Apache Tomcat 8.5.9 和 9.0.0.M15 发布了。Tomcat 是一个小型的轻量级应用服务器，在中小型系统和并发访问用户不是很多的场合下被普遍使用，是开发和调试JSP 程序的首选。
更新日志：
Tomcat 8.5.9
Add an available flag to realms, to indicate the state, or the realm backend. Update lockout realm to only register auth failures if the realm is available. (remm)
Readability improvements for CSS used in DefaultServlet and ErrorReportValve. Patch provided by Michael Osipov. (violetagg)
Delay creating
META-INF/war-trackerfile until after the WAR has been expanded to address the case where the Tomcat process terminates during the expansion. (markt)Correctly generate URLs for resources located inside JARs that are themselves located inside a packed WAR file. (markt)
Correctly handle the
configClassattribute of a Host when embedding Tomcat. (markt)Restore egde case for embedded allowing the connector to be removed. (remm)
……
Tomcat 9.0.0.M15 (markt)
Increment version due a local build configuration error with 9.0.0.M14 that wasn't caught until after digital signing had been completed Signing requires unique names so a new tag was required. (markt)