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    <p>I made a few changes and it worked. Not sure, which one is the solution.</p> <p>1) Changed all the ' to ".</p> <p>2) Datatable's <code>value="#{indexBean.procStatus}"</code> is wrong i think. I changed it to the name of the ArrayList inside the class. So, it became <code>value="#{indexBean.procStatus.mylist}"</code></p> <p>3) Added an ajax listener, like the one you mentioned in the question. <code>&lt;p:ajax event="rowSelectCheckbox" listener="#{indexBean.check}" /&gt;</code>.</p> <p>4) Added <code>pid</code> to the constructor which will be our rowKey.</p> <p>5) Now, the poll prints the array.</p> <p>Resultin xhtml is as follows:</p> <pre><code>&lt;h:head&gt; &lt;title&gt;System Monitor&lt;/title&gt; &lt;/h:head&gt; &lt;h:body&gt; &lt;h:form&gt; &lt;p:poll interval="1" listener="#{indexBean.printSelect()}"/&gt; &lt;/h:form&gt; &lt;h:form&gt; &lt;p:dataTable id="data" var="proc" value="#{indexBean.procStatus.mylist}" rowKey="#{proc.pid}" selection="#{indexBean.selectedProcs}"&gt; &lt;p:ajax event="rowSelectCheckbox" listener="#{indexBean.check}" /&gt; &lt;p:column&gt; &lt;f:facet name="header"&gt; &lt;h:outputText value="Process Name"/&gt; &lt;/f:facet&gt; &lt;h:outputText styleClass="outputCell" id="pname" value="#{proc.name}"/&gt; &lt;/p:column&gt; &lt;p:column selectionMode="multiple"/&gt; &lt;/p:dataTable&gt; &lt;/h:form&gt; &lt;/h:body&gt; &lt;/ui:composition&gt; </code></pre> <p>Bean:</p> <pre><code>@ManagedBean(name = "indexBean") @ViewScoped public class indexBean implements Serializable { private ProcStatDataModel procStatus; private SingleProcess[] selectedProcs; @PostConstruct public void loadProcStat() { List&lt;SingleProcess&gt; temp = new ArrayList&lt;SingleProcess&gt;(); temp.add(new SingleProcess("test1",1)); temp.add(new SingleProcess("test2",2)); temp.add(new SingleProcess("test3",3)); procStatus = new ProcStatDataModel(temp); } public void printSelect() { if (selectedProcs != null) { String str = ""; for (SingleProcess sp : selectedProcs) { str += sp.getName() + "_"; } System.out.print(str); } else { System.out.println("selectedProcs is null"); } } public ProcStatDataModel getProcStatus() { return procStatus; } public SingleProcess[] getSelectedProcs() { return selectedProcs; } public void setSelectedProcs(SingleProcess[] selectedProcs) { this.selectedProcs = selectedProcs; } public void check(SelectEvent event) { System.out.println("in check"); } } </code></pre>
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    1. COI did what you said in 3 & 4(Because I don't understand what do you mean in 1 and 2) and it fix the problem. However, when it comes to my project (which is more complex), the checkbox send the information several seconds(even minutes) after I click the checkbox. I am wondering if this is about performance? But the polling still invoked during this time(send back time), so I don't know if there's something wrong...
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    2. COCan you check where the problem is for me? I have no idea why it doesn't work and I am going crazy.. https://drive.google.com/file/d/0B5ye4CP3K_a3aTdDblJJei1IeHc/edit?usp=sharing
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    3. COSorry for the wrong file above, here's the right one: https://drive.google.com/file/d/0B5ye4CP3K_a3cTZFV3l2SHhYTGc/edit?usp=sharing
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

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