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POJSF converter for selectOneMenu
 

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    <p>I want to set a many-to-one relationship in a hibernate entity using <code>selectOneMenu</code>.</p> <pre><code>&lt;h:selectOneMenu value="#{taskBean.instance.currency}" class="form-control" id="currencyList" converter="#{currencyConverterBean}"&gt; &lt;f:selectItems value="#{currencyBean.currencyList}" var="currency" itemLabel="#{currency.name}"/&gt; &lt;/h:selectOneMenu&gt; </code></pre> <p>where <code>#{taskBean.instance}</code> returns a hibernate entity Task:</p> <pre><code>@Entity @Table(name="task") public class Task { //... public Currency currency; @ManyToOne @JoinColumn(name = "currencyID") public Currency getCurrency() { return currency; } //... } </code></pre> <p>If one sets value <code>#{taskBean.instance.currency.id}</code> for selectOneMenu and <code>#{currency.id}"</code> for itemValue it doesn't work. Therefore, I tryed to use a converter:</p> <pre><code>@ManagedBean(name="currencyConverterBean") @FacesConverter(value = "currencyConverter") @RequestScoped public class CurrencyConverter implements Converter { CurrencyBO currencyBO; @Override public Currency getAsObject(FacesContext ctx, UIComponent component, String value) { return getCurrencyBO().getCurrencyById(new Integer(value)); } @Override public String getAsString(FacesContext fc, UIComponent uic, Object o) { return String.valueOf(((Currency) o).getId()); } public CurrencyBO getCurrencyBO() { return currencyBO; } public void setCurrencyBO(CurrencyBO currencyBO) { this.currencyBO = currencyBO; } } </code></pre> <p>It doesn't work. It returns the following error:</p> <pre><code>PWC1406: Servlet.service() for servlet Faces Servlet threw exception java.lang.NullPointerException at com.otv.converter.CurrencyConverter.getAsObject(CurrencyConverter.java:33) </code></pre> <p>What am I doing wrong?</p>
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    1. USPaulo Tomé
    1. USzerg
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    1. COIt seems that the currencyBO is null. You must initialize or inject it. If you want to use @Inject take also a look to http://stackoverflow.com/questions/7531449/cdi-injection-into-a-facesconverter
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      1. USJan Piel
    2. COCurrencyConverter doesn't need to be `ManagedBean` and `FacesConverter` at the same time. Just use `FacesConverter` notation and reference it like `converter="currencyConverterBean"`. Also check that your `getAsString` method is returning object's id and what kind of value is coming in your `getAsObject` method.
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      1. USXtreme Biker
 

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