问题描述
检查是否在 http://localhost:54321 上运行H2O实例.找不到.
Checking whether there is an H2O instance running at http://localhost:54321..... not found.
尝试启动本地H2O服务器...
Attempting to start a local H2O server...
推荐答案
假定内部版本9.0.1 + 11"表示Java 9，这就是您的问题:H2O当前仅支持Java 7或Java8.这是添加Java 9支持的票证.同时，卸载当前的Java，然后安装Java 8.
Assuming "build 9.0.1+11" means Java 9, that is your problem: H2O currently only supports Java 7 or Java 8. This is the ticket to follow for adding Java 9 support. In the meantime uninstall your current Java, then install Java 8.
更新:似乎现在支持Java 9，因此请升级到h2o 3.20或更高版本.
UPDATE: It seems Java 9 is now supported, so upgrade to h2o 3.20 or later.
顺便说一句，通常您应该提供更多信息:正在使用的语言，用来尝试启动H2O的代码(如果以这种方式启动，则使用命令行)，什么操作系统，什么版本的Java， R，Python等，内核数，内存量等.
BTW, normally you should be giving a lot more information: which language you are using, what code you used to try and start H2O (or the commandline if you started it that way), what OS, what versions of Java, R, Python, etc., number of cores, amount of memory, etc.
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