https://tomcat.apache.org/whichversion.html
最新最全的Tomcat 支持的Java版本对照，即兼容性一览表：
| 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 | 8.0.15 | 7 and later |
| 3.0 | 2.2 | 2.2 | 1.1 | 7.0.x | 7.0.57 | 6 and later (WebSocket 1.1 requires 7 or later) |
| 2.5 | 2.1 | 2.1 | N/A | 6.0.x | 6.0.43 | 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 |