Opera crashes after jdk13 install

[James McNaughton]

Native FreeBSD Opera was working fine until I installed jdk1.3.1 from
the ports. Now it crashes on startup whentrying to load the plugins.

This is the reported error when starting from an xterm:

  INTERNAL ERROR on Browser End: Could not load libjavaplugin_oji.so:
  linking error=/home/jtm/.netscape/java/lib/libjavaplugin_oji.so:
  Undefined symbol "PR_NewMonitor"

  System error?:: Unknown error: 0

The java plugin seems to work OK with Mozilla. Any pointers would be
appreciated.

TIA