老师啊，有大问题，空指针有问题，还有导入包也有问题？

严重: Servlet.service() for servlet [search] in context with path [/Test] threw exception
java.lang.NullPointerException

严重: Servlet.service() for servlet [search] in context with path [/Test] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException