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POMYSQL JDBC ERROR
 

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    <p>This is a simple program where i create two tables in a database using jdbc and sql.</p> <pre><code>Connection con=null; try { Class.forName("com.mysql.jdbc.Driver"); con=DriverManager.getConnection("jdbc:mysql://localhost:3306/","root","root"); try { Statement st=con.createStatement(); st.executeUpdate("CREATE DATABASE IF NOT EXISTS ARCPAGE"); st.executeUpdate("USE ARCPAGE"); st.executeUpdate("CREATE TABLE IF NOT EXISTS User(user_id integer NOT NULL AUTO_INCREMENT,user_name varchar(20) NOT NULL,user_pass varchar(20) NOT NULL,PRIMARY KEY (user_id))"); st.executeUpdate("CREATE TABLE IF NOT EXISTS Usermap(user_name varchar(20) NOT NULL,role_name varchar(20) NOT NULL)"); ResultSet res=st.executeQuery("SELECT * FROM USER"); res.next(); ResultSet resmap=st.executeQuery("SELECT * FROM USERMAP WHERE USER_NAME='"+res.getString("user_name")+"'"); /*error line */ res.next(); resmap=st.executeQuery("SELECT * FROM USERMAP WHERE USER_NAME='"+res.getString("user_name")+"'"); } catch(SQLException e) { System.out.println("SQL ERROR"); } } catch(Exception e) { System.out.println("ERROR"); } </code></pre> <p>on executing the code i get an "SQL ERROR" from the catch block.on further investigation i see that the error is from the /<em>error line</em>/ which i marked. what am i doing wrong???</p> <p>-krishan</p> <p>on e.printstacktrace()</p> <pre><code>java.sql.SQLException: Operation not allowed after ResultSet closed at com.mysql.jdbc.ResultSet.checkClosed(ResultSet.java:652) at com.mysql.jdbc.ResultSet.next(ResultSet.java:5942) at trees.TreeBean.&lt;init&gt;(TreeBean.java:51) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:184) at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:98) at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:405) at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:265) at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:191) at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:73) at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:71) at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:69) at org.apache.el.parser.AstValue.getValue(AstValue.java:112) at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:106) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178) at javax.faces.component.UIOutput.getValue(UIOutput.java:164) at org.primefaces.util.ComponentUtils.getStringValueToRender(ComponentUtils.java:61) at org.primefaces.component.inputtext.InputTextRenderer.encodeMarkup(InputTextRenderer.java:86) at org.primefaces.component.inputtext.InputTextRenderer.encodeEnd(InputTextRenderer.java:53) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879) at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:308) at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:181) at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:125) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643) at javax.faces.render.Renderer.encodeChildren(Renderer.java:164) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) at org.primefaces.component.tabview.TabViewRenderer.encodeContents(TabViewRenderer.java:180) at org.primefaces.component.tabview.TabViewRenderer.encodeMarkup(TabViewRenderer.java:120) at org.primefaces.component.tabview.TabViewRenderer.encodeEnd(TabViewRenderer.java:61) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:309) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Unknown Source) </code></pre>
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    1. COPlease call `e.printStackTrace()`in your exception handlers and paste the result here.
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    2. COIn your exception block, print the stack trace - e.printStackTrace() to get more details.
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