在 Eclipse 中添加 M2_REPO 变量的问题
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Issue in adding M2_REPO variable in eclipse
提问by Anand
I am adding M2_REPO variable in eclipse using Window --> Preferences --> Java --> Build Path --> Classpath Variables --> New -->and then providing name as M2_REPOand selecting maven repository folder, then I see this variable getting added in the Classpath variableslist. Then I click OK button.
我在 eclipse 中使用添加 M2_REPO 变量，Window --> Preferences --> Java --> Build Path --> Classpath Variables --> New -->然后提供名称为M2_REPO并选择 maven 存储库文件夹，然后我看到这个变量被添加到类路径变量列表中。然后我点击确定按钮。
After that, if again I see the above Classpath variables, then i don't find the M2_REPOvariable there, due to which I am getting Unbound classpath variable: M2_REPO/....jarerror in my project.
之后，如果我再次看到上面的Classpath 变量，那么我在那里找不到M2_REPO变量，因此我Unbound classpath variable: M2_REPO/....jar在我的项目中遇到错误。
Can someone please help.
有人可以帮忙吗。
回答by Vishal Pahuja
Check for settings.xml in
检查 settings.xml 中的
Window --> Preferences --> Maven ---> User Settings
窗口 --> 首选项 --> Maven ---> 用户设置
If not, set it there and change localRepository path in settings tag inside settings.xml. Normally you will find settings.xml in .m2 folder under the user folder (for eg. C:\Documents and Settings\userName.m2).
如果没有，请将其设置在那里并在 settings.xml 中的设置标记中更改 localRepository 路径。通常，您会在用户文件夹下的 .m2 文件夹中找到 settings.xml（例如 C:\Documents and Settings\userName.m2）。
回答by Isaac
I think that you're doing it wrong. If you're using Eclipse (a later version, something like Juno), you shouldn't deal with the M2_REPOclasspath variable at all. You should adjust your Maven settings by going to Window -> Preferences -> Maven -> User Settings. The M2_REPOis derived from those settings and you must not override it manually.
我认为你做错了。如果您使用的是 Eclipse（更高版本，例如 Juno），则根本不应该处理M2_REPO类路径变量。您应该通过转到 Window -> Preferences -> Maven -> User Settings 来调整您的 Maven 设置。该M2_REPO从这些设置导出，你不能手动覆盖它。
回答by Fodder
My M2_REPO variable kept disappearing as well, the hint for me was here:
我的 M2_REPO 变量也一直消失，给我的提示在这里：
I'm running Spring Tool Suite 3.6.2 (which is based off Eclipse Luna).
我正在运行 Spring Tool Suite 3.6.2（基于 Eclipse Luna）。
In my workspace there's a file workspace-sts-3.6.2.RELEASE\.metadata\.plugins\org.eclipse.core.runtime\.settings\org.eclipse.jdt.core.prefs
在我的工作区中有一个文件 workspace-sts-3.6.2.RELEASE\.metadata\.plugins\org.eclipse.core.runtime\.settings\org.eclipse.jdt.core.prefs
Add the following line:
添加以下行：
org.eclipse.jdt.core.classpathVariable.M2_REPO=<your repo location>
Restart Eclipse/STS, and the M2_REPO classpath variable should be there again.
重新启动 Eclipse/STS，M2_REPO 类路径变量应该会再次出现。
Edit: It happened to me again. :'(
编辑：它又发生在我身上。:'(
The step above didn't work the second time, but doing
上面的步骤第二次没有奏效，但是做了
mvn -Declipse.workspace="(path to workspace)" eclipse:configure-workspace
added the M2_REPO variable again.
再次添加了 M2_REPO 变量。
回答by user2455862
In my case it turned out that I had a problem with maven. Paste
就我而言，结果证明我在使用 maven 时遇到了问题。粘贴
mvn --version
mvn --version
in your command line. Does it show maven version correctly? If not, then check your system variables : M2_HOME, M2. If they are not set -> set it to the correct maven directory and restart Eclipse. Everything should be fine, M2_REPO will be added automatically.
在您的命令行中。它是否正确显示了 Maven 版本？如果没有，请检查您的系统变量：M2_HOME、M2。如果未设置 -> 将其设置为正确的 maven 目录并重新启动 Eclipse。一切都应该没问题，M2_REPO 将自动添加。
If they exist and they are set to the correct maven directory, check your JAVA_HOME and PATH variables as different maven versions require different java version. If it's not correct version of java -> set it to the correct one.
如果它们存在并且它们被设置为正确的 maven 目录，请检查您的 JAVA_HOME 和 PATH 变量，因为不同的 maven 版本需要不同的 java 版本。如果它不是正确的 java 版本 -> 将其设置为正确的版本。
This solved my problem for good:).
这彻底解决了我的问题:)。
回答by Barun
Possible cause of this problem is the m2emaven plugin. If using this plugin, I would suggest to remove it and use mvn eclipse:eclipseinstead.
此问题的可能原因是m2emaven 插件。如果使用此插件，我建议将其删除并使用mvn eclipse:eclipse。
How to remove m2e, click here for help:
- Uninstall from Eclipse menu: About Eclipse -> Installation Details -> Installed Software
- Delete plugin files and folder with name
m2efrompluginfolder in eclipse installation location
- 从 Eclipse 菜单卸载：About Eclipse -> Installation Details -> Installed Software
m2e从plugineclipse安装位置的文件夹中删除插件文件和同名文件夹
回答by Leandro Souza
The direct form to resolve it:
解决它的直接形式：
mvn -Declipse.workspace="/path/to/workspace" eclipse:configure-workspace
mvn -Declipse.workspace="/path/to/workspace" eclipse:configure-workspace
Description of command in the documentation:
文档中的命令说明：
Configures The following Eclipse Workspace features
Adds the classpath variable MAVEN_REPO to Eclipse. Optionally load Eclipse code style file via a URL.
配置以下 Eclipse Workspace 功能
将类路径变量 MAVEN_REPO 添加到 Eclipse。可选择通过 URL 加载 Eclipse 代码样式文件。
-Declipse.workspace is a required parameter Directory location of the Eclipse workspace. User property is: eclipse.workspace.
-Declipse.workspace 是必需参数 Eclipse 工作区的目录位置。用户属性是：eclipse.workspace。
Ref: http://maven.apache.org/plugins/maven-eclipse-plugin/configure-workspace-mojo.html
参考：http: //maven.apache.org/plugins/maven-eclipse-plugin/configure-workspace-mojo.html
