Java 我在HandleDisplayable事件中遇到异常。原因：LinkageError

嗨，朋友们，我的方法有点异常。。。 请帮我纠正那样的错误

Exception in handleDisplayableEvent. Reason: LinkageError  source is : com.ui.PreviewPageUI@38f838f8

我的方法的代码在这里，它达到了方法，但之后，它显示了上述异常。。。请参阅代码

private void getPreviewData(final String cat) {
    System.out.println("I am in privew data:"+cat);
    Thread th = new Thread() {
           public void run() {
            try {
                if (cat.equals("VD")) {
                    if (videoHastable == null || videoHastable.isEmpty()) {
                        initializeWaiting();
                        //ParseData parseData = new ParseData();
                       // String url = "http://122.170.122.186/web/papilon1.jsp?phonetype=" + Midlet.PHONE_TYPE + "&cat=VD";
                        //videoHastable = parseData.connectAndPTheUrl(url);
                        ParseUrl parsedata=new ParseUrl();
                        json=new JSONObject();
                        try {
                            json.put("phonetype",Midlet.PHONE_TYPE);
                            json.put("cat","VD");
                        } catch (JSONException ex) {
                            System.out.println("jsException:"+ex.toString());
                        }
                        String url="http://localhost:8084/MagicWeb/pappilon1?json="+json.toString();

                        videoHastable =parsedata.coonectHttp(url,cat);
                        circularLoading = false;
                    }
                    if (videoHastable != null) {
                        Midlet.display.setCurrent(new WallPapersCanvas(2, "VIDEOS", videoHastable));
                    } else {
                        initializeError("MESSAGE", "COULD NOT POPULATE DATA FROM THE SERVER", MAIN_CATEGORIES);
                    }
                } else if (cat.equals("WP")) {
                    System.out.println("I am in wallpaper");
                    if (wallHastable == null || wallHastable.isEmpty()) {
                        initializeWaiting();
                        /*ParseData parseData = new ParseData();
                        String url = "http://122.170.122.186/web/papilon1.jsp?phonetype=" + Midlet.PHONE_TYPE + "&cat=WP";
                        wallHastable = parseData.connectAndPTheUrl(url);*/
                        ParseUrl parsedata=new ParseUrl();
                        json=new JSONObject();
                        try {
                            json.put("phonetype",Midlet.PHONE_TYPE);
                            json.put("cat","WP");
                        }catch(JSONException e){
                            System.out.println("json excep:"+e.toString());
                        }catch(Exception e){
                            System.out.println("error in wp getpriview:"+e.toString());
                        }
                        String url="http://localhost:8084/MagicWeb/pappilon1?json="+json.toString();
                        System.out.println("I am in wallpaper getpreiview");
                        wallHastable =parsedata.coonectHttp(url,cat);
                        circularLoading = false;
                    }
                    if (wallHastable != null) {
                        Midlet.display.setCurrent(new WallPapersCanvas(2, "WALLPAPERS", wallHastable));
                    } else {
                        initializeError("MESSAGE", "COULD NOT POPULATE DATA FROM THE SERVER", MAIN_CATEGORIES);
                    }
                } else if (cat.equals("GM")) {
                    if (gamesHastable == null || gamesHastable.isEmpty()) {
                        initializeWaiting();
                        /*ParseData parseData = new ParseData();
                        String url = "http://122.170.122.186/web/papilon1.jsp?phonetype=" + Midlet.PHONE_TYPE + "&cat=GM";
                        gamesHastable = parseData.connectAndPTheUrl(url);*/
                        ParseUrl parsedata=new ParseUrl();
                        json=new JSONObject();
                        try {
                            json.put("phonetype",Midlet.PHONE_TYPE);
                            json.put("cat","GM");
                        } catch (JSONException ex) {
                            System.out.println(ex.toString());
                        }
                        String url="http://localhost:8084/MagicWeb/pappilon1?json="+json.toString();
                        gamesHastable =parsedata.coonectHttp(url,cat);
                        circularLoading = false;
                    }
                    if (gamesHastable != null) {
                        Midlet.display.setCurrent(new WallPapersCanvas(2, "GAMES", gamesHastable));
                    } else {
                        initializeError("MESSAGE", "COULD NOT POPULATE DATA FROM THE SERVER", MAIN_CATEGORIES);
                    }
                } else if (cat.equals("TH")) {
                    if (themesHastable == null || themesHastable.isEmpty()) {
                        initializeWaiting();
                        /*ParseData parseData = new ParseData();
                        String url = "http://122.170.122.186/web/papilon1.jsp?phonetype=" + Midlet.PHONE_TYPE + "&cat=TH";
                        themesHastable = parseData.connectAndPTheUrl(url);*/
                        ParseUrl parsedata=new ParseUrl();
                        json=new JSONObject();
                        try {
                            json.put("phonetype",Midlet.PHONE_TYPE);
                            json.put("cat","TH");
                        } catch (JSONException ex) {
                            System.out.println(ex.toString());
                        }
                        String url="http://localhost:8084/MagicWeb/pappilon1?json="+json.toString();
                        themesHastable =parsedata.coonectHttp(url,cat);
                        circularLoading = false;
                    }
                    if (themesHastable != null) {
                        Midlet.display.setCurrent(new WallPapersCanvas(2, "THEMES", themesHastable));
                    } else {
                        initializeError("MESSAGE", "COULD NOT POPULATE DATA FROM THE SERVER", MAIN_CATEGORIES);
                    }
                } else if (cat.equals("AN")) {
                    if (animateHastable == null || animateHastable.isEmpty()) {
                        initializeWaiting();
                        /*ParseData parseData = new ParseData();
                        String url = "http://122.170.122.186/web/papilon1.jsp?phonetype=" + Midlet.PHONE_TYPE + "&cat=AN";
                        animateHastable = parseData.connectAndPTheUrl(url);*/
                        ParseUrl parsedata=new ParseUrl();
                        json=new JSONObject();
                        try {
                            json.put("phonetype",Midlet.PHONE_TYPE);
                            json.put("cat","AN");
                        } catch (JSONException ex) {
                            System.out.println(ex.toString());
                        }
                        String url="http://localhost:8084/MagicWeb/pappilon1?json="+json.toString();
                        animateHastable =parsedata.coonectHttp(url,cat);
                        circularLoading = false;
                    }
                    if (animateHastable != null) {
                        Midlet.display.setCurrent(new WallPapersCanvas(2, "ANIMATIONS", animateHastable));
                    } else {
                        initializeError("MESSAGE", "COULD NOT POPULATE DATA FROM THE SERVER", MAIN_CATEGORIES);
                    }
                } else if (cat.equals("FS")) {
                    if (freeHastable == null || freeHastable.isEmpty()) {
                        initializeWaiting();
                        /*ParseData parseData = new ParseData();
                        String url = "http://122.170.122.186/disney/papilonfree.jsp?phonetype=" + Midlet.PHONE_TYPE;
                        freeHastable = parseData.connectAndPTheUrl(url);*/
                        ParseUrl parsedata=new ParseUrl();
                        json=new JSONObject();
                        try {
                            json.put("phonetype",Midlet.PHONE_TYPE);
                            json.put("cat","FS");
                        } catch (JSONException ex) {
                            System.out.println(ex.toString());
                        }
                        String url="http://localhost:8084/MagicWeb/pappilon1?json="+json.toString();
                        freeHastable =parsedata.coonectHttp(url,cat);
                        circularLoading = false;
                    }
                    if (freeHastable != null) {
                        Midlet.display.setCurrent(new WallPapersCanvas(2, "FREE GIFTS", freeHastable));
                    } else {
                        initializeError("MESSAGE", "COULD NOT POPULATE DATA FROM THE SERVER", MAIN_CATEGORIES);
                    }
                } else {
                    initializeError("MESSAGE", "CATEGORY NAME DOES NOT EXIST", MAIN_CATEGORIES);
                }
            } catch (Exception e) {
                System.out.println("error @ getPreviewData");
                e.printStackTrace();
            }
        }
    };
    System.out.println("Thread not started");
    try{
        th.start();
    }
    catch(Exception e){
        System.out.println("thread th:"+e.toString());
    }
}

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请帮助我，谢谢……

查看LinkageError的描述：

LinkageError的子类表示一个类对另一个类有依赖性；然而，后一个类在编译前一个类之后发生了不兼容的变化

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你的一个班出了点事。可能您需要重新编译或重新编译它们。

首先，请打印整个异常堆栈跟踪（使用

ex.printStackTrace（）

，而不仅仅是

toString（）

result.其次，这与Javadoc有什么关系？您在这里使用的是哪些框架？我使用了Netbean&S60 Emulator，它到达这一行之后，它得到了一个错误System.out.println（“我在privew data:+cat中”）；我重新编译了所有文件，但没有得到解决方案，但谁定义了

com.ui.PreviewPage

？这就是给您带来问题的类。