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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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-trunk\pom.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。