Microsoft KB Archive/171631

= Error Message: Error J0051: Undefined Package 'Java.Lang' =

Article ID: 171631

Article Last Modified on 12/5/2003

-

APPLIES TO


 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 4.01 128-Bit Edition
 * Microsoft Internet Explorer 4.0 128-Bit Edition
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 4.01 128-Bit Edition
 * Microsoft Internet Explorer 4.0 128-Bit Edition

-



This article was previously published under Q171631



WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.



SYMPTOMS
When you try to compile a Java class using JVC (Microsoft's Java compiler), you may receive the following error message:

error J0051: Undefined package 'java.lang'



CAUSE
This behavior is caused by the Classes.zip file not being present after you install Internet Explorer.



RESOLUTION
WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

NOTE: For information about how to edit the registry, see the online Help in Registry Editor.

To resolve this issue, follow these steps:

 Click Start, and then click Run. Type clspack -auto in the Open box, and then click OK.

NOTE: This process can take up to two minutes, and during this time no progress indicator is visible. Try to compile a Java class using JVC. If you are still unable to compile, continue to the next step. Use Registry Editor to verify that the key listed below is present. If the key is present, verify that it has the value listed below. If needed, edit the value to match the value listed below. If the key is not present, create it with the value shown here.

HKEY_LOCAL_MACHINE\Software\Microsoft\Java VM\Classpath

\java\classes\classes.zip

Note that is the folder in which you have Windows 95 or Windows NT 4.0 installed.



MORE INFORMATION
For additional information about how to determine which folder Windows is installed in, click the article number below to view the article in the Microsoft Knowledge Base:

305792 How to Determine Which Folder Windows Is Installed In

Additional query words: 4.00

Keywords: kberrmsg KB171631

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.