週末在家給電腦換裝了固態硬盤，因爲操作失誤，把原硬盤的C盤格掉了，新系統裝在固態中，但是老系統沒了，無法新老公用。只能一條道走到黑，所有東西全部重裝。
這裏重點記錄一下Idea的安裝一級在Idea中使用Maven遇到的問題，因爲這倆問題真的是快把我逼瘋了。
Idea 2019.2的安裝
(1) 從官網下載2019.2版本，這裏不囉嗦
(2) 激活
關於激活，網上有很多方案，我也嘗試了很多，有些是能激活到2020年，有些是能激活到2099年，還有就是能永久激活。
這裏記錄下我的激活方案：
首先下載激活插件，jetbrains-agent.jar
然後講jar拷貝到idea安裝的bin目錄，修改idea.exe.vmoptions和idea64.exe.vmoptions，在最後一行添加：
-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.1\bin\jetbrains-agent.jar
(3)運行idea，激活的時候，選擇server激活，輸入：http://jetbrains-license-server
注:如果不行的話，可以嘗試輸入以下三個激活碼中任意一個，有效期是到2099年。
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Maven遇到的問題
按照各種文檔的說明和描述，都是自己安裝好maven，配置好M2_HOME，然後在idea中配置Maven的信息，如下：
這裏，我想重點是說一下幾點：
（1）不要嘗試修改Maven home directory爲你本地自己安裝的maven目錄，因爲你會遇到意想不到的問題，這裏就保持默認，它其實取的是idea的maven插件，和你自己安裝到本地的maven一樣
（2）User settings files也不要嘗試取修改，首次運行之後，會自動生成.m2目錄，你把自己maven中setting.xml文件拷貝到這裏就行了，然後Local repository會自動變成你setting.xml中設置的本地倉庫地址。
按照正常流程，一般都是修改這幾項爲自己本地maven目錄和對應的setting.xml的目錄，但是我一直會報一個很奇怪的錯誤，就是project 無法import的問題，讓查看log日誌文件，log日誌中的報錯也很奇怪，在網上幾乎沒搜到，就是什麼2 errors,然後是詳細的描述。