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- import java.sql.Connection;
- import java.sql.DriverManager;
- import java.sql.SQLException;
- public class conectionclass {
- public static Connection getConnection(){
- Connection conn = null ;
- try {
- Class.forName("com.mysql.jdbc.Driver");
- conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/emps","root", "12345" );
- System.out.println("------------- Connection Succesful ----------------");
- } catch (SQLException | ClassNotFoundException e) {
- // TODO Auto-generated catch block
- System.out.println("------------- Connection Fail ----------------");
- e.printStackTrace();
- }
- return conn;
- }
- }
- @POST
- @Path("/postjson")
- @Produces("application/json")
- public Employee getJSONfromApp(HashMap p) {
- return ( new empdao()).getEmployee("test", "1234") ;
- }
- @Override
- public Employee getEmployee(String employee, String pass) {
- int count = 0 ;
- Connection conn = Connectionclass.getConnection();
- // System.out.println("Employee : "+employee+" Connection : "+conn);
- if(employee!=null || employee != "" )
- {
- String query = "select * from emps where username = '"+employee+"' && pass = '"+pass+"' ";
- try {
- Statement stmt = conn.createStatement() ;
- System.out.println("Statement created.."+ stmt);
- ResultSet a = stmt.executeQuery(query);
- while(a.next()){
- return (new Employee(a.getString(2) , a.getString(3) ));
- }
- } catch (Exception e) {
- // TODO Auto-generated catch block
- System.out.println("Error in connection.....");
- // e.printStackTrace();
- } finally{
- try {
- conn.close();
- } catch ( Exception e) {
- System.out.println("Error in closing connection.....");
- // e.printStackTrace();
- }
- }
- }
- return null;
- }
- ------------- Connection Fail ----------------
- java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
- at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305)
- at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157)
- at java.lang.Class.forName0(Native Method)
- at java.lang.Class.forName(Class.java:259)
- at com.app.App3.Connectionclass.getConnection(Connectionclass.java:13)
- at com.app.App3.empdao.getEmployee(empdao.java:47)
- at com.mkyong.rest.JSONService.getJSONfromApp(JSONService.java:90)
- at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
- at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
- at java.lang.reflect.Method.invoke(Method.java:483)
- at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140)
- at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:255)
- at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:220)
- at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:209)
- at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:519)
- at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:496)
- at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119)
- at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
- at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
- at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
- 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:502)
- 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:518)
- at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
- at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
- at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
- at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517)
- at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1474)
- 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:744)
- Error in connection.....
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