@WebServlet("/hello")
public class HelloWorldServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().println("Hello, World!");
}
}
<servlet>
<servlet-name>HelloWorldServlet</servlet-name>
<servlet-class>com.example.HelloWorldServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorldServlet</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
@Entity
public class User {
@Id
private Long id;
private String name;
// Getters and setters
}
<persistence-unit name="myPU" transaction-type="JTA">
<class>com.example.User</class>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/mydatabase"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="password"/>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
</properties>
</persistence-unit>
