Policy Setup Information

Type 

policytool
at your command prompt (assuming jdk 1.2 is properly installed - it is recommended to back up your .java.policy file if you have one). Click on 
Add Policy Entry
In the CodeBase textbox enter 
http://www-db.cs.wisc.edu/niagara/-
Leave SignedBy empty. Click on 
Add Permission
A new window will pop up. There under the permission list box you will find 
AllPermission
Check it and click OK and then Done. Click File, Save. Save you policy file as .java.policy.

The above procedure will allow you to test the join feature.

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