问题：
Failed to execute goal on project petroleum: Could not resolve dependencies for project petroleum:petroleum:war:1.0-SNAPSHOT: Could not find artifact com.sun:tools:jar:1.5.0 at specified path C:\Program Files\Java\jre6/../lib/tools.jar -> [Help 1]
环境：
myeclipse10+ssh+maven
解决方法：
1.项目右键->Run As->Run Configrations
2.Maven Build->项目名称(可能会有多个)->JRE
