问题
I'm trying to get Hadoop running 'Local Mode' on my Windows machine. I've been using this guide: http://hadoop.apache.org/docs/r1.2.1/single_node_setup.html
When I run the command: bin/hadoop, I get the following error message:
Error: JAVA_HOME is incorrectly set. Please update C:...\hadoop-2.7.1\conf\hadoop-env.cmd
Inside hadoop-env.cmd, I have the line:
set JAVA_HOME=%JAVA_HOME%
When I type echo %JAVA_HOME% at the command line I get:
C:\Java\jdk1.0.8_51
Even if I change the line in hadoop-env.cmd to:
set JAVA_HOME=C:\Java\jdk1.0.8_51
I get the same error...
How could it be that my JAVA_HOME is incorrectly set?
回答1:
If your JAVA_HOME path contains spaces, you must use the Windows 8.3 Pathname
回答2:
like the other answers, your java environment path must not contain space. The solution is as follows:
- In the cmd line, charge the directory that contain the jdk (in my case C:\Program Files\Java\jdk1.8.0_73).
- execute the following line "for %I in (.) do echo %~sI" to display the short name of your installed jdk (in my case C:\PROGRA~1\Java\JDK18~1.0_7)
- in the file "hadoop-env.cmd", change the line "JAVA_HOME=%JAVA_HOME%" with "JAVA_HOME=C:\PROGRA~1\Java\JDK18~1.0_7".
- run again the file "hadoop-env.cmd" and it will work correctly.
回答3:
set JAVA_HOME=C:\Program Files\Java\jdk1.8.0_131\
Above configuration was throwing same error as yours. I updated above with below in hadoop-env.cmd which is infact SFN
set JAVA_HOME=C:\Progra~1\Java\jdk1.8.0_131\
This allowed me to change/have different java version than that of system.
回答4:
Use "%JAVA_HOME%" in conf\hadoop-env.cmd
回答5:
Try removing @ from @rem in hadoop-env.cmd and set JAVA_HOME=%JAVA_HOME%
rem The java implementation to use. Required.
set JAVA_HOME=%JAVA_HOME%
Then try running hdfs namenode -format
This solution worked for me
回答6:
if your java environment path contains space, such as "C:\Program Files\java\xxxxx" , the word 《Program Files》 contains a space, so CMD can't identificate
this is the right answer
回答7:
in hadoop-config.xml， the logic is
if not exist %JAVA_HOME%\bin\java.exe ( echo Error: JAVA_HOME is incorrectly set. echo Please update %HADOOP_HOME%\conf\hadoop-env.cmd goto :eof )
if your java environment path contains space, such as "C:\Program Files\java\xxxxx" , the word 《Program Files》 contains a space, so CMD can't identificate
SO your can change the path instead.
来源：https://stackoverflow.com/questions/31621032/hadoop-on-windows-error-java-home-is-incorrectly-set