我們配置有私服的maven中央倉庫，但是前幾天停電服務器有問題了，現在私服的中央倉庫連接不上，可是我在一個項目中需要下載jar包的時候，已經連接外網把jar下載下來了，然后我就又把地址改成私服的不能連接的中央倉庫了（工程需要，我也不知道怎么回事）,可是在又執行的時候，本地工程還要連接中央倉庫進行下載，是不是從不同倉庫下載下來的jar不能共用呢？ [INFO] Downloading: http://10.12.12.108:8081/nexus/content/groups/public/org/mybatis/generator/mybatis-generator-maven-plugin/1.3.2/mybatis-generator-maven-plugin-1.3.2.pom [WARNING] Failed to retrieve plugin descriptor for org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2: Plugin org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.mybatis.generator:mybatis-generator-maven-plugin:jar:1.3.2 [INFO] Downloading: http://10.12.12.108:8081/nexus/content/groups/public/org/apache/maven/plugins/maven-deploy-plugin/2.7/maven-deploy-plugin-2.7.pom [WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-deploy-plugin:2.7: Plugin org.apache.maven.plugins:maven-deploy-plugin:2.7 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-deploy-plugin:jar:2.7 [INFO] Downloading: http://10.12.12.108:8081/nexus/content/groups/public/org/apache/maven/plugins/maven-site-plugin/3.3/maven-site-plugin-3.3.pom [WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-site-plugin:3.3: Plugin org.apache.maven.plugins:maven-site-plugin:3.3 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-site-plugin:jar:3.3 [INFO] Downloading: http://10.12.12.108:8081/nexus/content/groups/public/org/apache/maven/plugins/maven-antrun-plugin/1.3/maven-antrun-plugin-1.3.pom [WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-antrun-plugin:1.3: Plugin org.apache.maven.plugins:maven-antrun-plugin:1.3 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-antrun-plugin:jar:1.3 [INFO] Downloading: http://10.12.12.108:8081/nexus/content/groups/public/org/apache/maven/plugins/maven-assembly-plugin/2.2-beta-5/maven-assembly-plugin-2.2-beta-5.pom [WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5: Plugin org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-assembly-plugin:jar:2.2-beta-5 [INFO] Downloading: http://10.12.12.108:8081/nexus/content/groups/public/org/apache/maven/plugins/maven-dependency-plugin/2.8/maven-dependency-plugin-2.8.pom [WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-dependency-plugin:2.8: Plugin org.apache.maven.plugins:maven-dependency-plugin:2.8 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-dependency-plugin:jar:2.8 [INFO] Downloading: http://10.12.12.108:8081/nexus/content/groups/public/org/apache/maven/plugins/maven-release-plugin/2.3.2/maven-release-plugin-2.3.2.pom [WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-release-plugin:2.3.2: Plugin org.apache.maven.plugins:maven-release-plugin:2.3.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-release-plugin:jar:2.3.2 [INFO] Downloading: http://10.12.12.108:8081/nexus/content/groups/public/org/apache/maven/plugins/maven-metadata.xml 可是如果這個工程我連接到公網的倉庫就可以運行，連接本地私服倉庫就不能運行??！ 終極問題 ： 為什么我本地倉庫已經存在這個jar包了，運行的時候，工程還要去中央倉庫下載呢？