HOWTO: Using a Java Class with Active Server Pages

ID: Q167941

The information in this article applies to:

Microsoft Win32 Virtual Machine

SUMMARY

This article demonstrates how one can use a Java class as an ActiveX server side object with Microsoft Active Server Pages (ASP).

MORE INFORMATION

The following steps show how to use a Java Server Object with ASP:

Install the Microsoft virtual machine (Microsoft VM) (Build 1518 or newer) (Microsoft Visual J++ 1.1 comes with build 1513). You can check the version of the Msjava.dll in your windows/system or winnt/system32 directory to verify what build of the Microsoft VM you have in your system. You can download the latest VM from http://www.microsoft.com/java.

Create your Java class, which will be created as a COM object. For example:


// SIMPLE.JAVA-------------
public class Simple
{
   public int SimpleFn ( int x )
   {
      return x * 2;
   }
}

Compile the .java file into a .class file, that is:
```
     jvc simple.java 
```
NOTE: This does not require that you use the Microsoft compiler for Java, JAVAC works just fine.

Copy the resulting .class file into the %windir%\java\trustlib or %windir%\java\lib directory of the server machine. Note that you may have to restart the Microsoft VM if you copy over a preexisting class file. To restart the Microsoft VM on the server side go to Microsoft Internet Service Manager (IIS) and stop and then restart all three IIS services (that is, www, gopher, ftp).
```
      copy simple.class \winnt\java\trustlib 
```

Register your Java class as a COM object on the server machine using the JavaReg utility (available with Visual J++ or the Microsoft SDK for Java). This can also be done manually or by a setup program, "javareg /register" is only creating registry entries:
```
      javareg /register /class:Simple /progid:Simple 
```
The /class: argument is the name of the .class file in your trustlib or lib directory. The /progid: is the name that you will use in CreateObject() to create your COM object.

Now your Java class is registered as a COM object and ready to use from Active Server Pages.

Create an .asp file in an HTTP shared directory on your computer. Be sure that the directory the file is in has EXECUTE access. You can check this in the "Microsoft Internet Service Manager." A simple ASP file would look like:
```
SIMPLE.ASP-------------
<html><body>
<h1>Simple Test</ 
```
h1> The result from SIMPLE is:
```
   <% Set SimpleObj = Server.CreateObject("Simple") %>
   <% = SimpleObj.SimpleFn(5) %>
   <hr>
   </body></html>
   ------------------------ 
```

Open your Web browser and point to YOUR_MACHINE/simple.asp.

REFERENCES

For additional information on how to find the latest Microsoft VM, please see the following article in the Microsoft Knowledge Base:

Q163637 Availability of Current Build of Microsoft VM

Additional information and Active Server Pages samples can be found at

http://msdn.microsoft.com/workshop/server/default.asp

For the latest Knowledge Base articles and other support information on Visual J++ and the SDK for Java, see the following pages on the Microsoft Technical Support site:

http://support.microsoft.com/support/visualj/

http://support.microsoft.com/support/java/

Additional query words: ASP java server com CreateObject


Keywords          : JCOM 
Version           : 1.0 1.1
Platform          : WINDOWS 
Issue type        : kbhowto

Last Reviewed: July 27, 1999