“錯誤：未正確定義JAVA_HOME。” 在mvn命令上

Question

當我運行命令時

mvn版本

在Ubuntu中，我得到以下錯誤。

錯誤：未正確定義JAVA_HOME。 我們無法執行/ usr / lib / jvm / java-7-openjdk-amd64 / bin / java

我的java版本是

Java版本“ 1.8.0_91” Java™SE運行時環境（內部版本1.8.0_91-b14）Java HotSpot（TM）64位服務器VM（內部版本25.91-b14，混合模式）

然后我跑

須藤nano / etc / environment

命令並將java home和maven設置為

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

我的路徑變量是-

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

並運行命令

須藤納米〜/ .bashrc

並在最后設置這些

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

我已經安裝了Java 8並刪除了Java 7，然后運行mvn命令，但出現此錯誤。 我很想知道為什么它顯示的是Java 7而不是Java 8，還請提出一些解決方案。 提前致謝

編輯

我的bashrc是-

    # ~/.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

Answer 1

我認為您的JAVA_HOME應該是JDK而不是JRE，因為Maven會編譯Java代碼，並且JRE中沒有Java編譯器（javac）。

Answer 2

以下內容就足夠了：

JAVA_HOME = / usr / lib / jvm / java-8-oracle

M2_HOME = / usr / local / apache-maven / apache-maven-3.2.5

PATH = $ PATH：$ JAVA_HOME / bin

PATH = $ PATH：$ M2_HOME / bin

刪除其他已聲明的M2或MAVEN_HOME變量。