It appears that SAP Business Connector is effectively coming to end-of-life next March. Can this be the case?
1) SUN has started the Java 1.3.1 end-of-life process. The end-of-life is currently set to March 30, 2006. See http://java.sun.com/j2se/1.3/download.html for details.
2) SAP Business Connector 4.7 supports JDK 1.3.1 but has no planned support for subsequent JDKs. See SAP Note 309834 for details.