Warning:<i><b>root project 'mlibmodel': Unable to build Scala project configuration</b>
Details: org.gradle.api.GradleException:
Cannot infer Scala class path because no repository is declared in root project 'mlibmodel'</i>
Warning:<i><b>project ':alg': Unable to build Scala project configuration</b>
Details: org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all files for configuration ':alg:compileClasspath'.
Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve org.apache.spark:spark-core_2.11:2.1.1.
Required by:
project :alg
project :alg > project :api
project :alg > project :common
project :alg > project :mllib
project :alg > project :mllib > project :sparklib
Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve org.apache.spark:spark-core_2.11:2.1.1.
Caused by: org.gradle.api.resources.ResourceException: Could not get resource 'http://repo.maven.apache.org/maven2/org/apache/spark/spark-core_2.11/2.1.1/spark-core_2.11-2.1.1.pom'.
Caused by: org.gradle.internal.resource.transport.http.HttpErrorStatusCodeException: Could not HEAD 'http://repo.maven.apache.org/maven2/org/apache/spark/spark-core_2.11/2.1.1/spark-core_2.11-2.1.1.pom'. Received status code 501 from server: HTTPS Required</i>
這個報錯設置下載org.apache.spark:spark-core_2.11:2.1.1.這個失敗，到=導致項目構建gradle失敗。
可以：1、換一個鏈接下載或者公司內部庫下載這個包
2、離線下載好了以后，導入項目里面。