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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.