How to inject only one property into class

Question

I have a class

class A{
     private Foo foo;
     private Bar bar;
     private Baz baz;
}

Now this class has constructor that initializes foo and bar. Baz however has an DataSource field which I want o be injected with spring. The A class constructor initializes all but NOT baz. Now the A class in initialized with new.

A a = new A(Foo, Bar)

The A class has the setter. Bean

<bean id="ABean" class="com.acme.A" >
        <property name="baz">
                    <bean class="com.acme.baz">
                            <property name="dataSource" ref="mysqlDataSource">  </property> 
                    </bean>     
        </property>
    </bean> 

but i keep getting:

nested exception is java.lang.NoSuchMethodException: com.acme.A.<init>()

1. How to inject only one property per bean while the rest is initialized with constructor?

2. What other way this can be solved?

Answer 1

For arguments to the constructor use the constructor-arg xml tag and for parameters that are set using setters use the property xml tag.

For that to work you need to define setBaz() method.

Then you should use getBean() and not construct the object yourself. Let spring build it for you.