAVA classes, is that possibly to do that JNI

Yes.

/gordon

 

[Ulf Reiman]

Is it possiby to use same memory space for varibles or do a need to
use set and get funtions to change variables used both i C++ and Java

/Ulf

 

[Ulf Reiman]

Yes i am using MS VC++ but what a did not understand get
http://simtel.net/product.php[id]93174[SiteID]simtel.net
or
what do you meant by that, i tried to klick on your link but a came to
http://simtel.net/welcome.php, how to go to product?

/Ulf

 

[Gordon Beaton]

Is it possiby to use same memory space for varibles or do a need to
use set and get funtions to change variables used both i C++ and Java

Did you read the links I posted in my first reply?

/gordon

 

[Chris Uppal]

Is it possiby to use same memory space for varibles or do a need to
use set and get funtions to change variables used both i C++ and Java

It's /much/ more complicated than that. See Sun's JNI tutorial for a start:

http://java.sun.com/docs/books/tutorial/native1.1/index.html

You'll now see why Gordon mentioned other ways of intergrating C++ and Java
programs before JNI.

If you still want to use JNI then read the JNI book. Downloadable (free) from:

http://java.sun.com/docs/books/jni/index.html

-- chris

 

[Chris Uppal]

http://java.sun.com/docs/books/tutorial/native1.1/index.html

Hmm. That link seems to be broken today. More worryingly, I can't find a link
from the main Java tutorial that even /claims/ to lead to the JNI tutorial...

-- chris

(PS, to Gordon, apologies for duplicating the links you'd already posted)

 

[Gordon Beaton]

(PS, to Gordon, apologies for duplicating the links you'd already posted)

You're free to duplicate *any* of the broken links I post...

/gordon

 

[Ulf Reiman]

So as a see it (after a short look on JNI) ,the only way to have a
function in Java that uses variables in C++ code is to us JNI, it not
trivial to understand JNI, or can it be easier to use CORBA. On the
other hand, does anyone have a better solution?

 

[Ulf Reiman]

So as a see it (after a short look on JNI) ,the only way to have a
function in Java that uses variables in C++ code is to us JNI, it not
trivial to understand JNI, or can it be easier to use CORBA. On the
other hand, does anyone have a better solution?

 

[Roedy Green]

Hmm. That link seems to be broken today. More worryingly, I can't find a link
from the main Java tutorial that even /claims/ to lead to the JNI tutorial.

I searched for a bout 15 minutes to no avail. There are some other
tutorials linked to from http://mindprod.com/jgloss/jni.html
under Sun tips.