话说:
各位读者盆友,晚上好!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。