maven 安装m2e 报错

Eclipse安装maven插件m2e

m2e - http://m2eclipse.sonatype.org/sites/m2e

m2e-extras - http://m2eclipse.sonatype.org/sites/m2e-extras

，报错信息如下：

1. Cannot complete the install because one or more required items could not be found.
2. Software being installed: Maven Integration for Eclipse (Required) 0.12.1.20110112-1712 (org.maven.ide.eclipse.feature.feature.group 0.12.1.20110112-1712)
3. Missing requirement: Maven Integration for Eclipse (Editors) 0.12.1.20110112-1712 (org.maven.ide.eclipse.editor 0.12.1.20110112-1712) requires 'bundle org.eclipse.zest.core 0.0.0' but it could not be found
4. Cannot satisfy dependency:
5. From: Maven Integration for Eclipse (Required) 0.12.1.20110112-1712 (org.maven.ide.eclipse.feature.feature.group 0.12.1.20110112-1712)
6. To: org.maven.ide.eclipse.editor [0.12.1.20110112-1712]

解决方案： 
Help -> Install new Software ->Available Software Sites -> choose "http://download.eclipse.org/tools/gef/updates/releases/" -> Enable it -> then install. 
Or if don't have, choose Add "http://download.eclipse.org/tools/gef/updates/releases/" -> then install.

After finish installing, restart eclipse, can install maven plugin.

----------------------------------------------------------------------

1. An error occurred while collecting items to be installed
2. session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
3. Unable to read repository at http://m2eclipse.sonatype.org/sites/m2e/0.12.1.20110112-1712/plugins/org.maven.ide.eclipse.maven_embedder_0.12.1.20110112-1712.jar.
4. Read timed out

解决方案： 
change another address: 
http://download.eclipse.org/technology/m2e/releases

引用http://smallwildpig.iteye.com/blog/1746763