步骤：
1.添加M2_HOME的环境变量
2.Preference->Java->Installed JREs->Edit 选择一个jdk
3.添加 -Dmaven.multiModuleProjectDirectory=$M2_HOME
4. 神圣的一步：Finish
Over ！！！ 小伙伴，不要太感动哦~ #^_^#
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