PRB: Visual J++ 6.0 Code Generator Can Generate Ambiguous Names

ID: Q194770

The information in this article applies to:

Microsoft Visual J++, version 6.0

SYMPTOMS

When compiling code from the code generator and wizards in a Windows Foundation Classes (WFC) application, one of the following errors may occur:

   Class 'class' doesn't have a method that matches 'method()' (J0078)

   -or-

   Class 'class' doesn't have a constructor that matches 'class()' (J0082)
   'field' is not a field in class 'class' (J0234)

CAUSE

The following import statements are made by the wizards and designer code generators:

   import com.ms.wfc.app.*;
   import com.ms.wfc.core.*;
   import com.ms.wfc.ui.*;
   import com.ms.wfc.html.*;

These imports can cause name collisions if your application defines classes in different packages with the same name as those in the WFC packages.

RESOLUTION

If you must import a package that has class names that conflict with the above import statements, you must make sure all of your code uses the fully qualified class names. If you define a class in the default package that conflicts with the above import statements, you must also make sure all of your code uses the fully qualified class names. This includes changing code that was generated by the wizards and Form Designer, for example changing "new Point(300,300)" to "new com.ms.wfc.ui.Point(300,300)".

STATUS

This behavior is by design.

MORE INFORMATION

In some cases the Form Designer's code generator will generate code that you will need to fully qualify. If the section of code requiring editing is gray (read-only), you must first close the Form Designer window before making your changes to the Java file. Warning: making future changes in the Form Designer might change your code back to non-fully qualified names.

Steps to Reproduce Behavior

1. From the File menu, select New Project.

2. Click the New tab.

3. Select Applications Folder under Visual J++ Projects.

4. Select the Windows Application icon.

5. Click Open.

6. From the Project menu, select Add Class.

7. Change the name field to Point.java.

8. Click Open.

9. From the Build menu, select Rebuild.

   You will get the following errors listed in the Task-List:

     Class 'Control' doesn't have a method that matches 'setSize(Point)'
        (J0078)
     Class 'Point' doesn't have a constructor that matches 'Point(int,int)'
        (J0082)

10. To workaround the errors, double-click one of the above errors and

   change the statement from

      this.setSize (new Point(300,300));

   to:

      this.setSize (new com.ms.wfc.ui.Point(300,300));

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          : kbide kbVJ600 
Version           : WINDOWS:6.0
Platform          : WINDOWS
Issue type        : kbprb

Last Reviewed: October 27, 1998