CODEWITHSUNDEEP
javaspringscope
Program-Me-Rev
Program-Me-Rev

Reputation: 6624

How to use setters in Spring

I've realised that refferencing an instance of a spring bean of scope @Scope(proxyMode = ScopedProxyMode.TARGET_CLASS, value = "prototype") seems to call a new instance of the bean whenever the same instance gets referenced.

For example:

@Component
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS, value = "prototype")
class Item {

    .....
}

@Component
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS, value = "prototype")
class A {

    private Item item;

    public void setItem(Item item) {
        this.item = item;
    }

    public void method() {
        item.doSomething();
    }

}

@Component
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS, value = "prototype")
class B {

    @Autowired
    private A a;

    @Autowired
    private Item item;

    void bMethod() {
        a.setItem(item);
        a.method();
    }
}

The instance of A in a.setItem(item); seems to be different from that in a.method();, thereby making it imposible to use accessor methods in beans with scope of @Scope(proxyMode = ScopedProxyMode.TARGET_CLASS, value = "prototype").

Is this an expected behaviour? Am I missing some understanding on the usage of @Scope(proxyMode = ScopedProxyMode.TARGET_CLASS, value = "prototype")?

Upvotes: 2

Views: 192

Answers (1)

Sotirios Delimanolis
Sotirios Delimanolis

Reputation: 279930

Get rid of the proxyMode on your A bean. With a proxyMode of TARGET_CLASS, the bean is actually a proxy which delegates any method invocation to a new instance.

Upvotes: 2

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