Could not instantiate Seam component: motorcycleCategService Problem
HI all,
I am trying to learn seam with jsf hibernate ajax by creating a simple advert application.
I used seam gen in to create a new project and generate the entity classes (i already had tables in the database).
After this i am tryign to follow the seam hotel booking example
in the online documentation and create a new action to search for soemthjing motorcycle category in my case
.
I have an action class called MotorcycleCategImpl which holds some actions. Code below:
package com.advert.sbeans;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import javax.ejb.Remove;
import javax.persistence.EntityManager;
import com.advert.ebeans.Motorcycle;
import com.advert.ebeans.Motorcyclecateg;
import com.advert.service.MotorcycleCateg;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Destroy;
import org.jboss.seam.annotations.Factory;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.datamodel.DataModel;
import org.jboss.seam.annotations.security.Restrict;
import org.jboss.seam.framework.EntityQuery;
@Name("motorcycleCategService")
@Scope(ScopeType.SESSION)
public class MotorcycleCategImpl extends EntityQuery<Motorcyclecateg> implements MotorcycleCateg {
/**
*
*/
private static final long serialVersionUID = 1L;
private String searchString;
private int pageSize = 10;
private int page = 2;
@In
private EntityManager entityManager;
@DataModel
private List<Motorcycle> motorcycleCats;
@In
private com.advert.ebeans.Motorcyclecateg motorcyclecateg;
public void find() {
page = 0;
if (motorcycleCats != null) {
motorcycleCats.clear();
}
queryMotorcycles();
}
@Factory("list")
public Map<String,Integer> getList() {
System.out.println("In-method getList");
Map<String,Integer> list = new TreeMap<String,Integer>();
list.put("one", 1);
list.put("two", 2);
return list;
}
public void it(){
System.out.println("In-method it");
}
@SuppressWarnings("unchecked")
public void queryMotorcycles() {
motorcycleCats = entityManager.createQuery(
"select * from motorcycleCateg")
.setMaxResults(pageSize)
.setFirstResult(page * pageSize).getResultList();
}
public String getSearchString() {
return searchString;
}
public void setSearchString(String searchString) {
this.searchString = searchString;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public List<Motorcycle> getMotorcycleCats() {
return motorcycleCats;
}
public void setMotorcycleCats(List<Motorcycle> motorcycleCats) {
this.motorcycleCats = motorcycleCats;
}
@Destroy
public void destroy(){
}
@Remove
public void remove (){
}
}My entity bean is as follows:
package com.advert.ebeans;
// Generated Mar 9, 2009 2:52:56 PM by Hibernate Tools 3.2.2.GA
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;
import org.hibernate.validator.Length;
import org.hibernate.validator.NotNull;
import org.jboss.seam.annotations.Name;
/**
* Motorcyclecateg generated by hbm2java
*/
@Entity
@Name("motorcyclecateg")
@Table(name = "motorcyclecateg", catalog = "advert", uniqueConstraints = @UniqueConstraint(columnNames = "category"))
public class Motorcyclecateg implements java.io.Serializable {
private Integer motorcycleCategPk;
private String category;
private Set<Motorcycle> motorcycles = new HashSet<Motorcycle>(0);
public Motorcyclecateg() {
}
public Motorcyclecateg(String category) {
this.category = category;
}
public Motorcyclecateg(String category, Set<Motorcycle> motorcycles) {
this.category = category;
this.motorcycles = motorcycles;
}
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "motorcycleCategPK", unique = true, nullable = false)
public Integer getMotorcycleCategPk() {
return this.motorcycleCategPk;
}
public void setMotorcycleCategPk(Integer motorcycleCategPk) {
this.motorcycleCategPk = motorcycleCategPk;
}
@Column(name = "category", unique = true, nullable = false, length = 100)
@NotNull
@Length(max = 100)
public String getCategory() {
return this.category;
}
public void setCategory(String category) {
this.category = category;
}
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "motorcyclecateg")
public Set<Motorcycle> getMotorcycles() {
return this.motorcycles;
}
public void setMotorcycles(Set<Motorcycle> motorcycles) {
this.motorcycles = motorcycles;
}
}Now i have a simple xhtml page from where i am trying to call the find method from the MotorcycleCategImpl class (as done the seam documentation roughly).
My xhtml page searchMotorcycles is as follows:
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:s="http://jboss.com/products/seam/taglib"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:rich="http://richfaces.org/rich"
xmlns:a4j="https://ajax4jsf.dev.java.net/ajax"
xmlns:a="http://richfaces.org/a4j"
template="layout/template.xhtml">
<ui:define name="body">
<h:form id="searchCriteria">
<fieldset>
<h:inputText id="searchString" value="#{motorcycleCategService.searchString}"
style="width: 165px;">
<a:support event="onkeyup" actionListener="#{motorcycleCategService.find}"
reRender="searchResults" />
</h:inputText>
 
<a:commandButton id="findMotorcycles" value="find Motorcycles" action="#{motorcycleCategService.find}"
reRender="searchResults"/>
 
<a:status>
<f:facet name="start">
<h:graphicImage value="/img/spinner.gif"/>
</f:facet>
</a:status>
<br/>
<h:outputLabel for="pageSize">Maximum results:</h:outputLabel> 
<h:selectOneMenu value="#{hotelSearch.pageSize}" id="pageSize">
<f:selectItem itemLabel="5" itemValue="5"/>
<f:selectItem itemLabel="10" itemValue="10"/>
<f:selectItem itemLabel="20" itemValue="20"/>
</h:selectOneMenu>
</fieldset>
</h:form>
<a:outputPanel id="searchResults">
<div class="section">
<h:outputText value="No Hotels Found"
rendered="#{motorcycleCats != null and motorcycleCats.rowCount==0}"/>
<h:dataTable id="hotels" value="#{motorcycleCats}" var="motorcyclecateg"
rendered="#{motorcycleCats.rowCount>0}">
<h:column>
<f:facet name="header">Name</f:facet>
#{hot.name}
</h:column>
<h:column>
<f:facet name="header">Action</f:facet>
<s:link id="viewHotel" value="View Hotel"
action="#{motorcycleCats.selectHotel(motorcyclecateg)}"/>
</h:column>
</h:dataTable>
<s:link value="More results" action="#{motorcycleCats.nextPage}"
rendered="#{motorcycleCats.nextPageAvailable}"/>
</div>
</a:outputPanel>
</ui:define>
</ui:composition>
Now the problem is that as soon i try to load the above page i get the following error:
Could not instantiate Seam component: motorcycleCategService
Any help would be appreciated. Find the stack trace below:
org.jboss.seam.InstantiationException: Could not instantiate Seam component: motorcycleCategService at org.jboss.seam.Component.newInstance(Component.java:2106) at org.jboss.seam.Component.getInstance(Component.java:1988) at org.jboss.seam.Component.getInstance(Component.java:1950) at org.jboss.seam.Component.getInstance(Component.java:1944) at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55) at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50) at org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166) at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53) at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53) at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72) at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44) at org.jboss.el.parser.AstValue.getValue(AstValue.java:63) at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71) at javax.faces.component.UIOutput.getValue(UIOutput.java:184) at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:201) at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:284) at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:154) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:946) at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:936) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:942) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592) at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108) at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:196) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:109) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:177) at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:267) at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:380) at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:507) at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 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:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) at java.lang.Thread.run(Unknown Source) Caused by: org.jboss.seam.RequiredException: @In attribute requires non-null value: motorcycleCategService.motorcyclecateg at org.jboss.seam.Component.getValueToInject(Component.java:2297) at org.jboss.seam.Component.injectAttributes(Component.java:1703) at org.jboss.seam.Component.inject(Component.java:1521) at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:61) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:95) at org.jboss.seam.util.Work.workInTransaction(Work.java:47) at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:89) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.SynchronizationInterceptor.aroundInvoke(SynchronizationInterceptor.java:32) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185) at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103) at com.advert.sbeans.MotorcycleCategImpl_$$_javassist_6.validate(MotorcycleCategImpl_$$_javassist_6.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.seam.util.Reflections.invoke(Reflections.java:22) at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144) at org.jboss.seam.Component.callComponentMethod(Component.java:2211) at org.jboss.seam.Component.callCreateMethod(Component.java:2134) at org.jboss.seam.Component.newInstance(Component.java:2094)
