无法找到或加载主类 com.sun.tools.javac.Main hadoop mapreduce [英] Could not find or load main class com.sun.tools.javac.Main hadoop mapreduce

查看：36 发布时间：2021/12/15 18:56:24 java hadoop mapreduce hadoop2

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我正在尝试学习 MapReduce，但我现在有点迷茫.

I am trying to learn MapReduce but I am a little lost right now.

特别是这组指令:

Compile WordCount.java and create a jar:

$ bin/hadoop com.sun.tools.javac.Main WordCount.java

当我在终端中输入 hadoop 时，我能够看到提供参数的帮助"，所以我相信我已经安装了 hadoop.

When I type in hadoop in my terminal I am able to see the "Help" made which provides arguments so I believe I have hadoop installed.

当我输入命令时:

编译 WordCount.java 并创建一个 jar:

Compile WordCount.java and create a jar:

hadoop com.sun.tools.javac.Main WordCount.java

我收到错误:

错误:无法找到或加载主类 com.sun.tools.javac.Main

我知道我已经安装了 Java 并且可以在我的计算机上运行，因为我以前使用它来创建其他程序.

I know I have Java installed and working on my computer because I've used it before to create other programs.

此命令输出:

$ /usr/libexec/java_home
/Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home

也许我缺少一组 Java 工具?不确定

Maybe I am missing a set of Java tools? Not sure

我遇到了同样的错误.

我通过添加 HADOOP_CLASSPATH 环境参数解决了这个问题:

And i solved it by add HADOOP_CLASSPATH environment parameter:

export HADOOP_CLASSPATH=/usr/lib/jvm/java-7-openjdk-amd64/lib/tools.jar

请确保您安装了 OpenJDK7.我使用的是 Ubuntu 14.04:

Please make sure that you installed OpenJDK7. I am using Ubuntu 14.04:

sudo apt-get install openjdk-7-jdk

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