我是第一次使用这个工具，我无法正确构建项目。
当我尝试生命周期命令时，它通过干净的验证和编译成功构建。但是当我尝试 mvn test 时，它给了我这个错误：
[INFO] ---------------------------------------------------------------------
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[INFO] BUILD FAILURE
[INFO] ---------------------------------------------------------------------
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[INFO] Total time: 4.410 s
[INFO] Finished at: 2018-05-25T11:33:07+02:00
[INFO] ---------------------------------------------------------------------
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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-
plugin:2.20.1:test (default-test) on project gdp: Execution default-test of
goal org.apache.maven.plugins:maven-surefire-plugin:2.20.1:test failed.
:NullPointerException
-> [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 …