UnsupportedClassVersionError in gwt-sl 1.0 on Java 1.5

[Athos]

I get this error for GWTHandler since upgrading gwt-sl from 0.1.5b to
1.0.

org.springframework.beans.factory.BeanCreationException: Error
creating bean with name
'org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping#0'
defined in class path resource [gwt-common-context.xml]:
Initialization of bean failed; nested exception is
org.springframework.beans.factory.CannotLoadBeanClassException: Error
loading class [org.gwtwidgets.server.spring.GWTHandler] for bean with
name 'org.gwtwidgets.server.spring.GWTHandler#0' defined in
ServletContext resource [/WEB-INF/spring-dispatcher-servlet.xml]:
problem with class file or dependent class; nested exception is
java.lang.UnsupportedClassVersionError: Bad version number in .class
file

The problem exhibits on a test server, which is running Java 1.5
(1.5.0_13) under Mac OS X Server. On my developer machine (running
Java 1.6), I do not have this problem. I suspect that gwt-sl 1.0 might
not have been properly compiled for Java 1.5, and in reality requires
Java 1.6 because of this.

[George Georgovassilis]

Darn, I knew I forgot something. Athos, you are right, the binaries are
for 1.6. Should not be a problem though to recompile for 1.5. Thanks for
pointing out!