无法下载jar包

[hailiang-wang]

在Mac上，执行mvn install 遇到如下错误

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building sample 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: https://nexus.chatopera.com/repository/maven-public/com/chatopera/bot/sdk/1.0.1/sdk-1.0.1.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.024 s
[INFO] Finished at: 2018-11-06T18:15:08+08:00
[INFO] Final Memory: 10M/165M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project sample: Could not resolve dependencies for project com.chatopera.bot:sample:jar:1.0-SNAPSHOT: Failed to collect dependencies at com.chatopera.bot:sdk:jar:1.0.1: Failed to read artifact descriptor for com.chatopera.bot:sdk:jar:1.0.1: Could not transfer artifact com.chatopera.bot:sdk:pom:1.0.1 from/to public (https://nexus.chatopera.com/repository/maven-public): sun.security.validator.ValidatorException: PKIX path building failed:
 sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

解决办法

1. 安装最新的Java SDK
   下载地址

2. 查看Java 安装路径
   Mac上的路径为

/Library/Java/JavaVirtualMachines/jdk_xxx.jdk/Contents/Home

xxx为该虚拟机版本，比如目前最新版本为

/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home

3. 设置JAVA_HOME

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home
export PATH=$PATH:$JAVA_HOME/bin

4. 测试Java版本

java -version
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

5. 执行mvn install

下载成功