Tomcat版本與Servlet、JSP等版本的支援關係
Apache Tomcat™ is an open source software implementation of the Java Servlet and JavaServer Pages technologies. Different versions of Apache Tomcat are available for different versions of the Servlet and JSP specifications. The mapping between the specifications and the respective Apache Tomcat versions is:
| Servlet Spec | JSP Spec | EL Spec | WebSocket Spec | Apache Tomcat version | Actual release revision | Support Java Versions |
|---|---|---|---|---|---|---|
| 4.0 | TBD (2.4?) | TBD (3.1?) | TBD (1.2?) | 9.0.x | None | 8 and later |
| 3.1 | 2.3 | 3.0 | 1.1 | 8.0.x | 8.0.23 | 7 and later |
| 3.0 | 2.2 | 2.2 | 1.1 | 7.0.x | 7.0.62 | 6 and later (WebSocket 1.1 requires 7 or later) |
| 2.5 | 2.1 | 2.1 | N/A | 6.0.x | 6.0.44 | 5 and later |
| 2.4 | 2.0 | N/A | N/A | 5.5.x (archived) | 5.5.36 (archived) | 1.4 and later |
| 2.3 | 1.2 | N/A | N/A | 4.1.x (archived) | 4.1.40 (archived) | 1.3 and later |
| 2.2 | 1.1 | N/A | N/A | 3.3.x (archived) | 3.3.2 (archived) | 1.1 and later |
Each version of Tomcat is supported for any stable Java release that meets the requirements of the final column in the table above.
Tomcat should also work on any Java early access build that meets the requirements of the final column in the table above. For example, users were successfully running Tomcat 8 on Java 8 many months before the first stable Java 8 release. However, users of early access builds should be aware of the following:
- It is not unusual for the initial early access builds to contain bugs that can cause problems for web applications running on Tomcat.
- If the new Java version introduces new language features then the default JSP compiler may not support them immediately. Switching the JSP compiler to javac may enable these new language features to be used in JSPs.
- If you do discover an problem using a Java early access build, please ask for help. The Tomcat user's mailing list is probably the best place to start.
The releases are described in more detail below to help you determine which one is right for you. More details about each release can be found in the associated release notes.
Please note that although we offer downloads and documentation of older releases, such as Apache Tomcat 6.x, we strongly encourage users to use the latest stable version of Apache Tomcat whenever possible. We recognize that upgrading across major versions may not be a trivial task, and some support is still offered on the mailing list for users of old versions. However, because of the community-driven support approach, the older your version the less people would be interested or able to support you.