最近将CI改为了使用docker构建，gradle突然出现报错
Gradle build daemon disappeared unexpectedly (it may have been killed or may have crashed)
一般来说出现这样的问题，大部分是内存不足问题，但此次肯定不是，可用内存大把。
于是google之，看了几种说法，感觉都不是，在翻stackoverflow的时候发现一个相关回复：
In our case the issue was caused by the CI server passing environment variables with non-ascii characters (i.e. in the names of commit authors).
Adding file.encoding=utf-8 to Gradle properties fixed the issue immediately.
瞬时觉得就是它了，于是返回去仔细查看gradle报错信息，发现如下内容
00:52:04.181 [DEBUG] [org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment] Configuring env variables: {CI_COMMIT_MESSAGE=????????????????????????????????????, PATH=/root/workspace/jdk/bin:/root/workspace/gradle/bin:/usr/local/sbin:/usr/local/
...
----- End of the daemon log -----
果然，是commit message里存在中文信息，导致CI Server传递环境变量时不能正确识别，导致出错。
方向找到了，就好解决了，需要从两个方面入手，一是让容器里的locale变成utf-8，另一方面是让gradle支持utf-8
一、进入到gradle容器中，确认了一下gradle容器中的locale
# locale
LANG=
LANGUAGE=
LC_CTYPE="POSIX"
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=
是POSIX，不是UTF8，修改locale配置
# vi ～/.bash_profile
export LC_ALL="C.UTF-8"
export LANG="C.UTF-8"
export LANGUAGE="C.UTF-8"
二、导出修改过的容器，打tag，上传私仓
docker ps
docker export -o gradle.tar xxxxxxx
docker import gradle.tar harbor.demo.com/gradle:latest
docker push harbor.demo.com/gradle:latest
三、修改CI文件，让gradle支持utf-8
variables:
GRADLE_OPTS: "-Dfile.encoding=utf-8"
经过测试，问题解决。
参考文档：
/questions/37171043/gradle-build-daemon-disappeared-unexpectedly-it-may-have-been-killed-or-may-hav
/questions/21267234/show-utf-8-text-properly-in-gradle
