我正在使用 Apache MINA 2.0.4 为 android 开发应用程序。它在我测试过的所有版本上都运行良好，但在 HTC Desire 上是 2.2.2。
客户端设法连接到服务器，但是一旦服务器发送消息，我就会收到 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
我正在使用 ObjectSerializationCodecFactory 并且无法弄清楚出了什么问题。我曾尝试在 Android 2.2 上使用“常规”Java 序列化并且效果很好。
这是连接的代码：
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();
在调用 messageReceived 之前，异常在处理程序中被捕获。
感谢您提供有关此异常的任何信息！
谢谢