Java snippet to print all member variables of a class.

DebugUtil.java

public class DebugUtil {

    private DebugUtil() {}
  
    /**
     * Debug method to print all member variables
     * @param obj
     */
    public static void printMembers(Object obj) {
        printMembers(obj, "");
    }

    /**
    * Print members recursively using reflection.
    * This uses Timber (https://github.com/JakeWharton/timber)
    */
    private static void printMembers(Object obj, String indent) {
        Timber.d("%s%s", indent, obj.getClass().getSimpleName());
        
        Class currentClass = obj.getClass();
        final ArrayList<Field> declaredFields = new ArrayList<>();
        // Declared fields do not contain super class fields, so we must climb up the hierarchy
        while (currentClass != Object.class) {
            for (Field field : currentClass.getDeclaredFields()) {
                declaredFields.add(field);
            }
            currentClass = currentClass.getSuperclass();
        }

        for (final Field field : declaredFields) {
            boolean accessible = field.isAccessible();
            field.setAccessible(true);
            
            if (field.getType().isPrimitive() || field.getType() == String.class) {
                try {
                    Timber.d("%s\t%s: %s", indent, field.getName(), field.get(obj));
                } catch (IllegalAccessException e) {
                    Timber.e(e, "Failed to read field %s: %s", field.getName(), e.getMessage());
                }
            } else {
                try {
                    printMembers(field.get(obj), indent + "\t");
                } catch (IllegalAccessException e) {
                    Timber.e(e, "Failed to print members in field %s: %s", field.getName(), e.getMessage());
                }
            }

            field.setAccessible(accessible);
        }

    }
}