My masters colleague, Guilherme Hobold, and his friend, Elinton Machado, have created a very interesting project for helping Java ME applications with dependency injection. Actually, it is not only for Java ME (CLDC), but because of there is no reflection, they have done some magic to make it work in a nice way.

The project is called DIME, which means Dependency Injection for Java ME. Basically it has a XML to configure the beans (it depends on kXML lib for parsing), a container to get the beans and the classes have to implemented a Bean interface that provides access to the hash table that is used to set the correct values. The XML file uses the same notation as Spring.

Here is some sample code that I got from the project page.

XML file (also supports map and other types).
<?xml version="1.0"?>
<beans>
      <import resource="other_beans.xml" />

      <bean id="fooSet" class="test.collection.FooList">
            <property name="elements">
                  <set>
                        <value>element1</value>
                        <value>element2</value>
                  </set>
            </property>
      </bean>

      <bean id="Foo" class="test.Foo">
            <property name="filename">
                  <value>movies2.txt</value>
            </property>
            <property name="fooSet" ref="fooSet"/>
      </bean>
</beans>

Make a bean:
import java.util.Hashtable;
import org.dime.Bean;
import test.collection.FooList;
public class Foo extends FooAbstract implements Bean {

      private String filename;
      private FooList fooSet;

      public String getFilename() {
            return filename;
      }

      public void setProperties(Hashtable properties) {
            filename = (String)properties.get("filename");
            fooSet = (FooList)properties.get("fooSet");
      }
}

Load the XML file and get the bean:
BeanContainer container = new ClassPathXmlBeanContainer("file.xml");
Foo foo = (Foo)container.getBean("Foo");
System.out.println(foo.getFilename());


Very nice job! Take a look in the project page for more information. Take a try!

http://dime.dev.java.net

Cheers,
Bruno Ghisi