I have Eclipse 3.4 installed on my system and getting issues while installing the PMD plugin.
I did the following for the installation.
Started Eclipse and selected Help --> Software Updates… --> Available Software --> Add Site…
Entered the URL "http://pmd.sf.net/eclipse" for Location and checked the checkbox against the URL.
The fetching process didn't complete and I got the following error
I tried with the URL "http://pmd.sourceforge.net/eclipse" too and got the same error.
Then I thought of setting the proxy cofiguration and selected Window --> Preferences --> General --> Network Connections
In Network Connections enabled the Manual proxy configuration and clicked on OK.
Then, again tried with the plugin installaion but got the same error.