tomcat8 升级至apache-tomcat-9.0.31， Connector / AJP 配置报错问题

直接贴tomcat8中的 server.xml  关键配置

同样在tomcat9 启动过程报错如下

22-Feb-2020 17:26:27.854 SEVERE [main] org.apache.catalina.util.LifecycleBase.handleSubClassException Failed to start component [Connector[AJP/1.3-6667]]
	org.apache.catalina.LifecycleException: Protocol handler start failed
		at org.apache.catalina.connector.Connector.startInternal(Connector.java:1038)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.StandardService.startInternal(StandardService.java:438)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.startup.Catalina.start(Catalina.java:633)
		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:264)
		at org.apache.catalina.connector.Connector.startInternal(Connector.java:1035)
		... 12 more

The AJP Connector is configured with secretRequired="true" but the secret attribute is either null or "". This combination is not valid.

意思就是在tomcat9中 需要配置 一个属性 secretRequired