Hadoop:«ERROR: JAVA_HOME未设置»

I'm trying to install Hadoop on Ubuntu 11.10. I set the JAVA_HOME variable in the file conf/hadoop-env.sh to:

我正在尝试在Ubuntu 11.10上安装Hadoop。我在文件conf/hadoop-env中设置了JAVA_HOME变量。承宪:

# export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

and then I execute these commands (Standalone Operation):

然后执行这些命令(独立操作):

$ mkdir input 
$ cp conf/*.xml input 
$ bin/hadoop jar hadoop-examples-*.jar grep input output 'dfs[a-z.]+' 
$ cat output/*

but I have the following error when executing the third command:

但是在执行第三个命令时，我有以下错误:

ERROR : JAVA_HOME is not set

错误:没有设置JAVA_HOME

Is the JAVA_HOME variable not set correctly?

JAVA_HOME变量没有正确设置吗?

7 个解决方案

#1

Make sure that you have removed the comment tag and changed your JAVA_HOME in the hadoop-env.sh as well as the appropriate .bashrc and/or .profile:

确保您已经删除了注释标记并更改了hadoop-env中的JAVA_HOME。以及适当的。bashrc和/或.profile:

# export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

should be

应该是

export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

You can set your JAVA_HOME and PATH for all users (make sure you haven't previously set this to the wrong path) in /etc/profile.

您可以在/etc/ profilefile中为所有用户设置JAVA_HOME和路径(请确保之前没有将其设置为错误的路径)。

Also, don't forget to activate the new change by logging-out/in or by executing source /etc/profile.

另外，不要忘记通过登录/进入或执行源/etc/ profilefile来激活新的更改。

#2

You should set JAVA_HOME in the hadoop-env.sh file also which is in the Hadoop configuration directory. By default the JAVA_HOME setting line is commented.

您应该在hadoop-env中设置JAVA_HOME。文件也在Hadoop配置目录中。默认情况下，将注释JAVA_HOME设置行。

#3

Type echo $JAVA_HOME in your terminal to be sure your JAVA_HOME is set.

在终端中键入echo $JAVA_HOME以确保您的JAVA_HOME已设置。

You can also type java -version to know what version of java you are actually using.

您还可以输入java -version来了解实际使用的java版本。

By the way, reading your description it seems your actually writing

顺便说一下，阅读你的描述，你似乎真的在写

export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

in the file conf/hadoop-env.sh, you should write it in your terminal or in ~/.bashrc or ~/.profile then type source < path to modified file >.

在文件conf / hadoop-env。sh，你应该把它写在你的终端或~/。bashrc或(~ /。然后输入源文件 <路径到修改后的文件> 。

#4

You can add in your .bashrc file:

您可以在.bashrc文件中添加:

export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::")

and it will dynamically change when you update your packages.

当你更新你的包时，它会动态变化。

#5

Copy this export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk to hadoop-env.sh file.

将这个导出JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk复制到hadoop-env。sh文件。

JAVA_HOME is the location where java binaries are present.

JAVA_HOME是存在java二进制文件的位置。

#6

I tried the above solutions but the following worked on me

我尝试了以上的解决方案，但是下面的方法对我起了作用

export JAVA_HOME=/usr/java/default

#7

-7

hadoop ERROR : JAVA_HOME is not set
hadoop错误:没有设置JAVA_HOME

Above error is because of the space in between two words.

上面的错误是由于两个单词之间的空格。

Eg: Java located in C:\Program Files\Java --> Space in between Program and files would cause the above problem. If you remove the space, it would not show any error.

如:Java位于C:\Program Files\Java - - >程序和文件之间的空间会导致上述问题。如果您删除空格，它将不会显示任何错误。

#1