Eclipse启动tomcat报错，提示三个端口被占用。
Several ports (8005, 8080, 8009) required by Tomcat v8.5 Server at localhost are already in use. The server may already be running in another process, or a system process may be using the port. To start this server you will need to stop the other process or change the port number(s).
这里提示端口8005，8080，8009被占用。
我首先把eclipse重启一下，启动还是报错，然后到tomcat的bin目录下shutdown.bat关闭一下程序，然后启动还是报错。
排除eclipse和tomcat的问题。
打开window+r输入cmd查看端口被占用情况
也没有发现端口被占用。
在tomcat文件bin目录下startup.bat可以启动。
然后重启了一下电脑，启动tomcat，问题变成了下面的提示
查看控制台有以下错误
Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ssm]]
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ssm]]
Caused by: org.apache.catalina.LifecycleException: Failed to start component [aaa@qq.com]
Caused by: org.apache.catalina.LifecycleException: Failed to initialize component [aaa@qq.com]
Caused by: java.lang.IllegalArgumentException: java.util.zip.ZipException: invalid LOC header (bad signature)
Caused by: java.util.zip.ZipException: invalid LOC header (bad signature)
A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
然后找到maven本地仓库下载的jar包，由于太多直接全部删除，然后打开Eclipse继续maven install，把所有jar下载下来
然后启动tomcat，果然报错变了，对就是变了，不是解决了，天啊。。。
java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;Ljava/lang/Throwable;)V百度说是slf4j 这个jar引起的问题，slf4j-api.和slf4j-jdk这两个jar直接删除，只使用log4j
然后重新maven clean--》maven install 启动项目发现还是没解决问题
使用的是eclipse也不存在j2ee jar包的问题，查看maven denpendences 发现pom没有写slf4j的内容但是下载了slf4j的jar
应该是隐性依赖引起的依赖冲突,然后查找是什么引起冲突，方法如右边：https://blog.csdn.net/mint6/article/details/80615633
把依赖包含slf4j的jar去掉，重新启动。
perfect！