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Error: JAVA_HOME is not defined correctly executing maven

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

Solution

  • 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