JSF 2.0 command button generates NullPointerException

I'm using primefaces 2.2.1 with JSF 2.0. I have a page with various labels to display data, some listboxes and a couple of commandButtons. No matter what I do, whenever I click on a command button in this page, I get the following error:

java.lang.NullPointerException
    at org.primefaces.component.inputmask.InputMaskRenderer.getConvertedValue(InputMaskRenderer.java:115)
    at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1030)
    at javax.faces.component.UIInput.validate(UIInput.java:960)
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1233)
    at javax.faces.component.UIInput.processValidators(UIInput.java:698)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
    at javax.faces.component.UIForm.processValidators(UIForm.java:253)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1172)
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:409)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
    at com.sun.grizzly.http.开发者_运维百科ProcessorTask.process(ProcessorTask.java:1013)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:619)

I have no idea why. Anyone has an idea of what might be causing this? I am also using entity classes and a managed bean for this page. This is part of the JSF Page: The error occurs whenever a command button is clicked.

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/   xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.prime.com.tr/ui"
      xmlns:ui="http://java.sun.com/jsf/facelets">

    <f:view>
        <h:head>
            <link rel="stylesheet" type="text/css" href="../resources/css/masterpage.css" />
            <link rel="stylesheet" type="text/css" href="../resources/css/requests.css" />
        </h:head>
        <h:body>
            <h:form prependId="false" >
                <p:growl id="messages" showDetail="true"/>
                <p:panel id="pnlMain" widgetVar="pnlMain" style="width: 100%; font-size: 15px; text-align: left" header="Request Detail">
               .
               .
               .
                    <table>
                        <tr>
                            <td valign="top">

                            </td>
                            <td align="right">
                                <p:commandButton id="btnViewComment" widgetVar="btnViewComment" ajax="false" value="View Selected" />
                            </td>
                            <td>

                            </td>
                        </tr>
                    </table>
                    <p:panel id="pnlSupportingDocs" widgetVar="pnlSupportingDocs" header="Supporting Documents" >
                        <div>
                            <table>
                                <tr>
                                    <td valign="top" >
                                        <h:selectOneListbox id="lstDocs" style="width: 300px; height: 100px" value="#{MyDocuments.doId}" >
                                            <f:selectItems value="#{RequestSearch.selectedRequest.documentCollection}" var="d" itemLabel="#{d.doName}" itemValue="#{d.doId}" />
                                        </h:selectOneListbox>
                                    </td>
                                    <td valign="bottom" >
                                        <table>
                                            <tr>
                                                <td>
                                                    <p:commandButton id="btnViewSelected" style="font-size: 8px; width: 150px" widgetVar="btnViewSelected" value="View Selected" />
                                                </td>
                                            </tr>
                                            <tr>
                                                <td>
                                                    <p:commandButton id="btnRemoveSelected" style="font-size: 8px; width: 150px" widgetVar="btnRemoveSelected" value="Remove Selected" />
                                                </td>
                                            </tr>
                                            <tr>
                                                <td>
                                                    <p:fileUpload id="btnNewDoc" widgetVar="btnNewDoc" update="messages" allowTypes="*.*" description="All Files" fileUploadListener="#{MyDocuments.handleFileUpload}" />
                                                </td>
                                            </tr>
                                        </table>
                                    </td>
                                </tr>
                            </table>
                        </div>
                    </p:panel>
                    <p:panel id="pnlFinalization" widgetVar="pnlFinalization" header="Final Evaluation" >
                        <table>
                            <tr>
                                <td valign="top" >
                                    <h:outputLabel id="lblComments" style="font-size: 12px" value="Comments:" />
                                </td>
                                <td>
                                    <p:inputTextarea id="txtComments" widgetVar="txtComments" style="width: 300px" maxHeight="600" />
                                </td>
                            </tr>
                        </table>
                        <table>
                            <tr>
                                <td>
                                    <h:outputLabel id="lblFinalAdjAmt" style="font-size: 12px" value="Final Adjustment Amt:" />
                                </td>
                                <td>
                                    <p:inputMask id="txtFinalAdjAmt" widgetVar="txtFinalAdjAmt" mask="$9999999.99" style="width: 100px; text-align: right" maxlength="15" />
                                </td>
                                <td width="100px" >

                                </td>
                                <td>
                                    <h:outputLabel id="lblFinalStatus" style="font-size: 12px" value="Final Status:" />
                                </td>
                                <td>
                                    <h:selectOneMenu id="cmbStatus" value="#{theStatus.reqStatus}" >
                                        <f:selectItems value="#{theStatus.finalStatus}" />
                                    </h:selectOneMenu>
                                </td>
                                <td>
                                    <p:commandButton id="btnSave" widgetVar="btnSave" value="Save" />
                                </td>
                            </tr>
                        </table>
                    </p:panel>
                </p:panel>
                <p:dialog header="Print Forms" id="pf" widgetVar="pf" modal="true" width="450" height="300">  
                    <iframe src="../PopUpPages/FormMenu.jsf" width="400" height="250" />
                </p:dialog>
                <p:dialog header="Comment Detail" id="cd" widgetVar="cd" modal="true" width="450" height="300" >

                </p:dialog>
                <p:dialog header="Supporting Documents" id="sd" widgetVar="sd" modal="true" width="600" height="800" >
                    <iframe src="../PopUpPages/SupportingDoc.jsf" width="590" height="650" scrolling="true" />
                </p:dialog>
            </h:form>
        </h:body>
    </f:view>
</html>

Your <p:inputMask> has no value attribute:

<p:inputMask id="txtFinalAdjAmt" widgetVar="txtFinalAdjAmt" mask="$9999999.99" style="width: 100px; text-align: right" maxlength="15" />

Add this attribute and it should work.