Lighting@刘迎光

分析bug原因：

是因为某次下载jar包的时候出错，导致下文红色部分标注的jar包没有下载下来，在repository目录下，删除此jar包的文件夹，重新下载即可

我这里是junit3的jar包，但是也可能是其他jar包，这个是不确定的

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.12.4:test (default-test) on project hello: Unable to generate classpath: org.apache.maven.artifact.resolver.MultipleArtifactsNotFoundException: Missing: 
[ERROR] ---------- 
[ERROR] 1) org.apache.maven.surefire:surefire-junit3:jar:2.12.4 
[ERROR] 
[ERROR] Try downloading the file manually from the project website. 
[ERROR] 
[ERROR] Then, install it using the command: 
[ERROR] mvn install:install-file -DgroupId=org.apache.maven.surefire -DartifactId=surefire-junit3 -Dversion=2.12.4 -Dpackaging=jar -Dfile=/path/to/file 
[ERROR] 
[ERROR] Alternatively, if you host your own repository you can deploy the file there: 
[ERROR] mvn deploy:deploy-file -DgroupId=org.apache.maven.surefire -DartifactId=surefire-junit3 -Dversion=2.12.4 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id] 
[ERROR] 
[ERROR] Path to dependency: 
[ERROR] 1) dummy:dummy:jar:1.0 
[ERROR] 2) org.apache.maven.surefire:surefire-junit3:jar:2.12.4 
[ERROR] 
[ERROR] ---------- 
[ERROR] 1 required artifact is missing. 
[ERROR] 
[ERROR] for artifact: 
[ERROR] dummy:dummy:jar:1.0 
[ERROR] 
[ERROR] from the specified remote repositories: 
[ERROR] nexus (http://192.168.1.140:8081/nexus/content/groups/public, releases=true, snapshots=false) 
[ERROR] -> [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/MojoExecutionException