Use DNSJAVA as DNS SPI

lib/felix.client.run.properties

@@ -22,7 +22,8 @@ org.osgi.framework.system.packages.extra= \
  sun.net.util; \
  sun.net.dns; \
  sun.security.action; \
- sun.security.pkcs11;
+ sun.security.pkcs11; \
+ org.xbill.DNS
 
 felix.auto.start.10= \
  reference:file:lib/bundle/org.apache.felix.bundlerepository-1.6.4.jar

src/net/java/sip/communicator/launcher/SIPCommunicator.java

@@ -58,6 +58,10 @@ public class SIPCommunicator
     public static void main(String[] args)
         throws Exception
     {
+        // this needs to be set before any DNS lookup is run (which includes the
+        // Java SecurityManager)
+        System.setProperty("sun.net.spi.nameservice.provider.1", "dns,dnsjava");
+
         String version = System.getProperty("java.version");
         String vmVendor = System.getProperty("java.vendor");
         String osName = System.getProperty("os.name");