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PONullPointerException: Passing value from one bean to another using CDI won't work
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12868417
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AcceptedAnswerId
12871951
AnswerCount
2
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CommentCount
3
CommunityOwnedDate
CreationDate
2012-10-12T23:24:49.273
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0
LastActivityDate
2012-11-13T15:50:24.517
LastEditDate
2012-10-13T00:55:50.293
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157882
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1505606
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I use this code in the JSF page <pre><code><h:outputText value="#{writeBean.t}" /> </code></pre> (and I have a beans.xml in WEB-INF folder) this is the WriteBean where the latter StringBean is injected: <pre><code>package huhu.main.managebean; import java.io.Serializable; import javax.enterprise.context.SessionScoped; import javax.enterprise.inject.Default; import javax.inject.Inject; import javax.inject.Named; @Default @Named @SessionScoped public class WriteBean implements Serializable { /** * */ private static final long serialVersionUID = 1L; String t; @Inject StringBean stringbean; public WriteBean() { setT(stringbean.getS()); } public String getT() { return t; } public void setT(String t) { this.t = t; } } </code></pre> and this is the StringBean where the string is set that I want to display on the JSF page: <pre><code>package huhu.main.managebean; import java.io.Serializable; import javax.enterprise.context.SessionScoped; import javax.enterprise.inject.Default; import javax.inject.Named; @Default @Named @SessionScoped public class StringBean implements Serializable { /** * */ private static final long serialVersionUID = 1L; String s = new String("WORKS!!"); public StringBean(){ } public String getS() { return s; } public void setS(String s) { this.s = s; } } </code></pre> and this is the exception: <pre><code> HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception javax.servlet.ServletException: java.lang.RuntimeException: java.lang.NullPointerException javax.faces.webapp.FacesServlet.service(FacesServlet.java:606) org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) root cause com.google.common.collect.ComputationException: java.lang.RuntimeException: java.lang.NullPointerException com.google.common.collect.ComputingConcurrentHashMap$ComputingMapAdapter.get(ComputingConcurrentHashMap.java:397) org.jboss.weld.bean.proxy.ClientProxyProvider.getClientProxy(ClientProxyProvider.java:102) org.jboss.weld.el.AbstractWeldELResolver.lookup(AbstractWeldELResolver.java:115) org.jboss.weld.el.AbstractWeldELResolver.getValue(AbstractWeldELResolver.java:96) org.jboss.as.weld.webtier.jsf.ForwardingELResolver.getValue(ForwardingELResolver.java:46) javax.el.CompositeELResolver.getValue(CompositeELResolver.java:175) com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:72) org.apache.el.parser.AstValue.getValue(AstValue.java:147) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182) javax.faces.component.UIOutput.getValue(UIOutput.java:169) com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205) com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355) com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164) javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402) com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125) javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288) com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) root cause java.lang.RuntimeException: java.lang.NullPointerException org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInstantiation(SecureReflectionAccess.java:186) org.jboss.weld.util.reflection.SecureReflections.newInstance(SecureReflections.java:340) org.jboss.weld.bean.proxy.ProxyFactory.create(ProxyFactory.java:240) org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:87) org.jboss.weld.bean.proxy.ClientProxyProvider.access$000(ClientProxyProvider.java:43) org.jboss.weld.bean.proxy.ClientProxyProvider$1.apply(ClientProxyProvider.java:53) org.jboss.weld.bean.proxy.ClientProxyProvider$1.apply(ClientProxyProvider.java:46) com.google.common.collect.ComputingConcurrentHashMap$ComputingValueReference.compute(ComputingConcurrentHashMap.java:355) com.google.common.collect.ComputingConcurrentHashMap$ComputingSegment.compute(ComputingConcurrentHashMap.java:184) com.google.common.collect.ComputingConcurrentHashMap$ComputingSegment.getOrCompute(ComputingConcurrentHashMap.java:153) com.google.common.collect.ComputingConcurrentHashMap.getOrCompute(ComputingConcurrentHashMap.java:69) com.google.common.collect.ComputingConcurrentHashMap$ComputingMapAdapter.get(ComputingConcurrentHashMap.java:393) org.jboss.weld.bean.proxy.ClientProxyProvider.getClientProxy(ClientProxyProvider.java:102) org.jboss.weld.el.AbstractWeldELResolver.lookup(AbstractWeldELResolver.java:115) org.jboss.weld.el.AbstractWeldELResolver.getValue(AbstractWeldELResolver.java:96) org.jboss.as.weld.webtier.jsf.ForwardingELResolver.getValue(ForwardingELResolver.java:46) javax.el.CompositeELResolver.getValue(CompositeELResolver.java:175) com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:72) org.apache.el.parser.AstValue.getValue(AstValue.java:147) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182) javax.faces.component.UIOutput.getValue(UIOutput.java:169) com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205) com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355) com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164) javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402) com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125) javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288) com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) root cause java.lang.NullPointerException huhu.main.managebean.WriteBean.<init>(WriteBean.java:25) huhu.main.managebean.WriteBean$Proxy$_$$_WeldClientProxy.<init>(WriteBean$Proxy$_$$_WeldClientProxy.java) 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) org.jboss.weld.util.reflection.SecureReflections$16.work(SecureReflections.java:343) org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52) org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInstantiation(SecureReflectionAccess.java:173) org.jboss.weld.util.reflection.SecureReflections.newInstance(SecureReflections.java:340) org.jboss.weld.bean.proxy.ProxyFactory.create(ProxyFactory.java:240) org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:87) org.jboss.weld.bean.proxy.ClientProxyProvider.access$000(ClientProxyProvider.java:43) org.jboss.weld.bean.proxy.ClientProxyProvider$1.apply(ClientProxyProvider.java:53) org.jboss.weld.bean.proxy.ClientProxyProvider$1.apply(ClientProxyProvider.java:46) com.google.common.collect.ComputingConcurrentHashMap$ComputingValueReference.compute(ComputingConcurrentHashMap.java:355) com.google.common.collect.ComputingConcurrentHashMap$ComputingSegment.compute(ComputingConcurrentHashMap.java:184) com.google.common.collect.ComputingConcurrentHashMap$ComputingSegment.getOrCompute(ComputingConcurrentHashMap.java:153) com.google.common.collect.ComputingConcurrentHashMap.getOrCompute(ComputingConcurrentHashMap.java:69) com.google.common.collect.ComputingConcurrentHashMap$ComputingMapAdapter.get(ComputingConcurrentHashMap.java:393) org.jboss.weld.bean.proxy.ClientProxyProvider.getClientProxy(ClientProxyProvider.java:102) org.jboss.weld.el.AbstractWeldELResolver.lookup(AbstractWeldELResolver.java:115) org.jboss.weld.el.AbstractWeldELResolver.getValue(AbstractWeldELResolver.java:96) org.jboss.as.weld.webtier.jsf.ForwardingELResolver.getValue(ForwardingELResolver.java:46) javax.el.CompositeELResolver.getValue(CompositeELResolver.java:175) com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:72) org.apache.el.parser.AstValue.getValue(AstValue.java:147) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182) javax.faces.component.UIOutput.getValue(UIOutput.java:169) com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205) com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355) com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164) javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402) com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125) javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288) com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) note The full stack trace of the root cause is available in the JBoss Web/7.0.13.Final logs. JBoss Web/7.0.13.Final </code></pre>
Tags
<jsf><exception><dependency-injection><javabeans><cdi>
Title
NullPointerException: Passing value from one bean to another using CDI won't work
singulars
PostAcceptedAnswerId
1. PO
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 PTAnswer
PostParentId
1. This table or related slice is empty.
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1. PTQuestion
UserLastEditorUserId
1. USBalusC
UserOwnerUserId
1. USLester
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PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
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VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId

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