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!