小编mft*_*mft的帖子

我的页面中有一个selectonemenu,我从我的支持bean获取其内容.但是selectonemenu的内容没有排序.这是代码......

    <p:selectOneMenu id="Department" value="#{search.selectedDepartment}">  
            <f:selectItem itemLabel="Select Department" itemValue="" />  
            <f:selectItems value="#{search.departments}" />  

        </p:selectOneMenu> 

和我的豆...

public class SearchBean implements Serializable {

private Map<String, Map<String, String>> courseData = new HashMap<String, Map<String, String>>();

private Map<String, String> departments = new HashMap<String, String>();
private String selectedDepartment;


    departments.put("department1",
            "department1");
    departments.put("department2",
            "department2");
    departments.put("department3", "department3");
departments.put("department4", "department4");
departments.put("department5", "department5");





//getters setters...


}

selectonemenu的内容分别不是department1,department2,department3,department4,department5.它没有排序.

我的问题是一个简单的nullpointerexception但是,我不明白我怎么弄清楚.这是代码.

我正在尝试运行primefaces的chat utilitie.我正在使用tomcat 7 ..据我所知,但现在我遇到了这个问题.

public class ChatView {

private final PushContext pushContext = PushContextFactory.getDefault().getPushContext();

private ChatUsers users;

    private String privateMessage;

private String globalMessage;

    private String username;

    private boolean loggedIn;

private String privateUser;

private final static String CHANNEL = "/chat/";

public void setUsers(ChatUsers users) {
    this.users = users;
}

public String getPrivateUser() {
    return privateUser;
}

public void setPrivateUser(String privateUser) {
    this.privateUser = privateUser;
}

public String getGlobalMessage() {
    return globalMessage;
}

public void setGlobalMessage(String globalMessage) {
    this.globalMessage = globalMessage; …