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From "Caldarale, Charles R" <Chuck.Caldar...@unisys.com>
Subject RE: Tomcat and Sun/Oracle Java 7
Date Mon, 04 Feb 2013 14:55:45 GMT
> From: André Warnier [mailto:aw@ice-sa.com] 
> Subject: Re: Tomcat and Sun/Oracle Java 7

> - tomcat 6 will run fine under a Sun/Oracle Java 1.6 JVM
> - tomcat 7 will run fine under a Sun/Oracle Java 1.6 JVM
> - tomcat 6 will run fine under a Sun/Oracle Java 1.7 JVM
> - tomcat 7 will run fine under a Sun/Oracle Java 1.7 JVM
> - tomcat 6 will run fine under an OpenJDK Java 1.7 JVM
> - tomcat 7 will run fine under an OpenJDK Java 1.7 JVM

The above are correct, assuming Tomcat is built with Java 6.

> there may (or may not) be problems compiling a servlet that uses 
> JDBC under a Sun/Oracle Java 1.7 JDK, but assuming that this servlet
> does not use JDBC in any way :

If the servlet compiles cleanly under Java 7, it should be runnable under Java 7.

> - the classes of a servlet that has been compiled under a Sun/Oracle Java 1.6 
> JDK will run fine under Tomcat 6 and a Sun/Oracle Java 1.7 JVM

Yes.

> - the classes of a servlet that has been compiled under a Sun/Oracle Java 1.7 
> JDK will run fine under Tomcat 6 and a Sun/Oracle Java 1.6 JVM

No.

> - the classes of a servlet that has been compiled under a Sun/Oracle Java 1.6 
> JDK will run fine under Tomcat 6 and a OpenJDK Java 1.6 JVM

Yes.

> - the classes of a servlet that has been compiled under a Sun/Oracle Java 1.6 
> JDK will run fine under Tomcat 6 and a OpenJDK Java 1.7 JVM

Yes.

> alternatively, is it so that to run a servlet compiled under some JDK only 
> works under the corresponding JRE/JVM ?

Classes compiled under a particular major JVM version are generally not loadable under prior
versions.  Compiler options exist to change that behavior.

 - Chuck


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