專案忽然出現 The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path 解決方法
0.環境:
新裝win8.1系統,Tomcat配置無誤。
1.錯誤:
專案中某一.jps頁面忽然出現錯誤,滑鼠點上去為:The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path.
忽視錯誤,在Eclipse下啟動tomcat的時候,報錯為:Eclipse下啟動tomcat報錯:The archive: D:/Program Files/apache-tomcat-7.0.52/bin/bootstrap.jar which is referenced by the classpath, does not exist.
2.查詢原因:
原本我的Tomcat路徑為:D:\Program Files\apache-tomcat-7.0.52\,後來由於重灌系統,改為:D:\ProgramFiles\apache-tomcat-7.0.52\,在報錯中可以發現是缺少servlet-api.jar,也即tomcat路徑問題。
3.嘗試解決:
①.
1.右鍵點選專案->build path->configure build path->add library->server runtime->apache tomcat
無果,無法新增。
②.
1.開啟Eclipse中tomcat配置,就是雙擊server選項卡中的tomcat,然後選擇openlaunch configuration,如下圖所示:
2.開啟以後會出現如下介面:
3.如上圖所示,將錯誤路徑刪除,並保證正確配置tomcat-juli.jar和bootstrap.jar這兩個jar包的路徑。
無果,修改後仍啟動不了Tomcat。
③.
1.在server選項卡中刪除所有server,新建tomcat。
無果,無法新建。
④.
1.退出 eclipse
2.到[工程目錄下]/.metadata/.plugins/org.eclipse.core.runtime
3.把org.eclipse.wst.server.core.prefs和 org.eclipse.jst.server.tomcat.core.prefs這兩個檔案去掉
4.重啟eclipse
無果,沒找到org.eclipse.wst.server.core.prefs和 org.eclipse.jst.server.tomcat.core.prefs這兩個檔案。
⑤.
1.在Eclipse中,Window-->preference --> servers --> runtime --> environments --> 全部刪除
2.Add-->Browse-->選擇本地tomcat資料夾所在位置-->確定 --> finish-->OK
成功!
4.結論:
實際上是preference中路徑錯誤的問題,直接刪除掉server再重建的方法不行。
以後在移動相關資源或者依賴資源的時候會對原有的依賴它的專案產生影響。儘量將自己的IDE和相關的環境固定,少做更改,減少那些隱藏的錯誤出現的機率。
5.後續疑問:(未解)
重灌系統後Tomcat、Eclipse都是重新解壓配置的,為何Eclipse會記住重灌系統前的路徑?
轉載:http://www.cnblogs.com/issa/p/3613909.html
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