Question

我正在开发一个使用java mongodb驱动程序3.0.3连接到mongodb的每个实例的Android应用程序。

通用信息的连接符代码是：

try{
    MongoCredential credential = MongoCredential.createCredential(user, dbname, pass.toCharArray());
    MongoClient mongoClient = new MongoClient( new ServerAddress(server , port ), Arrays.asList(credential));
    MongoDatabase db = mongoClient.getDatabase(dbname);
    System.out.println("Connect to database successfully ");
    Iterator i= mongoClient.listDatabaseNames().iterator();
    while (i.hasNext()){
        Log.d("DATABASE", (String) i.next());
    }
    Iterator ic= db.listCollectionNames().iterator();
    while (ic.hasNext()){
        Log.d("COLLECTION", (String) ic.next());
    }
}catch(Exception e){
    System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}

在运行时我有一些错误：

09-11 19：13：50.898 7418-7418 / it.mysite.mongodbviewer W / org.bson.ObjectId：无法从JMX获取进程标识符，而是使用随机数而不是java.lang.NoClassDefFoundError：失败的解析： Ljava /郎/管理/ ManagementFactory;

和

com.mongodb.MongoException：java.lang.NoClassDefFoundError：com.mongodb.connection.ScramSha1Authenticator $ ScramSha1SaslClient

生成一个循环：

我/艺术：拒绝在先前失败的类java.lang.Class上重新初始化

任何人都有解决方案吗？ java / lang / management / ManagementFactory似乎不存在Android，你怎么解决？如果这是问题的中心。

提前致谢，Matteo

PS：完整的日志是：

09-11 19:13:50.898    7418-7418/it.mysite.mongodbviewer W/org.bson.ObjectId﹕ Failed to get process identifier from JMX, using random number instead
java.lang.NoClassDefFoundError: Failed resolution of: Ljava/lang/management/ManagementFactory;
at org.bson.types.ObjectId.createProcessIdentifier(ObjectId.java:502)
at org.bson.types.ObjectId.<clinit>(ObjectId.java:460)
at com.mongodb.connection.ClusterId.<init>(ClusterId.java:47)
at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:40)
at com.mongodb.Mongo.createCluster(Mongo.java:660)
at com.mongodb.Mongo.createCluster(Mongo.java:646)
at com.mongodb.Mongo.<init>(Mongo.java:275)
at com.mongodb.MongoClient.<init>(MongoClient.java:184)
at com.mongodb.MongoClient.<init>(MongoClient.java:160)
at it.mysite.mongodbmanager.data.MongoDBDriver.connect(MongoDBDriver.java:102)
at it.mysite.mongodbmanager.fragments.MongoDBAccountDetailFragment.onClick(MongoDBAccountDetailFragment.java:101)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19865)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "java.lang.management.ManagementFactory" on path: DexPathList[[zip file "/data/app/it.mysite.mongodbviewer-2/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.bson.types.ObjectId.createProcessIdentifier(ObjectId.java:502)
    at org.bson.types.ObjectId.<clinit>(ObjectId.java:460)
    at com.mongodb.connection.ClusterId.<init>(ClusterId.java:47)
    at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:40)
    at com.mongodb.Mongo.createCluster(Mongo.java:660)
    at com.mongodb.Mongo.createCluster(Mongo.java:646)
    at com.mongodb.Mongo.<init>(Mongo.java:275)
    at com.mongodb.MongoClient.<init>(MongoClient.java:184)
    at com.mongodb.MongoClient.<init>(MongoClient.java:160)
    at it.mysite.mongodbmanager.data.MongoDBDriver.connect(MongoDBDriver.java:102)
    at it.mysite.mongodbmanager.fragments.MongoDBAccountDetailFragment.onClick(MongoDBAccountDetailFragment.java:101)
    at android.view.View.performClick(View.java:4780)
    at android.view.View$PerformClick.run(View.java:19865)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5254)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Suppressed: java.lang.ClassNotFoundException: java.lang.management.ManagementFactory
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)
... 22 more
 Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
09-11 19:13:50.901    7418-7418/it.mysite.mongodbviewer I/cluster﹕ Cluster created with settings {hosts=[192.168.1.74:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
09-11 19:13:50.918    7418-7418/it.mysite.mongodbviewer I/System.out﹕ Connect to database successfully
09-11 19:13:50.924    7418-7418/it.mysite.mongodbviewer I/cluster﹕ No server chosen by ReadPreferenceServerSelector{readPreference=primary} from cluster description ClusterDescription{type=UNKNOWN, connectionMode=SINGLE, all=[ServerDescription{address=192.168.1.74:27017, type=UNKNOWN, state=CONNECTING}]}. Waiting for 30000 ms before timing out
09-11 19:13:50.954    7418-7487/it.mysite.mongodbviewer I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.mongodb.connection.ScramSha1Authenticator$ScramSha1SaslClient>
09-11 19:13:50.954    7418-7487/it.mysite.mongodbviewer I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.mongodb.connection.ScramSha1Authenticator$ScramSha1SaslClient>
09-11 19:13:50.955    7418-7487/it.mysite.mongodbviewer I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.mongodb.connection.ScramSha1Authenticator$ScramSha1SaslClient>
09-11 19:13:50.956    7418-7487/it.mysite.mongodbviewer I/cluster﹕ Exception in monitor thread while connecting to server 192.168.1.74:27017
com.mongodb.MongoException: java.lang.NoClassDefFoundError: com.mongodb.connection.ScramSha1Authenticator$ScramSha1SaslClient
at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:125)
at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:127)
at java.lang.Thread.run(Thread.java:818)
 Caused by: java.lang.NoClassDefFoundError: com.mongodb.connection.ScramSha1Authenticator$ScramSha1SaslClient
at com.mongodb.connection.ScramSha1Authenticator.createSaslClient(ScramSha1Authenticator.java:61)
at com.mongodb.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:42)
at com.mongodb.connection.DefaultAuthenticator.authenticate(DefaultAuthenticator.java:32)
at com.mongodb.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:99)
at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:44)
at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:115)
at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:127)
at java.lang.Thread.run(Thread.java:818)
09-11 19:13:51.479    7418-7487/it.mysite.mongodbviewer I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.mongodb.connection.ScramSha1Authenticator$ScramSha1SaslClient>
09-11 19:13:52.106    7418-7487/it.mysite.mongodbviewer I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.mongodb.connection.ScramSha1Authenticator$ScramSha1SaslClient>
09-11 19:13:52.637    7418-7487/it.mysite.mongodbviewer I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.mongodb.connection.ScramSha1Authenticator$ScramSha1SaslClient>

Answer 1

在我看来，ManagementFactory就是一个红色的鲱鱼，因为驱动程序捕获了异常，然后又回到使用随机数。

真正的问题似乎是驱动程序需要使用SCRAM-SHA-1进行身份验证，其实现导入以下类：

import javax.crypto.Mac;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslException;

我怀疑这些在Android平台上不可用，这不是Java运行时环境的完整实现。

您可以尝试的一件事是针对MongoDB 2.6运行，驱动程序的身份验证实现仅依赖于java.security.MessageDigest。

要考虑的另一件事是在移动应用程序和MongoDB之间放置一个REST服务，负责代理与数据库的所有交互。 REST应用程序可以在MongoDB驱动程序完全正常运行的环境中运行。

Answer 2

对于想在Android上使用github.com/mongodb/mongo-java-driver的人，我有一个解决方案！

我已经从u github.com/mongodb/mongo-java-driver和github.com/koterpillar/android-sasl的集成课程分叉到Android上修复javax.security.sasl。

重要提示：没有移植驱动程序 - 异步，因为Android上不存在java.nio.channels.AsynchronousSocketChannel，并且不存在任何移植。

结果是可以从https://github.com/matfur92/mongo-java-driver下载的同步MongoDB Android（Java）驱动程序

最后更新（2015年11月5日）： 3.2.0 -SNAPSHOT - ＆gt; https://github.com/matfur92/mongo-java-driver/blob/gh-pages/JARs/mongo-java-driver-3.2.0-SNAPSHOT.jar?raw=true

Answer 3

REST服务解决方法不是这样，我必须直接连接到mongodb实例。

修改

使用此移植功能在Android上正确移植了同步mongo-java-driver：https://github.com/matfur92/mongo-java-driver

没有移植驱动程序异步，因为Android上不存在java.nio.channels.AsynchronousSocketChannel并且不存在任何移植。

如果有人有解决方案让驱动程序异步工作请告诉我。问题出在java.nio.channels.AsynchronousSocketChannel，而Android不存在

mongodb 3.x驱动程序Android兼容性

3 个答案: