我的 Myfaces 2 应用程序遇到实例化异常。但是通过 log4j 打印的异常会切断堆栈跟踪的其余部分。这是我所看到的：
javax.faces.FacesException：java.lang.InstantiationException
在 org.apache.myfaces.config.ManagedBeanBuilder.buildManagedBean(ManagedBeanBuilder.java:240)
在 org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.createManagedBean(ManagedBeanResolver.java:303)
在 org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.getValue(ManagedBeanResolver.java:266)
在 javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
在 org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:142)
在org.apache.myfaces.el.VariableResolverImpl.resolveVariable（VariableResolverImpl.java:65）
在 org.apache.myfaces.el.convert.VariableResolverToELResolver.getValue(VariableResolverToELResolver.java:116)
在 javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
在 org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:142)
在 org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:61)
在 org.apache.el.parser.AstValue.getValue(AstValue.java:107)
在 org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
在 org.apache.myfaces.view.facelets.el.TagValueExpression.getValue(TagValueExpression.java:85)
在 javax.faces.component._DeltaStateHelper.eval(_DeltaStateHelper.java:243)
在 javax.faces.component.UIOutput.getValue(UIOutput.java:71)
在 javax.faces.component.UIInput.getValue(UIInput.java:143)
在 javax.faces.component.UISelectBoolean.getValue(UISelectBoolean.java:148)
在 org.apache.myfaces.shared_impl.renderkit.RendererUtils.getObjectValue(RendererUtils.java:238)
在 org.apache.myfaces.shared_impl.renderkit.RendererUtils.getBooleanValue(RendererUtils.java:193)
在 org.apache.myfaces.shared_impl.renderkit.html.HtmlCheckboxRendererBase.encodeEnd（HtmlCheckboxRendererBase.java:79）
在 javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:519)
在 javax.faces.component.UIComponent.encodeAll(UIComponent.java:626)
在 javax.faces.component.UIComponent.encodeAll(UIComponent.java:622)
在 javax.faces.component.UIComponent.encodeAll(UIComponent.java:622)
在org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView（FaceletViewDeclarationLanguage.java:1320）
在 org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:263)
在 javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:59)
在 org.apache.myfaces.tomahawk.application.ResourceViewHandlerWrapper.renderView（ResourceViewHandlerWrapper.java:93）
在 org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:85)
在 org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:239)
在 javax.faces.webapp.FacesServlet.service(FacesServlet.java:191)
在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
在 org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:349)
在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:233）
在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java：191）
在 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
在 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
在 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
在 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
在 org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
在 org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
在 org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769)
在 org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698)
在 org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:891)
在 org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
在 java.lang.Thread.run(Thread.java:619)
引起原因：java.lang.InstantiationException
在 sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance（InstantiationExceptionConstructorAccessorImpl.java:30）
在 java.lang.reflect.Constructor.newInstance(Constructor.java:513)
在 java.lang.Class.newInstance0(Class.java:355)
在 java.lang.Class.newInstance(Class.java:308)
在 org.apache.myfaces.config.annotation.TomcatAnnotationLifecycleProvider.newInstance（TomcatAnnotationLifecycleProvider.java:49）
在 org.apache.myfaces.config.ManagedBeanBuilder.buildManagedBean(ManagedBeanBuilder.java:162)
... 48 更多
我找不到在哪里更改配置，所以我可以看到“... 48 more”。有任何想法吗？
你不能。堆栈跟踪的截断是 JVM 的功能，而不是 log4j 的功能。
它实际上只是丢弃已经向您提供的信息。
这... 48 more是一个简写the 48 frames that preceded the "Caused by" message。因此，在您的情况下，省略的 48 帧是：
org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.createManagedBean(ManagedBeanResolver.java:303) at
org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.getValue(ManagedBeanResolver.java:266) at
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) at
org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:142) at
org.apache.myfaces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:65) at
org.apache.myfaces.el.convert.VariableResolverToELResolver.getValue(VariableResolverToELResolver.java:116) at
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) at
org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:142) at
org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:61) at
org.apache.el.parser.AstValue.getValue(AstValue.java:107) at
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) at
org.apache.myfaces.view.facelets.el.TagValueExpression.getValue(TagValueExpression.java:85) at
javax.faces.component._DeltaStateHelper.eval(_DeltaStateHelper.java:243) at
javax.faces.component.UIOutput.getValue(UIOutput.java:71) at
javax.faces.component.UIInput.getValue(UIInput.java:143) at
javax.faces.component.UISelectBoolean.getValue(UISelectBoolean.java:148) at
org.apache.myfaces.shared_impl.renderkit.RendererUtils.getObjectValue(RendererUtils.java:238) at
org.apache.myfaces.shared_impl.renderkit.RendererUtils.getBooleanValue(RendererUtils.java:193) at
org.apache.myfaces.shared_impl.renderkit.html.HtmlCheckboxRendererBase.encodeEnd(HtmlCheckboxRendererBase.java:79) at
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:519) at
javax.faces.component.UIComponent.encodeAll(UIComponent.java:626) at
javax.faces.component.UIComponent.encodeAll(UIComponent.java:622) at
javax.faces.component.UIComponent.encodeAll(UIComponent.java:622) at
org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(FaceletViewDeclarationLanguage.java:1320) at
org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:263) at
javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:59) at
org.apache.myfaces.tomahawk.application.ResourceViewHandlerWrapper.renderView(ResourceViewHandlerWrapper.java:93) at
org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:85) at
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:239) at
javax.faces.webapp.FacesServlet.service(FacesServlet.java:191) at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at
org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:349) at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190) at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291) at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769) at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698) at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:891) at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690) at
java.lang.Thread.run(Thread.java:619)
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