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How to load multiple spring bean configuration files?


When you are developing any spring based complex application, the size of the xml based configuration file grows unmanageable. It is a standard practice to split the configuration file into multiple small configuration files based on functionality.

This page helps you to understand how to handle multiple spring bean configurations files, we can achieve this by using <import> tag. Lets take a simple example, you have seperated your configurations into two files, one is to manage jdbc configurations, and another one is to manage all beans. Below configuration file called database-config.xml handles all jdbc configurations:

<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-3.0.xsd">

	<bean id="dataSource" 
			class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName">
			<value>com.mysql.jdbc.Driver</value>
		</property>
		<property name="url">
			<value>jdbc:mysql://localhost:3306/java2novice</value>
		</property>
		<property name="username"><value>root</value></property>
		<property name="password"><value>password</value></property>
	</bean>
</beans>

Here is another configuration file which handles all beans with in the application, it is called bean-config.xml file:

<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-3.0.xsd">

	<bean id="appDao" class="com.java2novice.beans.MyAppDao" />
	<bean id="empEntity" class="com.java2novice.beans.Employee" />
	<bean id="companyBean" class="com.java2novice.beans.Company" />
</beans>

Now below configuration file imports the above two configuration files, it is called applicationContext.xml file. We need to load this file in our application to get all bean objects.

<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-3.0.xsd">

	<import resource="bean-config.xml" />
	<import resource="database-config.xml" />
</beans>
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Spring framework examples

  1. Spring 3 hello world example
  2. Spring bean java based configuration using @Configuration and @Bean
  3. How to get spring application context object reference?
  4. How to load multiple spring bean configuration files?
  5. Spring java based configuration @Import example
  6. Spring Dependency Injection and Types
  7. Spring Dependency Injection via setter method
  8. Spring Dependency Injection via Constructor
  9. Constructor overloading issue with spring constructor injection
  10. Constructor vs Setter dependency Injection in Spring
  11. How to inject value into spring bean instance variables?
  12. Spring bean tag properties
  13. Differen types of spring bean scopes
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  15. Set spring bean scope using annotation
  16. How to invoke spring bean init and destroy methods?
  17. Spring bean initialization callback
  18. Spring bean destruction callback
  19. Configure default initialization and destroy method in all spring beans
  20. Spring bean init and destroy methods using annotations
  21. Spring Bean Post Processors
  22. How to read property file in spring using xml based configuration file?
  23. How to read property file in spring 3.0 using java based configuration?
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  25. How to inject date into spring bean with CustomDateEditor?
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  30. How to inject Set into spring bean?
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  34. How to filter components in auto scanning?
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  36. Spring expression language basic example using annotations.
  37. Bean reference example using spring expression language
  38. Spring expression language operators example
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  41. How to use collections with spring expression language?
  42. Spring bean auto-wiring modes
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  48. Spring log4j configuration
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  50. Send E-mail using spring 3
  51. Send E-mail with attachment using spring 3
  52. Simple spring JDBC example
  53. Spring JDBC example with JdbcTemplate
  54. Spring JDBC example with JdbcDaoSupport
  55. Spring JDBC query example using JdbcDaoSupport
  56. How to query single column using spring JdbcTemplate?
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  58. Spring AOP Advices - Before advice example - xml based configuration
  59. Spring AOP Advices - After returning advice example - xml based configuration
  60. Spring AOP Advices - After throwing advice example - xml based configuration
  61. Spring AOP Advices - Around advice example - xml based configuration
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  64. Spring AOP - AspectJ - @Before example
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Knowledge Centre
Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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