RFR 8163482: java.net.URLPermission.getActions() adds a trailing colon when header-names is empty

[Vyom Tewari]

Hi All,

Please find the spec change for below issue.

BugId      : https://bugs.openjdk.java.net/browse/JDK-8163482

Webrev   : 
http://cr.openjdk.java.net/~vtewari/8163482/webrev0.0/index.html 
<http://cr.openjdk.java.net/%7Evtewari/8163482/webrev0.0/index.html>

The reason of this change  is a side effect of a recent past fix [1] 
changed the behavior of URLPermission to omit the colon separator when 
the request headers list is empty (the spec allows this). However some 
previously existing tests started failing [2] because of that.

As the spec allows the colon separator to be always  present, whether 
the request list is empty or not. For the sake of backward compatibility 
with existing code that might expect getActions() to always return a 
string containing a colon we chooses the conservative approach and 
continue to add the colon separator in all cases.

  [1] https://bugs.openjdk.java.net/browse/JDK-8114860
  [2] https://bugs.openjdk.java.net/browse/JDK-8161291

Note: i will file a CCC for this spec change.

Thanks,

Vyom