I am using Play Framework along with Spring JbbcTemplates. I am using spring DriverManagerDataSource as the datasource for JdbcTemplate. Now, for some tables, I would like to use the Play Model bean. Is this possible? If so, how to make use of the same datasource (used by spring) to load the Play Model Beans. Please advise.
I found a hack for the above mentioned problem. Just created a plugin, and in the onApplicationStartUp(), assing the spring datasource to DB.datasource. Also, we need change the priority of the plugins so tat, spring plugin gets loaded before the JPA plugin.
Please find the code snippet,
play.plugins (place it under the "app" folder of your play project.
388:play.modules.spring.SpringPlugin
399:com.ebay.pricing.catgyautomn.plugin.LoadSpringDsPlugin
//LoadSpringDsPlugin.java
public class LoadSpringDsPlugin extends PlayPlugin {
#Override
public void onApplicationStart() {
Logger.debug("***********LoadSpringDsPlugin:onApplicationStart begins************");
DataSource dataSource = Spring.getBeanOfType(DataSource.class);
DB.datasource = dataSource;
Logger.debug("***********LoadSpringDsPlugin:onApplicationStart ends************");
}
application-context.xml
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
Related
With MyBatis-Spring-Boot-Starter, we can easily integrate MyBatis with Spring Boot, it works perfectly for one data source. However, now we'd like to add an extra data source in our project, unfortunately it seems not easy.
In MyBatis official documentation, I see the following content:
MyBatis-Spring-Boot-Starter will:
Autodetect an existing DataSource.
Will create and register an instance of a SqlSessionFactoryBean passing that DataSource as an input.
Will create and register an instance of a SqlSessionTemplate got out of the SqlSessionFactoryBean.
It looks like MyBatis-Spring-Boot-Starter supports only one data source at this moment. So, the question is how to configure multiple MyBatis datasources in Sping Boot?
You outlined 3 beans that are needed for MyBatis+Spring integration. These are automatically created for single data source.
If you need two data sources, you need to create 3 beans for each data source explicitly. So you'll be creating 6 beans (2 of type DataSource, 2 of type SqlSessionFactoryBean and 2 of type SqlSessionFactoryBean).
To bind DAO with certain datasource, you will need to use sqlSessionTemplateRef or sqlSessionFactoryRef parameter of #MapperScan annotation.
Also I don't recommend to go down the XML hell. I was using it this way in PROD, with two data sources, without any ugly XML configs on various projects. Also SQL queries were annotated.
Shame is that MyBatis documentation is not great and most examples out there are in XML.
Something this like this to your spring servlet.xml:
<bean id="db2dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName"><value>${db2.database.driver}</value></property>
<property name="url"><value>${db2.database.url}</value></property>
<property name="username"><value>${db2.database.username}</value></property>
<property name="password"><value>${db2.database.password}</value></property>
<property name="maxActive"><value>${db2.database.maxactiveconnections}</value></property>
<property name="maxIdle"><value>${db2.database.idleconnections}</value></property>
<property name="initialSize"><value>${db2.database.initialSize}</value></property>
</bean>
<bean id="db2SqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="db2dataSource" />
<property name="configLocation" value="/WEB-INF/mybatis-config.xml"/>
</bean>
<bean id="db2Dao" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="sqlSessionFactory" ref="db2SqlSessionFactory"/>
<property name="mapperInterface" value="com.dao.db2Dao" />
</bean>
<bean id="oracledataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName"><value>${oracle.database.driver}</value></property>
<property name="url"><value>${oracle.database.url}</value></property>
<property name="username"><value>${oracle.database.username}</value></property>
<property name="password"><value>${oracle.database.password}</value></property>
<property name="maxActive"><value>${oracle.database.maxactiveconnections}</value></property>
<property name="maxIdle"><value>${oracle.database.idleconnections}</value></property>
<property name="initialSize"><value>${oracle.database.initialSize}</value></property>
</bean>
<bean id="oracleSqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="oracledataSource" />
<property name="configLocation" value="/WEB-INF/mybatis-config.xml"/>
</bean>
<bean id="oracleoardDao" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="sqlSessionFactory" ref="oracleSqlSessionFactory"/>
<property name="mapperInterface" value="com.lodige.clcs.dao.oracleoardDao" />
</bean>
Maybe this is what you need
#Configuration
#MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef =
"test1SqlSessionTemplate")
public class DataSource1Config {
#Bean(name = "test1DataSource")
#ConfigurationProperties(prefix = "spring.datasource.test1")
#Primary
public DataSource testDataSource() {
return DataSourceBuilder.create().build();
}
#Bean(name = "test1SqlSessionFactory")
#Primary
public SqlSessionFactory testSqlSessionFactory(#Qualifier("test1DataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
return bean.getObject();
}
#Bean(name = "test1TransactionManager")
#Primary
public DataSourceTransactionManager testTransactionManager(#Qualifier("test1DataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
#Bean(name = "test1SqlSessionTemplate")
#Primary
public SqlSessionTemplate testSqlSessionTemplate(#Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
I am trying to create a spring web app which is using JdbcTemplate and SpringDaoSupport. When I am defining the datasource bean through dispatcher-servlet xml it's working fine. i.e.
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:#localhost:1521:XE"/>
<property name="username" value="system"/>
<property name="password" value="password1$"/>
</bean>
But whenever I'm tryinh to configure the dataSource bean through program, it getting exception.The configuration is as follows:
In code:
#Configuration
public class AppConfig {
#Bean
public DriverManagerDataSource dataSource() {
DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
driverManagerDataSource.setDriverClassName("oracle.jdbc.driver.OracleDriver");
driverManagerDataSource.setUrl("jdbc:oracle:thin:#localhost:1521:XE");
driverManagerDataSource.setUsername("username");
driverManagerDataSource.setPassword("password");
return driverManagerDataSource;
}
}
In XML:
<bean id="dataSource" class="com.example.AppConfig" />
In your dispatcher-servlet.xml you need to make sure you have either:
<context:annotation-config/>
<bean class="com.example.AppConfig" />
or
<context:component-scan base-package="com.example"/>
I am beginning with spring and I am working on the web mvc. When not in MVC, as pointed in some tutorial, I would specify the data source in beans.xml and call this file with ApplicationContext object, and creating an object by passing the data source. And that worked for me. and when I came back to MVC, I created the data source in my name-servlet.xml file by using
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/hello"/>
<property name="username" value="root"/>
<property name="password" value=""/>
</bean>
and I have a superclass used for my service classes for data access, only with method setDataSource. and here is my sample.
#Resource(name="dataSource")
public void setDataSource(DataSource dataSource){
this.dataSource=dataSource;
this.jdbcTemplateObject = new JdbcTemplate(dataSource);
}
but I am still getting a null pointer exception when working with the dataSource. please what am i missing?
Hello I'm new to Hibernate.
I have generated with Hibernate Tools a database access module. The generator generates the code of the DAOS and Hibernate Beans.
When I test this module in a simple Java application all works fine, but when I test it in a Spring Web application I get a very strange error. Since my module is an independent jar it should access the database without regarding the circumstance of being executed in a simple Java application or a Web application. The code of my web application is:
#Controller
#RequestMapping("/")
public class Controller implements ApplicationContextAware
{
private ApplicationContext applicationContext;
#RequestMapping(value = "/purchased/songs", method = RequestMethod.GET)
public String home(Model model)
{
SessionManager.startOperation();
ChargeTryDAOBase ctdb=new ChargeTryDAOBase();
List <ChargeTry> data=ctdb.findByRemoteId("dsfsdfsdf8");
SessionManager.endOperation();
model.addAttribute("result", "data" );
return "home";
}
#Override
public void setApplicationContext(ApplicationContext arg0) throws BeansException
{
this.applicationContext = arg0;
}
}
When running this code on Tomcat I get following error:
org.springframework.web.util.NestedServletException: Handler processing
nested exception is java.lang.NoSuchMethodError:
org.hibernate.SessionFactory.getCurrentSession()Lorg/hibernate/Session;
.....
java.lang.NoSuchMethodError:
org.hibernate.SessionFactory.getCurrentSession()Lorg/hibernate/Session;
When I change some Hibernate dependencies I get following error:
java.lang.IllegalStateException: Could not locate SessionFactory in JNDI
When I test the above code in a simple Java application all works fine.
Is this a spring-hibernate configuration problem?
Thank you for your help.
Please study
1: http://www.javatpoint.com/hibernate-and-spring-integration
and
2 http://viralpatel.net/blogs/spring3-mvc-hibernate-maven-tutorial-eclipse-example/
to get insight of Spring MVC and Hibernate Integration.
You can work with Hibernate Configuration file - here is the link -
Spring and hibernate.cfg.xml
But as your application is within a spring managed container, We will highly recommend to use applicationcontext.xml for better maintenance and management of codebase and performance.
thank you for your help finally I got all working. I followed your link and googled a little bit. The problem was that I didn't enable in my hibernate.cfg.xml file the datasource parameter, I also have configured C3P0 jdbc connection provider.
My final hibernate.cfg.xml file is:
<hibernate-configuration>
<session-factory>
<property name="hibernate.bytecode.use_reflection_optimizer">true</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
<property name="current_session_context_class">thread</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mydb</property>
<property name="hibernate.connection.username">userdb</property>
<property name="hibernate.connection.password">12345</property>
<property name="hibernate.connection.datasource">java:comp/env/jdbc/mydb</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.use_sql_comments">true</property>
<property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.min_size">2</property>
<property name="hibernate.c3p0.numHelperThreads">4</property>
<property name="hibernate.c3p0.max_size">10</property>
<property name="hibernate.c3p0.timeout">300</property>
<property name="hibernate.c3p0.max_statements">100</property>
<property name="hibernate.c3p0.idle_test_period">1800</property>
<property name="hibernate.c3p0.acquire_increment">2</property>
<hibernate-configuration>
<session-factory>
In my web.xml I have added following lines:
<resource-ref>
<description>This is a MySQL database connection</description>
<res-ref-name>jdbc/mydb</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
In the Spring context file I have added following lines:
<beans:bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<beans:property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<beans:property name="url" value="jdbc:mysql://localhost:3306/mydb"/>
<beans:property name="username" value="userdb"/>
<beans:property name="password" value="12345"/>
</beans:bean>
<beans:bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<beans:property name="dataSource" ref="dataSource" />
<beans:property name="configLocation">
<beans:value>classpath:hibernate.cfg.xml</beans:value>
</beans:property>
</beans:bean>
The strange thing is, that with the default Hibernate connection provider, the above solution didn't work but when I configured C3P0 all started to work.
Thank you for your help.
I am trying to inject the datasource object into a servlet. I have the logger to print in the set method. It works ok on pre-inialization. But when I request the servlet it gives me nullPointerException.
Any suggestion on why this happen? (I don't think this related to the servlet I am extending)
Here is the applicationContext.xml
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<bean id="dataServlet" class="com.mycom.util.DataServlet">
<property name="dataSource" ref="dataSource" />
<property name="test" value="dataSource" />
</bean>
The servlet
public class DataServlet extends DataSourceServlet {
...
#Autowired
public void setDataSource(DataSource dataSource) {
this.jdbcTemplate = new JdbcTemplate(dataSource);
logger.log(Level.INFO, "Inj: datasrc");
}
#Autowired
public void setTest(String test) {
this.test = test;
logger.log(Level.INFO, "Set Test {0}", this.test);
}
}
I set break point # the setTest, it breaks # pre-init. but when the actual object being request. It is doesn't break # the setTest.
Why is it so? (singleton/ scope issue related?)
Please advise!
Thanks in advance!
You have two instances of your servlet:
one managed by Spring, which has DataSource injected properly
second one created by Tomcat, that knows nothing about Spring (and doesn't have the DataSource)
Actually if you would use #Resource instead of #Autowired Tomcat (tested on 7.0) will scream that DataSource is not bound to JNDI (which proves it is the servlet container that managed the servlet lifecycle).
Your problem is that you want to inject Spring beans to an object that is completely out of Spring control. There are several workarounds for this problem:
DispatcherServlet and Spring MVC
HttpRequestHandlerServlet to dispatch all requests to handling Spring bean
WebApplicationContextUtils and fetch beans manually (nasty solution)
If you don't want to dive into MVC, I would suggest HttpRequestHandlerServlet. Here: 1, 2 is an example (should also work with Servlet prior 3.0)