Display 类中捕获异常

Question

嘿嘿朋友们我的代码出错了。我的项目编译成功&从一开始就运行良好，但是当我触发移动中键时，它会显示这样的错误......

TRACE: <at java.lang.Error: ClassFormatError:  56>, Exception caught in Display class
java.lang.Error: ClassFormatError:  56
        at java.lang.Class.invoke_verify(), bci=0
        at java.lang.Class.initialize(), bci=117
        at com.ui.PreviewPageUI.getPreviewData(), bci=0
        at com.ui.PreviewPageUI.keyPressedMainCatFire(), bci=54
        at com.ui.PreviewPageUI.keyPressedFire(PreviewPageUI.java:451)
        at com.ui.PreviewPageUI.keyPressed(PreviewPageUI.java:284)
        at javax.microedition.lcdui.CanvasLFImpl.uCallKeyPressed(), bci=19
        at javax.microedition.lcdui.DisplayableLFImpl.uCallKeyEvent(), bci=146
        at javax.microedition.lcdui.Display$DisplayEventConsumerImpl.handleKeyEvent(), bci=30
        at com.sun.midp.lcdui.DisplayEventListener.process(), bci=277
        at com.sun.midp.events.EventQueue.run(), bci=179
        at java.lang.Thread.run(Thread.java:662)

请帮助我如何删除此错误......谢谢 这是我的功能代码

private void getPreviewData(final String cat) {
        Thread th = new Thread() {

            public void run() {
                try {
                    if (cat.equals("VD")) {
                        if (videoHastable == null || videoHastable.isEmpty()) {
                            initializeWaiting();
                            ParseUrl parsedata=new ParseUrl();
                            json=new JSONObject();
                            try {
                                json.put("phonetype",Midlet.PHONE_TYPE);
                                json.put("cat","VD");
                            } catch (JSONException ex) {
                                System.out.println(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")) {
                        if (wallHastable == null || wallHastable.isEmpty()) {
                            initializeWaiting();

                            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();

                            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();

                            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();

                            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();

                            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();
                }
            }
        };
        th.start();
    }

Answer 1

当 Java 虚拟机尝试读取类文件并确定该文件格式错误或无法解释为类文件时抛出。

链接
...您可以输入您的代码吗？