Apache Tomcat is an open source software implementation of the Java Servletand JavaServer Pages technologies. Different versions of Apache Tomcat areavailable for different versions of the Servlet and JSP specifications. Themapping between the specifications and the respective Apache Tomcat versions is:
| Servlet Spec | JSP Spec | EL Spec | WebSocket Spec | Apache Tomcat version | Actual release revision | Minimum Java Version |
|---|---|---|---|---|---|---|
| 3.1 | 2.3 | 3.0 | 1.0 | 8.0.x | 8.0.0-RC5 (alpha) | 1.7 |
| 3.0 | 2.2 | 2.2 | 1.0 | 7.0.x | 7.0.47 | 1.6 (WebSocket 1.0 requires 1.7) |
| 2.5 | 2.1 | 2.1 | N/A | 6.0.x | 6.0.37 | 1.5 |
| 2.4 | 2.0 | N/A | N/A | 5.5.x (archived) | 5.5.36 (archived) | 1.4 |
| 2.3 | 1.2 | N/A | N/A | 4.1.x (archived) | 4.1.40 (archived) | 1.3 |
| 2.2 | 1.1 | N/A | N/A | 3.3.x (archived) | 3.3.2 (archived) | 1.1 |
The releases are described in more detail below to help you determinewhich one is right for you. More details about each release can be found inthe associated release notes.
Please note that although we offer downloads and documentation of olderreleases, such as Apache Tomcat 5.x, we strongly encourage users to use thelatest stable version of Apache Tomcat whenever possible. We recognize that upgradingacross major versions may not be a trivial task, and some support is stilloffered on the mailing list for users of old versions. However, because of thecommunity-driven support approach, the older your version the less people wouldbe interested or able to support you.
Almost every Tomcat release is initially released as an Alpha release. After a week orso of testing a vote is held to gather views on the stability of the release. If amajor issue is identified during testing, then the vote may not take place and therelease will remain as an Alpha release.
The download pages will always show the latest stable release and any newerAlpha or Beta release if one exists. Alpha and beta releases are always clearlymarked on the download pages.
Stability is a subjective judgement and you should always read carefully therelease notes for any version you intend to make use of. If you are an early adopterof a release, we would love to hear your opinion about its stability as part of thevote: it takes place on the development mailing list.
Alpha releases may contain large amounts of untested/missingfunctionality required by the specification and/or significant bugs and are notexpected to run stably for any length of time.
Beta releases may contain some untested functionality and/or anumber of relatively minor bugs. Beta releases are not expected to run stably.
Stable releases may contain a small number of relatively minorbugs. Stable releases are intended for production use and are expected to runstably for extended periods of time.
Apache Tomcat 8.x is the current focus of development, Itbuilds upon the improvements made in Tomcat 7.0.x and implements theServlet 3.1, JSP 2.3, EL 3.0and Web Socket 1.0 specifications. In additionto that, it includes the following improvements:
Tomcat 8 is currently in an alpha state. Regular (at least monthly) releasecandidates are being made available for testing. All the specifications arefeature complete as of 8.0.0-RC1. The remaining work includes:
ServletContainerInitializer.Apache Tomcat 7.x builds upon the improvements made inTomcat 6.0.x and implements the Servlet 3.0,JSP 2.2, EL 2.2 andWeb Socket 1.0 specifications. In additionto that, it includes the following improvements:
Apache Tomcat 6.x builds upon the improvements made inTomcat 5.5.x and implements the Servlet 2.5 andJSP 2.1 specifications. In addition to that, it includes thefollowing improvements:
Apache Tomcat 5.x is available for download from thearchives.
Apache Tomcat 5.5.x supports the same Servlet and JSPSpecification versions as Apache Tomcat 5.0.x. There are significant changesin many areas under the hood, resulting in improved performance, stability,and total cost of ownership. Please refer to the Apache Tomcat 5.5 Changelogfor details.
Apache Tomcat 5.0.x improves on Apache Tomcat 4.1 in manyways, including:
Apache Tomcat 4.x is available for download from thearchives.
Apache Tomcat 4.x implements a new servlet container (calledCatalina) that is based on completely new architecture. The 4.x releasesimplement the Servlet 2.3 and JSP 1.2specifications.
Apache Tomcat 4.1.x is a refactoringof Apache Tomcat 4.0.x, and contains significant enhancements, including:
Apache Tomcat 4.0.x. Apache Tomcat 4.0.6 is the old productionquality release. The 4.0 servletcontainer (Catalina) has been developed from the ground up for flexibility andperformance. Version 4.0 implements the final released versions of the Servlet2.3 and JSP 1.2 specifications. As required by the specifications, Apache Tomcat 4.0also supports web applications built for the Servlet 2.2 and JSP 1.1specifications with no changes.
Apache Tomcat 3.x is available for download from thearchives.
All Apache Tomcat 3.x releases trace their heritage back to theoriginal Servlet and JSP implementations that Sun donated to the ApacheSoftware Foundation. The 3.x versions all implement the Servlet2.2 and JSP 1.1 specifications.
Apache Tomcat 3.3.x. Version 3.3.2 is the current productionquality release. It continues the refactoring that was begun in version 3.2 andcarries it to its logical conclusion. Version 3.3 provides a much more modulardesign and allows the servlet container to be customized by adding and removingmodules that control the processing of servlet requests. This version alsocontains many performance improvements.
Apache Tomcat 3.2.x. Version 3.2 added few new featuressince 3.1; the major effort was a refactoring of the internals to improveperformance and stability. The 3.2.1 release, like 3.1.1, was a securitypatch. Version 3.2.2 fixed a large number of bugs and all knownspecification compliance issues. Version 3.2.3 was a security update thatcloses a serious security hole. Version 3.2.4 is a minor bug fix release.All users of Apache Tomcat versions prior to 3.2.3 should updgrade as soon aspossible. With the exception of fixes for critical security related bugs,development on the Apache Tomcat 3.2.x branch has stopped.
Apache Tomcat 3.1.x. The 3.1 release contained severalimprovements over Apache Tomcat 3.0, including servlet reloading, WAR filesupport and added connectors for the IIS and Netscape web servers. Thelatest maintenance release, 3.1.1, contained fixes for security problems.There is no active development ongoing for Apache Tomcat 3.1.x. Users of Apache Tomcat3.1 should update to 3.1.1 to close the security holes and they arestrongly encouraged to migrate to the current production release, Apache Tomcat3.3.
Apache Tomcat 3.0.x. Initial Apache Tomcat release.
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