define two beans of same class in single application context

Question

if I am defining two beans of same class and not giving any scope. Then how many instance of class will get created. for example

in applicationContext.xml

<bean name="testBean" class="com.test.Example"/>
<bean name="myBean" class="com.test.Example"/>

Answer 1

Spring will create two beans of the type com.test.Example and the autowiring will be for the type or method name (or Qualifiers), see Spring IOC

See this simple test:

With this class

public static class TestBean {
    static int INT = 1;
    public int test;
    public TestBean() {
        test = INT++;
    }


}

Configuration xml:

<bean name="testBean" class="com.test.TestBean"/>
<bean name="myBean" class="com.test.TestBean"/>

JUnit4 with spring container test:

@Resource
TestBean testBean;

@Resource
TestBean myBean;

@Test
public void test() {

    assertNotNull(testBean);
    assertNotNull(myBean);
    assertFalse(testBean == myBean);
    assertFalse(testBean.test == myBean.test);
}

This test dont fail, as you see, two beans of type TestBean are created.

See this part in the Spring Doc:

byName
Autowiring by property name. Spring looks for a bean with the same name as the property that needs to be autowired. For example, if a bean definition is set to autowire by name, and it contains a master property (that is, it has a setMaster(..) method), Spring looks for a bean definition named master, and uses it to set the property.

byType
Allows a property to be autowired if exactly one bean of the property type exists in the container. If more than one exists, a fatal exception is thrown, which indicates that you may not use byType autowiring for that bean. If there are no matching beans, nothing happens; the property is not set.

constructor
Analogous to byType, but applies to constructor arguments. If there is not exactly one bean of the constructor argument type in the container, a fatal error is raised.