Using CLASSPATH: "D:\Program Files\apache-tomcat-8.5.31\bin\bootstrap.jar;D:\Program Files\apache-tomcat-8.5.31\bin\tomcat-juli.jar"

错误: 代理抛出异常错误: java.lang.SecurityException: SHA MessageDigest not available sun.management.AgentConfigurationError: java.lang.SecurityException: SHA MessageDigest not available
   at sun.management.jmxremote.ConnectorBootstrap.startRemoteConnectorServer(ConnectorBootstrap.java:480)
   at sun.management.Agent.startAgent(Agent.java:262)
   at sun.management.Agent.startAgent(Agent.java:452)
Caused by: java.lang.SecurityException: SHA MessageDigest not available
   at sun.rmi.server.Util.computeMethodHash(Util.java:383)
   at sun.rmi.server.UnicastServerRef$HashToMethod_Maps.computeValue(UnicastServerRef.java:600)
   at sun.rmi.server.UnicastServerRef$HashToMethod_Maps.computeValue(UnicastServerRef.java:573)
   at sun.rmi.server.WeakClassHashMap.get(WeakClassHashMap.java:74)
   at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:238)
   at sun.management.jmxremote.ConnectorBootstrap$PermanentExporter.exportObject(ConnectorBootstrap.java:199)
   at javax.management.remote.rmi.RMIJRMPServerImpl.export(RMIJRMPServerImpl.java:146)
   at javax.management.remote.rmi.RMIJRMPServerImpl.export(RMIJRMPServerImpl.java:122)
   at javax.management.remote.rmi.RMIConnectorServer.start(RMIConnectorServer.java:404)
   at sun.management.jmxremote.ConnectorBootstrap.exportMBeanServer(ConnectorBootstrap.java:796)
   at sun.management.jmxremote.ConnectorBootstrap.startRemoteConnectorServer(ConnectorBootstrap.java:468)
   ... 2 more
Disconnected from server

贪吃蛇问题。蛇头坐标为小数，食物坐标也为小数。两者不对应。

j1234jj

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