android环境配置之后，编译时提示：The project cannot be built until build path errors are resolved 的解决方案
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问题解决:The project cannot be built until build path errors are resolved
1,看看project -- Build Automatically有没有勾上?如果没有,勾上以后,clean一下,重启eclipse
2,看看你的lib里面有没有不用的jar包,看你的.classpath文件中有没有错误的路径.
3,这是最重要的一点,有problems视图中查看有没有关于本项目的错误信息,一般都会有这样的话: The project cannot be built until build path errors are resolved 然后下面提示unbound classpath, 一般在.classpath中删除这些path就可以了
4. 安装Tomcat后,确保{tomcat_home}/common/lib文件夹下有jasper-runtime.jar、jsp-api.jar、servlet-api.jar、jndi.jar几个文件。启动Eclipse,第一次启动会有一个配置过程，选择菜单上的window/preferences，选java/classpath variables，New添加一个名为JDK_TOOLS并指向你的{jdk_home}/lib/tools.jar的环境变量。
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