Hi, Well, I restarted my machine and the error is gone !  Hopefully I dont encounter this problem again Thanks, Zayed ________________________________ From: M Z <itsz2933(a)yahoo.com&gt; To: rules-issues(a)lists.jboss.org Sent: Monday, August 3, 2009 11:34:40 PM Subject: [rules-issues] Drools EXCEPTION_ACCESS_VIOLATION Hi, When I try executing PricingRuleDTExample.java I get the following error. # # An unexpected error has been detected by HotSpot Virtual Machine: # # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d743ea4, pid=4636, tid=4696 # # Java VM: Java HotSpot(TM) Client VM (1.5.0_19-b02 mixed mode, sharing) # Problematic frame: # V [jvm.dll+0x103ea4] # # An error report file with more information is saved as hs_err_pid4636.log # # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash..jsp #   Any help/pointers please Drools 5.0 Java 1.5. Eclipse 3.4.2   (I searched online for the above error and found some post which suggests the problem  may be with jxls, hence posting here)   Thanks in Advance Zayed