Apache官方对各版本的解释：http://tomcat.apache.org/whichversion.html。ApacheTomcat®是Java Servlet和Java Server Pages技术的开源软件实现。 不同版本的Apache Tomcat可用于不同版本的Servlet和JSP规范。 规范与各自的Apache Tomcat版本之间的映射是：
| Servlet Spec | JSP Spec | EL Spec | WebSocket Spec | JASPIC Spec | Apache Tomcat Version | Latest Released Version | Supported Java Versions |
| 4.0 | 2.3 | 3.0 | 1.1 | 1.1 | 9.0.x | 9.0.12 | 8 and later |
| 3.1 | 2.3 | 3.0 | 1.1 | 1.1 | 8.5.x | 8.5.34 | 7 and later |
| 3.1 | 2.3 | 3.0 | 1.1 | N/A | 8.0.x (superseded) | 8.0.53 (superseded) | 7 and later |
| 3.0 | 2.2 | 2.2 | 1.1 | N/A | 7.0.x | 7.0.91 | 6 and later (7 and later for WebSocket) |
| 2.5 | 2.1 | 2.1 | N/A | N/A | 6.0.x (archived) | 6.0.53 (archived) | 5 and later |
| 2.4 | 2.0 | N/A | N/A | N/A | 5.5.x (archived) | 5.5.36 (archived) | 1.4 and later |
| 2.3 | 1.2 | N/A | N/A | N/A | 4.1.x (archived) | 4.1.40 (archived) | 1.3 and later |
| 2.2 | 1.1 | N/A | N/A | N/A | 3.3.x (archived) | 3.3.2 (archived) | 1.1 and later |
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