Java项目用sqlstudio能连上，用navicat连不上，显示空指针

shengjunlintianxia 2019-01-29 07:08:02



严重: Servlet.service() for servlet [jsp] in context with path [/SMInvoicing] threw exception [java.lang.NullPointerException] with root cause

java.lang.NullPointerException

	at electric.dbs.Newsdb.selectsql(Newsdb.java:34)

	at org.apache.jsp.index_jsp._jspService(index_jsp.java:89)

	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)

	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)

	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)

	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)

	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)

	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)

	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)

	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)

	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2407)

	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2396)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

	at java.lang.Thread.run(Thread.java:745)