After updating to the latest version (1.359), Hudson throw InvalidClassVersionErrors. So I updated Java from version 1.5 to 6. While these errors do not exist anymore, Hudson is still not loaded completely but only shows the "Hudson is starting, please wait" page in the web browser.

There are some errors in the attached log but I think they are not related.

A thread dump, however, show this stacktrace:

"hudson initialization thread" prio=10 tid=0x0a3a2800 nid=0x1bbc in Object.wait() [0xb4162000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)

• waiting on <0x82e65d20> (a javax.jmdns.impl.ServiceInfoImpl)
  at java.lang.Object.wait(Object.java:485)
  at javax.jmdns.impl.JmDNSImpl.registerService(JmDNSImpl.java:723)
• locked <0x82e65d20> (a javax.jmdns.impl.ServiceInfoImpl)
  at hudson.DNSMultiCast.<init>(DNSMultiCast.java:36)
  at hudson.model.Hudson.<init>(Hudson.java:628)
  at hudson.model.Hudson.<init>(Hudson.java:545)
  at hudson.WebAppMain$2.run(WebAppMain.java:222)

Hudson is running as a non root user in a choot environment on Ubuntu 9.10