spring boot autoconfiguration with jdbc template autowiring dataSource issue

Question

I'm new to Spring and to J2EE in general. I'm having trouble using JDBC template with Spring Boot autoconfiguration.

What I did was I took the example of RESTful web service provided here and decided to extend it to use JDBC template relational database access. Unfortunately another example provided cannot be useful because the only difficulty which is providing dataSource from xml beans file is not considered.

What I tried to solve the issue:

1. Using DAO Impl class as extend of different implementations from Spring.
2. Adding to beans file.
3. Using different DataSource classes (eg DriverManagerDataSource).
4. Trying to autowire just a simple attribute in a different class (something less complex then data source).
5. On the beggining I just written DAO class, but then I though that maybe it is possible to autowire datasource only if it implements an interface, tryed it, didn't help.

I tryed everything I found on Stack or Google. Most examples are seriously outdated or unanswered or have nothing to do with Spring Boot Autoconfiguration et cetera.

I keep getting Property 'dataSource' is required error, after struggling if finally managed to link the application-config.xml file with beans, but can't manage to autowire the datasource for JDBC.

I'm desperade to finish it and seriously blocked, out of ideas, I would be greatfull if somebody could provide a recent example that works with Spring Boot Autoconfigurations, beans in XML find, autowired datasource for JDBC.

Or at least some ideas, clues, even how to look for it, because I'm even out of keywords for google'ing.

Thanks!

Spring Application class.

package ws;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;

@Configuration
@ComponentScan
@ImportResource("classpath:spring/application-config.xml")
@EnableAutoConfiguration
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Web Service class.

package ws;

import dao.UserDAOImpl;
import model.User;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestWS {
    @RequestMapping("/greeting")
    public User greeting(@RequestParam(value="name", defaultValue="World") String name) {
    return new User("ubububu", "661331555", 0);
    }
    @RequestMapping("/create")
    public String initialize() {
        UserDAOImpl users = new UserDAOImpl();
        users.init();
        return "seems ok";
    }
}

DAO interface

package dao;

import model.User;

public interface UserDAO {
    public void insert(User usr);
    public void init();
    public User select(int id);
}

DAO implementation

package dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.stereotype.Repository;

import model.User;
import dao.UserDAO;

@Repository
public class UserDAOImpl implements UserDAO {
    private JdbcTemplate jdbcTemplate;
    private DriverManagerDataSource dataSource;
    @Autowired
    public void setDataSource(DriverManagerDataSource dataSource) {
        this.dataSource = dataSource;
    }

    public void insert(User usr) {
        String sql = "INSERT INTO USER " +
                "(USR_ID, EMAIL, PHONE) VALUES (?, ?, ?)";

        this.jdbcTemplate = new JdbcTemplate(dataSource);
        jdbcTemplate.execute(sql);
    }

    public void init() {
        String sql = "CREATE TABLE USER (USR_ID INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,EMAIL VARCHAR(30) NOT NULL,PHONE VARCHAR(15) NOT NULL)";
        this.jdbcTemplate = new JdbcTemplate(dataSource);
        jdbcTemplate.execute(sql);
    }
}

Data model

package model;

public class User {
    private String email;
    private String phone;
    private int id;
    public User(String email, String phone, int id) {
        this.email = email;
        this.phone = phone;
        this.id = id;
    }
    public int getUsrId(){
        return this.id;
    }
    public String getUsrEmail() {
        return this.email;
    }
    public String getUsrPhone() {
        return this.phone;
    }
}

Configuration bean file

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <import resource="Spring-User.xml" />-->
    <context:component-scan base-package="ws"/>
    <bean id="ds" 
         class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName" value="org.springframework.jdbc.core.JdbcTemplate" />
        <property name="url" value="jdbc:mysql://localhost/:3306/databasename" />
        <property name="username" value="root" />
        <property name="password" value="password" />
    </bean>
    <bean id="UserDAOprovider" class="dao.UserDAOImpl">
        <property name="dataSource" ref="ds" />
    </bean> 

</beans>

Error message:

ERROR [dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalArgumentException: Property 'dataSource' is required] with root cause
java.lang.IllegalArgumentException: Property 'dataSource' is required
    at org.springframework.jdbc.support.JdbcAccessor.afterPropertiesSet(JdbcAccessor.java:135) ~[spring-jdbc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.<init>(JdbcTemplate.java:169) ~[spring-jdbc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at dao.UserDAOImpl.init(UserDAOImpl.java:66) ~[demo3-0.0.1-SNAPSHOT.jar!/:na]
    at ws.TestWS.initialize(TestWS.java:30) ~[demo3-0.0.1-SNAPSHOT.jar!/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0_33]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.6.0_33]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.6.0_33]
    at java.lang.reflect.Method.invoke(Method.java:622) ~[na:1.6.0_33]
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215) ~[spring-web-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) ~[spring-web-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) ~[spring-webmvc-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) ~[spring-web-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.0.8.RELEASE.jar!/:4.0.8.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1736) ~[tomcat-embed-core-7.0.57.jar!/:7.0.57]
    at org.apache.tomcat.util.net.NioEnd

Answer 1

The simplest way to configure a DataSource in Spring Boot is to create an application.properties file under src/main/resources with the following content (may need to update it with correct url, username and password):

spring.datasource.url=jdbc:mysql://localhost/:3306/databasename
spring.datasource.username=root
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Spring Boot will automatically create the DataSource class for you and inject it to other beans. As a result of that, you won't need the xml config file anymore and may get rid of this line in the Application class:

@ImportResource("classpath:spring/application-config.xml")

Also, in the UserDAOImpl Spring can autowire the JdbcTemplate object using the DataSource bean (http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-sql.html#boot-features-using-jdbc-template) so you don't need to create one each time the insert() method is called.

As for the init() method in UserDAOImpl, you could create a schema.sql file under src/main/resources and move the CREATE TABLE statement there (for more details see http://docs.spring.io/spring-boot/docs/1.2.0.RELEASE/reference/htmlsingle/#howto-intialize-a-database-using-spring-jdbc)

See this example for more information: http://xantorohara.blogspot.ca/2013/11/spring-boot-jdbc-sample.html