HTTP/2 support added: HTTP/2 is supported for h2 (over TLS, negotiated via ALPN) and h2c (clear text, negotiated via HTTP/1.1 upgrade).This change is present starting Tomcat 8.5.0 version. Applications using Comet are recommended to migrate to WebSockets. This change is present starting Tomcat 8.5.0 version.Ĭomet support removed: Comet support has been removed without a direct replacement.
Users are recommended to switch to the Java non-blocking IO implementation (NIO). The Java blocking IO implementation (BIO) for both HTTP and AJP has been removed.
Expression Language 3.1: It is anticipated that Java EE 8 will include a maintenance release of expression language with a version of 3.1.JavaServer Pages 2.4: It is anticipated that Java EE 8 will include a maintenance release of JSP with a version of 2.4.For example, if package "a" contains class PushBuilder, the following JSP page will cease to compile in Tomcat 9: Servlet 4.0 APIs: In JSP, pages that use wildcard import syntax the new classes added in Servlet API may conflict with ones in web applications.The changes between versions of specifications may be found in the Changes appendix in each of specification documents. Specification APIs: Apache Tomcat 9 supports the Java Servlet 4.0, Java Server Pages 2.3, Java Unified Expression Language 3.0, and Java API for WebSocket 1.0 specifications.Apache Tomcat 8.0.x and 8.5.x required Java 7. Java 8 is required: Apache Tomcat 9.0.x requires Java 8 or later.Upgrading to Tomcat 9.0 from Tomcat 8.0.x or 8.5.x also comes with some known backward compatibility issues which we should be all aware of:
The decision to migrate to a new platform is never an easy decision but we all make it, keeping in mind the benefits of using current software release and also better support within the support community. Migrating From Tomcat 8.0.x or 8.5.x to Tomcat 9.0 I take this opportunity to summarize some of the new features in Tomcat 9.0 and steps to keep in mind before upgrading from Tomcat 8.x to Tomcat 9.0. Apache Tomcat version 9.0 implements the Servlet 4.0 and Java Server Pages 2.3 specifications from the Java Community Process and includes many additional features that make it a useful platform for developing and deploying web applications and web services. Apache Tomcat is a very popular and preferred industry choice for web application development as a Servlet/JSP container.
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