Primefaces 自动补全器中的NullPointerException

我使用下一个Java API以编程方式创建自动完成组件：

public class AutoCompleteHandler extends UIComponentHandler<AutoComplete> {
@Override
public AutoComplete handle(AutoComplete component, Map<String, String> attributes) {
    FacesContext ctx = FacesContext.getCurrentInstance();
    Application application = ctx.getApplication();

    component.setId(attributes.get(InspectionResultConstants.NAME));

    String elExpression = FacesUtils.wrapExpression("addressFinder.getAddressList");
    MethodExpression methodExpression = application.getExpressionFactory().createMethodExpression(ctx.getELContext(), elExpression, List.class, new Class<?>[]{String.class});
    component.setCompleteMethod(methodExpression);

    return component;
}

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我不确定你和我是否有同样的问题。当我的bean被ViewScoped注释时，我得到了NullPointerException。在我更改为RequestScope后，一切似乎都正常。我在使用update=“@form”时在p:autocomplete中遇到了相同的异常，然后我更改为update=“componentA componentB”并再次工作。希望能有帮助。

    @Named
    @ViewScoped
    public class AddressFinder implements Serializable {
    private String addressValue;
    private ArrayList<String> selections = new ArrayList<>();
    private String uIComponentName;

    public String getAddressValue() {
        return addressValue;
    }

    public void setAddressValue(String addressValue) {
        this.addressValue = addressValue;
    }

    public void setUIComponentName(String name) {
        this.uIComponentName = name;
    }

    public List<String> getAddressList(String searchStr) throws SQLException {
        AddressFinderUtils.recalculateSelections(selections, searchStr);
        Client client = AddressFinderUtils.getClient();
        int phase = selections.size();
        String idexName = AddressFinderUtils.getESIndexNameBySearchPhase(phase, this.uIComponentName);
        if (StringUtils.isEmpty(idexName)) return null;
        String typeName = AddressFinderUtils.getESTypeNameBySearchPhase(phase, this.uIComponentName);
        String esQuery = AddressFinderUtils.getQueryBySearchPashe(phase, selections,  searchStr, this.uIComponentName);


        SearchResponse response = client.prepareSearch(idexName)
                .setTypes(typeName)
                .setExtraSource(esQuery)
                .setFetchSource(true).setFrom(0).setSize(10)
                .execute()
                .actionGet();

        String ESSourceFieldName = AddressFinderUtils.getESSorceFieldNameBySearchPhase(phase, this.uIComponentName);
        if (ESSourceFieldName == null) return null;

        List<String> results = new ArrayList<>();
        String resStr;
        for (SearchHit searchHit : response.getHits()) {
            resStr = searchHit.sourceAsMap().get(ESSourceFieldName).toString();
            results.add(resStr);
        }

        return results;
    }

    public void onItemSelect(SelectEvent event) {
        selections.add(event.getObject().toString());
    }
}

Primefaces version is 5.2