匯入maven專案，FIle→Import→Existing Maven Projects→找到自己想要匯入的檔案目錄→Finish。專案就匯入完成啦。接著就遇上了各種報錯！！

一、Pom.xml檔案第一次報錯

CoreException: Could not get the value for parameter compilerId for plugin execution default-testCompile: PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:3.1 or one of its dependencies could not be resolved: The following artifacts could not be resolved: org.apache.maven:maven-plugin-api:jar:2.0.9, org.apache.maven:maven-artifact:jar:2.0.9, org.apache.maven:maven-core:jar:2.0.9: Failure to transfer org.apache.maven:maven-plugin-api:jar:2.0.9 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:maven-plugin-api:jar:2.0.9 from/to central (https://repo.maven.apache.org/maven2): connect timed out。

解決方法：

這是因為網路原因，導致檔案沒有下載完成。

在電腦中搜索xxx.jar.lastUpdated，並將其都刪除即可，具體步驟如下：

1）找到 {user}/.m2/repository

2）搜尋“.lastupdated”。（如果不記得對應的.m2位置，可以全計算機搜尋）Windows將展示所有資料夾的目錄。

3）選中對應的lastupdated檔案，並刪除。

4）重新開啟（若先前未關閉，請關閉後重新開啟）Eclipse,右鍵報錯的專案，並選擇Maven > Update Project。同時記得勾選Force Update of Snapshots/Releases”. 點選OK，這樣就解決了依賴關係。

二、Pom.xml檔案再次報錯

[ERROR] No goals have been specified for this build. You must specify a valid lifecycle phase or a goal in the format:or:[:]:. Available lifecycle phases are: validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-clean, clean, post-clean, pre-site, site, post-site, site-deploy. -> [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]

解決方法：

右擊報錯的專案→Properties→Project Facets→Runtimes→勾選Apache Tomcat v7.0

在Project Facets處找不到Runtimes時，需要點選下圖Convert to faceted from…

三、Pox.xml最後報錯

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project mrpapp: Compilation failure

[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

解決方法：

在eclipse中找到Window → Preferences → Java → Installed JREs，在jRE home中修改為你安裝的jdk的目錄位置。

好了，3個報錯都被處理了，現在我就可以開心的執行專案啦！