STS安装Drools

1. download drools (including "Drools Engine" & "Drools and jBPM tools") from official website: https://www.drools.org/download/download.html
2. install drools plugin to sts as following:
   

   Open Eclipse.
   - Open the menu "Help", menu item "Install new software..."
   - Click on the button "Add..." to add a new software site.
   - Fill in the name "drools local update site"
   - Click on the button "Local..." and select ".../binaries/org.drools.updatesite"
   - Select all the plugins. Click the buttons "Next" and "Finish".

   Sources
   -------

   The source jars are in the sources directory.

3. configure drools:
   
   
   
   
4. Notes: 
   1. 　　if error occurred while drools plugin installing, you have to delete artifacts.xml in root directory of sts and do again!