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    <p>As for the empty string, I suppose the problem is that your <strong>0</strong> is casted to <em>Integer</em>, not <em>Double</em> so you have to use postfix <em>d</em> : <strong>0.0d</strong>;</p> <p>As for NumberFormatException, I don't see any problem that converter could not convert it. If you want to have a custom message for convertion errors you should put that message to your message properties file following the semantics of <a href="http://static.springsource.org/spring/docs/2.5.x/api/org/springframework/validation/DefaultMessageCodesResolver.html" rel="nofollow">DefaultMessageCodeResolver</a> I think it will be something like <code>typeMismatch.java.lang.Double = "invalid floating point number"</code> and have a message source in your bean configuration </p> <pre><code> &lt;bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"&gt; &lt;property name="basenames"&gt; &lt;list&gt; &lt;value&gt;exceptions&lt;/value&gt;&lt;!--- that means you have exceptions.properties in your class path with the typeMismatch string specified above--&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>Also the concept of Property Editors is outdated now, the <a href="http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/validation.html#core-convert" rel="nofollow">new API with converters</a> is the way to go, because spring does not create a heap of helper objects(property editors) for any property being edited with this approach.</p>
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