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From Christopher Schultz <>
Subject Re: Tomcat 5.5 JDK version compatibility
Date Thu, 08 Mar 2012 20:09:44 GMT
Hash: SHA1


On 3/8/12 2:33 PM, David Wahler wrote:
> On Thu, Mar 8, 2012 at 12:58 PM, Caldarale, Charles R 
> <> wrote:
>>> From: David Wahler [] Subject: Tomcat
>>> 5.5 JDK version compatibility
>>> Does this mean that if a web application is deployed in Tomcat
>>> 5.5, it may not use any language features that were introduced
>>> in J2SE 5.0 or later (e.g. annotations and generics), even if
>>> those features are supported by the JRE?
>> It's not the JRE that's the issue, it's the servlet spec version
>> that your webapp is claiming compliance with.  Annotations don't
>> appear there until 2.5 (if I remember correctly).  Generics will
>> likely work, because there's nothing in the servlet spec related
>> to those.
> True, neither annotations nor generics are mentioned in the
> servlet 2.4 spec, but both are supported at the language level by
> JRE/JDK 5 and up. In particular, my test case refers to 
> @javax.annotation.Resource, which is part of J2SE 6 and understood
> by dependency-injection frameworks like Spring and Guice. But as
> per Servlet 2.5, that annotation is also interpreted by Tomcat 7
> and used to inject JNDI dependencies. My expectation was that
> Tomcat's annotation processing would only happen if web.xml
> referred to version 2.5 of the spec or later.
> Hence the question: does the fact that annotations are a Java 5 
> feature automatically make a webapp that uses them non-compliant
> with servlet spec 2.4?
> (Mark seems to be assuming that I compiled my test case against
> Tomcat 7 APIs and then tried to deploy the resulting app with
> Tomcat 5.5, which isn't the case.)

Without further specifics, I would agree with you: if your webapp says
it's 2.4-spec, then no annotation processing should occur (at least by
Tomcat: Spring, etc. is free to process annotations).

- -chris
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