Smack拋出“NoClassDefFoundError：失敗的解決方案：Lorg / jxmpp / util / XmppStringUtils”

Question

我的應用程序出了問題，我想在其中創建一個連接到我的服務器的簡單XMPP客戶端。 當我啟動應用程序時（編譯運行沒有問題）我遇到了以下問題，但我的應用程序立即關閉。

   java.lang.NoClassDefFoundError: Failed resolution of: Lorg/jxmpp/util/XmppStringUtils;
        at org.jivesoftware.smack.provider.ProviderManager.getKey(ProviderManager.java:314)
        at org.jivesoftware.smack.provider.ProviderManager.addStreamFeatureProvider(ProviderManager.java:304)
        at org.jivesoftware.smack.provider.ProviderManager.addLoader(ProviderManager.java:140)
        at org.jivesoftware.smack.initializer.UrlInitializer.initialize(UrlInitializer.java:54)
        at org.jivesoftware.smack.SmackInitialization.loadSmackClass(SmackInitialization.java:232)
        at org.jivesoftware.smack.SmackInitialization.parseClassesToLoad(SmackInitialization.java:193)
        at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:163)
        at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:148)
        at org.jivesoftware.smack.SmackInitialization.<clinit>(SmackInitialization.java:116)
        at org.jivesoftware.smack.SmackConfiguration.getVersion(SmackConfiguration.java:96)
        at org.jivesoftware.smack.ConnectionConfiguration.<clinit>(ConnectionConfiguration.java:38)
        at org.reisacher.zapp.Main.login(Main.java:30)
        at org.reisacher.zapp.Main.onCreate(Main.java:73)
        at android.app.Activity.performCreate(Activity.java:5990)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
        at android.app.ActivityThread.access$800(ActivityThread.java:151)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5257)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "org.jxmpp.util.XmppStringUtils" on path: DexPathList[[zip file "/data/app/org.reisacher.zapp-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:469
at org.jivesoftware.smack.provider.ProviderManager.getKey(ProviderManager.java:314)
at org.jivesoftware.smack.provider.ProviderManager.addStreamFeatureProvider(ProviderManager.java:304)
            at org.jivesoftware.smack.provider.ProviderManager.addLoader(ProviderManager.java:140)
            at org.jivesoftware.smack.initializer.UrlInitializer.initialize(UrlInitializer.java:54)
            at org.jivesoftware.smack.SmackInitialization.loadSmackClass(SmackInitialization.java:232)
            at org.jivesoftware.smack.SmackInitialization.parseClassesToLoad(SmackInitialization.java:193)
            at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:163)
            at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:148)
            at org.jivesoftware.smack.SmackInitialization.<clinit>(SmackInitialization.java:116)
            at org.jivesoftware.smack.SmackConfiguration.getVersion(SmackConfiguration.java:96)
            at org.jivesoftware.smack.ConnectionConfiguration.<clinit>(ConnectionConfiguration.java:38)
            at org.reisacher.zapp.Main.login(Main.java:30)
            at org.reisacher.zapp.Main.onCreate(Main.java:73)
            at android.app.Activity.performCreate(Activity.java:5990)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
            at android.app.ActivityThread.access$800(ActivityThread.java:151)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5257)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Suppressed: java.lang.ClassNotFoundException: org.jxmpp.util.XmppStringUtils
        at java.lang.Class.classForName(Native Method)
        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
        ... 27 more
 Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

但我不知道找不到任何與丟失的“XmppStringUtils”相關的內容

這是第30行的代碼

public void login() throws XMPPException, IOException, SmackException {
    XMPPTCPConnectionConfiguration config = XMPPTCPConnectionConfiguration.builder()
            .setServiceName("reisacher.de")
            .setHost("192.168.178.6")
            .setPort(5222)
            .build();

    AbstractXMPPConnection connection = new XMPPTCPConnection(config);
    connection.connect();
    connection.login(username, password);
}

這些是我的進口商品

import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration;

再加上我的build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
apply plugin: 'jetty'
buildscript {
    repositories {
        maven {
            url 'https://oss.sonatype.org/content/repositories/snapshots'
        }
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.2.3'
    }
}

dependencies {
    compile "org.igniterealtime.smack:smack-android:4.1.1"
    compile "org.igniterealtime.smack:smack-tcp:4.1.1"
    // optional features
    compile "org.igniterealtime.smack:smack-android-extensions:4.1.1"
    compile "org.igniterealtime.smack:smack-core:4.1.1"
}

allprojects {
    repositories {
        jcenter()
    }
}

謝謝

Answer 1

您需要四個額外的jar文件。

1）jxmpp-core.jar

2）jxmpp-jid.jar

3）jxmpp-stringprep-libidn

4）jxmpp-util-cache

您可以從下面的鏈接下載所有這些。

https://oss.sonatype.org/content/repositories/releases/org/jxmpp/

Answer 2

問題來自一個依賴de.measite.minidns，它推動了一個帶有bug的更新。 所以我通過排除自動依賴並包括最后一個穩定版本來修復它。 它解決了我的問題。

compile('org.igniterealtime.smack:smack-android-extensions:4.2.0') {
    exclude group: 'de.measite.minidns'
}
compile('org.igniterealtime.smack:smack-tcp:4.2.0') {
    exclude group: 'de.measite.minidns'
}
compile group: 'de.measite.minidns', name: 'minidns-hla', version: '0.2.2'

Answer 3

來自NoClassDefFoundError的javadoc ：

如果Java虛擬機或ClassLoader實例嘗試加載類的定義（作為普通方法調用的一部分或作為使用新表達式創建新實例的一部分）並且無法找到類的定義，則拋出該異常。

Java使用動態鏈接，這意味着首次使用時會鏈接符號（類名，...）。 正如Mohit已經指出的那樣，你似乎錯過了JXMPP庫，它是Smack的（傳遞）依賴。 我假設您通過簡單地將它放入libs/文件夾中，確實將Smack添加到您的項目中。 不建議采用這種方法，因為你很容易錯過Smack的一種特殊依賴性，就像它發生在你身上一樣。 而是使用能夠解析Maven或Gradle等依賴關系的構建系統。 也可以看看：

• 如何在Android中使用Smack 4.1？
• Smack 4.1自述文件和升級指南