Jade Agents中的NoClassDefFoundError？

Question

我创建了两个代理，它运行得很好。但是当我添加Ontology类并注册本体时，我无法创建代理...我得到了以下错误..

Jun 1, 2012 8:56:55 AM jade.core.BaseService init
INFO: Service jade.core.management.AgentManagement initialized
Jun 1, 2012 8:56:55 AM jade.core.BaseService init
INFO: Service jade.core.messaging.Messaging initialized
Jun 1, 2012 8:56:55 AM jade.core.BaseService init
INFO: Service jade.core.mobility.AgentMobility initialized
Jun 1, 2012 8:56:55 AM jade.core.BaseService init
INFO: Service jade.core.event.Notification initialized
Jun 1, 2012 8:56:55 AM jade.core.messaging.MessagingService clearCachedSlice
INFO: Clearing cache
Jun 1, 2012 8:56:55 AM jade.mtp.http.HTTPServer <init>
INFO: HTTP-MTP Using XML parser com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser
Jun 1, 2012 8:56:55 AM jade.core.messaging.MessagingService boot
INFO: MTP addresses:
http://169.254.108.164:7778/acc
Jun 1, 2012 8:56:55 AM jade.core.AgentContainerImpl startBootstrapAgents
SEVERE: Cannot create agent STMAgent: An undeclared exception was thrown [nested   java.lang.ExceptionInInitializerError]
Jun 1, 2012 8:56:55 AM jade.core.AgentContainerImpl startBootstrapAgents
SEVERE: Cannot create agent REquestAgent: An undeclared exception was thrown [nested java.lang.NoClassDefFoundError: Could not initialize class FruitOntology.FruitOntology]
Jun 1, 2012 8:56:55 AM jade.core.AgentContainerImpl joinPlatform

类路径是正确的。本体类路径也是正确的。这是什么原因呢？请帮帮我.我发现错误..它在我的本体类上..谢谢。。

Answer 1

关键的错误信息似乎是：

SEVERE: Cannot create agent REquestAgent: An undeclared exception was thrown 
  [nested java.lang.NoClassDefFoundError: 
   Could not initialize class FruitOntology.FruitOntology]

您的代码没有在FruitOntology包中找到类FruitOntology (这不是一个很好的包名-通常，包名应该以小写字母开头，并且通常遵循颠倒组织域名的约定)。

由于您还没有展示任何代码，我们只能猜测为什么会出现这个错误。您是否在某个配置文件中将该名称拼写错误？在项目中执行grep以查看FruitOntology.FruitOntology发生的位置。它可能不是用普通的Java代码编写的，因为您可能会因为缺少类而得到编译错误，除非您出于某种原因使用Java反射。