The tag handler class for "c:forEach" ，org.apache.taglibs.standard.tag.rt.core.ForEachTag was not found on the Java Build Path

The type org.apache.commons.cli.Options cannot be resolved. It is indirectly referenced from required .class files

在搭建好HadoopEclipse开发环境后，编写map-reduce，遇到如下的问题：从字面上可以看出，工程缺少org.apache.commons.cli.Options，这个包被间接的被其他包使用，根据经验推断，这个应该是缺少$HAD…