|
| [JBoss Seam] - Could not instantiate Seam component
error Lle 19:37:13 |
| | Hi,
I have a conversation scope action class, which has a bijectional conversation-scope object as a DataModelSelection. When I executed an ajax4jsf request (from an a4j:commandLink), I always get the following exception:
org.jboss.seam.InstantiationException: Could not instantiate Seam component: selectedSession
| at org.jboss.seam.Component.newInstance(Component.java:1722)
| at org.jboss.seam.Component.getInstance(Component.java:1625)
| at org.jboss.seam.Component.getInstance(Component.java:1592)
| at org.jboss.seam.jsf.SeamVariableResolver.resolveVariable(SeamVariableResolver.java:46)
| at org.apache.myfaces.trinidadinternal.el.TrinidadVariableResolver.resolveVariable(TrinidadVariableResolver.java:52)
| at com.sun.facelets.el.LegacyELContext$LegacyELResolver.getValue(LegacyELContext.java:134)
| at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:68)
| at com.sun.el.parser.AstValue.getValue(AstValue.java:107)
| at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:192)
| at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
| at com.sun.facelets.el.LegacyValueBinding.getValue(LegacyValueBinding.java:56)
| at javax.faces.component.UIData.getValue(UIData.java:1023)
| at org.apache.myfaces.component.html.ext.HtmlDataTableHack.createDataModel(HtmlDataTableHack.java:437)
| at org.apache.myfaces.component.html.ext.HtmlDataTable.createDataModel(HtmlDataTable.java:847)
| at org.apache.myfaces.component.html.ext.HtmlDataTableHack.getDataModel(HtmlDataTableHack.java:414)
| at org.apache.myfaces.component.html.ext.HtmlDataTable.getDataModel(HtmlDataTable.java:839)
| at org.apache.myfaces.component.html.ext.HtmlDataTableHack.getRowCount(HtmlDataTableHack.java:87)
| at javax.faces.component.UIData.processColumnChildren(UIData.java:689)
| at javax.faces.component.UIData.processDecodes(UIData.java:585)
| at org.apache.myfaces.component.html.ext.HtmlDataTable.processDecodes(HtmlDataTable.java:293)
| at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:605)
| at javax.faces.component.UIForm.processDecodes(UIForm.java:56)
| at org.ajax4jsf.framework.ajax.AjaxViewRoot.processDecodes(AjaxViewRoot.java:353)
| at org.apache.myfaces.lifecycle.ApplyRequestValuesExecutor.execute(ApplyRequestValuesExecutor.java:32)
| at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:95)
| at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:70)
| at javax.faces.webapp.FacesServlet.service(FacesServlet.java:139)
| at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
| at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147)
| at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
| at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._invokeDoFilter(TrinidadFilterImpl.java:326)
| at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:290)
| at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:213)
| at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:90)
| at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
| at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:75)
| at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:213)
| at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
| at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at org.jboss.seam.servlet.SeamExceptionFilter.doFilter(SeamExceptionFilter.java:46)
| at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
| at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:32)
| at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
| at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
| at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
| at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
| at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
| at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
| at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
| at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
| at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
| at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
| at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
| at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
| at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
| at java.lang.Thread.run(Thread.java:595)
| Caused by: java.lang.InstantiationException: com.ga.riskapp.session.GASession
| at java.lang.Class.newInstance0(Class.java:335)
| at java.lang.Class.newInstance(Class.java:303)
| at org.jboss.seam.Component.instantiateJavaBean(Component.java:1045)
| at org.jboss.seam.Component.instantiate(Component.java:1008)
| at org.jboss.seam.Component.newInstance(Component.java:1718)
| ... 60 more
Here is the action class code snippet:
| @Name("detailsearch")
| @Scope(ScopeType.CONVERSATION)
| @GALoggedIn
| public class GAAccountDetailsAction {
|
| @In
| private Session gadb;
| @In
| private GAHostAppInfo hostApp;
| @In
| private FacesMessages facesMessages;
| @Logger
| private Log log;
| @DataModel
| private List<GASession> sessionList;
| @DataModelSelection
| @In(required=false) @Out(required=false)
| private GASession selectedSession;
|
| public void applyScale1() {
| try {
| this.scale = 1;
| getSessions();
| } catch (Throwable t) {
| log.error("Error while applying scale", t);
| facesMessages.addFromResourceBundle(Constants.APPLICATION_ERROR);
| }
| }
| ...
| }
Here is the GASession class:
@Name("selectedSession")
| @Scope(ScopeType.CONVERSATION)
| public class GASession {
| ...
| }
|
Anyone knows why such an exception thrown? When I accessed the debug page, I saw the "selectedSession" object existed in the "detailsearch". So, I am not sure why such an exception thrown.
Thanks.
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