原因: java.lang.NoClassDefFoundError:解析失败: Lorg/kxml2/io/KXmlSerializer；

Question

我使用Ksoap2库来处理soap webservices.But am gettig错误No class def found issues.Can有人请解释一下到底是什么问题和解决方案。我在libs文件夹中添加了Ksoap2 jar，右击它并选择Add as libary选项。下面是我的代码。

下面是我的Gradle：

repositories {
    mavenCentral()
    maven {
        url 'https://oss.sonatype.org/content/repositories/ksoap2-android-releases/'
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation files('libs/ksoap2-android-2.5.2.jar')
}

下面是我的webserive代码：

 SoapObject request = new SoapObject(NAMESPACE,METHOD_GET_PO);
                SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                request.addProperty("uCode", mUCode);
                envelope.dotNet = true;// to handle .net services asmx/aspx
                envelope.setOutputSoapObject(request);
                HttpTransportSE ht = new HttpTransportSE(URL_PROTOCOL+  settings.getSettings_Serverpath() + URL_SERVICE_NAME);
                ht.debug = true;
                String soap_action = NAMESPACE + METHOD_GET_PO;
                ht.call(soap_action, envelope);
                SoapPrimitive resultString = (SoapPrimitive) envelope.getResponse();

我收到以下错误：

    --------- beginning of crash
2019-07-25 15:55:49.766 12018-12064/com.example.sivabala.visualporeceiving E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
    Process: com.example.sivabala.visualporeceiving, PID: 12018
    java.lang.RuntimeException: An error occurred while executing doInBackground()
        at android.os.AsyncTask$3.done(AsyncTask.java:354)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
        at java.util.concurrent.FutureTask.run(FutureTask.java:271)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:914)
     Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Lorg/kxml2/io/KXmlSerializer;
        at org.ksoap2.transport.Transport.createRequestData(Transport.java:80)
        at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:79)
        at com.example.sivabala.visualporeceiving.CI.controller.LoginActivity$GetPO.doInBackground(LoginActivity.java:184)
        at com.example.sivabala.visualporeceiving.CI.controller.LoginActivity$GetPO.doInBackground(LoginActivity.java:149)
        at android.os.AsyncTask$2.call(AsyncTask.java:333)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:914) 
     Caused by: java.lang.ClassNotFoundException: Didn't find class "org.kxml2.io.KXmlSerializer" on path: DexPathList[[zip file "/data/app/com.example.sivabala.visualporeceiving-yscH3NKMSUtvYDIdp2ANSQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.sivabala.visualporeceiving-yscH3NKMSUtvYDIdp2ANSQ==/lib/x86, /system/lib, /system/product/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:195)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at org.ksoap2.transport.Transport.createRequestData(Transport.java:80) 
        at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:79) 
        at com.example.sivabala.visualporeceiving.CI.controller.LoginActivity$GetPO.doInBackground(LoginActivity.java:184) 
        at com.example.sivabala.visualporeceiving.CI.controller.LoginActivity$GetPO.doInBackground(LoginActivity.java:149) 
        at android.os.AsyncTask$2.call(AsyncTask.java:333) 
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:914) 

Answer 1

通过从以下网址获取更新的KSOAP Jar修复了该错误：https://oss.sonatype.org/content/repositories/ksoap2-android-releases/com/google/code/ksoap2-android/ksoap2-android-assembly/3.4.0/