Question

The scenario of the problem is this

1) We map the struts field values to the dtos. The dtos contain integer fields which again are displayed on the screen.

2) Now I enter an incorrect value which gives conversion error for that integer field.

3) At that point in time I decide to quit the page(i.e press cancel), I get a conversion error. This is because the StrutsConversionErrorInterceptor gets called everytime.

Is there any way that I can skip the strutsConversionErrorInterceptor when I am calling a particular method the way we can skip validation using excludeMethods

Answer 1

Use this code to override Struts’s StrutsConversionErrorInterceptor…

public class MyConversionErrorInterceptor extends AbstractInterceptor {

    private static final long serialVersionUID = 1L;

    public static final String ORIGINAL_PROPERTY_OVERRIDE = "original.property.override";

    protected Object getOverrideExpr(ActionInvocation invocation, Object value) {
         ValueStack stack = invocation.getStack();

            try {
                stack.push(value);

                return "'" + stack.findValue("top", String.class) + "'";
            } finally {
                stack.pop();
            }
    }

    @Override
    public String intercept(ActionInvocation invocation) throws Exception {

        ActionContext invocationContext = invocation.getInvocationContext();
        Map<String, Object> conversionErrors = invocationContext.getConversionErrors();
        ValueStack stack = invocationContext.getValueStack();

        HashMap<Object, Object> fakie = null;

        BaseAction baseAction = (BaseAction) invocation.getAction();
        String buttonName = baseAction.getButtonName();

        for (Map.Entry<String, Object> entry : conversionErrors.entrySet()) {
            String propertyName = entry.getKey();
            Object value = entry.getValue();

            if (shouldAddError(propertyName, value)) {
                String message = XWorkConverter.getConversionErrorMessage(propertyName, stack);

                Object action = invocation.getAction();
                if (action instanceof ValidationAware) {
                    ValidationAware va = (ValidationAware) action;
                      if(buttonName.equalsIgnoreCas("Next")){
                          va.addFieldError(propertyName, message);
                      }
                }

                if (fakie == null) {
                    fakie = new HashMap<Object, Object>();
                }
                 if(buttonName.equalsIgnoreCas("Next")){
                     fakie.put(propertyName, getOverrideExpr(invocation, value));
                 }
            }
        }

        if (fakie != null) {
            // if there were some errors, put the original (fake) values in
            // place right before the result
            stack.getContext().put(ORIGINAL_PROPERTY_OVERRIDE, fakie);
            invocation.addPreResultListener(new PreResultListener() {
                public void beforeResult(ActionInvocation invocation, String resultCode) {
                    Map<Object, Object> fakie = (Map<Object, Object>) invocation.getInvocationContext().get(ORIGINAL_PROPERTY_OVERRIDE);

                    if (fakie != null) {
                        invocation.getStack().setExprOverrides(fakie);
                    }
                }
            });
        }

        return invocation.invoke();
    }

    protected boolean shouldAddError(String propertyName, Object value) {

        if (value == null) {
            return false;
        }

        if ("".equals(value)) {
            return false;
        }

        if (value instanceof String[]) {
            String[] array = (String[]) value;

            if (array.length == 0) {
                return false;
            }

            if (array.length > 1) {
                return true;
            }

            String str = array[0];

            if ("".equals(str)) {
                return false;
            }
        }

        return true;

    }

}

You can specify you button names on which you want validation to fire. In above code I have used “Next” in code you can see

if(buttonName.equalsIgnoreCas(“Next”))