INFO: Frequently Asked Questions for Visual J++

• Microsoft Win32 Virtual Machine

SUMMARY

This article covers some of the most Frequently Asked Questions (FAQ) about the Microsoft Visual J++ product. For more information on the Microsoft Visual J++ product see the following Web site:

http://msdn.microsoft.com/visualj/

http://msdn.microsoft.com/visualj/technical/support.asp

http://support.microsoft.com/support

MORE INFORMATION

This section is organized into the following sub-sections:

1. General questions



2. Installation questions



3. Compiler questions



4. Debugger questions



5. ActiveX/COM integration questions



6. Microsoft VM and SDK questions

1. General Questions

public class Wait
{
   public static void main(String args[]) throws java.io.IOException
   {
      System.out.println("Hello\n");
      System.in.read();
   }
} 

1. Start Internet Explorer.



2. From the View menu, select Options.



3. Click the Advanced tab.



4. Select the "Enable Java logging" check box.



5. Click OK.



6. Restart Internet Explorer

1. Start Internet Explorer



2. From the View menu, select Options.



3. Click the Advanced tab.



4. Select the "Java logging enabled" check box and the "Java console enabled" check box.



5. Click OK.



6. Restart Internet Explorer.

 // File Test.java, requires DialogLayout.java and
// IDD_DIALOG1.java be created via the Resource Wizard
 import java.awt.*;
 public class Test
 {
    public static void main(String args[])
    {
       Frame frame=new Frame("Test Frame");

       // Resource Wizard generated code does a getFont
       // call, since Frame doesn't have a default font
       // we need to set one.
       Font font=new Font("Dialog",Font.PLAIN,12);
       frame.setFont(font);

       // Create the Wizard generated layout manager
       // with the frame class as parent
       IDD_DIALOG1 myLayout=new IDD_DIALOG1(frame);
       myLayout.CreateControls();

       frame.show();

       // Wait around so we can see the frame created
       // CTRL+C on the jview window to destroy frame
       while(true);
    }
 } 

2. Installation Questions

• Autorun.inf will not auto-execute setup upon placing the CD in the drive.



• If Setup.exe is executed manually by using the Run option from the Start menu, the error message "Cannot find the file '[drive letter]:\setup.exe' (or one of its components)" appears. Make sure the path and filename are correct and that all required libraries are available. (NOTE: If the default path in the environment includes a directory where another Setup.exe file resides, this file will be found and executed instead of the Visual J++ setup).



• If Setup.exe is executed manually by double-clicking on the file name in Explorer, the "Program Not Found" dialog box appears. (Note: If the default path in the environment includes a directory where another Setup.exe file resides, this file will be found and executed instead of the Visual J++ setup).



• Certain folders on the CD will not open. Instead, the error message "The folder '[drive letter]:\foldername' does not exist" appears. The following folders will not open:
  
  
  • Cab&Sign
  
  
  
  • Cool Too(ls)
  
  
  
  • MSDev
  
  
  
  • Welcome
  
  
  

Q157877 PRB: Visual J++ Requires a Protected Mode CD-ROM

Q125630 Joliet Specification for CD-ROM

Q157618 Installing VJ++ Upgrades Certain VC++ Components

3. Compiler Questions

4. Debugger Questions

public class Loop
{
   public static void main(String[] argv)
   {
   // Create n here at method scope to workaround
   // e.g. int n=0;
      for (int n=0; n<10 ; n++)
      {   // First instance of n is viewable in the debugger
         System.out.println(n);
      }
      System.out.println();
      for (int n=0; n<10 ; n++)
      {   // Second instance of n is not viewable in the debugger
         System.out.println(n);
      }
   }
} 

5. ActiveX/COM Integration Questions

1. First you must install the Microsoft virtual machine (Microsoft VM) build 1257 or newer. You can download the latest VM from http://www.microsoft.com/java/. For more information on how to find the latest Microsoft VM, see the Microsoft Knowledge Base article:

   Q163637: Availability of Current Build of Microsoft VM




2. Next you must create your Java class that will be created as a COM object--something such as the following:

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




3. Compile the .java file into a .class file

   
         jvc simple.java 

1. Copy the resulting .class file into the Java\Trustlib folder of the server machine. Note that you may have to restart the Microsoft VM if you copy over a pre-existing executing class file

   
         copy simple.class \winnt\java\trustlib 




2. Register your Java class as a COM object on the server machine using the JavaReg utility (available with VJ++ or the Microsoft Java SDK). 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 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.



3. Create an .asp file in a HTTP shared folder on your machine. Be sure that the folder the file is in has EXECUTE access. You can check this in the "Microsoft Internet Service Manager." A simple ASP file would look like this:

   
   SIMPLE.ASP-------------
      <html><body>
      <h1>Simple Test</h1>
   
      The result from SIMPLE is:
      <% Set SimpleObj = Server.CreateObject("Simple") %>
      <% = SimpleObj.SimpleFn(5) %>
   
      <hr>
      </body></html>
   ------------------------ 




4. That's it! Open your Web browser and point it at YOUR_MACHINE/Simple.asp.

//   NOTE - ClassWizard will maintain method information here.
//   Use extreme caution when editing this section.
//{{AFX_ODL_METHOD(PtrTest)
[id(1)] void pStrTest( [in, out] BSTR* arg1);
[id(2)] void pLongTest( [in, out] long* arg1);
//}}AFX_ODL_METHOD 

6. Microsoft VM and SDK Questions

REFERENCES

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:

Keywords          : kbcode kberrmsg kbsetup kbtool kbusage kbCommandLine kbDebug kbide kbVJ JCOM JVM 
Version           : WINDOWS:
Platform          : WINDOWS 
Issue type        : kbhowto 

Last Reviewed: July 27, 1999