'Fehler: JAVA_HOME ist nicht korrekt definiert.', die auf Befehl mvn

wenn ich den Befehl ausführen

mvn-version

in ubuntu bekomme ich folgende Fehlermeldung.

Fehler: JAVA_HOME ist nicht richtig definiert.
Können wir nicht ausführen /usr/lib/jvm/java-7-openjdk-amd64/bin/java

Meine java-version ist

java-version "1.8.0_91" Java(TM) SE Runtime Environment (build
1.8.0_91-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

Und ich laufen

sudo nano /etc/environment

Befehl und java home setzen und maven als

JAVA_HOME="/usr/lib/jvm/java-8-oracle/jre"
M2_HOME=/usr/local/apache-maven/apache-maven-3.2.5
MAVEN_HOME=/usr/local/apache-maven/apache-maven-3.2.5
M2=/usr/local/apache-maven/apache-maven-3.2.5/bin

Und meine path-variable ist -

/usr/share/maven3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/lib/jvm/java-8-oracle/jre:/home/hduser/bin:/usr/lib/jvm/java-8-oracle/bin:/usr/local/hadoop/bin:/usr/local/hadoop/sbin:/usr/local/hadoop/bin:/usr/lib/sqoop/bin:/home/hduser/bin:/usr/lib/jvm/java-8-oracle/jre/bin

Und Befehl ausführen

sudo nano ~/.bashrc

und legen diese am Ende

JAVA_HOME=/usr/lib/jvm/java-8-oracle/jre
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin export JAVA_HOME export JRE_HOME
export PATH export M2_HOME=/usr/share/maven3 export M2=$M2_HOME/bin
export PATH=$M2:$PATH

Habe ich die Installation von java 8 und entfernen von java 7 und führen Sie dann das mvn-Kommando, und ich bin immer diese Fehlermeldung. Ich bin neugierig zu wissen, warum es zeigt java 7 statt java 8 und auch Bitte empfehlen Sie mir einige Lösung.
Vielen Dank im Voraus

BEARBEITEN

Meine bashrc ist -

    # ~/.bashrc: executed by bash(1) for non-login shells.
    # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
    # for examples

    # If not running interactively, don't do anything
    case $- in
        *i*) ;;
          *) return;;
    esac

    # don't put duplicate lines or lines starting with space in the history.
    # See bash(1) for more options
    HISTCONTROL=ignoreboth

    # append to the history file, don't overwrite it
    shopt -s histappend

    # for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
    HISTSIZE=1000

    # ~/.bashrc: executed by bash(1) for non-login shells.
    # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
    # for examples

    # If not running interactively, don't do anything
    case $- in
        *i*) ;;
          *) return;;
    esac

    # don't put duplicate lines or lines starting with space in the history.
    # See bash(1) for more options
    HISTCONTROL=ignoreboth

    # append to the history file, don't overwrite it
    shopt -s histappend

    # for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
    HISTSIZE=1000
    HISTFILESIZE=2000

    # check the window size after each command and, if necessary,
    # update the values of LINES and COLUMNS.
shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will
# match all files and zero or more directories and subdirectories.
#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)
[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "${debian_chroot:- }" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi

# set a fancy prompt (non-color, unless we know we "want" color)
case "$TERM" in
    xterm-color) color_prompt=yes;;
esac

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
#force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
        # We have color support; assume it's compliant with Ecma-48
        # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
        # a case would tend to support setf rather than setaf.)
        color_prompt=yes
    else
        color_prompt=
    fi
fi

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
else
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*)
    ;;
esac

# enable color support of ls and also add handy aliases
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    #alias dir='dir --color=auto'
    #alias vdir='vdir --color=auto'

    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'
fi

# some more ls aliases
alias ll='ls -alF'
alias la='ls -A'

alias l='ls -CF'

# Add an "alert" alias for long running commands.  Use like so:
#   sleep 10; alert
alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*al$

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then

 . /etc/bash_completion
  fi
fi
#=======================================
# Added by TKS to conexport PATH=$JAVA_HOME/bin:$PATH
figure HDFS
#=======================================
#HADOOP VARIABLES START
export HADOOP_INSTALL=/usr/local/hadoop
export PATH=$PATH:$HADOOP_INSTALL/bin
export PATH=$PATH:$HADOOP_INSTALL/sbin
export HADOOP_MAPRED_HOME=$HADOOP_INSTALL
export HADOOP_COMMON_HOME=$HADOOP_INSTALL
export HADOOP_HDFS_HOME=$HADOOP_INSTALL
export YARN_HOME=$HADOOP_INSTALL
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_INSTALL/lib/native
export HADOOP_OPTS="-Djava.library.path=$HADOOP_INSTALL/lib"
export HADOOP_HOME=/usr/local/hadoop
#export SQOOP_HOME=/usr/local/sqoop
export PATH=$PATH:$HADOOP_HOME/bin
#export PATH=$PATH:$SQOOP_HOME/bin
export SQOOP_HOME=/usr/lib/sqoop
#HADOOP VARIABLES END
JAVA_HOME=/usr/lib/jvm/java-8-oracle
PATH=$PATH:$JAVA_HOME/bin
export JAVA_HOME
export PATH
export M2_HOME=/usr/local/apache-maven/apache-maven-3.2.5
export M2=$M2_HOME/bin
export PATH=$M2:$PATH