我正在尝试使用
这是我的XHTML文件：
p:datatable 显示之前的搜索结果，并选择一行以在显示对话框上显示（如展示中所示：http://www.primefaces.org/showcase/ui/data/datatable/lazy.xhtml）。但是 ajax 事件 "rowSelect" 的 SelectEvent.getObject() 总是返回 null，当前行永远未被选中。
以下是堆栈跟踪：
Caused by: java.lang.NullPointerException
at com.gestion.projet.web.jsf.ProjetComponentImpl.onRowSelect(ProjetComponentImpl.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy58.onRowSelect(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy10.onRowSelect(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
... 38 more
这是我的XHTML文件：
<p:dataTable var="current" value="#{ProjetComponent.lazyModel}"
paginator="true" rows="10"
paginatorTemplate="{RowsPerPageDropdown} {FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink} {LastPageLink}"
rowsPerPageTemplate="5,10,15" selectionMode="single"
selection="#{ProjetComponent.projet}" id="projetTable" lazy="true">
<p:ajax event="rowSelect" listener="#{ProjetComponent.onRowSelect}"
update=":form:projetDetail" oncomplete="PF('projetDialog').show()" />
<p:column headerText="Id" sortBy="#{current.idprojet}" filterBy="#{current.idprojet}">
<h:outputText value="#{current.idprojet}" />
</p:column>
<p:column headerText="Nom" sortBy="#{current.nomprojet}"
filterBy="#{current.nomprojet}">
<h:outputText value="#{current.nomprojet}" />
</p:column>
</p:dataTable>
这是在ProjetComponent组件中的onRowSelect方法，其中包含第92行：
@Scope("session")
@Component("ProjetComponent")
public class ProjetComponentImpl implements ProjetComponent {
private Projet projet;
@Autowired
private ProjetService projetService;
private LazyDataModel<Projet> lazyModel;
/**
*/
public ProjetComponentImpl() {
}
@PostConstruct
public void init() {
//initialize the data here
this.phases = new Phase();
//similar for other fields
this.utilisateurs =new Utilisateur();
this.projet=new Projet();
this.lazyModel = new LazyProjetDataModel(projetService.findAllProjets(-1, -1));
}
@Transactional
public LazyDataModel<Projet> getLazyModel() {
this.lazyModel = new LazyProjetDataModel(projetService.findAllProjets(-1, -1));
return lazyModel;
}
@Transactional
public void setLazyModel(LazyDataModel<Projet> lazyModel) {
this.lazyModel = lazyModel;
}
@Transactional
public void onRowSelect(SelectEvent event) {
if (event != null){
FacesMessage msg = new FacesMessage("Projet Selected", ((Projet) event.getObject()).getIdprojet().toString());//Line 92
FacesContext.getCurrentInstance().addMessage(null, msg);
} }
}
这是 LazyProjetDataModel：
public class LazyProjetDataModel extends LazyDataModel<Projet> {
private static final long serialVersionUID = 1L;
private List<Projet> datasource;
public LazyProjetDataModel(List<Projet> datasource) {
this.datasource = datasource;
}
@Override
public Projet getRowData(String rowKey) {
for(Projet projet : datasource) {
if(projet.getIdprojet().equals(rowKey))
return projet;
}
return null;
}
@Override
public Object getRowKey(Projet projet) {
return projet.getIdprojet();
}
@Override
public List<Projet> load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String, Object> filters) {
List<Projet> data = new ArrayList<Projet>();
//filter
for(Projet car : datasource) {
boolean match = true;
if (filters != null) {
for (Iterator<String> it = filters.keySet().iterator(); it.hasNext();) {
try {
String filterProperty = it.next();
Object filterValue = filters.get(filterProperty);
String fieldValue = String.valueOf(car.getClass().getField(filterProperty).get(car));
if(filterValue == null || fieldValue.startsWith(filterValue.toString())) {
match = true;
}
else {
match = false;
break;
}
} catch(Exception e) {
match = false;
}
}
}
if(match) {
data.add(car);
}
}
//sort
if(sortField != null) {
// Collections.sort(data, new LazySorter(sortField, sortOrder));
}
//rowCount
int dataSize = data.size();
this.setRowCount(dataSize);
//paginate
if(dataSize > pageSize) {
try {
return data.subList(first, first + pageSize);
}
catch(IndexOutOfBoundsException e) {
return data.subList(first, first + (dataSize % pageSize));
}
}
else {
return data;
}
}
}
这是数据表的截图：
当我选择一行时，我得到的结果如下图所示：
