Error java home is not defined correctly

I installed java and set the path environment and when I run echo $JAVA_HOME in the terminal I get the following output:

/usr/lib/jvm/java-7-oracle/jre/bin/java

I Also installed apache-maven and changed environment file and now it looks like this:

JAVA_HOME="/usr/lib/jvm/java-7-oracle/jre/bin/java"
M2_HOME=/usr/local/apache-maven/apache-maven-3.0.5
M2=$M2_HOME/bin
MAVEN_OPTS="-Xms256m -Xmx512m"
PATH=$M2:$PATH

But when I execute mvn --version I get a warning:

Error: JAVA_HOME is not defined correctly.
  We cannot execute /usr/lib/jvm/java-7-oracle/jre/bin/java/bin/java

Can not find out why it repeats in the end /bin/java/bin/java

JAVA_HOME should be /usr/lib/jvm/java-7-oracle/jre/.

$JAVA_HOME should be the directory where java was installed, not one of its parts:

export JAVA_HOME=/usr/lib/jvm/java-7-oracle

answered Dec 5, 2014 at 15:42

Firstly, in a development mode, you should use JDK instead of the JRE.
Secondly, the JAVA_HOME is where you install Java and where all the others frameworks will search for what they need (JRE,javac,…)

So if you set

JAVA_HOME=/usr/lib/jvm/java-7-oracle/jre/bin/java

when you run a «mvn» command, Maven will try to access to the java by adding /bin/java, thinking that the JAVA_HOME is in the root directory of Java installation.

But setting

JAVA_HOME=/usr/lib/jvm/java-7-oracle/

Maven will access add bin/java then it will work just fine.

answered Sep 18, 2015 at 19:37

This solution work for me…
just type
export PATH=$JAVA_HOME/jre/bin:$PATH in the terminal
then run mvn -version
it will show the same error but with a log like this

which: no javac in (/jre/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/puppetlabs/bin)
Warning: JAVA_HOME environment variable is not set.
Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-14T22:59:23+05:30)
Maven home: /opt/apache-maven-3.2.5
Java version: 1.8.0_171, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.10.0-693.el7.x86_64", arch: "amd64", family: "unix"

now copy the Java home path i.e. /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre in my case.

now type,

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre

and the error gets resolve.
NOTE: paste your own path which is shown by your machine in mvn log at export JAVA_HOME.

answered Jul 8, 2018 at 5:34

You must take the whole directory where java is installed, in my case:

export JAVA_HOME=/usr/java/jdk1.8.0_31

It happens because of the reason mentioned below :

If you see the mvn script: The code fails here —

Steps for debugging and fixing:

Step 1: Open the mvn script /Users/Username/apache-maven-3.0.5/bin/mvn
(Open with the less command like: less /Users/Username/apache-maven-3.0.5/bin/mvn)

Step 2: Find out the below code in the script:

  if [ -z "$JAVACMD" ] ; then
  if [ -n "$JAVA_HOME"  ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
      # IBM's JDK on AIX uses strange locations for the executables
      JAVACMD="$JAVA_HOME/jre/sh/java"
    else
      JAVACMD="$JAVA_HOME/bin/java"
    fi
  else
    JAVACMD="`which java`"
  fi
fi

if [ ! -x "$JAVACMD" ] ; then
  echo "Error: JAVA_HOME is not defined correctly."
  echo "  We cannot execute $JAVACMD"
  exit 1
fi

Step3: It is happening because JAVACMD variable was not set. So it displays the error.

Note: To Fix it

export JAVACMD=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/bin/java

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/

Key: If you want it to be permanent
open emacs .profile

post the commands
and press Ctrl-x Ctrl-c ( save-buffers-kill-terminal ).

answered Jun 15, 2017 at 9:48

If you are using mac-OS , export JAVA_HOME=/usr/libexec/java_home need to be changed to export JAVA_HOME=$(/usr/libexec/java_home) .
Steps to do this :

 $ vim .bash_profile

 export JAVA_HOME=$(/usr/libexec/java_home)

 $ source .bash_profile

where /usr/libexec/java_home is the path of your jvm

answered Jul 26, 2017 at 4:36

Use these two commands (for Java 8):

sudo update-java-alternatives --set java-8-oracle
java -XshowSettings 2>&1 | grep -e 'java.home' | awk '{print "JAVA_HOME="$3}' | sed "s//jre//g" >> /etc/environment

answered Mar 25, 2018 at 18:11

In my case, the problem was in vscode.

I use windows and installed Ubuntu on my computer, so vscode terminal uses the Ubuntu. I just go to settings.json and change to cmd.exe again

answered Aug 29, 2019 at 19:42

I had this same issue but with open jdk and none of the answers here helped. The trouble was that the mvn script was appending /bin/java at the end of JAVA home while trying to run java commands.

The solution for me was to manually edit the /usr/local/apache-maven/apache-maven-3.3.9/bin/mvn script (your own script might be installed differently; just run which mvn) and change

   if [ -z "$JAVACMD" ] ; then
  if [ -n "$JAVA_HOME"  ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
      # IBM's JDK on AIX uses strange locations for the executables
      JAVACMD="$JAVA_HOME/jre/sh/java"
    else
      JAVACMD="$JAVA_HOME/bin/java" 
    fi
  else
    JAVACMD="`which java`"
  fi
 fi

To

if [ -n "$JAVA_HOME"  ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
      # IBM's JDK on AIX uses strange locations for the executables
      JAVACMD="$JAVA_HOME/jre/sh/java"
    else 
      JAVACMD="$JAVA_HOME"
    fi
  else
    JAVACMD="`which java`"
  fi
fi

answered Oct 22, 2020 at 20:07

add in .bash_profile

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
export PATH=$JAVA_HOME/jre/bin:$PATH

and then

source .bash_profile

answered Feb 18, 2022 at 11:58

I had similar issue and it was not getting resolved even after editing and sourcing the .bash_profile, .bashrc file. I got it resolved by editing the maven.sh file directly.

export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-11.0.16.0.8-1.amzn2.0.1.x86_64
export M2_HOME=/opt/maven
export M2=/opt/maven/bin
export PATH=$PATH:$HOME/bin:$JAVA_HOME:$M2HOME:$M2

and then sourcing the file

source /etc/profile.d/maven.sh

For those who didnt get they issue resolved with other answers, give this a try as well.

answered Jan 3 at 10:35

mvn -version

# Output... 
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK, not a JRE

if [ -z "$JAVA_HOME" ] ; then
    JAVACMD=`which java`
else
    JAVACMD="$JAVA_HOME/bin/java"
fi
 
if [ ! -x "$JAVACMD" ] ; then
    echo "The JAVA_HOME environment variable is not defined correctly" >&2
    echo "This environment variable is needed to run this program" >&2
    echo "NB: JAVA_HOME should point to a JDK not a JRE" >&2
    exit 1
fi

3.1. Ошибка компиляции из-за JRE вместо JDK

Как обычно с настройками по умолчанию, они очень полезны, если у нас есть «стандартная» конфигурация.

Например, если мы устанавливаем Java 11 в системе Ubuntu 18.04 и не устанавливаем переменную средыJAVA_HOME, Maven все равно с радостью найдет наш JDK и будет использовать его для различных целей, включая компиляцию.

Но если нам удалось настроить нестандартную конфигурацию (не говоря уже о том, чтобы навести беспорядок) в нашей системе, полезности Maven уже недостаточно. Это может даже вводить в заблуждение.

Предположим, у нас есть следующая конфигурация в Ubuntu 18.04:

Если мы сделаем нашу основную проверку:

Мы получим такой значимый результат:

Apache Maven 3.6.0 (97c98ec64a1fdfee7767ce5ffb20918da4f719f3; 2018-10-24T18:41:47Z)
Maven home: /opt/apache-maven-3.6.0
Java version: 1.8.0_191, vendor: Oracle Corporation, runtime: /usr/lib/jvm/java-8-openjdk-amd64/jre
Default locale: en, platform encoding: UTF-8
OS name: "linux", version: "4.15.0-42-generic", arch: "amd64", family: "unix"

Посмотрим, что произойдет, если мы попытаемся скомпилировать проект:

Теперь мы получаем ошибку:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile (default-compile) on project my-app: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

3.2. Исправление ошибки компиляции на уровне проекта

Как и во многих других случаях с Maven, рекомендуется установить значимые общесистемные настройки — в этом случае мы изменим значение переменнойJAVA_HOME, как описано в разделе 5, чтобы указать на JDK вместо JRE.

Однако, если по какой-либо причине мы не можем установить значения по умолчанию,we can still override the settings on the project level. Посмотрим, как это сделать.

Сначала мы откроемpom.xml нашего проекта, перейдем в разделbuild / pluginManagement / plugins и посмотрим на запись дляmaven-compiler-plugin:

    maven-compiler-plugin
    3.7.0

Затем мы добавим в него конфигурацию, чтобы он использовал настраиваемый исполняемый файл, и пропустили поискjavac в каталогеJAVA_HOME/bin:

    maven-compiler-plugin
    3.7.0
    
        true
        /usr/lib/jvm/java-11-openjdk-amd64/bin/javac
    

В системах Unix этот исполняемый файл должен быть скриптом с соответствующими разрешениями. В системах Windows это должен быть файл.exe.

Далее попробуем снова скомпилировать проект:

Теперь сборка — включая фазу компиляции сmaven-compiler-plugin — прошла успешно.

4.1. ПроверкаJAVA_HOME в Linux

Просто откройте терминал и введите:

> $JAVA_HOME/bin/javac -version

ЕслиJAVA_HOME указывает на JDK, результат должен выглядеть так:

ЕслиJAVA_HOME не указывает на JDK, ОС выдает сообщение об ошибке:

> bash: /bin/javac: No such file or directory

4.2. ПроверкаJAVA_HOME в Windows

Откройте командную строку и введите:

%JAVA_HOME%binjavac -version

ЕслиJAVA_HOME указывает на JDK, результат должен выглядеть так:

ЕслиJAVA_HOME не указывает на JDK, ОС выдает сообщение об ошибке:

> The system cannot find the path specified.

• Если мы установили наш дистрибутив JDK с помощью установщика пакетов, мы сможем найти путь с помощью утилиты поиска ОС

• Если дистрибутив был переносным, давайте проверим папку, в которую мы его извлекли.

Operating System Windows 10
java version "1.8.0_161" - jre

C:Usersadmin>echo %JAVA_HOME%
C:Program FilesJavajdk1.8.0_91;

Error (Command line)
C:Usersadmin>mvn -version
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE

I had the same issue.
Please remove the backslash(») and semicolon.

For windows 10, here are the steps:

1. Open Environment Variables
2. Select ‘JAVA_HOME‘ under system variables
3. Click Edit
4. Remove the ; from path under the ‘variable name’.
5. Click ‘OK’

Done.
RUN the mvn -version command and it shall work.