Gradle安装遇到的坑

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话说：

各位读者盆友，晚上好！寡人小美哈。这里分享下今天遇到的一个小坑，也是花了点时间才想到解决方案。

目录

---

一、问题背景
二、解决方案
三、总结

---

环境：Mac Book Air

难度系数：★☆☆ ☆☆
建议用时：30min

一、问题背景

Mac下面安装Gradle，还不简单得跟玩似的？是的，确实很简单。下载个gradle.3.5的包，配置.bash_profile的环境变量，再集成开发环境下直接import，指定GRADLE_HOME即可。

如果一切都这么顺利就好了。
你可能只安过一遍，或者自己安过很多遍，但是你给别人安过多遍么？是的，给别人安装的时候，会遇到各种意想不到的问题。

今天小伙伴的情况是这样的：

JackChens-Macbook:bin dazhuanjia$ gradle -v

------------------------------------------------------------
Gradle 3.5
------------------------------------------------------------

Build time:   2017-04-10 13:37:25 UTC
Revision:     b762622a185d59ce0cfc9cbc6ab5dd22469e18a6

Groovy:       2.4.10
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.8.0_171 (Oracle Corporation 25.171-b11)
OS:           Mac OS X 10.13.3 x86_64

JackChens-Macbook:bin dazhuanjia$ gradle

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'bin'.
> java.io.FileNotFoundException: /Users/dazhuanjia/Downloads/gradle-3.5/lib/plugins/gradle-diagnostics-3.5.jar (No such file or directory)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 0.953 secs
JackChens-Macbook:bin dazhuanjia$

报错信息简单的小学水平都看得懂，但是我环境变量已经修改过来了：
.bash_profile

export LS_OPTIONS='--color=auto' # 如果没有指定，则自动选择颜色
export CLICOLOR='Yes' #是否输出颜色
export LSCOLORS='Exfxcxdxbxegedabagaca'
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export PATH
export CLASSPATH
GRADLE_HOME=/Applications/gradle-3.5
export GRADLE_HOME
export PATH=$PATH:$GRADLE_HOME/bin

这里很明显已经配置了，为什么每次Gradle时候还回去Downloads下面去找？

原因很简单：之前下载过一次Gradle，然后编译通过，这个时候目录是在/Users/dazhuanjia/Downloads/gradle-3.5
；我当时想替小伙伴更换一下Gradle的目录，所以直接拷贝的这个。
问题就来了，拷贝的这个,bin目录下的gradle文件已经默认记住了这个位置，所以gradle -v可以查看，但是gradle死活编译不过。

二、解决方案

1）我们先观察一下gradle-3.5/bin/gradle这个文件

寡人对比了gradle文件和本人的gradle文件(代码比对工具)，没有任何区别。所以，大体看了下引用，下面的APP_HOME=”pwd -P“可能无形中被替换了，But你感觉不到。

#!/usr/bin/env sh

##############################################################################
##
##  Gradle start up script for UN*X
##
##############################################################################

# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
    ls=`ls -ld "$PRG"`
    link=`expr "$ls" : '.*-> \(.*\)$'`
    if expr "$link" : '/.*' > /dev/null; then
        PRG="$link"
    else
        PRG=`dirname "$PRG"`"/$link"
    fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/.." >/dev/null
APP_HOME="`pwd -P`"
cd "$SAVED" >/dev/null


APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`

# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS=""

# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"

warn ( ) {
    echo "$*"
}

die ( ) {
    echo
    echo "$*"
    echo
    exit 1
}

# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "`uname`" in
  CYGWIN* )
    cygwin=true

  ;;
  Darwin* )
    darwin=true
    ;;
  MINGW* )
    msys=true
    ;;
  NONSTOP* )
    nonstop=true
    ;;
esac

CLASSPATH=$APP_HOME/lib/gradle-launcher-3.5.jar

# Determine the Java command to use to start the JVM.
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
    if [ ! -x "$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi

else
    JAVACMD="java"
    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi

# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
    MAX_FD_LIMIT=`ulimit -H -n`
    if [ $? -eq 0 ] ; then
        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
            MAX_FD="$MAX_FD_LIMIT"
        fi
        ulimit -n $MAX_FD
        if [ $? -ne 0 ] ; then
            warn "Could not set maximum file descriptor limit: $MAX_FD"
        fi
    else
        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
    fi
fi

# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi

# For Cygwin, switch paths to Windows format before running java



if $cygwin ; then
    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
    JAVACMD=`cygpath --unix "$JAVACMD"`

    # We build the pattern for arguments to be converted via cygpath
    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
    SEP=""
    for dir in $ROOTDIRSRAW ; do
        ROOTDIRS="$ROOTDIRS$SEP$dir"
        SEP="|"
    done
    OURCYGPATTERN="(^($ROOTDIRS))"
    # Add a user-defined pattern to the cygpath arguments
    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
    fi
    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    i=0
    for arg in "$@" ; do
        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option

        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
        else
            eval `echo args$i`="\"$arg\""
        fi
        i=$((i+1))
    done
    case $i in
        (0) set -- ;;
        (1) set -- "$args0" ;;
        (2) set -- "$args0" "$args1" ;;
        (3) set -- "$args0" "$args1" "$args2" ;;
        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
    esac
fi

# Escape application args
save ( ) {
    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
    echo " "
}
APP_ARGS=$(save "$@")

# Collect all arguments for the java command, following the shell quoting and substitution rules
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.launcher.GradleMain "$APP_ARGS"

# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
  cd "$(dirname "$0")"
fi

exec "$JAVACMD" "$@"

2）考虑到这个问题，Gradle这样的问题就不耽搁过多时间了，直接重新下载一个Gradle文件即可。

配置完毕，秒秒钟搞定！

三、总结

---

1、帮助别人解决问题是快乐的，同时自己也能汲取更多的经验；

2、遇到的问题越多，思考问题角度就越全面；自己是想不出或者“制造”不出这些问题的；

3、只有自己越发“博学”，才能对别人更有益处。

4、gradle如果已经编译之后，那么会默认修改bin/gradle文件，这个时候会“记忆”住这个pwd，所以更换gradle目录的时候，最好下载最新包，不要直接复制。如果复制还报错之前的路径，那就表明配置文件gradle已经修改了。

5、配置环境尽量纯净。

---

好了，再会！