IntelliJ IDEA中Maven插件无法更新索引之解决办法
Maven的仓库、索引中央仓库：目前来说， 是真正的Maven中央仓库的地址，该地址内置在Maven的源码中，其它地址包括著名的，都是镜像。
索引：中央仓库带有索引文件以方便用户对其进行搜索，完整的索引文件至日大小约为1.11G，索引每周更新一次。
本地仓库：是建立在本地机器上的Maven仓库，本地仓库是中央仓库（或者说远程仓库）的一个缓冲和子集，当你构建Maven项目的时候，首先会从本地仓库查找资源，如果没有，那么Maven会从远程仓库下载到你本地仓库。这样在你下次使用的时候就不需要从远程下载了。如果你所需要的Jar包版本在本地仓库没有，而且也不存在于远程仓库，Maven在构建的时候会报错，这种情况可能发生在有些Jar包的新版本没有在Maven仓库中及时更新。Maven缺省的本地仓库地址为${user.home}/.m2/repository。也就是说，一个用户会对应的拥有一个本地仓库。当然你可以通过修改${user.home}/.m2/settings.xml配置这个地址：12345&settings&
&localRepository& D:/java/repository&/localRepository&
...&/settings&
提交内容：只要你的项目是开源的，而且你能提供完备的POM等信息，你就可以提交项目文件至中央仓库，这可以通过Sonatype提供的实现。
IntelliJ IDEA利用索引实现自动补全众所周知，由于伟大的中国防火墙，所以在使用IDEA下载Maven仓库索引的时候，要么无法访问，要么就是速度极慢，这对开发人员带来了极大的不便，所以一般公司都用Nexus搭建一个公司内部的私服。同时利用私服更有利于对公司内部开发人员依赖的Jar包版本进行控制。
也许你会问，中央仓库带有索引，为什么本地的IDEA也需要下载索引呢？那么直接看下图你就明白了，如果本地没有下载索引的话，在pom.xml文件中添加依赖是得不到任何提示的。
IntelliJ IDEA中Maven插件配置IntelliJ已经内置了对Maven插件的支持，当然你也可以配置自己的Maven，只需要进入Settings-&Maven-&Maven home directory|User settings file|Local repository配置即可。注意如果使用自己配置的Maven，那么一定要勾选Override，否则配置不生效。
IntelliJ14.1更新索引失败原因在使用14.1.X版本的IntelliJ时，更新Maven索引出现如下错误，根据该链接内所述原因为：这是IntelliJ14.1.X版本中的一个BUG，并且会在下一个发布版本中进行修复，推荐将IntelliJ升级到版本15。
使用国内Maven仓库的镜像鉴于伟大的防火墙，所以推荐使用国内的镜像资源作为Maven中央仓库。推荐使用，配置很简单就不详述了，有两种方式，其一打开settings.xml文件，加入12345678&mirrors&
&id&nexus-osc&/id&
&mirrorOf&*&/mirrorOf&&!--用一个简单的*号会把所有的仓库地址屏蔽掉--&
&name&Nexus osc&/name&
&url&http://maven.oschina.net/content/groups/public/&/url&
&/mirror&&/mirrors&
当然还有第二种方式，就是屏蔽指定的中央仓库，并且还可以加入OSChina的第三方镜像仓库或者多个仓库，配置如下1234567891011121314&mirrors&
&id&nexus-osc&/id&
&mirrorOf&central&/mirrorOf&&!--这里指定只屏蔽central仓库--&
&name&Nexus osc&/name&
&url&http://maven.oschina.net/content/groups/public/&/url&
&id&nexus-osc-thirdparty&/id&
&mirrorOf&thirdparty&/mirrorOf&
&name&Nexus osc thirdparty&/name&
&url&http://maven.oschina.net/content/repositories/thirdparty/&/url&
&/mirror&&/mirrors&
最后，在执行Maven命令的时候，Maven还需要安装一些插件包，这些插件包的下载地址也让其指向OSChina的Maven地址。修改如下所示1234567891011121314151617181920212223242526272829303132&profile&
&id&jdk-1.8&/id&
&activation&
&jdk&1.8&/jdk&&!--指定JDK版本是1.8时自动激活--&
&/activation&
&repositories&
&repository&
&id&nexus&/id&
&name&local private nexus&/name&
&url&http://maven.oschina.net/content/groups/public/&/url&
&releases&
&enabled&true&/enabled&
&/releases&
&snapshots&
&enabled&false&/enabled&
&/snapshots&
&/repository&
&/repositories&
&pluginRepositories&
&pluginRepository&
&id&nexus&/id&
&name&local private nexus&/name&
&url&http://maven.oschina.net/content/groups/public/&/url&
&releases&
&enabled&true&/enabled&
&/releases&
&snapshots&
&enabled&false&/enabled&
&/snapshots&
&/pluginRepository&
&/pluginRepositories&&/profile&
另外你也可以下载开源中国提供的官方纯净版文件。
下载Maven仓库的索引在配置完成之后就可以下载仓库索引了，注意这是一个非常耗时的过程，建议利用晚上或者出去午饭时间下载。下载过程及下载完成之后状态如下图所示。本次下载整体耗时在一个小时左右。另外我在思考既然下载一次这么麻烦，那么下载下来的索引存放在哪里呢？我能否将其拷贝到其他机器重复利用呢？于是经过一番搜索我发现了索引的存放位置，并且将其打包拷贝到其他机器的同样位置，但未做测试，不知能否重复利用，如有网友测试完毕，可以告诉我，感谢之。
利用本地Tomcat作为索引下载服务器首先下载如下两个文件：
启动一个Apache Tomcat服务器，在其根目录下建立一个/maven2/.index的虚拟目录（注意：如果你使用的是Windows系统，可能无法建立.index件夹，必须使用DOS命令：mkdir .index），把上述两个文件拷贝至该虚拟目录下
编辑C:/WINDOWS/system32/drivers/etc/hosts文件，在文件中加入:127.0.0.1
repo1.maven.org注意：127.0.0.1为步骤2的Apache Tomcat服务器IP地址。
在IDEA的maven插件中更新索引
移除步骤3中在hosts文件中添加的内容
备注：其实该解决办法的总体思路就是先将索引文件整体下载，然后利用本地的Tomcat作为服务器，再从Tomcat上更新索引。
最后如果你想自己配置一个私服，可以参考。
开源中国镜像存在的问题开源中国镜像不是很稳定，有时候很快下载完成有时候一直处于Resolving dependencies of ...状态而无法下载
在配置了开源中国第三方库镜像之后，发现一个问题，该库内容更新不及时，很多第三方库中的Jar包版本都非常陈旧。
开源中国的中央仓库与第三方库中存在很多交叉的情况，也就是说中央仓库包括了第三方库中的内容，而且在下载jar文件的时候，默认就是直接从开源中国的中央仓库镜像下载，而不是开源中国的第三方仓库镜像下载。
我给出的建议是，如无必要，移除开源中国的第三方库镜像地址，移除的内容如下
123456&mirror&
&id&nexus-osc-thirdparty&/id&
&mirrorOf&thirdparty&/mirrorOf&
&name&Nexus osc thirdparty&/name&
&url&http://maven.oschina.net/content/repositories/thirdparty/&/url&&/mirror&
针对以上问题，有时候还是需要从国外Maven官方的仓库下载，方法是只需要修改settings.xml文件为官方默认版本即可。现将Maven默认settings.xml贴出
123456789101112131415&?xml version="1.0" encoding="UTF-8"?&&settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd"&
&localRepository&D:/apache-maven-3.3.1/repository&/localRepository&
&/pluginGroups&
&/proxies&
&/servers&
&/mirrors&
&profiles&
&/profiles&&/settings&
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IntelliJ IDEA 12.0.3 更新版发布
IntelliJ IDEA 12.0.3 更新版发布了，该版本更多还是 bug 的修复，详情请看
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