I can not understand why I get an error, like everything is in place.
import connection.pool.ConnectionPool; import coupon.beans.User; import coupon.exceptions.DuplicateUser; import system.exceptions.CouponSystemException; @Path("/register") public class Register { Connection con; @POST @Consumes(MediaType.APPLICATION_JSON) public void Registering(User user) throws CouponSystemException, DuplicateUser, IOException{ ConnectionPool con_pool = ConnectionPool.con_instance; String register = "INSERT INTO user(nickname,first_name,last_name,password,email,type)values(?,?,?,?,?,?)"; PreparedStatement pre; try { pre = con.prepareStatement(register); pre.setString(1,user.getNickName()); pre.setString(2,user.getFirstName()); pre.setString(3,user.getLastName()); pre.setString(4,user.getEmail()); pre.setString(5,user.getPassword()); pre.setObject(6,user.getType()); pre.execute(); }catch(com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException e){ throw new DuplicateUser("Sorry but this user is already exist"); }catch (SQLException e1) { throw new CouponSystemException("You have some problems that need to be fixed with your database.."); } finally{ con_pool.returnConnection(con); try { con.close(); } catch (SQLException e) { throw new CouponSystemException("You have some problems that need to be fixed with your database.."); } } } } Exception
java.lang.NoClassDefFoundError: system/exceptions/CouponSystemException at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) at java.lang.Class.getConstructors(Unknown Source) at com.sun.jersey.server.impl.modelapi.annotation.IntrospectionModeller.createResource(IntrospectionModeller.java:111) at com.sun.jersey.server.impl.application.WebApplicationImpl.getAbstractResource(WebApplicationImpl.java:745) at com.sun.jersey.server.impl.application.WebApplicationImpl.createAbstractResourceModelStructures(WebApplicationImpl.java:1522) at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1295) at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:169) at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:775) at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:771) at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193) at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771) at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766) at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488) at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318) at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609) at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210) at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373) at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556) at javax.servlet.GenericServlet.init(GenericServlet.java:158) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1238) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1151) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:828) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135) 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:141) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: system.exceptions.CouponSystemException at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1139) ... 39 more 
