Trying to deploy a Spring Service on WSO2 Application Service - spring

Question

I'm trying to deploy a Spring Service in WSO2 Application Service. I did THIS tutorial and the app works fine on Eclipse, but when I try to deploy it on WSO2 I get this error:
Cannot load Spring beans. Please check the Spring context
configuration file and verify that the defined Spring beans exist in
the .jar file.
I unziped de .jar file and JdbcCustomerDAO class is there with all the others.
Spring context:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="customerDAO" class="com.mkyong.customer.dao.impl.JdbcCustomerDAO">
<property name="dataSource" ref="dataSource" />
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="url" />
<property name="username" value="username" />
<property name="password" value="password" />
</bean>
</beans>
I also tried to include spring and mysql-connector-java jars on /repository/components/extensions as says HERE.
EDIT:
ERROR {org.wso2.carbon.springservices.ui.SpringServiceMaker} - Cannot
load Spring beans. Please check the Spring context configuration file
and verify that the defined Spring beans exist in the .jar file.
{org.wso2.carbon.springservices.ui.SpringServiceMaker}
org.springframework.beans.factory.CannotLoadBeanClassException: Cannot
find class
[org.springframework.jdbc.datasource.DriverManagerDataSource] for bean
with name 'dataSource' defined in resource loaded through InputStream;
nested exception is java.lang.ClassNotFoundException:
org.springframework.jdbc.datasource.DriverManagerDataSource
Looks like it couldn't find spring-jdbc, so I added the jar to extensions but now I get this error:
ERROR {org.wso2.carbon.springservices.ui.SpringServiceMaker} - Cannot load
Spring beans. Please check the Spring context configuration file and
verify that the defined Spring beans exist in the .jar file.
{org.wso2.carbon.springservices.ui.SpringServiceMaker}
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'dataSource' defined in resource loaded
through InputStream: Instantiation of bean failed; nested exception is
org.springframework.beans.BeanInstantiationException: Could not
instantiate bean class
[org.springframework.jdbc.datasource.DriverManagerDataSource]:
Constructor threw exception; nested exception is
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
I understand that commons.logging is also missing, but when I try to add it to extensions, WSO2 doesn't start. I get a lot of
Log4j:ERROR Could not instantiate...