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POgoing crazy about the spring mvc checkbox
 

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  1. POgoing crazy about the spring mvc checkbox
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    <p>I got the checkbox working, but I can't remember what modification I have done to my code. it's never working again. it keeps saying:</p> <pre><code>org.springframework.web.servlet.tags.form.Checkbox Tag - java.lang.NullPointerException at org.springframework.web.servlet.tags.form.Selected ValueComparator.exhaustiveCompare(SelectedValueCom parator.java:157) </code></pre> <p>the java looks like this:</p> <pre><code>public class ServiceRequest implements Serializable { ...... private GenericAddress serviceAddress; private String problemDescription; private String referenceNumber; private String[] optionExchangeList = new String[10]; ...... </code></pre> <p>the jsp code looks like this:</p> <pre><code>&lt;INPUT TYPE="checkbox" NAME="addPrima" onclick="showHideDiv(this,'exchangeOfOption')"&gt; &lt;spring:message code="serviceRequest.label.ExchangeOfOption"/&gt;&lt;br /&gt; &lt;div id="exchangeOfOption" style="display:none; margin-left : 15px;" &gt; &lt;spring:message code="serviceRequest.label.OnsiteExchangeOfDevice"/&gt; &lt;form:checkbox path="serviceRequest.optionExchangeList" value="Duplex"/&gt;&lt;br /&gt; &lt;spring:message code="serviceRequest.label.Drawer"/&gt; &lt;form:checkbox path="serviceRequest.optionExchangeList" value="Drawer"/&gt;&lt;br /&gt; &lt;spring:message code="serviceRequest.label.Feeder"/&gt; &lt;form:checkbox path="serviceRequest.optionExchangeList" value="Feeder"/&gt;&lt;br /&gt; &lt;spring:message code="serviceRequest.label.MaintenanceKit"/&gt; &lt;form:checkbox path="serviceRequest.optionExchangeList" value="Maintenance Kit"/&gt;&lt;br /&gt; &lt;spring:message code="serviceRequest.label.Other"/&gt; &lt;form:checkbox path="serviceRequest.optionExchangeList" value="Other"/&gt; &lt;/div&gt; </code></pre> <p>it worked before. I even use optionExchangeList.toString() to look at the result. it was the names for the one I checked. (it's impossible huh? should be something like @afaswe) . and for now. I have to initialize the optionExchangeList as something like:</p> <pre><code>private String[] optionExchangeList = new String[]{"Duplex","Drawer"}; </code></pre> <p>and for Duplex and Drawer, they stayed checked in the browser. but for the rest field. they stayed unchecked, and even if I check them, they don't appear in the optionExchangeList if I print them out in the action method using something like:</p> <pre><code>for (String s:serviceRequest.optionExchangeList){ System.out.println(s+"\n"); } </code></pre> <p>the list stayed the same regardless the Checkbox status.</p> <p>Did I just have a dream??? or did I meet a ghost??? I am going crazy. HELP!!!!</p>
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    1. COCould it be blowing up because some of the elements in the array optionExchangeList are null?
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      1. USearldouglas
 

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