我想改进持续交付。我正在使用 Tomcat 8 和 maven。

我使用 mvn tomcat:redeploy 来部署 webapp。

在tomcat documentation我找到了这部分:

Deploy A New Application Archive (WAR) Remotely

If installation and startup is successful, you will receive(...)

Otherwise, the response will start with FAIL and include an error message.

作为 FAIL 的可能原因，有一点值得关注:

An exception was encountered trying to start the new web application.

所以我想在启动时抛出异常，所以在 web.xml 中我写:

<​load-on-startup>1<​/load-on-startup>

到 org.springframework.web.servlet.DispatcherServlet-Servlet。然后我写一个单例:

@Service
public class AvoidStartupOnMissingDatabase implements SmartInitializingSingleton {

    @Override
    public void afterSingletonsInstantiated() {
        throw new RuntimeException("Do not deploy this app!");
    }
}

这会导致此 Stacktrace:

java.lang.RuntimeException: Do not deploy this app!
        at xxx.AvoidStartupOnMissingDatabase.afterSingletonsInstantiated(AvoidStartupOnMissingDatabase.java:11)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:775)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
        at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:664)
        at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:630)
        at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:678)
        at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:549)
        at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:490)
        at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
        at javax.servlet.GenericServlet.init(GenericServlet.java:158)
        at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1144)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1091)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:983)
        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4962)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5274)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3823)
        at org.apache.catalina.startup.HostConfig.reload(HostConfig.java:1410)
        at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1320)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1648)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
        at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1525)
        at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:773)
        at org.apache.catalina.manager.ManagerServlet.doPut(ManagerServlet.java:443)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:664)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:613)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:486)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)

问题

不幸部署了应用程序!

问题

我初始化失败了。我说的是启动时加载。 Tomcat 不启动就说失败。 Tomcat 说(重新)部署如果可以启动。

因此异常必须使部署失败。对吧？

编辑

我测试了 tomcat-8.5.30 和 tomcat-8.5.37，不幸的是都成功了。

最佳答案

我创建了一个 bug in Tomcat .开发人员指导我找到解决方案 类似于 Alexandru Cojocaru。

我从 Servlet 转移到 SerlvetContextListener，并且成功收到部署“失败”消息。

在此无效部署之后，不幸的是，旧应用程序未重新启动。但是对 svn 的提交被成功取消，并且没有添加到 svn-change-log 中!

关于java - 优化持续部署(通过责任链取消)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54502527/