Невозможно сделать соединение JDBC

Question

Я создаю проект веб-API с использованием Jersey и Hibernate. Когда я пробовал вчера, все работало хорошо. Сегодня он начал показывать ошибку «Невозможно сделать JDBC-соединение». Я попробовал все возможные способы проверить это. Тем не менее, я не могу ее разрешить. Любая помощь будет высоко оценен.

Я создаю сессию следующим образом:

SessionFactory sessionFactory; 
ServiceRegistry serviceRegistry; 
Configuration configuration = new Configuration(); 
configuration.configure("hibernate.cfg.xml"); 
serviceRegistry = new ServiceRegistryBuilder().applySettings(
      configuration.getProperties()).build(); 
sessionFactory = configuration.buildSessionFactory(serviceRegistry); 
Session session = sessionFactory.openSession(); 

А вот мои настройки подключения к базе данных

<!-- Database connection settings --> 
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 
<property name="connection.url">jdbc:mysql//127.0.0.1/sampleDB</property> 
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 

Ниже трассировка стека, за исключением:

javax.servlet.ServletException: org.hibernate.HibernateException: Unable to make JDBC Connection [jdbc:mysql//127.0.0.1/sampleDB] 
    org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:393) 
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:381) 
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:344) 
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:221) 


root cause 

org.hibernate.HibernateException: Unable to make JDBC Connection [jdbc:mysql//127.0.0.1/sampleDB] 
    org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.createConnection(BasicConnectionCreator.java:77) 
    org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:106) 
    org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111) 
    org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234) 
    org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206) 
    org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:260) 
    org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:94) 
    org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111) 
    org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234) 
    org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206) 
    org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887) 
    org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845) 
    com.ps.rs.controller.Hello.sayHtmlHello(Hello.java:93) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    java.lang.reflect.Method.invoke(Unknown Source) 
    org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) 
    org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:151) 
    org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:171) 
    org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:195) 
    org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:104) 
    org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:384) 
    org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:342) 
    org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101) 
    org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:271) 
    org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) 
    org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) 
    org.glassfish.jersey.internal.Errors.process(Errors.java:315) 
    org.glassfish.jersey.internal.Errors.process(Errors.java:297) 
    org.glassfish.jersey.internal.Errors.process(Errors.java:267) 
    org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:297) 
    org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:254) 
    org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1030) 
    org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:373) 
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:381) 
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:344) 
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:221) 

Answer 1

Это может помочь вам

Кроме того, добавьте имя пользователя и пароль

<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> 
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/sampleDB</property> 
    <property name="hibernate.connection.username">yourUserNameForMysql</property> 
    <property name="hibernate.connection.password">passwordForMySql</property> 

После Mysql использования 5.x класса org.hibernate.dialect.MySQL5Dialect

<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property> 
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/sampleDB</property> 
    <property name="hibernate.connection.username">yourUserNameForMysql</property> 
    <property name="hibernate.connection.password">passwordForMySql</property> 

Answer 2

изменения эта линия

<property name="connection.url">jdbc:mysql//localhost/sampleDB</property> 

в

<property name="connection.url">jdbc:mysql//localhost:3306/sampleDB</property> 

и вы должны быть через, как вам не хватает порта в связи URL. Yopu также отсутствуют

<property name="hibernate.connection.username"> 

    </property> 
    <property name="hibernate.connection.password"> 

    </property>