java讀取資料庫配置檔案
阿新 • • 發佈:2019-01-31
如果報以下異常:java.lang.NullPointerException
atjava.util.Properties$LineReader.readLine(Unknown Source)
atjava.util.Properties.load(Unknown Source)
atcom.poabner.test.service.dao.BaseDao.getConn(BaseDao.java:20)
atcom.poabner.test.service.model.LoginService.checkUser(LoginService.java:31)
atcom.poabner.test.control.LoginServlet.doGet(LoginServlet.java:32)
atcom.poabner.test.control.LoginServlet.doPost(LoginServlet.java:53)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:710)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:803)
atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
atorg.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
atorg.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
atjava.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
atcom.poabner.test.service.model.LoginService.checkUser(LoginService.java:32)
atcom.poabner.test.control.LoginServlet.doGet(LoginServlet.java:32)
atcom.poabner.test.control.LoginServlet.doPost(LoginServlet.java:53)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:710)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:803)
atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
atorg.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
atorg.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
atjava.lang.Thread.run(Unknown Source)
atjava.util.Properties$LineReader.readLine(Unknown Source)
atjava.util.Properties.load(Unknown Source)
atcom.poabner.test.service.dao.BaseDao.getConn(BaseDao.java:20)
atcom.poabner.test.service.model.LoginService.checkUser(LoginService.java:31)
atcom.poabner.test.control.LoginServlet.doGet(LoginServlet.java:32)
atcom.poabner.test.control.LoginServlet.doPost(LoginServlet.java:53)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:710)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:803)
atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
atorg.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
atorg.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
atjava.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
atcom.poabner.test.service.model.LoginService.checkUser(LoginService.java:32)
atcom.poabner.test.control.LoginServlet.doGet(LoginServlet.java:32)
atcom.poabner.test.control.LoginServlet.doPost(LoginServlet.java:53)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:710)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:803)
atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
atorg.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
atorg.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
atjava.lang.Thread.run(Unknown Source)