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POSpring tag <form:option> not working with Spring Data DomainClassConverter?
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2012-09-14T21:08:43.167
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<p>I'm using Spring MVC and Spring Data and also have configured Spring Data's <code>DomainClassConverter</code> to automatically convert String id to the appropriate Domain class.</p> <p>I'm now implementing a Order to Customer reference using the tag using:</p> <pre><code><form:select path="customer"> <form:option value="" label="Select" /> <form:options items="${customers}" itemValue="id" /> </form:select> </code></pre> <p>which results in the given HTML:</p> <pre><code><select id="customer" name="customer" class="span6"> <option value="">Select</option> <option value="1">Customer A</option> <option value="2">Customer B</option> <option value="3">Customer C</option> </select> </code></pre> <p>When submitting a post with e.g. Customer A selected I get a exception like:</p> <pre><code>org.apache.jasper.JasperException: org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.lang.String to type @javax.validation.constraints.NotNull @javax.persistence.ManyToOne nl.kapsalonreflection.domain.Customer for value ''; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: The given id must not be null!; nested exception is java.lang.IllegalArgumentException: The given id must not be null! </code></pre> <p>Which does not make sense at all as the value received should be 1 and not ''. I also debugged the received request params and it only contained customer=1 (as expected)</p> <p>Note that the <code>InvalidDataAccessApiUsageException</code> is coming from Spring Data's <code>DomainClassConverter</code> and if I remove the this converter the problem does not occur anymore.</p> <p>I also debugged the <code>DomainClassConverter</code> and what I can see it tries to cover twice. First with the String value 1 (as expected) but then another call with an empty String, causing the exception.</p> <p>It get's weirder though...</p> <p>When I replace <code><form:option value="" label="Select" /></code> with the plain html element <code><option value="">Select</option></code> then the exception does not occur, and hence only 1 call is made to the convert method with the String 1. The weird part is that both <code><form:option value="" label="Select" /></code> and <code><option value="">Select</option></code> product the same html output...</p> <p>I cannot explain the behaviour... although I seemm to have a 'workaround' with the plain html element I would like to know what is causing the issue.</p>
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<spring><spring-mvc><spring-data><spring-data-jpa>
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Spring tag <form:option> not working with Spring Data DomainClassConverter?
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1. USMarcel Overdijk
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