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网络相册运行不了
发表在JavaWeb图书答疑
2011-04-07
是否精华
是
否
版块置顶:
是
否
运行之后提示如下：type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
com.wy.tools.JDBConnection.executeQuery(JDBConnection.java:55)
com.wy.dao.OperationData.queryPhotoList(OperationData.java:157)
com.wy.servlet.PhotoServlet.forward_index(PhotoServlet.java:67)
com.wy.servlet.PhotoServlet.doGet(PhotoServlet.java:59)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.6 logs.
请问是什么原因，如何解决
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
com.wy.tools.JDBConnection.executeQuery(JDBConnection.java:55)
com.wy.dao.OperationData.queryPhotoList(OperationData.java:157)
com.wy.servlet.PhotoServlet.forward_index(PhotoServlet.java:67)
com.wy.servlet.PhotoServlet.doGet(PhotoServlet.java:59)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.6 logs.
请问是什么原因，如何解决
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