我在rocket的bin文件夹内输入：./mqadmin updateTopic -n 114.116.230.219:9876 -t stock -c DefaultCluster

        提示了下面的这个错误！！

[root@localhost bin] ./mqadmin updateTopic -n 114.116.230.219:9876 -t stock -c DefaultCluster
RocketMQLog:WARN No appenders could be found for logger (io.netty.util.internal.PlatformDependent0).
RocketMQLog:WARN Please initialize the logger system properly.
org.apache.rocketmq.tools.command.SubCommandException: UpdateTopicSubCommand command failed
	at org.apache.rocketmq.tools.command.topic.UpdateTopicSubCommand.execute(UpdateTopicSubCommand.java:185)
	at org.apache.rocketmq.tools.command.MQAdminStartup.main0(MQAdminStartup.java:139)
	at org.apache.rocketmq.tools.command.MQAdminStartup.main(MQAdminStartup.java:90)
Caused by: org.apache.rocketmq.acl.common.AclException: [10015:signature-failed] unable to calculate a request signature. error=[10015:signature-failed] unable to calculate a request signature. error=Algorithm HmacSHA1 not available
	at org.apache.rocketmq.acl.common.AclSigner.signAndBase64Encode(AclSigner.java:84)
	at org.apache.rocketmq.acl.common.AclSigner.calSignature(AclSigner.java:73)
	at org.apache.rocketmq.acl.common.AclSigner.calSignature(AclSigner.java:68)
	at org.apache.rocketmq.acl.common.AclUtils.calSignature(AclUtils.java:69)
	at org.apache.rocketmq.acl.common.AclClientRPCHook.doBeforeRequest(AclClientRPCHook.java:44)
	at org.apache.rocketmq.remoting.netty.NettyRemotingAbstract.doBeforeRpcHooks(NettyRemotingAbstract.java:172)
	at org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:368)
	at org.apache.rocketmq.client.impl.MQClientAPIImpl.createTopic(MQClientAPIImpl.java:284)
	at org.apache.rocketmq.tools.admin.DefaultMQAdminExtImpl.createAndUpdateTopicConfig(DefaultMQAdminExtImpl.java:182)
	at org.apache.rocketmq.tools.admin.DefaultMQAdminExt.createAndUpdateTopicConfig(DefaultMQAdminExt.java:163)
	at org.apache.rocketmq.tools.command.topic.UpdateTopicSubCommand.execute(UpdateTopicSubCommand.java:139)
	... 2 more
Caused by: org.apache.rocketmq.acl.common.AclException: [10015:signature-failed] unable to calculate a request signature. error=Algorithm HmacSHA1 not available
	at org.apache.rocketmq.acl.common.AclSigner.sign(AclSigner.java:63)
	at org.apache.rocketmq.acl.common.AclSigner.signAndBase64Encode(AclSigner.java:79)
	... 12 more
Caused by: java.security.NoSuchAlgorithmException: Algorithm HmacSHA1 not available
	at javax.crypto.Mac.getInstance(Mac.java:181)
	at org.apache.rocketmq.acl.common.AclSigner.sign(AclSigner.java:57)
	... 13 more

        解决方法：

        进入rocket的bin文件夹：vim tools.sh

         找到，我标蓝的这一行，在后边加入你自己的java路径。

        java 路径可以通过：echo $JAVA_HOME命令查找：

         找到自己的路径后，将路径加到图中篮筐后。保存

JAVA_OPT="${JAVA_OPT} -Djava.ext.dirs=${BASE_DIR}/lib:${JAVA_HOME}/jre/lib/ext:/usr/java/jdk1.8.0_65/jre/lib/ext"

        最后：重启服务就好