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Java.NET : Integration of Java and .NET

, 26 May 2008 CPOL
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A Approch To Integrate Java with .NET Web Application
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This article describes how we can integrate Java with Microsoft Technology. Sometimes we may need an application where we integrate both technologies. I am writing this article keeping all beginners in mind, so they can learn something from it. This article describes how we can call some Java methods from .NET code, and pass some values to Java or .NET and vice versa. This is a simple ASP.NET application, which interacts with Java Applets while performing another  operation. The application is very simple to do, but the main thing behind the scene is the idea and implementation logic.


I have used two IDE for this Application

  1. Visual Studio 2005
  2. Eclipse

This digaram describes the main flow between Java nad .NET.


The main concept behind the scene is Applet, I have created a JAR file which contains one applet and I have called Java methods using applet from .NET. Once you get the data using JavaScript, it is up to you to decide how you going to use it on the server side.

Using the Code

First of all, we have to create a JAR file using Java. As I already explained, I have used Eclipse, just take a look the hierarchy of my Java applet and function.


I have created these methods and created a "Jar" file, named JavaNet.Jar. Now I am going to interact with this using .NET. The following is the Java Applet code.

//Welcome Methods will call from .NET
public void WelcomeToJava()
  JOptionPane.showMessageDialog(null,"Hi .NET Welcome To Java");
//Return Value To .NET
public String  MessageForNetFromJava()
 return "Hi .NET, Nice To Meet you !!";	
//Take Argument from .NET and Reply
public String MessageFromNETServerSide(String Message)
 return "From Java : " + Message ;

Now, in the ASP.NET page, I have used an Applet tag for invoking the applet. Now from the ID, MyJavaApplet, I can call any Java methods from file.


The following is the JavaScript I'm using to call all Java methods

var ID= "<%=txtnum1.ClientID%>"; //Read Client ID of TextBox
//Call Java Welcome Message
function btnCallJava_onclick() 
// Get Message From Java
function btnNetMessage_onclick() {
var message=MyJavaApplet.MessageForNetFromJava();
//Pass Argument To Java Methods
function btnServerValueSend_onclick()
   var Message= document.getElementById(ID);
   var result=MyJavaApplet.MessageFromNETServerSide(Message.value);


Call Welcome Message


Send Server Side Value To Java


Get Message From Java


Points of Interest

.NET and Java, both are leading the world's technology, and by integreting both of them we can do anything we want to do .


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Abhijit Jana
Technical Lead
India India
.NET Consultant | Former Microsoft MVP - ASP.NET | CodeProject MVP, Mentor, Insiders| Technology Evangelist | Author | Speaker | Geek | Blogger | Husband
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Twitter : @AbhijitJana
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Comments and Discussions

QuestionBrowser hangs when I clicked on Call Java and In my defaul.aspx file under Applet tag code="" shows was not found. Pinmembersachinsshelake27-Nov-12 22:35 
GeneralMy vote of 5 PinmemberMassimo Conti14-Jul-12 5:56 
GeneralMy vote of 2 PinmemberMarcelo Lujan [El Bebe.Net ]22-Feb-12 17:56 
QuestionThanks Pinmembersanya.fesak21-Sep-11 20:06 
Generaljava document PinmemberTarık Murat18-May-10 2:53 
GeneralMy vote of 1 PinmemberMeneDev10-May-10 8:50 
This is not *integrating* Java and .Net
GeneralGreat PinmemberBrij23-Dec-08 3:58 
GeneralRe: Great PinmvpAbhijit Jana18-Oct-09 12:25 
GeneralInteresting... Pinmemberstevjhon17-Oct-08 6:37 
GeneralRe: Interesting... PinmvpAbhijit Jana18-Oct-09 12:25 
QuestionWhere is the .NET part? PinmemberVictor van Hagen26-May-08 10:47 
AnswerRe: Where is the .NET part? PinmemberAbhijit Jana26-May-08 17:35 
GeneralRe: Where is the .NET part? PinmemberN a v a n e e t h26-May-08 18:51 
GeneralRe: Where is the .NET part? PinmemberVictor van Hagen27-May-08 3:16 
Questioncan you do this without javascript? Pinmembermattvil26-May-08 5:15 
GeneralInteresting, but the Web Services are better solution PinmemberStoyan K Petrov26-May-08 4:11 
GeneralSuperb !!! Pinmemberashu fouzdar21-May-08 4:31 
GeneralRe: Superb !!! PinmemberAbhijit Jana21-May-08 7:07 
GeneralGreat Effort!!! Pinmember SAMir Nigam 19-May-08 19:11 
GeneralRe: Great Effort!!! PinmemberAbhijit Jana19-May-08 19:39 

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