Maven clean install / jar:jar

Question

当我尝试运行mvn clean install -U或mvn jar:jar时

它失败了：

[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>org.apache.maven.plugins:maven-jar-plugin:2.4
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/C:/Users/XXX/.m2/repository/org/apache/maven/plugins/maven-jar-plugin/2.4/maven-jar-plugin-2.4.jar
[ERROR] urls[1] = file:/C:/Users/XXX/.m2/repository/junit/junit/3.8.1/junit-3.8.1.jar
[ERROR] urls[2] = file:/C:/Users/XXX/.m2/repository/org/apache/maven/maven-archiver/2.5/maven-archiver-2.5.jar
[ERROR] urls[3] = file:/C:/Users/XXX/.m2/repository/org/apache/maven/reporting/maven-reporting-api/2.0.6/maven-reporting-api-2.0.6.jar
[ERROR] urls[4] = file:/C:/Users/XXX/.m2/repository/org/apache/maven/doxia/doxia-sink-api/1.0-alpha-7/doxia-sink-api-1.0-alpha-7.jar
[ERROR] urls[5] = file:/C:/Users/XXX/.m2/repository/commons-cli/commons-cli/1.0/commons-cli-1.0.jar
[ERROR] urls[6] = file:/C:/Users/XXX/.m2/repository/org/codehaus/plexus/plexus-interactivity-api/1.0-alpha-4/plexus-interactivity-api-1.0-alpha-4.jar
[ERROR] urls[7] = file:/C:/Users/XXX/.m2/repository/org/codehaus/plexus/plexus-interpolation/1.15/plexus-interpolation-1.15.jar
[ERROR] urls[8] = file:/C:/Users/XXX/.m2/repository/org/codehaus/plexus/plexus-archiver/2.1/plexus-archiver-2.1.jar
[ERROR] urls[9] = file:/C:/Users/XXX/.m2/repository/org/codehaus/plexus/plexus-io/2.0.2/plexus-io-2.0.2.jar
[ERROR] urls[10] = file:/C:/Users/XXX/.m2/repository/commons-lang/commons-lang/2.1/commons-lang-2.1.jar
[ERROR] urls[11] = file:/C:/Users/XXX/.m2/repository/org/codehaus/plexus/plexus-utils/3.0/plexus-utils-3.0.jar

本项目采用：mvn compiler:compile。

所有jar文件都存在。

我不明白，当它只是创建一个简单的jar文件时，怎么会失败。。。

谢谢你的任何想法。

Answer 1

我终于找到了答案，做好准备：

rd /Q /S C:UsersXXX.m2repository
mvn clean install -U
mvn package

它工作没有任何问题。。。仍然不明白为什么这个罐子被破坏了，因为它之前是由maven下载的。。。