Server Tomcat v7.0 Server at localhost was unable to start within 45 seconds...

当启动tomcat时候出现 Server Tomcat v7.0 Server at localhost was unable to start within 45 seconds. If the server requires more time, try increasing the timeout in the server editor. 的错误，那表示你的tomcat启动超时了，有时候你重新启动下就好了，但有时需要重新启动很多次，如果你不想这样的话，你只需修改下tomcat的启动 时间就行了，步骤如下：

修改 workspace\.metadata\.plugins\org.eclipse.wst.server.core\servers.xml文件。

<servers>

<server hostname="localhost" id="JBoss v5.0 at localhost" name="JBoss v5.0 at localhost" runtime-id="JBoss v5.0" server-type="org.eclipse.jst.server.generic.jboss5" server-type-id="org.eclipse.jst.server.generic.jboss5" start-timeout="1000" stop- timeout="15" timestamp="0">

<map jndiPort="1099" key="generic_server_instance_properties" port="8090" serverAddress="127.0.0.1" serverConfig="default"/>

</server>

</servers>

把 start-timeout="45" 改为 start-timeout="1000" 或者更长 重启eclipse就可以了。