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<p>Let say we have a server that manage a library in which you can add a book, find a book and get all the books. The server code will probably look like this:</p>

<table class="wysiwyg-macro" data-macro-name="code" data-macro-parameters="title=BookService.groovy" data-macro-default-parameter="java" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGU6amF2YXx0aXRsZT1Cb29rU2VydmljZS5ncm9vdnl9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
class BookService {

private List allBooks = new ArrayList()

Book findBook(String isbn) {
    for (book in allBooks) {
      if (book.isbn == isbn) return book
    }
    return null
  }

void addBook(Book book) {
    allBooks.add(book)
  }

Book[] getBooks() {
    return (Book[])allBooks.toArray(new Book[allBooks.size()])
  }

}
</pre></td></tr></table>

<p>with the class Book being something like that.</p>

<table class="wysiwyg-macro" data-macro-name="code" data-macro-parameters="title=Book.groovy" data-macro-default-parameter="java" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGU6amF2YXx0aXRsZT1Cb29rLmdyb292eX0&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
class Book {
  String author
  String title
  String isbn
}
</pre></td></tr></table>
<p><br class="atl-forced-newline" />
To ignore the <code>metaClass</code> property a custom type mapping must be defined (for details refer to <a href="http://xfire.codehaus.org/Aegis+Binding">Aegis Binding</a>).</p>
<table class="wysiwyg-macro" data-macro-name="code" data-macro-parameters="title=Book.aegis.xml" data-macro-default-parameter="xml" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGU6eG1sfHRpdGxlPUJvb2suYWVnaXMueG1sfQ&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
&lt;?xml version="1.0" encoding="UTF-8"?>
&lt;mappings xmlns:sample="http://DefaultNamespace">
  &lt;mapping name="sample:Book">
    &lt;property name="metaClass" ignore="true"/>
  &lt;/mapping>
&lt;/mappings>
</pre></td></tr></table>
<p><br class="atl-forced-newline" />
However, if you compile custom data types from Java the bytecode won't contain a <code>metaClass</code> property and, hence, there is no need to define a custom mapping.</p>