title: Smack Exception - caused by my Java installation or by Smack
body: <p>I'm using Smack API to develop a multi-user gaming client. 
  I've got a problem with my smack application: i can send messages and requests to the server, but my application can't read responses from it.</p>
  
  <pre><code>Exception in thread "Smack Packet Reader (0)" java.lang.ExceptionInInitializerError
            at java.lang.Class.forName0(Native Method)
            at java.lang.Class.forName(Class.java:169)
            at org.jivesoftware.smack.provider.ProviderManager.initialize(ProviderManager.java :193)
            at org.jivesoftware.smack.provider.ProviderManager.&lt;init&gt;(ProviderManager.java:436 )
            at org.jivesoftware.smack.provider.ProviderManager.getInstance(ProviderManager.jav a:134)
            at org.jivesoftware.smack.util.PacketParserUtils.parseIQ(PacketParserUtils.java:30 3)
            at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:229)
            at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:43)
            at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:70)
  Caused by: java.lang.NullPointerException
            at java.util.TimeZone.parseCustomTimeZone(TimeZone.java:767)
            at java.util.TimeZone.getTimeZone(TimeZone.java:471)
            at java.util.TimeZone.getTimeZone(TimeZone.java:465)
            at org.jivesoftware.smackx.workgroup.packet.TranscriptsProvider.&lt;clinit&gt;(Transcrip tsProvider.java:44)
            ... 9 more
  No response from the server.:
  </code></pre>
  
  <p>It's not a network (firewall, nat...) problem (on another Macintosh in the same subnet, the same code runs well with no exceptions). I checked my MacOS firewall and it seems ok...what can I do to resolve this issue?
  I don't know if this issue depends on java or Smack...
  Thanks in advance.</p>