WLS 6.1 sp3 server won't start with rh7.2

[quan nump]

i've tried a fresh install of WLS 6.1 sp3 on a red hat 7.2 box with jdk 1.3.1_04 and the server will not start.
I've tried the mydomain and the examples servers.
I've tried with and without running setEnv.sh prior to startWeblogic.sh.
I thought it could've been a classpath problem so i tried taking the cp down to just the weblogic.jar, but the results were the same.
full output of startWeblogic.sh:

LD_LIBRARY_PATH=/home/walker/bea/wlserver6.1/lib/linux/i686:/home/walker/bea/wlserver6.1/lib/linux/i686/oci817_8
PATH=/home/walker/bea/wlserver6.1/bin:/usr/java/jdk1.3.1_04/jre/bin:/usr/java/jdk1.3.1_04/bin:/home/walker/bea/wlserver6.1/lib/linux:/bin:/usr/bin:/usr/X11R6/
in:/usr/local/bin:/usr/java/jdk1.3.1_04/bin
CLASSPATH=/home/walker/bea/wlserver6.1:/home/walker/bea/wlserver6.1/lib/weblogic_sp.jar:/home/walker/bea/wlserver6.1/lib/weblogic.jar
***************************************************
*  To start WebLogic Server, use the password     *
*  assigned to the system user.  The system       *
*  username and password must also be used to     *
*  access the WebLogic Server console from a web  *
*  browser.                                       *
***************************************************
<Aug 5, 2002 3:46:39 PM PDT> <Info> <Security> <Getting boot password from user.>
Enter password to boot WebLogic server:
***************************************************************************
The WebLogic Server did not start up properly.
Exception raised:
java.lang.SecurityException: sealing violation
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:229)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:51)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:488)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:106)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:243)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:51)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:287)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:281)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:488)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:106)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:243)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:51)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:281)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)
        at weblogic.t3.srvr.T3Srvr.checkAccess(T3Srvr.java:290)
        at weblogic.t3.srvr.T3Srvr.initialize(T3Srvr.java:347)
        at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:206)
        at weblogic.Server.main(Server.java:35)
Reason: Fatal initialization exception
***************************************************************************

[quan nump]

i removed xerces jars from my $JRE/lib/ext,
everything works now