java - JSP Page error While inserting data -

-

enter image description here

im noob programming please following code.while running code gave me nullpointer exception

you never call establishconnection in dao class. result of con null.

add method establishconnection in constructor of persondao:

public persondao(){     establishconnection(); }

and try again.

furthermore read java code conventions. class name should start uppercase: persondao correct , follows camelcase code conventions.


Comments

Post a Comment

Popular posts from this blog

java - Unable to make sub reports with Jasper -

-
i using jaspersoft studio create reports. having sub report in jasper main report. problem unable make work, because if add sub report detail band of main report, sub report generated number of times, row row, entire sub report repeated in number of pages. can't put in summery band due same reason. i unable put in column footer band or other footers because displays below error net.sf.jasperreports.engine.jrexception: net.sf.jasperreports.engine.jrruntimeexception: subreport overflowed on band not support overflow. @ com.jaspersoft.studio.editor.preview.view.control.reportcontroler.fillreport(reportcontroler.java:467) @ com.jaspersoft.studio.editor.preview.view.control.reportcontroler.access$18(reportcontroler.java:442) @ com.jaspersoft.studio.editor.preview.view.control.reportcontroler$4.run(reportcontroler.java:334) @ org.eclipse.core.internal.jobs.worker.run(worker.java:54) caused by: net.sf.jasperreports.engine.jrruntimeexception: subreport overflowe...
Read more

scala - play framework: Modules were resolved with conflicting cross-version suffixes -

-
i want use elastic search play framework followed this guide here build.sbt file name := """es-with-play""" version := "1.0-snapshot" lazy val root = (project in file(".")).enableplugins(playscala) scalaversion := "2.11.1" librarydependencies ++= seq( jdbc, anorm, cache, ws, "com.clever-age" % "play2-elasticsearch" % "1.4-snapshot" ) resolvers += "sonatype oss snapshots" @ "https://oss.sonatype.org/content/repositories/snapshots" and in play console when compile code gives following errors [error] modules resolved conflicting cross-version suffixes in {file:/media/sara/new%20volume/programs/programs/play/es-with-play/}root: [error] com.jsuereth:scala-arm _2.11, _2.10 [error] com.typesafe.play:play-functional _2.11, _2.10 [error] com.typesafe.akka:akka-actor _2.11, _2.10 [error] com.typesafe.play:play-json _2.11, _2.10 [error] com.type...
Read more

Save and close a word document by giving a name in R -

-
i trying use 2 libraries ( descstool , r2wd ) in order descriptive analysis of dataset saved in folder exploration later. these steps trying library(desctools) library(r2wd) data(iris) <- ls() wrd <- getnewwrd(header=true) wdget() desc(get(i), plotit=true, wrd=wrd) wdsave(name="temp.doc", wdapp=.r2wd) wdquit() although word capturing output supposed be, cannot save word file giving name (e.g.: temp.doc). can shed light here? try library(desctools) wrd <- getnewwrd() desc(iris, wrd=wrd) wrd[["activedocument"]]$saveas2(filename="describe iris.docx") wrd$quit()
Read more