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Apache Struts 2 Documentation
Why does my setter not get called by the params interceptor
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## Why doesn't my setter get called ?

Aaron Johnson had a problem with a setter for a property that never seemed to get called. He had a getter/setter combination that did not match:

    public void setUser(String username) {
        ...
    }
    public User getUser() {
        ...
    }

The short answer is that your getter and setter must match the property type, or OGNL will not be able to call it (due to a reflection API semantics). You can read the full explanation here.