mac 上运行cassandra出现的java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: : : unknown error错误解决方法

mac 上运行cassandra出现的java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: : : unknown error错误解决方法
 
 
运行: ./bin/cassandra
得到输出结果:
objc[1881]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.
CompilerOracle: inline org/apache/cassandra/db/AbstractNativeCell.compareTo (Lorg/apache/cassandra/db/composites/Composite;)I
CompilerOracle: inline org/apache/cassandra/db/composites/AbstractSimpleCellNameType.compareUnsigned (Lorg/apache/cassandra/db/composites/Composite;Lorg/apache/cassandra/db/composites/Composite;)I
CompilerOracle: inline org/apache/cassandra/utils/ByteBufferUtil.compare (Ljava/nio/ByteBuffer;[B)I
CompilerOracle: inline org/apache/cassandra/utils/ByteBufferUtil.compare ([BLjava/nio/ByteBuffer;)I
CompilerOracle: inline org/apache/cassandra/utils/ByteBufferUtil.compareUnsigned (Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;)I
CompilerOracle: inline org/apache/cassandra/utils/FastByteOperations$UnsafeOperations.compareTo (Ljava/lang/Object;JILjava/lang/Object;JI)I
CompilerOracle: inline org/apache/cassandra/utils/FastByteOperations$UnsafeOperations.compareTo (Ljava/lang/Object;JILjava/nio/ByteBuffer;)I
CompilerOracle: inline org/apache/cassandra/utils/FastByteOperations$UnsafeOperations.compareTo (Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;)I
错误: 代理抛出异常错误: java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: : : unknown error
 
初期总以为第一个错误导致的问题:
objc[1881]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.
 
然后搜寻*, 说是mac上java7的一个漏洞,然后就更换了java8,统一了jre 和 jdk的版本到上面的1.8.0 update 25.
结果还是一样。 
 
然后,我只要把原因转移到最后的MalformedURLException上,自己查看了hosts, 发现完全正常,实在无法子,今天又到另外的一台mac上安装了相同版本的java,启动cassandra,完全正常,唯独就是我自己的mac 不行。
 
无意中发现了一个方法, 参见附录一中的URL链接:
 
使用  scutils —get HostName 命令查看当前的hostname , 尽然是空。
然后使用  scutils  —set HostName localhost   , 之后重新启动cassandra, 完全正常了。
 
 
参考:
 
 
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