How to exclude some codes that use refection API ?

[Steven]

Hi All,

         I use reflection in code as follow:

 public static void setFormFieldsToRequest(Object vo,
      HttpServletRequest request) throws Exception {
        Field[] fields = vo.getClass().getDeclaredFields();
        Field fie = null;

        for (int i = 0; i < fields.length; i++) {
            fie = fields[i];
            if (fie.getName().equals("serialVersionUID"))
                continue;
            else {
                Object fvalue = getFieldValue(fie, vo);
                request.setAttribute(fie.getName(), fvalue);
            }
        }
    }

It throwed the follow exception:

at Caused by: java.lang.Exception: can't process the type: class [Z
at com.test.web.ap.action.APActionUtil.getFieldValue(APActionUtil.java:301)
at com.test.web.ap.action.APActionUtil.setFormFieldsToRequest(APActionUtil.java:240)
at

I viewed the section about reflection on FAQ page.

It may cause to get incorrect coverage if use  reflection in code. But the application fails to run now.

 

I know that it can exclude some packages by using the key word 'exclude='com.test.web.*'',

but if I have many those codes in different packages which may lead to miscellaneous conf.

 

I want to exclude those codes that use reflection simply, any suggestion ? Thanks.

 

 

[Marc Hoffmann]

From the FAQ (http://www.eclemma.org/jacoco/trunk/doc/faq.html):

Q: My code uses reflection. Why does it fail when I execute it with
JaCoCo?

A: To collect execution data JaCoCo instruments the classes under test
which adds two members to the classes: A private static field
$jacocoData and a private static method $jacocoInit(). Both members are
marked as synthetic. Please change your code to ignore synthetic
members. This is a good practice anyways as also the Java compiler
creates synthetic members in certain situation.


So in your particular case you will probably add the following check:

if (!fie.isSynthetic()) {

Object fvalue = getFieldValue(fie, vo);
request.setAttribute(fie.getName(), fvalue);
}

Regards,
-marc

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