Integration

I'm running iWS 6.0 SP6 on Solaris 8. The web server works fine with the built-in JRE 1.2.2. However, if I try to switch to the JDK 1.3.1_03 (installed to /usr/java), the server will not start.
I can't figure it out. The error log says this:

[31/Jul/2003:22:10:24] info ( 1260): successful server startup
[31/Jul/2003:22:10:24] info ( 1260): iPlanet-WebServer-Enterprise/6.0SP6 B06/23/2003 14:40
[31/Jul/2003:22:10:24] info ( 1261): Installing a new configuration
[31/Jul/2003:22:10:24] info ( 1261): [LS ls1] http://webserver, port 80 ready to accept requests
[31/Jul/2003:22:10:24] info ( 1261): A new configuration was successfully installed
[31/Jul/2003:22:10:24] config ( 1261): There was an error trying to initialize the HPI library.
[31/Jul/2003:22:10:24] config ( 1261):

[31/Jul/2003:22:10:24] config ( 1261): Please check your installation, HotSpot does not work correctly
[31/Jul/2003:22:10:24] config ( 1261):

[31/Jul/2003:22:10:24] config ( 1261): when installed in the JDK 1.2 Solaris Production Release, or
[31/Jul/2003:22:10:24] config ( 1261):

[31/Jul/2003:22:10:24] config ( 1261): with any JDK 1.1.x release.
[31/Jul/2003:22:10:24] config ( 1261):

[31/Jul/2003:22:10:24] info ( 1261): Internal error: unable to create JVM
[31/Jul/2003:22:10:24] failure ( 1261): Failure to load JVM (check your JRE)
[31/Jul/2003:22:10:24] failure ( 1261): Late initialization failed: Error running init function(late) NSServletLateInit: unknown error