JSF converter causes validator(s) to be ignored

Question

Here\'s the field:

Answer 1

After reading BalusC's comment I am updating this post again.

I created a small demo application and to see the phases and when the conversion and validation occur.

View:

Managed bean:

@ManagedBean
@SessionScoped
public class DemoBean implements Serializable {
    private String field;

    public DemoBean() {
        System.out.println(Thread.currentThread().getStackTrace()[1]);
    }

    public String getField() {
        System.out.println(Thread.currentThread().getStackTrace()[1]);
        return field;
    }

    public void setField(String field) {
        System.out.println(Thread.currentThread().getStackTrace()[1]);
        this.field = field;
    }

    public String demoAxn() {
        System.out.println(Thread.currentThread().getStackTrace()[1]);
        return null;
    }
}

Converter:

@FacesConverter(value="demoConverter")
public class DemoConverter implements Converter {

    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        System.out.println(Thread.currentThread().getStackTrace()[1]);            
        return value;
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value) {
        System.out.println(Thread.currentThread().getStackTrace()[1]);
        return (String) value;
    }    
}

Validator:

@FacesValidator(value="demoValidator")
public class DemoValidator implements Validator {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        System.out.println(Thread.currentThread().getStackTrace()[1]);
    }

}

Phase listener:

public class DemoPhaseListener implements PhaseListener {
    @Override
    public void afterPhase(PhaseEvent event) {
        System.out.println(Thread.currentThread().getStackTrace()[1]);
        System.out.println("PhaseId: " + event.getPhaseId() + "  ===============================\n\n");        
    }

    @Override
    public void beforePhase(PhaseEvent event) {
        System.out.println("\n\nPhaseId: " + event.getPhaseId() + "  ===============================");
        System.out.println(Thread.currentThread().getStackTrace()[1]);        
    }

    @Override
    public PhaseId getPhaseId() {
        return PhaseId.ANY_PHASE;
    }    
}

Registered the phase listener:

    pkg.DemoPhaseListener

With that setting when the "Submit" button is clicked, the output is:

INFO: PhaseId: RESTORE_VIEW 1  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: RESTORE_VIEW 1  ===============================

INFO: PhaseId: APPLY_REQUEST_VALUES 2  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: APPLY_REQUEST_VALUES 2  ===============================

INFO: PhaseId: PROCESS_VALIDATIONS 3  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoConverter.getAsObject(DemoConverter.java:13)
INFO: pkg.DemoValidator.validate(DemoValidator.java:14)
INFO: pkg.DemoBean.getField(DemoBean.java:17)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: PROCESS_VALIDATIONS 3  ===============================

INFO: PhaseId: UPDATE_MODEL_VALUES 4  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoBean.setField(DemoBean.java:22)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: UPDATE_MODEL_VALUES 4  ===============================

INFO: PhaseId: INVOKE_APPLICATION 5  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoBean.demoAxn(DemoBean.java:27)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: INVOKE_APPLICATION 5  ===============================

INFO: PhaseId: RENDER_RESPONSE 6  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoBean.getField(DemoBean.java:17)
INFO: pkg.DemoConverter.getAsString(DemoConverter.java:20)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: RENDER_RESPONSE 6  ===============================

But when make change to throw a NPE in the converter as follows:

@Override
public Object getAsObject(FacesContext context, UIComponent component, String value) {
    System.out.println(Thread.currentThread().getStackTrace()[1]);            
    throw new NullPointerException();
}

the output is:

INFO: PhaseId: RESTORE_VIEW 1  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: RESTORE_VIEW 1  ===============================

INFO: PhaseId: APPLY_REQUEST_VALUES 2  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: APPLY_REQUEST_VALUES 2  ===============================

INFO: PhaseId: PROCESS_VALIDATIONS 3  ===============================
INFO: pkg.DemoPhaseListener.beforePhase(DemoPhaseListener.java:17)
INFO: pkg.DemoConverter.getAsObject(DemoConverter.java:13)
INFO: pkg.DemoPhaseListener.afterPhase(DemoPhaseListener.java:10)
INFO: PhaseId: PROCESS_VALIDATIONS 3  ===============================

INFO: pkg.DemoBean.getField(DemoBean.java:17)

But the stacktrace is displayed on the resulting view.