错误原因：
编译下载最新的maven源代码，但是出现错误。错误如下：
[WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-client-core:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-client-common:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-client-shuffle:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-client-app:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-client-jobclient:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-client-hs:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-client-hs-plugins:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-client:pom:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce-examples:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-mapreduce:pom:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-streaming:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-distcp:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-archives:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-rumen:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-gridmix:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-datajoin:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-tools-dist:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-extras:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-pipes:pom:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-tools:pom:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-dist:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-client:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-minicluster:jar:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ org.apache.hadoop:hadoop-main:3.0.0-SNAPSHOT, E:hadoo p-common-trunkpom.xml, line 278, column 15 [WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.hadoop:hadoop-main:pom:3.0.0-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-enfo rcer-plugin is missing. @ line 278, column 15 [WARNING] [WARNING] It is highly recommended to fix these problems because they threaten t he stability of your build. [WARNING] [WARNING] For this reason, future Maven versions might no longer support buildin g such malformed projects. [WARNING] [INFO] ------------------------------------------------------------------------ [INFO] Reactor Build Order: [INFO] [INFO] Apache Hadoop Main [INFO] Apache Hadoop Project POM [INFO] Apache Hadoop Annotations [INFO] Apache Hadoop Project Dist POM [INFO] Apache Hadoop Assemblies [INFO] Apache Hadoop Maven Plugins [INFO] Apache Hadoop MiniKDC [INFO] Apache Hadoop Auth [INFO] Apache Hadoop Auth Examples [INFO] Apache Hadoop Common [INFO] Apache Hadoop NFS [INFO] Apache Hadoop Common Project [INFO] Apache Hadoop HDFS [INFO] Apache Hadoop HttpFS [INFO] Apache Hadoop HDFS BookKeeper Journal [INFO] Apache Hadoop HDFS-NFS [INFO] Apache Hadoop HDFS Project [INFO] hadoop-yarn [INFO] hadoop-yarn-api [INFO] hadoop-yarn-common [INFO] hadoop-yarn-server [INFO] hadoop-yarn-server-common [INFO] hadoop-yarn-server-nodemanager [INFO] hadoop-yarn-server-web-proxy [INFO] hadoop-yarn-server-resourcemanager [INFO] hadoop-yarn-server-tests [INFO] hadoop-yarn-client [INFO] hadoop-yarn-applications [INFO] hadoop-yarn-applications-distributedshell [INFO] hadoop-mapreduce-client [INFO] hadoop-mapreduce-client-core [INFO] hadoop-yarn-applications-unmanaged-am-launcher [INFO] hadoop-yarn-site [INFO] hadoop-yarn-project [INFO] hadoop-mapreduce-client-common [INFO] hadoop-mapreduce-client-shuffle [INFO] hadoop-mapreduce-client-app [INFO] hadoop-mapreduce-client-hs [INFO] hadoop-mapreduce-client-jobclient [INFO] hadoop-mapreduce-client-hs-plugins [INFO] Apache Hadoop MapReduce Examples [INFO] hadoop-mapreduce [INFO] Apache Hadoop MapReduce Streaming [INFO] Apache Hadoop Distributed Copy [INFO] Apache Hadoop Archives [INFO] Apache Hadoop Rumen [INFO] Apache Hadoop Gridmix [INFO] Apache Hadoop Data Join [INFO] Apache Hadoop Extras [INFO] Apache Hadoop Pipes [INFO] Apache Hadoop Tools Dist [INFO] Apache Hadoop Tools [INFO] Apache Hadoop Distribution [INFO] Apache Hadoop Client [INFO] Apache Hadoop Mini-Cluster [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Apache Hadoop Main 3.0.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ Downloading: http://172.21.77.119:8081/nexus/content/groups/public/org/apache/ma ven/plugins/maven-enforcer-plugin/maven-metadata.xml Downloaded: http://172.21.77.119:8081/nexus/content/groups/public/org/apache/mav en/plugins/maven-enforcer-plugin/maven-metadata.xml (714 B at 4.4 KB/sec) [INFO] [INFO] --- maven-enforcer-plugin:1.3.1:enforce (clean) @ hadoop-main --- Downloading: http://172.21.77.119:8081/nexus/content/groups/public/commons-lang/ commons-lang/2.3/commons-lang-2.3.jar [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary: [INFO] [INFO] Apache Hadoop Main ................................ FAILURE [0.531s] [INFO] Apache Hadoop Project POM ......................... SKIPPED [INFO] Apache Hadoop Annotations ......................... SKIPPED [INFO] Apache Hadoop Project Dist POM .................... SKIPPED [INFO] Apache Hadoop Assemblies .......................... SKIPPED [INFO] Apache Hadoop Maven Plugins ....................... SKIPPED [INFO] Apache Hadoop MiniKDC ............................. SKIPPED [INFO] Apache Hadoop Auth ................................ SKIPPED [INFO] Apache Hadoop Auth Examples ....................... SKIPPED [INFO] Apache Hadoop Common .............................. SKIPPED [INFO] Apache Hadoop NFS ................................. SKIPPED [INFO] Apache Hadoop Common Project ...................... SKIPPED [INFO] Apache Hadoop HDFS ................................ SKIPPED [INFO] Apache Hadoop HttpFS .............................. SKIPPED [INFO] Apache Hadoop HDFS BookKeeper Journal ............. SKIPPED [INFO] Apache Hadoop HDFS-NFS ............................ SKIPPED [INFO] Apache Hadoop HDFS Project ........................ SKIPPED [INFO] hadoop-yarn ....................................... SKIPPED [INFO] hadoop-yarn-api ................................... SKIPPED [INFO] hadoop-yarn-common ................................ SKIPPED [INFO] hadoop-yarn-server ................................ SKIPPED [INFO] hadoop-yarn-server-common ......................... SKIPPED [INFO] hadoop-yarn-server-nodemanager .................... SKIPPED [INFO] hadoop-yarn-server-web-proxy ...................... SKIPPED [INFO] hadoop-yarn-server-resourcemanager ................ SKIPPED [INFO] hadoop-yarn-server-tests .......................... SKIPPED [INFO] hadoop-yarn-client ................................ SKIPPED [INFO] hadoop-yarn-applications .......................... SKIPPED [INFO] hadoop-yarn-applications-distributedshell ......... SKIPPED [INFO] hadoop-mapreduce-client ........................... SKIPPED [INFO] hadoop-mapreduce-client-core ...................... SKIPPED [INFO] hadoop-yarn-applications-unmanaged-am-launcher .... SKIPPED [INFO] hadoop-yarn-site .................................. SKIPPED [INFO] hadoop-yarn-project ............................... SKIPPED [INFO] hadoop-mapreduce-client-common .................... SKIPPED [INFO] hadoop-mapreduce-client-shuffle ................... SKIPPED [INFO] hadoop-mapreduce-client-app ....................... SKIPPED [INFO] hadoop-mapreduce-client-hs ........................ SKIPPED [INFO] hadoop-mapreduce-client-jobclient ................. SKIPPED [INFO] hadoop-mapreduce-client-hs-plugins ................ SKIPPED [INFO] Apache Hadoop MapReduce Examples .................. SKIPPED [INFO] hadoop-mapreduce .................................. SKIPPED [INFO] Apache Hadoop MapReduce Streaming ................. SKIPPED [INFO] Apache Hadoop Distributed Copy .................... SKIPPED [INFO] Apache Hadoop Archives ............................ SKIPPED [INFO] Apache Hadoop Rumen ............................... SKIPPED [INFO] Apache Hadoop Gridmix ............................. SKIPPED [INFO] Apache Hadoop Data Join ........................... SKIPPED [INFO] Apache Hadoop Extras .............................. SKIPPED [INFO] Apache Hadoop Pipes ............................... SKIPPED [INFO] Apache Hadoop Tools Dist .......................... SKIPPED [INFO] Apache Hadoop Tools ............................... SKIPPED [INFO] Apache Hadoop Distribution ........................ SKIPPED [INFO] Apache Hadoop Client .............................. SKIPPED [INFO] Apache Hadoop Mini-Cluster ........................ SKIPPED [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1.578s [INFO] Finished at: Fri Aug 23 15:28:05 CST 2013 [INFO] Final Memory: 18M/52M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-enforcer-plugin:1. 3.1:enforce (clean) on project hadoop-main: Execution clean of goal org.apache.m aven.plugins:maven-enforcer-plugin:1.3.1:enforce failed: Plugin org.apache.maven .plugins:maven-enforcer-plugin:1.3.1 or one of its dependencies could not be res olved: Could not find artifact commons-lang:commons-lang:jar:2.3 in nexus (http: //172.21.77.119:8081/nexus/content/groups/public/) -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit ch. [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 rea d the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResoluti onException E:hadoop-common-trunk>
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-enforcer-plugin:1.
3.1:enforce (clean) on project hadoop-main: Execution clean of goal org.apache.m
aven.plugins:maven-enforcer-plugin:1.3.1:enforce failed: Plugin org.apache.maven
.plugins:maven-enforcer-plugin:1.3.1 or one of its dependencies could not be res
olved:
Could not find artifact commons-lang:commons-lang:jar:2.3 in nexus (http:
//172.21.77.119:8081/nexus/content/groups/public/) -> [Help 1]
具体错误用红色标记出来了。
解决办法
1 去自己的.m2 文件夹下把 xxx.lastUpdated文件全部删掉 （无果）
2 在用maven时加 -U参数 （无果）
3 去nexus里去先"Update Index"再"Expire Cache" （无果）
同时执行方案（2+3 ）成功。