Android 2.2上的Apache MINA中的NullPointerException

Question

我正在为使用Apache MINA 2.0.4的android开发应用程序。它在我测试过的所有版本上运行良好，但在HTC Desire上为2.2.2。

客户端管理连接到服务器，但一旦服务器发送一个消息，我得到一个NullPointerException：

04-16 13:45:25.992: E/EXCEPTION(18456): NETWORK 
04-16 13:45:25.992: E/EXCEPTION(18456): org.apache.mina.filter.codec.ProtocolDecoderException: java.lang.NullPointerException (Hexdump: 00 00 00 32 AC ED 00 05 73 72 01 00 25 63 6F 6D 2E 62 6F 6C 6C 73 2E 73 68 61 72 65 64 2E 77 77 77 2E 48 69 67 68 4C 65 76 65 6C 4D 65 73 73 61 67 65 78 70 28 70) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:251) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:715) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:668) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:657) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$600(AbstractPollingIoProcessor.java:68) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1141) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.lang.Thread.run(Thread.java:1102) 
04-16 13:45:25.992: E/EXCEPTION(18456): Caused by: java.lang.NullPointerException 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.io.ObjectStreamField.resolve(ObjectStreamField.java:351) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1863) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:826) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2066) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:929) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2285) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2240) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.core.buffer.AbstractIoBuffer.getObject(AbstractIoBuffer.java:2215) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.filter.codec.serialization.ObjectSerializationDecoder.doDecode(ObjectSerializationDecoder.java:92) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.filter.codec.CumulativeProtocolDecoder.decode(CumulativeProtocolDecoder.java:178) 
04-16 13:45:25.992: E/EXCEPTION(18456):  at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:241) 
04-16 13:45:25.992: E/EXCEPTION(18456):  ... 15 more 

我使用的ObjectSerializationCodecFactory是，不能弄清楚什么是错的。我试图在Android 2.2上使用“常规”Java序列化，并且工作正常。

下面是连接的代码：

NioSocketConnector tConnector = new NioSocketConnector(); 

    tConnector.setConnectTimeoutMillis(CONNECT_TIMEOUT); 
    tConnector.getFilterChain().addLast("codec", new ProtocolCodecFilter(new ObjectSerializationCodecFactory())); 
    tConnector.setHandler(new ClientHandler()); 

    try{ 
     ConnectFuture future = tConnector.connect(new InetSocketAddress(HOSTNAME, PORT)); 
     future.awaitUninterruptibly(); 
     mSession = future.getSession(); 
     Globals.hideDialog(); 
    }catch (RuntimeIoException e){ 
     Globals.hideDialog(); 
     Globals.showConnectionErrorDialog("Failed to connect to server"); 
    } 

    // wait until the summation is done 
    if(mSession != null) 
     mSession.getCloseFuture().awaitUninterruptibly(); 
    tConnector.dispose(); 

该例外被捕获在处理程序，的messageReceived被调用之前。

关于这个例外的任何信息表示赞赏！

谢谢

Answer 1

我认为ClientHandler（）是接口。你需要尝试BasicClientHandler（）。