使用Primefaces自动完成功能时遇到一些问题。首先，我想展示我的xhtml文件。
<?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:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:o="http://openfaces.org/"
xmlns:om="http://omnifaces.org/ui"
xmlns:of="http://omnifaces.org/functions"
xmlns:p="http://primefaces.org/ui" >
<ui:composition template="/Template/basicTemplate.xhtml">
<ui:define name="content">
<h:form> <h1>Firma anlegen</h1>
<h:panelGrid columns="2" cellpadding="5">
<h:outputLabel for="name" value="Name:" style="font-weight:bold" />
<p:inputText id="name" value="#{registerCompanyBean.company.name}" />
<h:outputLabel for="name" value="Straße:" style="font-weight:bold" />
<p:inputText id="street" value="#{registerCompanyBean.postalAddress.street}" />
<h:outputLabel for="name" value="PLZ:" style="font-weight:bold" />
<p:inputText id="zipCode" value="#{registerCompanyBean.postalAddress.zipCode}" />
<h:outputLabel for="name" value="Ort:" style="font-weight:bold" />
<p:inputText id="city" value="#{registerCompanyBean.postalAddress.city}" />
<h:outputLabel for="name" value="Land:" style="font-weight:bold" />
<p:inputText id="country" value="#{registerCompanyBean.postalAddress.country}" />
<p:outputLabel value="Branche:" for="dd" style="font-weight:bold" />
<p:autoComplete id="dd" dropdown="true" value="#{registerCompanyBean.buisnessCategory.name}" completeMethod="#{registerCompanyBean.completeBuisnessCategory}"
var="buisnessCategory" itemLabel="#{buisnessCategory.name}" itemValue="#{buisnessCategory}" converter="buisnessCategoryConverter" forceSelection="true" >
</p:autoComplete>
</h:panelGrid>
<H1>Wartelisten</H1>
<h:panelGrid columns="2" cellpadding="5">
</h:panelGrid>
<p:commandButton id="save" value="Save" action="#{registerCompanyBean.save}" ajax="false"/>
</h:form>
</ui:define>
</ui:composition>
</html>
页面启动没有任何错误。我可以填写输入字段，我可以按预期使用下拉框。我甚至可以使用autoComplete函数但是当我按下CommandButton时，我得到一个NullPointerException。如果我删除commandButton的ajax属性，CommandButton什么也不做（根本没有函数调用）。所以对我来说似乎我必须添加ajax = false属性。 任何想法???
Thx
迈克尔施密特 为了更好地理解，我添加了所有其他文件。转换器：
/**
*
* @author mibschmidt
*/
@FacesConverter("buisnessCategoryConverter")
public class BuisnessCategoryConverter implements Converter{
@Override
public Object getAsObject(FacesContext fc, UIComponent uic, String value) {
if(value != null && value.trim().length() > 0) {
try {
BuisnessCategoryService service = (BuisnessCategoryService) fc.getExternalContext().getApplicationMap().get("buisnessCategoryService");
return service.findAll().get(Integer.parseInt(value));
} catch(NumberFormatException e) {
throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Conversion Error", "Not a valid BuisnessCategory."));
}
}
else {
return null;
}
}
@Override
public String getAsString(FacesContext fc, UIComponent uic, Object object) {
if(object != null) {
return String.valueOf(((BuisnessCategory) object).getID());
}
else {
return null;
}
}
}
ManageBean：
@Controller
@Scope("session")
public class RegisterCompanyBean extends GenericCRUDController<Company, CompanyService> implements Serializable {
@Autowired
private BuisnessCategoryService buisnessCategoryService;
private BuisnessCategory buisnessCategory;
public BuisnessCategoryService getBuisnessCategoryService() {
return buisnessCategoryService;
}
public void setBuisnessCategoryService(BuisnessCategoryService buisnessCategoryService) {
this.buisnessCategoryService = buisnessCategoryService;
}
public BuisnessCategory getBuisnessCategory() {
return buisnessCategory;
}
public void setBuisnessCategory(BuisnessCategory buisnessCategory) {
this.buisnessCategory = buisnessCategory;
}
@Autowired
private PostalAddressService postalAddressService;
private PostalAddress postalAddress =new PostalAddress();
public PostalAddressService getPostalAddressService() {
return postalAddressService;
}
public void setPostalAddressService(PostalAddressService postalAddressService) {
this.postalAddressService = postalAddressService;
}
public Company getCompany() {
return company;
}
public void setCompany(Company company) {
this.company = company;
}
@Autowired
private CompanyService companyService;
private Company company= new Company();
public PostalAddress getPostalAddress() {
return postalAddress;
}
public void setPostalAddress(PostalAddress postalAddress) {
this.postalAddress = postalAddress;
}
public CompanyService getCompanyService() {
return companyService;
}
public void setCompanyService(CompanyService companyService) {
this.companyService = companyService;
}
public List<BuisnessCategory> getBuisnessCategoryList() {
return buisnessCategoryService.findAll();
}
@Override
protected CompanyService getService() {
return companyService;
}
public void saveButtonAction(ActionEvent actionEvent) {
addMessage("Speichern der Firma");
}
@Override
public String save() {
List <PostalAddress> pAL = new ArrayList<>();
pAL.add(postalAddressService.save(postalAddress));
company.setPostalAddress(pAL);
company.setBuisnessCategory(buisnessCategoryService.save(buisnessCategory));
company=companyService.save(company);
if(company==null){
addMessage("Fehler beim Registrieren der Firma");
}else{
addMessage(String.valueOf(company.getID()));
}
return super.save(); //To change body of generated methods, choose Tools | Templates.
}
public List<BuisnessCategory> completeBuisnessCategory(String query) {
List<BuisnessCategory> allBuisnessCategory = buisnessCategoryService.findAll();
List<BuisnessCategory> filteredBuisnessCategory = new ArrayList<>();
for (int i = 0; i < allBuisnessCategory.size(); i++) {
BuisnessCategory bk = allBuisnessCategory.get(i);
if(bk.getName().toLowerCase().contains(query.toLowerCase())) {
filteredBuisnessCategory.add(bk);
}
}
return filteredBuisnessCategory;
}
public void addMessage(String summary) {
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, summary, null);
FacesContext.getCurrentInstance().addMessage(null, message);
}
}
错误讯息：
at com.wedusch.waitlist.jsf.util.BuisnessCategoryConverter.getAsObject(BuisnessCategoryConverter.java:33)
at org.primefaces.component.autocomplete.AutoCompleteRenderer.getConvertedValue(AutoCompleteRenderer.java:604)
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.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:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
答案 0 :(得分：0)
使用前必须使用初始对象（buisnessCategory）（#{registerCompanyBean.buisnessCategory.name}）。
构造函数初始
public RegisterCompanyBean(){
buisnessCategory = new BuisnessCategory();
}
或者@PostConstruct首字母
@PostConstruct
public void init(){
buisnessCategory = new BuisnessCategory();
}