See full tutorial here : https://cedricleruth.com/how-to-set-jsf-binding-attribute-programmatically-in-oracle-adf/

HowToSetJsfAttributeValueProgrammaticallyInOracleADF.java

//There is multiple way to programmatically set a value of a view attribute in Oracle ADF :  

// 1. The JSF way using the highly recommended JSFUtils.java library function : 

/**
 * Method for setting a new object into a JSF managed bean
 * Note: will fail silently if the supplied object does
 * not match the type of the managed bean.
 * @param expression EL expression
 * @param newValue new value to set
 */
public static void setExpressionValue(String expression, Object newValue) {
	FacesContext facesContext = getFacesContext();
	Application app = facesContext.getApplication();
	ExpressionFactory elFactory = app.getExpressionFactory();
	ELContext elContext = facesContext.getELContext();
	ValueExpression valueExp = elFactory.createValueExpression(elContext, expression, Object.class);

	//Check that the input newValue can be cast to the property type
	//expected by the managed bean.
	//If the managed Bean expects a primitive we rely on Auto-Unboxing
	Class bindClass = valueExp.getType(elContext);
	if (bindClass.isPrimitive() || bindClass.isInstance(newValue)) {
		valueExp.setValue(elContext, newValue);
	}
}

JSFUtils.setExpressionValue("#{bindings.YOUR_VO_ATTRIBUTE.inputValue}","YOUR VALUE");

// 2. By binding the jsf component to your ADF Bean 

//Go To your component > Open property inspector > Set Binding Attribute to your Bean (will create the following getter and setter)


public void setMyInputText(RichInputText myInputText) {
	this.myInputText = myInputText;
}

public RichInputText getMyInputText() {
	return myInputText;
}

//then in your action you can just set and refresh component 
this.setMyInputText(YourValue);
AdfFacesContext.getCurrentInstance().addPartialTarget(this.getMyInputText);