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id="Before_upgrading_or_migrating">Before upgrading or migrating</h3><div class="text"> |
| |
| <p>When updating from one major Apache Tomcat<sup>®</sup> version a newer one, please make |
| sure that the JVM that is installed on your system supports at least the |
| required Java version. While it is possible that older versions of Tomcat may |
| not be compatible with newer JVMs, all the currently supported Apache Tomcat |
| versions (9.0.x, 10.1.x and 11.0.x) are known to run correctly on Java 17 |
| JVMs.</p> |
| |
| <p>When migrating from one major Tomcat version to another (e.g. from Tomcat 9 |
| to Tomcat 10, or from Tomcat 10 to Tomcat 11), |
| you should not copy the configuration files from the old version |
| to the new version. The recommended approach is to start with the default |
| configuration of the new version of Apache Tomcat and to adjust it as necessary. |
| </p> |
| |
| <p>When migrating from one minor release to another minor release within the |
| same major release (e.g. from Tomcat 9.0.29 to Tomcat 9.0.30) you can retain the |
| configuration files, but you should check to see if any defaults have changed |
| and/or if any new elements have been added and adjust your configuration files |
| accordingly.</p> |
| </div><h3 id="Migration_Guides">Migration Guides</h3><div class="text"> |
| |
| <p>For upgrading between 11.0.x versions, see the |
| <a href="migration-11.0.html#Upgrading_11.0.x">upgrading</a> section of the Tomcat |
| 11.0.x Migration Guide.</p> |
| |
| <p>For migration from 10.1.x to 11.0.x, see the |
| <a href="migration-11.0.html">Tomcat 11.0.x Migration Guide</a>.</p> |
| |
| <p>For upgrading between 10.1.x versions, see the |
| <a href="migration-10.1.html#Upgrading_10.1.x">upgrading</a> section of the Tomcat |
| 10.1.x Migration Guide.</p> |
| |
| <p>For migration from 10.0.x to 10.1.x, see the |
| <a href="migration-10.1.html">Tomcat 10.1.x Migration Guide</a>.</p> |
| |
| <p>For upgrading between 10.0.x versions, see the |
| <a href="migration-10.html#Upgrading_10.0.x">upgrading</a> section of the Tomcat |
| 10.0.x Migration Guide.</p> |
| |
| <p>For migration from 9.0.x to 10.0.x, see the |
| <a href="migration-10.html">Tomcat 10.0.x Migration Guide</a>.</p> |
| |
| <p>For upgrading between 9.0.x versions, see the |
| <a href="migration-9.html#Upgrading_9.0.x">upgrading</a> section of the Tomcat |
| 9.0.x Migration Guide.</p> |
| |
| <p>For migration from 8.0.x / 8.5.x to 9.0.x, see the |
| <a href="migration-9.html">Tomcat 9.0.x Migration Guide</a>.</p> |
| |
| <p>For upgrading between 8.5.x versions, see the |
| <a href="migration-85.html#Upgrading_8.5.x">upgrading</a> section of the Tomcat |
| 8.5.x Migration Guide.</p> |
| |
| <p>For migration from 8.0.x to 8.5.x, see the |
| <a href="migration-85.html">Tomcat 8.5.x Migration Guide</a>.</p> |
| |
| <p>For upgrading between 8.0.x versions, see the |
| <a href="migration-8.html#Upgrading_8.0.x">upgrading</a> section of the Tomcat |
| 8.0.x Migration Guide.</p> |
| |
| <p>For migration from 7.0.x to 8.0.x, see the |
| <a href="migration-8.html">Tomcat 8.0.x Migration Guide</a>.</p> |
| |
| <p>For upgrading between 7.0.x versions, see the |
| <a href="migration-7.html#Upgrading_7.0.x">upgrading</a> section of the Tomcat |
| 7.0.x Migration Guide.</p> |
| |
| <p>For migration from 6.0.x to 7.0.x, see the |
| <a href="migration-7.html">Tomcat 7.0.x Migration Guide</a>.</p> |
| |
| <p>For upgrading between 6.0.x versions, see the |
| <a href="migration-6.html#Upgrading_6.0.x">upgrading</a> section of the Tomcat |
| 6.0.x Migration Guide.</p> |
| |
| <p>For migration from 5.5.x to 6.0.x, see the |
| <a href="migration-6.html">Tomcat 6.0.x Migration Guide</a>.</p> |
| |
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