Failed to parse the expression [#{privilegeManagedBean.deleteAction(p)}] - jsf

Question

I want to delete selected row from data table when click on GraphicImage under CommandLink.
but it is don't work for me.
it gives error :-
/privilegepage.xhtml #66,21 action="#{privilegeManagedBean.deleteAction(p)}" Failed to parse the expression [#{privilegeManagedBean.deleteAction(p)}]
Bean:-Privilege
public class Privilege {
private int id;
private String privilege;
public Privilege() {
}
public Privilege(int id, String privilege) {
this.id = id;
this.privilege = privilege;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPrivilege() {
return privilege;
}
public void setPrivilege(String privilege) {
this.privilege = privilege;
}
}
bean:- PrivilegeDao.java
public int deletePrivilege(int id) {
PreparedStatement preparedStatement = null;
String sqlprivilege;
Connection dbConnection = null;
int pinsert = 0;
try {
sqlprivilege = "delete privilege from privilege where id=?";
dbConnection = ConnectionDao.getDBConnection();
preparedStatement = dbConnection.prepareStatement(sqlprivilege);
preparedStatement.setInt(2, id);
if(preparedStatement.executeUpdate()==1)
pinsert=1;
else
pinsert=0;
System.out.println("privilege is delete :- ");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (preparedStatement != null) {
try {
preparedStatement.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dbConnection != null) {
try {
dbConnection.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return pinsert;
}
bean :-PrivilegeManagedBean
#ManagedBean(name = "privilegeManagedBean", eager = true)
#SessionScoped
/* #ManagedProperty(value="#param.id") */
public class PrivilegeManagedBean {
private int id;
private String privilege;
private PrivilegeDao pdao;
#SuppressWarnings("unused")
private List<Privilege> privilegeData;
private static int srno;
private int selectedRowIndex = -1;
public PrivilegeManagedBean() {
privilegeData = new ArrayList<Privilege>();
pdao = new PrivilegeDao();
srno = 0;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPrivilege() {
return privilege;
}
public void setPrivilege(String privilege) {
this.privilege = privilege;
}
public void setPrivilegeData(List<Privilege> privilegeData) {
this.privilegeData = privilegeData;
}
public List<Privilege> getPrivilegeData() {
return this.privilegeData = pdao.getUserList();
}
public int getSelectedRowIndex() {
return selectedRowIndex;
}
public void setSelectedRowIndex(int selectedRowIndex) {
this.selectedRowIndex = selectedRowIndex;
}
public void addDataTableRow() {
pdao.addRow(this.id, this.privilege);
}
private static ArrayList<Privilege> privilegeList = new ArrayList<Privilege>();
public ArrayList<Privilege> getPrivilegeList() {
return privilegeList;
}
public void setPrivilegeList(ArrayList<Privilege> privilege) {
privilegeList = (ArrayList<Privilege>) pdao.getUserList();
}
public int addAction() {
Privilege privilegeitem = new Privilege(this.id, this.privilege);
privilegeList.add(privilegeitem);
return pdao.addPrivilege(this.privilege);
}
public int deleteAction() {
Privilege privilegeitem = new Privilege(this.id, this.privilege);
privilegeList.remove(privilegeitem);
System.out.println("delete Action...");
return pdao.deletePrivilege(this.id);
}
public int onEdit(RowEditEvent event) {
FacesMessage msg = new FacesMessage("Privilege Edited",
((Privilege) event.getObject()).getPrivilege());
FacesContext.getCurrentInstance().addMessage(null, msg);
int pid = pdao.getPrivilegeId(this.privilege);
System.out.println("Privilege Name For Id :- " + this.privilege);
System.out.println("Privilege Id :- " + pid);
return pdao.updatePrivilege(pid, this.privilege);
}
public void onCancel(RowEditEvent event) {
FacesMessage msg = new FacesMessage("Privilege Cancelled");
FacesContext.getCurrentInstance().addMessage(null, msg);
privilegeList.remove((Privilege) event.getObject());
}
public String deletePrivilege(Privilege privilege) {
privilegeList.remove(privilege);
return null;
}
public int getSrno() {
return ++srno;
}
}
Privilege.xhtml
<p:growl id="messages" showDetail="true" />
<p:dataTable value="#{privilegeDao.userList}" var="p"
id="datatbldispprivilege" style="width:500px" editable="true" lazy="true">
<f:facet name="header">
Privilege List
</f:facet>
<p:ajax event="rowEdit" listener="#{privilegeManagedBean.onEdit}"
update=":form1:messages" />
<p:ajax event="rowEditCancel"
listener="#{privilegeManagedBean.onCancel}" update=":form1:messages" />
<p:column headerText="Privileges Name">
<p:cellEditor>
<f:facet name="output">
<p:outputLabel value="#{p.privilege}" name="privilegeoutputname" />
</f:facet>
<f:facet name="input">
<p:inputText value="#{privilegeManagedBean.privilege}"
name="privilegeinputname" />
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Options" style="width:100px">
<p:rowEditor>
</p:rowEditor>
</p:column>
<p:column headerText="Delete" style="width:100px">
<p:commandLink action="#{privilegeManagedBean.deleteAction(p)}"
update="#form">
<p:graphicImage value="/images/deleteicon.png" library="images"
onclick="if (!confirm('Are you sure you want to delete the current record?')) return false"
width="20px" height="20px" />
<f:param name="pname" value="#{p.name}" />
</p:commandLink>
</p:column>
</p:dataTable>

Answer 1

Your PrivilegeManagedBean#deleteAction don't accepts any arguments, but your JSF code passes the current iteration of the data table value to the method. So either don't pass anything to the method:
<p:commandLink action="#{privilegeManagedBean.deleteAction()}" update="#form">
or change the method signature of PrivilegeManagedBean#deleteAction.

Answer 2

you're trying to call the wrong method. action should be like this:
<p:commandLink action="#{privilegeManagedBean.deletePrivilege(p)}" update="#form">