SeamViewHandler.calculateLocale上的JSF NullPointerException

我一直在尝试在我的JSF webapp中读取数据库。我正在使用BalusC Code博客提供的代码： http://balusc.blogspot.com/2008/07/dao-tutorial-data-layer.html http://balusc.blogspot.com/2008/07/dao-tutorial-use-in-jsf.html 但是，当我设置所有内容并在Tomcat 6上启动时，我收到了此错误（完整的stractrace）： 
SEVERE: uncaught exception
java.lang.NullPointerException
    at org.jboss.seam.Component.getInstance(Component.java:1859)
    at org.jboss.seam.Component.getInstance(Component.java:1852)
    at org.jboss.seam.Component.getInstance(Component.java:1829)
    at org.jboss.seam.web.Session.getInstance(Session.java:122)
    at org.jboss.seam.contexts.FacesLifecycle.beginRequest(FacesLifecycle.java:54)
    at org.jboss.seam.jsf.SeamPhaseListener.beforeRestoreView(SeamPhaseListener.java:366)
    at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:137)
    at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:114)
    at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:214)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:96)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:103)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
    at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
    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:127)
    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:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)
2011-01-28 15:38:46 org.jboss.seam.jsf.SeamPhaseListener beforePhase
SEVERE: swallowing exception
java.lang.NullPointerException
    at org.jboss.seam.Component.getInstance(Component.java:1859)
    at org.jboss.seam.Component.getInstance(Component.java:1852)
    at org.jboss.seam.Component.getInstance(Component.java:1829)
    at org.jboss.seam.web.Session.getInstance(Session.java:122)
    at org.jboss.seam.contexts.FacesLifecycle.beginRequest(FacesLifecycle.java:54)
    at org.jboss.seam.jsf.SeamPhaseListener.beforeRestoreView(SeamPhaseListener.java:366)
    at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:137)
    at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:114)
    at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:214)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:96)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:103)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
    at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
    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:127)
    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:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)
2011-01-28 15:38:46 com.sun.faces.lifecycle.Phase doPhase
SEVERE: JSF1054: (Phase ID: RESTORE_VIEW 1, View ID: ) Exception thrown during phase execution: javax.faces.event.PhaseEvent[source=com.sun.faces.lifecycle.LifecycleImpl@ce2c57]
2011-01-28 15:38:46 org.jboss.seam.jsf.SeamPhaseListener afterPhase
SEVERE: uncaught exception
java.lang.NullPointerException
    at org.jboss.seam.jsf.SeamPhaseListener.raiseEventsAfterPhase(SeamPhaseListener.java:421)
    at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:175)
    at com.sun.faces.lifecycle.Phase.handleAfterPhase(Phase.java:175)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:114)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:103)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
    at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
    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:127)
    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:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)
2011-01-28 15:38:46 org.jboss.seam.jsf.SeamPhaseListener afterPhase
SEVERE: swallowing exception
java.lang.NullPointerException
    at org.jboss.seam.jsf.SeamPhaseListener.raiseEventsAfterPhase(SeamPhaseListener.java:421)
    at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:175)
    at com.sun.faces.lifecycle.Phase.handleAfterPhase(Phase.java:175)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:114)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:103)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
    at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
    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:127)
    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:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)
2011-01-28 15:38:46 org.ajax4jsf.webapp.BaseXMLFilter doXmlFilter
SEVERE: Exception in the filter chain
javax.servlet.ServletException
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
    at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
    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:127)
    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:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at org.jboss.seam.jsf.SeamViewHandler.calculateLocale(SeamViewHandler.java:55)
    at org.ajax4jsf.application.ViewHandlerWrapper.calculateLocale(ViewHandlerWrapper.java:65)
    at com.sun.faces.application.ViewHandlerImpl.createView(ViewHandlerImpl.java:372)
    at org.jboss.seam.jsf.SeamViewHandler.createView(SeamViewHandler.java:68)
    at org.ajax4jsf.application.ViewHandlerWrapper.createView(ViewHandlerWrapper.java:79)
    at org.ajax4jsf.application.AjaxViewHandler.createView(AjaxViewHandler.java:93)
    at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:204)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:103)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
    ... 18 more
    
2019-09-14 3 条评论
分享

没有找到相关结果

    已邀请:

    抹持奠糙驰

    我得到了同样的错误，发现问题实际上是我在
    web.xml
    中忘记了几行来激活Seam听众： 
    <listener>
    <listener-class>org.jboss.seam.servlet.SeamListener</listener-class>
</listener>
    这闻起来像一个容易重复的错误，所以也许这个答案可以解决一些寻找解决方案的不幸的人。 （OTOH，就像任何
    NullPointerException
    一样，它可能有很多其他原因发生，据我所知，它们都没有在堆栈跟踪中得到很好的描述。）     
    2019-09-14 0 0
    分享

    穗揣

    它似乎在寻找区域设置 - 您是否在配置文件中设置了一个，如果是，那么您的应用程序中是否存在该区域设置？     
    2019-09-14 0 0
    分享
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