解决Maven找不到tools

<dependency> 
            <groupId>com.sun</groupId> 
            <artifactId>tools</artifactId>
            <version>1.5.0</version> 
            <scope>system</scope> 
            <systemPath>C:\Program Files\Java\jdk1.6.0_45\lib\tools.jar</systemPath> 
        </dependency>