Java me j2me中的NoClassDefFoundError
我已经构建了一个jar文件,并试图在j2me应用程序中使用它。我已经将jar包含在构建路径中,并导入了所需的类。但是当我运行我的j2me应用程序时,我在尝试实例化jar中存在的类的行中得到NoClassDefFound错误 我可以在java项目中实例化jar类,但不能在j2me中实例化 以下是错误日志: 警告-MMA- C:/Builds/jme-sdk/javacall-javame-sdk-305/implementation/share/jsr135_mmapi/ju_mmconfig.C 第801行:大写:缺少可选设置:SuspendBehavior java.lang.NoClassDefFoundError:com/canvasm/ida/gps/LocationUpdater -HelloIDA.com.test.ida.HelloIDA.(HelloIDA.java:11) -java.lang.Class.newInstance(),bci=0 -com.sun.midp.main.CldcMIDletLoader.newInstance(),bci=46 -com.sun.midp.midlet.MIDletStateHandler.createMIDlet(),bci=66 -com.sun.midp.midlet.MIDletStateHandler.createAndRegisterMIDlet(),bci=17 -com.sun.midp.midlet.MIDletStateHandler.startSuite(),bci=27 -com.sun.midp.main.AbstractMidleSuiteLoader.StartSite(),bci=52 -com.sun.midp.main.CldcMIDletSuiteLoader.startSuite(),bci=8 -com.sun.midp.main.AbstractMidleSuiteLoader.RunMidleSuite(),bci=161 -com.sun.midp.main.AppIsolateMidleSuiteLoader.main(),bci=26 javacall\u lifecycle\u state\u changed()生命周期:事件为 JAVACALL\u LIFECYCLE\u MIDLET\u关机状态为JAVACALL\u OK TestApp(j2me应用程序): JAR文件主类:Java me j2me中的NoClassDefFoundError,java-me,jar,midp,jsr179,Java Me,Jar,Midp,Jsr179,我已经构建了一个jar文件,并试图在j2me应用程序中使用它。我已经将jar包含在构建路径中,并导入了所需的类。但是当我运行我的j2me应用程序时,我在尝试实例化jar中存在的类的行中得到NoClassDefFound错误 我可以在java项目中实例化jar类,但不能在j2me中实例化 以下是错误日志: 警告-MMA- C:/Builds/jme-sdk/javacall-javame-sdk-305/implementation/share/jsr135_mmapi/ju_mmconfig.C
public class LocationUpdater {
private boolean isUpdateSuccess = false;
public static void main(String[] args){
}
public boolean updateLocation(final String serverUrl, final String userMSISDN) throws LocationException{
AppConstants.url = serverUrl;
AppConstants.msisdn = userMSISDN;
LocationCanvas loc = new LocationCanvas();
isUpdateSuccess = loc.getLocation(serverUrl, userMSISDN);
return isUpdateSuccess;
}
}
LocationCanvas类:
public class LocationCanvas {
private Location location;
private LocationProvider locationProvider;
private Coordinates coordinates;
private Criteria criteria;
private Timer tm;
private double lat, lon;
private String posturl;
private boolean status,updateStatus;
public LocationCanvas() {
}
public boolean getLocation(String url, String msisdn) {
tm = new Timer();
criteria = new Criteria();
criteria.setHorizontalAccuracy(500);
try {
locationProvider = LocationProvider.getInstance(criteria);
if (locationProvider != null) {
tm.wait(4000);
try {
location = locationProvider.getLocation(2000);
} catch (Exception e) {
System.out.println(e.getMessage());
}
coordinates = (Coordinates)location.getQualifiedCoordinates();
if (coordinates != null) {
// Use coordinate information
lat = coordinates.getLatitude();
lon = coordinates.getLongitude();
System.out.println("Latitude :"+lat);
System.out.println("Longitude :"+lon);
}
posturl = url + "?IMEI=" + msisdn
+ "&positioningtype=" + "gps" + "&locationdata=" + lat
+ "," + lon;
}else{
//return false.. cos location provider is null
updateStatus = false;
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
return updateStatus;
}
错误日志:
线程“main”java.lang.NoClassDefFoundError中出现异常:
javax/microedition/location/Coordinates
在com.canvasm.ida.gps.LocationUpdater.updateLocation(LocationUpdater.java:17)
位于com.test.HelloTest.main(HelloTest.java:10)
原因:java.lang.ClassNotFoundException:javax.microedition.location.Coordinates
位于java.net.URLClassLoader$1.run(URLClassLoader.java:202)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.net.URLClassLoader.findClass(URLClassLoader.java:190)
位于java.lang.ClassLoader.loadClass(ClassLoader.java:307)
任何帮助都将不胜感激。它指定编译时存在的类文件在运行时找不到。请检查生成时和运行时类路径。最终能够解决此问题。
问题不在代码中。这是由于汇编问题 首先要解决
NoClassDefFoundError
,我必须右键单击项目,然后在构建路径->订单和导出->检查您添加的jar
后来在运行时,我遇到了类格式错误56
创建的jar文件是使用1.6v编译的j2me应用程序是用1.3v编译的 我不得不用
1.3v
重新编译我的库项目,并用它创建一个jar,然后在j2me应用程序中使用它
以下是指南链接:我在新项目中测试您的类(当然没有AppConstants、LocationCanvas,因为我没有它们),并且没有发生错误!
public class LocationCanvas {
private Location location;
private LocationProvider locationProvider;
private Coordinates coordinates;
private Criteria criteria;
private Timer tm;
private double lat, lon;
private String posturl;
private boolean status,updateStatus;
public LocationCanvas() {
}
public boolean getLocation(String url, String msisdn) {
tm = new Timer();
criteria = new Criteria();
criteria.setHorizontalAccuracy(500);
try {
locationProvider = LocationProvider.getInstance(criteria);
if (locationProvider != null) {
tm.wait(4000);
try {
location = locationProvider.getLocation(2000);
} catch (Exception e) {
System.out.println(e.getMessage());
}
coordinates = (Coordinates)location.getQualifiedCoordinates();
if (coordinates != null) {
// Use coordinate information
lat = coordinates.getLatitude();
lon = coordinates.getLongitude();
System.out.println("Latitude :"+lat);
System.out.println("Longitude :"+lon);
}
posturl = url + "?IMEI=" + msisdn
+ "&positioningtype=" + "gps" + "&locationdata=" + lat
+ "," + lon;
}else{
//return false.. cos location provider is null
updateStatus = false;
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
return updateStatus;
}