JSF中无法实例化bean对象
huzzy 2005-10-10 02:09:50 JSF的bean和faces-config.xml已经配置好了
然后在jsp页面中使用标签如:
<h:inputText value="#{user.name}"/>
但是页面报
java.lang.NullPointerException
at java.beans.Beans.instantiate(Beans.java:147)
at java.beans.Beans.instantiate(Beans.java:48)
at com.sun.faces.config.ManagedBeanFactory.newInstance(ManagedBeanFactory.java:203)
at com.sun.faces.application.ApplicationAssociate.createAndMaybeStoreManagedBeans(ApplicationAssociate.java:256)
at com.sun.faces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:78)
at com.sun.faces.el.impl.NamedValue.evaluate(NamedValue.java:125)
at com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:146)
at com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:243)
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:173)
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)
at javax.faces.component.UIOutput.getValue(UIOutput.java:147)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:82)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:191)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:169)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:720)
的错,请高手指教