完整错误信息：

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOTLIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESSFOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THECOPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVERCAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICTLIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING INANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THEPOSSIBILITY OF SUCH DAMAGE.

Description Resource Path Location Type

The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path add.jsp /dwz-java/WebContent/WEB-INF/jsp/management/news line 1 JSP Problem

在出现此错误的项目上单击鼠标右键》Build Path》Configure Build Path

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2017-04-21更新

到了加入Server Library步骤时，里面是空选项，没有Tomcat 7.0选择，怎么办？

參考：eclipse server配置之加入 Tomcat server

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