Hadoop on Windows - "Error JAVA_HOME is incorrectly set."

Question

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?

Try setting JAVA_HOME environment variable at a system level not just your shell (assuming you just set it in the shell). If not then run 'Java -version' at a command prompt. — Heath Malmstrom, Jul 24 '15 at 23:37
Thanks for your response Heath. I have set it at a system level. I have a system variable JAVA_HOME=C:\Java\jdk1.0.8_51 ; and I have C:\Java\jdk1.0.8_51\bin in my PATH user variable. Typing in Java -version at the prompt returns -> "java version 1.8.0_51..." — Joseph Palermo, Jul 25 '15 at 13:00
No. Sorry, I should have included a mention of that in my previous comment. — Joseph Palermo, Jul 25 '15 at 15:50
check this to resolve your issue https://stackoverflow.com/a/70630733/6236959 — Shubham Kumar Gupta, Jan 08 '22 at 08:36

score 28 · Accepted Answer · answered Dec 05 '15 at 19:55

28

If your JAVA_HOME path contains spaces, you must use the Windows 8.3 Pathname

answered Dec 05 '15 at 19:55

Mohamed F

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is right! Thanks for saving my day. Just want to make it more detial, if you use the default setting while installing JAVA, you will have to set the JAVA_HOME to something like "C:\Progra~1\Java\jdk1.8.0_xxx". (Don't forget to replace xxx to your actual jdk update id.) – Rongxin Zhang Dec 27 '16 at 06:45
Right! I also encountered the JAVA_HOME problem. But then, I got another error message "Error: Could not find or load main Trung" – Duong Trung Nghia Jan 26 '17 at 12:14
@Duong edit set HADOOP_IDENT_STRING=%USERNAME% to HADOOP_IDENT_STRING=username(without space) in hadoop-env.cmd file – Prasad De Silva Apr 22 '18 at 20:41

score 26 · Answer 2 · answered Jul 25 '18 at 16:40

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.

score 21 · Answer 3 · answered Aug 15 '18 at 13:18

 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.

score 3 · Answer 4 · edited Nov 10 '21 at 09:21

3

Try to place the java path in double-coats. Example:

JAVA_HOME="C:\Program Files\Java\jdk-12.0.1"

It should work fine.

edited Nov 10 '21 at 09:21

RiveN

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answered Nov 10 '21 at 07:27

Arun Giri

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That's not working. `spark-shell` for example will throw error. – Hrvoje Dec 14 '21 at 10:41

nav3916872 · Answer 5 · 2015-12-31T06:45:16.697

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Use "%JAVA_HOME%" in conf\hadoop-env.cmd

edited Dec 31 '15 at 06:45

answered Dec 31 '15 at 06:38

nav3916872

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score 1 · Answer 6 · answered Aug 07 '17 at 16:13

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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

answered Aug 07 '17 at 16:13

PeaSir

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score 1 · Answer 7 · answered Nov 26 '18 at 05:52

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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

answered Nov 26 '18 at 05:52

Sree Ram Iyer

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score 0 · Answer 8 · answered Jun 20 '23 at 12:06

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In hadoop-env.cmd I changed %JAVA_HOME% to "C:\Program Files\openjdk-17_windows-x64_bin\jdk-17" with double quotation. It worked for me

set JAVA_HOME="C:\Program Files\openjdk-17_windows-x64_bin\jdk-17"

answered Jun 20 '23 at 12:06

benjiDev

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score -2 · Answer 9 · answered Aug 25 '16 at 09:17

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.

Hadoop on Windows - "Error JAVA_HOME is incorrectly set."

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