The legacy software WILL NOT work for 1.5. It is a new, untested version of the Java SDK. It is not accepted in the programmer's world yet.
APIs such as Apache Tomcat do not even support 1.5.
It is well known that the 1.5 JDK is not the current norm and does not work for all APIs, etc.
My question is would the same legacy problems occur with the minor update from 1.4.2_08 to 1.4.2_10.