How Can I Pass jdbc.properties to Spring/Hibernate? - spring

Question

I am getting the following error while trying to pass in values from a properties file to Spring, so that I don't have to supply them directly in hibernate.cfg.xml. Is there a better (and correct) approach? I know that the properties file is being referenced because if I put in in invalid password, it fails on that. I'd be grateful for any help.
WARNING: No connection properties specified - the user must supply JDBC connections
Exception in thread "main" org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:57)
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:39)
at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:426)
This is applicationContext.xml:
<context:component-scan base-package="cmsutil"/>
<context:property-placeholder location="jdbc.properties"/>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${jdbc.driverClassName}"
p:url="${jdbc.url}"
p:username="${jdbc.username}"
p:password="${jdbc.password}"/>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
p:dataSource-ref="dataSource"
p:configurationClass="org.hibernate.cfg.AnnotationConfiguration"
p:packagesToScan="cmsutil.*">
<property name="exposeTransactionAwareSessionFactory" value="false" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
<prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
</props>
</property>
</bean>
<bean id="txnManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory"/>
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
This is my hibernate.cfg.xml file:
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<mapping resource="cmsutil.entity/contentcomponent.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Per Ramesh's request - web.xml
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>redirect.jsp</welcome-file>
</welcome-file-list>
</web-app>
For Ramesh, this is my jdbc.properties, located in the root directory (/src/java/jdbc.properties)
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://xx:3306/x
jdbc.username=y
jdbc.password=z
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
hibernate.format_sql=false
hibernate.generate_statistics=false

Answer 1

add this bean in your applicationContext.xml
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location"><value>classpath:jdbc.properties</value></property>
</bean>
update this in web.xml instead of listener
<servlet>
<servlet-name>context</servlet-name>
<servlet-class>
org.springframework.web.context.ContextLoaderServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

Answer 2

I had the same issue but it was the result of an error in my java code. It required calling configure() on the Configuration before calling buildSessionFactory().
The javadoc for configure() method:
Use the mappings and properties specified in an application resource
named hibernate.cfg.xml.
Broken Code:
public static void main(String[] args) {
Configuration cfg = new Configuration();
factory = cfg.buildSessionFactory(); // missing the configure() call
Session s = factory.openSession();
Transaction tx = null;
try {
tx = s.beginTransaction();
Solution:
public static void main(String[] args) {
Configuration cfg = new Configuration();
factory = cfg.configure().buildSessionFactory();
Session s = factory.openSession();
Transaction tx = null;
try {
tx = s.beginTransaction();
Note: I was not using a Spring config.