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With the default BeanAccessMode, a bean's fields are not inspected. However, if you specify a different BeanAccessMode, the fields are accessible as part of the bean's properties. See Example 7.6, “Possible BeanAccessMode Definitions�, Example 7.7, “Setting the BeanAccessMode�, and Example 7.8, “The FieldsBean Class� for an implementation. Example 7.6. Possible BeanAccessMode Definitions public enum BeanAccessMode { STANDARD(BeanInfoCreator.STANDARD), // Getters and Setters FIELDS(BeanInfoCreator.FIELDS), // Getters/Setters and fields without getters and setters ALL(BeanInfoCreator.ALL); // As above but with non public fields included } Here, a String value is set to a private String field: Example 7.7. Setting the BeanAccessMode InternalString Example 7.8. The FieldsBean Class public class FieldsBean { private String string; public void start() { if (string == null) throw new IllegalArgumentException("Strings should be set!"); } }