今天第一次使用Spring Tool Suite(STS)建立spring boot專案時，專案的maven在下載jar的過程中出現問題如下。
ArtifactTransferException: Failure to transfer org.sonatype.plexus:plexus-build-api:jar:0.0.7 from https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.sonatype.plexus:plexus-build-api:jar:0.0.7 from/to central (https://repo.maven.apache.org/maven2): The operation was cancelled.
java.lang.reflect.InvocationTargetException
問題出現後專案目錄就出現一堆紅色叉叉，結構也很奇怪。
解決的辦法是在專案上按右鍵 -> Maven -> Update Project... -> 勾選[Force Update of Snapshots/Releases]（其他選項保持預設）。設定完後按確定，接著maven就會重新下載，待maven執行完後專案就正常了。
上面的動作應該同等於maven指令mvn clean install -U，-U就是強制從remote repository更新。
但pom.xml有錯誤如下。
Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.21.0 from https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.plugins:maven-surefire-plugin:pom:2.21.0 from/to central (https://repo.maven.apache.org/maven2): The operation was cancelled. pom.xml /demo line 1 Maven Configuration Problem
解決方法是在專案上按右鍵 -> Run As -> Maven clean，接著在專案上按右鍵 -> Run As -> Maven intall即解決。
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