Error JAVA HOME is not defined correctly executing maven

Question

I installed java and set path to environment and when I execute echo  JAVA HOME 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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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  quot  JAVACMD quot      then   if   -n  quot  JAVA HOME quot       then     if   -x  quot  JAVA HOME jre sh java quot      then         IBM s JDK on AIX uses strange locations for the executables       JAVACMD  quot  JAVA HOME jre sh java quot      else       JAVACMD  quot  JAVA HOME bin java quot       fi   else     JAVACMD  quot  which java  quot    fi  fi  To if   -n  quot  JAVA HOME quot       then     if   -x  quot  JAVA HOME jre sh java quot      then         IBM s JDK on AIX uses strange locations for the executables       JAVACMD  quot  JAVA HOME jre sh java quot      else        JAVACMD  quot  JAVA HOME quot      fi   else     JAVACMD  quot  which java  quot    fi fi

User · Answer

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

User · Answer

Assuming you use bash shell and installed Java with the Oracle installer  you could add the following to your  bash profile  export JAVA HOME    usr libexec java home  export PATH  JAVA HOME jre bin  PATH   This would pick the correct JAVA HOME as defined by the Oracle installer and will set it first in your  PATH making sure it is found   Also  you don t need to change it later when updating Java   EDIT  As per the comments      Making it persistent after a reboot   Just add those lines in the shell configuration file   Assuming it s bash   Ex   bashrc   bash profile or  profile  for ubuntu      Using a custom Java installation   Set JAVA HOME to the root folder of the custom Java installation path without the       Ex  JAVA HOME  opt java openjdk

User · Answer

JAVA HOME should be  usr lib jvm java-7-oracle jre

User · Answer

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

User · Answer

Use these two commands  for Java 8    sudo update-java-alternatives --set java-8-oracle java -XshowSettings 2 gt  amp 1   grep -e  java home    awk   print  JAVA HOME   3     sed  s   jre  g   gt  gt   etc environment

User · Answer

We open a terminal and look for the location of java   manuel zonademanel     whereis java      java   usr bin java  etc java  usr bin X11 java  usr share java    usr share man man1 java 1 gz   What we are looking for is  usr bin java continue on the command line to find the absolute path   as this is only a symbolic link   manuel zonademanel     ls -lah  usr bin java      lrwxrwxrwx 1 root root 22 may 19  2015  usr bin java -     etc alternatives java   manuel zonademanel     ls -lah  etc alternatives java      lrwxrwxrwx 1 root root 39 dic  7 11 52  etc alternatives java -     usr lib jvm java-8-oracle jre bin java   I modified my  etc environment file with the following values      PATH   usr local sbin  usr local bin  usr sbin  usr bin  sbin  bin  usr games  usr local games  usr lib jvm java-8-oracle jre bin    JAVA HOME   usr lib jvm java-8-oracle jre    If I do not want to relogin I can reload the changes with   source  etc environment      And run mvn -version correctly  manuel zonademanel     mvn -version      Apache Maven 3 0 5   Maven home   usr share maven   Java version  1 8 0 77  vendor  Oracle Corporation   Java home   usr lib jvm java-8-oracle jre   Default locale  es MX  platform encoding  UTF-8   OS name   linux   version   3 16 0-70-generic   arch   amd64   family   unix

User · Answer

You might get this error due to couple of reasons  To fix this quickly please follow below steps   First find the java location  To get a list of your installed Java platforms  run the following command from the terminal     sudo update-alternatives --config java   Now set JAVA HOME and PATH     export JAVA HOME  lt java home gt     export PATH  JAVA HOME jre bin  PATH   Create the symlink    sudo ln -s  lt java home gt  jre  lt java symlink path gt    When we take your case as a example      sudo ln -s  usr lib jvm java-7-oracle jre  usr lib jvm java-7-oracle jre bin java   Above command will create the symlink location where the system is trying to find in your issue   Finally do the     mvn --version

User · Answer

set as it is export JAVA HOME  usr java jdk1 8 0 31 and run with sudo it will execute

User · Answer

You must take the whole directory where java is installed  in my case   export JAVA HOME  usr java jdk1 8 0 31

User · Answer

JAVA HOME should be the directory where java was installed  not one of its parts   export JAVA HOME  usr lib jvm java-7-oracle

[java] Error: JAVA_HOME is not defined correctly executing maven

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