Apache Tomcat发布8.0.9版本，同时这个版本也是8.0的***个stable版本。Tomcat 8需要至少JDK7以上。
值得注意的更新如下：
- Support for Java Servlet 3.1, JavaServer Pages 2.3, Java Unified Expression Language 3.0 and Java WebSocket 1.0.
- The default connector implementation is now the Java non-blocking implementation (NIO) for both HTTP and AJP.
- A new resources implementation that replaces Aliases, VirtualLoader, VirtualDirContext, JAR resources and external repositories with a single, consistent approach for configuring additional web application resources. The new resources implementation can also be used to implement overlays (using a master WAR as the basis for multiple web applications that each have their own customizations).
Apache Tomcat 8.0.9 包括了 8.0.8 版本的 bug 修复和大量改进，相对于 8.0.8 版本：
- Start to move towards RFC6265 for cookie handling
- Better error handling when the error occurs after the response has been committed
- Various Jasper improvements to make it easier for other containers (e.g. Jetty) to consume
