pan3793 opened a new pull request, #3190:
URL: https://github.com/apache/incubator-kyuubi/pull/3190
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### _Why are the changes needed?_
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Travis is broken now.
```
Setting environment variables from .travis.yml
$ export SPARK_LOCAL_IP=localhost
cache.1
Setting up build cache
$ export CASHER_DIR=${TRAVIS_HOME}/.casher
0.12s$ Installing caching utilities
0.00s33.20sattempting to download cache archive
fetching
master/cache-arm64-graviton2-linux-focal-046985d2f0b3191d2c6bcfb79939b9fc8dc49dbf18bf961a8807339370ad57bf--jdk-openjdk8--scala-2.12.15.tgz
found cache
0.00s38.80sadding /home/travis/.m2 to cache
$ java -Xmx32m -version
openjdk version "11.0.8" 2020-07-14
OpenJDK Runtime Environment (build 11.0.8+10-post-Ubuntu-0ubuntu120.04)
OpenJDK 64-Bit Server VM (build 11.0.8+10-post-Ubuntu-0ubuntu120.04, mixed
mode)
$ javac -J-Xmx32m -version
javac 11.0.8
Using Scala 2.12.15
15.93s$ ./build/mvn --version
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE
exec: curl --progress-bar -L
https://archive.apache.org/dist//maven/maven-3/3.8.4/binaries/apache-maven-3.8.4-bin.tar.gz
#########################################################################
100.0%
Using `mvn` from path:
/home/travis/build/apache/incubator-kyuubi/build/apache-maven-3.8.4/bin/mvn
The JAVA_HOME environment variable is not defined correctly,
this environment variable is needed to run this program.
The command "./build/mvn --version" failed and exited with 1 during .
```
This PR proposes to use jdk_switcher to setup `JAVA_HOME`.
https://docs.travis-ci.com/user/languages/java/#switching-jdks-java-8-and-below-within-one-job
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including
negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run
test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests)
locally before make a pull request
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