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A list of potential compatibility problems is provided by Sun: http://java.sun.com/j2se/1.5.0/compatibility.html.
Have you encountered other problems when running/testing old-1.4-applications against Java 5 (e.g. A specific library no longer working ….)?
You may discover an alternative list of backward compatibility problems in all versions of JDK including 1.4 and 1.5 at the following web-sites:
JDK-Results at Japitools Home Page:
Test results for JDK at Java Upstream Tracker:
These results were obtained by static analysis tools and can be used together with the official compatibility notes (Incompatibilities in J2SE 5.0 since 1.4.2 from Sun/Oracle).