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我有一個休息Web服務，它使用休眠技術從我的SQL數據庫中取回數據。在運行時，網絡服務隊拋出下面其他Web服務存在問題？
java.lang.NoClassDefFoundError: Could not initialize class com.sample.restlet.HibernateSessionFactory
com.sample.restlet.EmployeeResource.(EmployeeResource.java:22)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
java.lang.reflect.Constructor.newInstance(Unknown Source)
java.lang.Class.newInstance0(Unknown Source)
java.lang.Class.newInstance(Unknown Source)
com.sun.jersey.server.spi.component.ResourceComponentConstructor._construct(ResourceComponentConstructor.java:158)
com.sun.jersey.server.spi.component.ResourceComponentConstructor.construct(ResourceComponentConstructor.java:148)
com.sun.jersey.server.impl.resource.PerRequestFactory$PerRequest._getInstance(PerRequestFactory.java:175)
com.sun.jersey.server.impl.resource.PerRequestFactory$AbstractPerRequest.getInstance(PerRequestFactory.java:132)
com.sun.jersey.server.impl.application.WebApplicationContext.getResource(WebApplicationContext.java:160)
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:64)
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:63)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:543)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:502)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:493)
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:308)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:314)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:239)
的錯誤，我不明白爲什麼這個問題來了。請幫忙。