I'm a newbie to spring and wonder how java based configs can be converted to xml based bean configs. I know that annotation based configs are more used now a days. But my requirement is to use xml based configs. Bean configuration is added below.
@Bean DataStoreWriter<String> dataStoreWriter(org.apache.hadoop.conf.Configuration hadoopConfiguration) { TextFileWriter writer = new TextFileWriter(hadoopConfiguration, new Path(basePath), null); return writer; You can create bean directly in xml configuration
<bean id="dataStoreWriter" class="TextFileWriter"> <constructor-arg index="0" ref="hadoopConfigBean"/> <constructor-arg index="1"> <bean class="Path"> <constructor-arg index="0" value="/tmp"/> </bean> </constructor-arg> </bean> If you need non-trivial bean configuration then you can use factory method call in xml configuration
<bean id="dataStoreWriter" class="DataStoreFactory" factory-method="dataStoreWriter"> <constructor-arg index="0" ref="hadoopConfigBean"/> <constructor-arg index="1" value="/tmp"/> </bean> Factory class should look like
public class DataStoreFactory { public static DataStoreWriter<String> dataStoreWriter(Configuration hadoopConfiguration, String basePath) { // do something here TextFileWriter writer = new TextFileWriter(hadoopConfiguration, new Path(basePath), null); return writer; } } 
@Bean is a method-level annotation and a direct analog of the XML element. The annotation supports most of the attributes offered by , such as: init-method, destroy-method, autowiring, lazy-init, dependency-check, depends-on and scope.
When you annotate method @bean spring container will execute that method and register the return value as a bean within a BeanFactory. By default, the bean name will be the same as the method name.
@Configuration public class AppConfig { @Bean public TransferService transferService() { return new TransferServiceImpl(); } } Note :Use @bean along with @configuration