Apache Tomcat 7.0.55 发布，该版本主要是小 bug 修复和一些提升，详细列表请看 ChangeLog。
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。
Tomcat 7.0.55 (violetagg)
Catalina
fix
44312: Log an error if there is a conflict between Host and Alias names. Improve host management methods in Mapper to avoid occasionally removing a wrong host. Check that host management operations are performed on the host and not on an alias. (kkolinko)
fix
55282: Ensure that one and the same application listener is added only once when starting the web application. (violetagg)
add
56461: New failCtxIfServletStartFails attribute on Context and Host configuration to force the context startup to fail if a load-on-startup servlet fails its startup. (slaurent)
add
56526: Improved the StuckThreadDetectionValve to optionally interrupt stuck threads to attempt to unblock them. (slaurent)
fix
56545: Pre-load an additional class, the loading of which may otherwise be triggered by a web application which in turn would trigger an exception when running under a security manager. (kkolinko)
fix
56578: Correct regression in the fix for 56339 that prevented sessions from expiring when using clustering. (markt)
code
56588: Update deprecation of Context.addApplicationListener() methods according to changes in Tomcat 8. (kkolinko)
fix
56600: In WebdavServlet: Do not waste time generating response for broken PROPFIND request. (kkolinko)
fix
Provide a better error message when asynchronous operations are not supported by a filter or servlet. Patch provided by Romain Manni-Bucau. (violetagg)
fix
56606: User entries in tomcat-users.xml file are recommended to use "username" attribute rather than legacy "name" attribute. Fix inconsistencies in Windows installer, examples. Update digester rules and documentation for MemoryRealm. (markt/kkolinko)
code
56611: Refactor code to remove inefficient calls to Method.isAnnotationPresent(). Based on a patch by Jian Mou. (markt/kkolinko)
fix
56653: Fix concurrency issue with lists of contexts in Mapper when stopping Contexts. (kkolinko)
fix
56657: When using parallel deployment, if the same session id matches different versions of a web application, prefer the latest version. Ensure that remapping selects the version that we expect. (kkolinko)
fix
Assert that mapping result object is empty before performing mapping work in Mapper. (kkolinko)
fix
56658: Avoid delay between registrations of mappings for context and for its servlets. (kkolinko)
fix
56665: Correct the generation of the effective web.xml when elements contain an empty string as value. (violetagg)
fix
56666: When clearing the SSO cookie use the same values for domain, path, httpOnly and secure as were used to set the SSO cookie. (markt)
fix
56677: Ensure that HttpServletRequest.getServletContext() returns the correct value during a cross-context dispatch. (markt)
fix
56684: Ensure that Tomcat does not shut down if the socket waiting for the shutdown command experiences a SocketTimeoutException. (markt)
fix
When the current PathInfo is modified as a result of dispatching a request, ensure that a call to HttpServletRequest.getPathTranslated() returns a value that is based on the modified PathInfo. (markt)
fix
56698: When persisting idle sessions, only persist newly idle sessions. Patch provided by Felix Schumacher. (markt)
fix
56710: Do not map requests to servlets when context is being reloaded. (kkolinko)
fix
56712: Fix session idle time calculations in PersistenceManager. (kkolinko)
fix
56717: Fix duplicate registration of MapperListener during repeated starts of embedded Tomcat. (kkolinko)
add
56724: Write an error message to Tomcat logs if container background thread is aborted unexpectedly. (kkolinko)
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