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我遇到了一个问题，当 android 上的 Mina 客户端尝试反序列化一个对象时，发生了 ClassNotFoundException。堆栈如下图所示：

04-13 01:56:21.521: 
04-13 01:56:21.521: D/RegisterTask(299): Caused by: org.apache.mina.filter.codec.ProtocolDecoderException: java.lang.ClassNotFoundException: com.geoxy.message.agent.user.RegisterResponse (Hexdump: 12 00 00 2A 00 00 00 DA 12 04 00 02 00 00 00 D2 AC ED 00 05 73 72 01 00 2D 63 6F 6D 2E 67 65 6F 78 79 2E 6D 65 73 73 61 67 65 2E 61 67 65 6E 74 2E 75 73 65 72 2E 52 65 67 69 73 74 65 72 52 65 73 70 6F 6E 73 65 78 72 01 00 1D 63 6F 6D 2E 67 65 6F 78 79 2E 63 6F 6D 6D 6F 6E 2E 52 65 73 70 6F 6E 73 65 42 61 73 65 78 72 01 00 1C 63 6F 6D 2E 67 65 6F 78 79 2E 63 6F 6D 6D 6F 6E 2E 4D 65 73 73 61 67 65 42 61 73 65 78 70 12 04 00 02 73 72 01 00 2D 63 6F 6D 2E 67 65 6F 78 79 2E 63 6F 6D 6D 6F 6E 2E 4D 65 73 73 61 67 65 42 61 73 65 24 4D 65 73 73 61 67 65 53 69 67 6E 61 74 75 72 65 78 70 00 00 00 00 00 00 00 03 00 00 00 00 00 00 00 00 71 00 7E 00 03 00 70 00 00 00 00 00 00 00 03)

04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:251)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$5(DefaultIoFilterChain.java:429)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:715)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:668)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:657)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$9(AbstractPollingIoProcessor.java:654)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1141)
04-13 01:56:21.521: D/RegisterTask(299):    at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)

但是我不明白，缺少的类“com.geoxy.message.agent.user.RegisterResponse”实际上包含在message.jar中，我已经将message.jar放在了项目构建路径下。（并且服务器也使用相同的 message.jar 来序列化类。）

而且我还检查了项目.classpath，它包含了message.jar。

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry exported="true" kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
    <classpathentry kind="src" path="src"/>
    <classpathentry kind="src" path="gen"/>
    <classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
    <classpathentry kind="lib" path="libs/dumpcatcher.jar"/>
    <classpathentry kind="lib" path="libs/common-0.1.jar"/>
    <classpathentry kind="lib" path="libs/log4j-1.2.16.jar"/>
    <classpathentry kind="lib" path="libs/slf4j-android-1.6.1-RC1.jar"/>
    <classpathentry kind="lib" path="libs/message-0.1.jar"/>    <!---here is it.-->
    <classpathentry kind="lib" path="libs/mina-core-2.0.4.jar"/>
    <classpathentry kind="output" path="bin/classes"/>
</classpath>

请帮忙，还有其他原因导致ClassNotFoundException吗？非常感谢。我还在这篇文章中放了一些信息：Run (synchronize) mina client on Android, how to resolve ClassNotFoundException

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1 回答 1

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I think in the Message.jar the class you are trying to access ""egisterResponse" extends the activity, In these case you must add these activity in your manifeast file..like below

<activity android:name="com.geoxy.message.agent.user.RegisterResponse" />

Also remember that if any of our external jar has classess that extends Activity then that activity must be declared in our manifeast file too.

Try this might help you.

Or try placeing your jar file in libs folder of your project and then link it up and try.

于 2012-04-13T03:04:04.907 回答