I'm using PrimeFace4.0, JSF 2.2, Java, and XHTML. I have a string value that I need to pass from one bean to another. The value is selected on one XHTML page and when the user clicks to select, a new web page is launched. I can see from my server output that the value is successfully collected by the first bean (TestSelectBean), but I can't seem to get it into the next bean (TargetBeanFranz). When a String is hard coded into the bean, it works correctly. However, when I try to use the managed property to call it as per the user input, I get a NullPointer at the line of code (85) where I'm trying to use it.
The first HTML: testselect.xhtml
//irrelevant code
<p:layoutUnit position="center">
<h:form>
<p:selectOneRadio id="Test" value="#{testSelectBean.selectedNameOfExperiments}" >
<f:selectItems id="selectedNameOfExperiments" value="#{testSelectBean.nameofexperiments}" var="entry" itemValue="#{entry.key}" itemLabel="#{entry.value}" />
</p:selectOneRadio>
<p:commandLink id="nonAjax" action="open" actionListener="#{testSelectBean.getParameters}" style="margin-right:20px;" ajax="false">
<h:outputText value="Submit" />
</p:commandLink>
</h:form>
</p:layoutUnit>
The user chosen selectedNameOfExperiments is succsefully passed to TestSelectBean:
@ManagedBean(name = "testSelectBean", eager = true)
@SessionScoped
public class TestSelectBean implements Serializable {
private static final long serialVersionUID = 1L;
protected String selectedNameOfExperiments;
private final Map<String, String> nameofexperiments;
private transient String selected;
public TestSelectBean() throws SQLException {
selected = new String();
nameofexperiments = new HashMap<String, String>();
XYexpdataServiceAdapter xydata = new XYexpdataServiceAdapterImpl();
List<String> dbnameofexperiments = xydata.getNameofexperiments();
for (String ta : dbnameofexperiments) {
nameofexperiments.put(ta, ta);
}
}
public String getSelectedNameOfExperiments() {
return selectedNameOfExperiments;
}
public void setSelectedNameOfExperiments(String selectedNameOfExperiments1) {
this.selectedNameOfExperiments = selectedNameOfExperiments1;
}
public Map<String, String> getNameofexperiments() {
return nameofexperiments;
}
public void getParameters() {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("You've selected Experiment:" + selectedNameOfExperiments));
System.out.println("You've selected Experiment:" + selectedNameOfExperiments);
}
}
However, the XHTML FranzwPopup will not launch unless Experiment is hard coded into TargetBeanFranz.
//irrelevant code
<p:layoutUnit position="center">
<p:panelGrid columns="2" style=" font-size: 14">
<h:outputLabel value="Description" style="font-size: 20"/>
<h:outputText value="Neutron-induced production of protons, deuterons and tritons in Copper and Bismuth."/>
<h:outputLabel value="Reference" style="font-size: 20"/>
<h:outputText value="Nuclear Physics A510 (1990) 774-802 (Franz, et. al.)"/>
</p:panelGrid>
<form action="http://localhost:8080/primefaces/faces/handle.xhtml" method="get" name="login" onsubmit="process();
return false;" style="overflow-y: scroll">
Click to display chart data in a table.<br />
<input type="submit" value="Display"/>
</form>
<h:form>
<h:panelGrid columns="4" cellpadding="5">
<p:selectCheckboxMenu id="menu1" value="#{targetBeantFranz.selectedTargets}" label="Targets" filter="true" filterMatchMode="startsWith"
panelStyle="width:220px">
<f:selectItems value="#{targetBeantFranz.targets}" />
</p:selectCheckboxMenu>
<p:selectCheckboxMenu id="menu2" value="#{targetBeantFranz.selectedSecondaries}" label="Secondaries" filter="true" filterMatchMode="startsWith"
panelStyle="width:220px">
<f:selectItems value="#{targetBeantFranz.secondaries}" />
</p:selectCheckboxMenu>
<p:selectCheckboxMenu id="menu3" value="#{targetBeantFranz.selectedReactions}" label="Reactions" filter="true" filterMatchMode="startsWith"
panelStyle="width:220px">
<f:selectItems value="#{targetBeantFranz.reactions}" />
</p:selectCheckboxMenu>
<p:selectCheckboxMenu id="menu4" value="#{targetBeantFranz.selectedBeamEnergies}" label="Beam Energy" filter="true" filterMatchMode="startsWith"
panelStyle="width:220px">
<f:selectItems value="#{targetBeantFranz.beamenergies}" />
</p:selectCheckboxMenu>
</h:panelGrid>
<p:panel header="Resulting Plots">
<p:commandLink id="nonAjax" actionListener="#{targetBeantFranz.getParameters}" style="margin-right:20px;" ajax="false">
<button id="change">Submit Query</button>
</p:commandLink>
<div id="container" style="min-width: 310px; margin: 0 auto"></div>
</p:panel>
</h:form>
</p:layoutUnit>
//more irrelevant
Instead, I get a NPE on line 85 of TargetBeanFranz where I try to initialize Experiment.
//stuff
@ManagedBean(name = "targetBeantFranz", eager = true)
@SessionScoped
public class TargetBeanFranz implements Serializable {
@ManagedProperty(value="#{testSelectBean}")
private TestSelectBean testSelectBean;
public TestSelectBean getTestSelectBean(){
return testSelectBean;
}
public void setTestSelectBean (TestSelectBean testSelectBean) {
this.testSelectBean = testSelectBean;
}
private static final long serialVersionUID = 1L;
private String Experiment;
//more stuff
public TargetBeanFranz() throws SQLException {
targets = new HashMap<String, String>();
selectedTargets = new ArrayList<String>();
secondaries = new HashMap<String, String>();
selectedSecondaries = new ArrayList<String>();
reactions = new HashMap<String, String>();
selectedReactions = new ArrayList<String>();
beamenergies = new HashMap<String, String>();
selectedBeamEnergies = new ArrayList<String>();
seriesDataArray = new ArrayList<String>();
seriesDataArArray = new ArrayList<ArrayList<String>>();
seriesNameArray = new ArrayList<String>();
seriesToolTipArray = new ArrayList<String>();
seriesErrorArray = new ArrayList<String>();
seriesErrorArArray = new ArrayList<ArrayList<String>>();
allselected = new ArrayList<XYexpdata>();
Experiment = testSelectBean.getSelectedNameOfExperiments(); //This is line 85 and where I'm getting the NPE.
XYexpdataServiceAdapter xydata = new XYexpdataServiceAdapterImpl();
List<String> dbtargets = xydata.getTargetNamesbyExperiment(Experiment);
for (String ta : dbtargets) {
targets.put(ta, ta);
}
List<String> dbsecondaries = xydata.getSecondaryNamesbyExperiment(Experiment);
for (String ta : dbsecondaries) {
secondaries.put(ta, ta);
}
List<String> dbreactions = xydata.getReactionNamesbyExperiment(Experiment);
for (String ta : dbreactions) {
reactions.put(ta, ta);
}
List<String> dbbeamenergies = xydata.getBeamEnergybyExperiment(Experiment);
for (String ta : dbbeamenergies) {
beamenergies.put(ta, ta);
}
}
//more code
