FULL PRODUCT VERSION :
Java Web Start 1.6.0_11
Using version JRE 1.4.2_18 Java HotSpot(TM) Client VM

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [version 5.1.2600], using IE7

EXTRA RELEVANT SYSTEM CONFIGURATION :
proxy.pac

A DESCRIPTION OF THE PROBLEM :
When using IE6, proxy.pac is properly parsed and the application is bypassing our proxy. Simply upgrading to IE7 causes the application to try and use our proxy (although the proxy.pac instructs it not to). I understand that JSE 1.4 has limitations with regard to pac scripts, but one can wonder why it is not broken
either when using IE or when removing JWS 1.6.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Define a proxy.pac in IE7 instructing isPlainHostname() to go direct and the rest to use a proxy, and run an application.jnlp that will break when routed through said proxy.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No exception due to application being improperly directed through a proxy
ACTUAL -
Exception due to application being improperly directed through a proxy

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NullPointerException

at com.myapp.common.jive.tools.ClassTools.getClassLocation(ClassTools.java:102)

at com.myapp.common.jive.tools.MessageTools.getBundle(MessageTools.java:143)

at com.myapp.common.jive.tools.MessageTools.getJiveBundle(MessageTools.java:226)

at com.myapp.common.jive.exception.AbstractFmkRuntimeException.getBundle(AbstractFmkRuntimeException.java:150)

at com.myapp.common.jive.exception.ServiceException.getBundle(ServiceException.java:58)

at com.myapp.common.jive.exception.AbstractFmkRuntimeException.<init>(AbstractFmkRuntimeException.java:81)

at com.myapp.common.jive.exception.AbstractFmkRuntimeException.<init>(AbstractFmkRuntimeException.java:62)

at com.myapp.common.jive.exception.ServiceException.<init>(ServiceException.java:31)

at com.myapp.common.jive.exception.CommunicationServiceException.<init>(CommunicationServiceException.java:25)

at com.myapp.common.jive.call.client.ClientCPSHandler.invoke(ClientCPSHandler.java:108)

at $Proxy0.lisEvenements(Unknown Source)
-snip-

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
defining if (host=="java.sun.com") return "DIRECT" in the proxy pac,
or using IE6
or removing JWS1.6