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在docker安装tomcat的时候，报错：Caused by: java.lang.IllegalArgumentException: The AJP Connector is configured with secretRequired="true

　　初识 docker，试着在 docker 中安装 tomcat（安装的 tomcat8.5），并且挂载到宿主机的相关目录下，结果启动的时候报错：

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12-May-2020 01:14:34.061 SEVERE [main] org.apache.catalina.core.StandardService.startInternal Failed to start connector [Connector[AJP/1.3-8009]]
    org.apache.catalina.LifecycleException: Protocol handler start failed
        at org.apache.catalina.connector.Connector.startInternal(Connector.java:1085)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:440)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:766)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:688)
        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:498)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:343)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:474)
    Caused by: java.lang.IllegalArgumentException: The AJP Connector is configured with secretRequired="true" but the secret attribute is either null or "". This combination is not valid.
        at org.apache.coyote.ajp.AbstractAjpProtocol.start(AbstractAjpProtocol.java:274)
        at org.apache.catalina.connector.Connector.startInternal(Connector.java:1083)
        ... 12 more
22-May-2020 01:14:34.062 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 124 ms

　　查阅资料，发现了 8.5 版本的 tomcat 的 sever.xml 中有个属性 secretRequired 需要给设置值：

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<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

设置成 "" 就可以了，也就是下面的设置结果：

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<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" secretRequired="" />

　　然后重新启动 docer 中的 tomcat，发现启动成功了，大功告成！