null pointer exception in Seam conversation using <s:convert
Hi , I searched the Seam forum for this problem but did not find exactly this case . I get the following exception navigating my web app that includes a dropdown list . I can go the the page with the dropdown list and save to the database but when I go to the next page and try to return to the dropdown I get the null pointer exception (sometimes) . Not sure how to proceed??? I really like Seam and would like to fix this problem .
java.lang.NullPointerException at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOption(MenuRenderer.java:580) at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:757) at com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:811) at com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:335) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:833) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:896) at javax.faces.render.Renderer.encodeChildren(Renderer.java:137) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:809) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:577) at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108) at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:233) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106) at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245) 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$FilterChainImpl.doFilter(SeamFilter.java:83) at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:63) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:127) at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:277) at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:40) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140) 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:179) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:595)
page :
<h:form id="orgProfile1">
<h1>Register Organization Profile</h1>
<hr/>
<h:outputLabel for="orgType" value="#{messages.orgType}"/>
<h:selectOneMenu value="#{organization.type}" id="orgType">
<s:selectItems value="#{orgTypeList}" var="type" label="#{type.type}" noSelectionLabel="Select your type"/>
<s:convertEntity/>
</h:selectOneMenu>
<h:commandButton type="submit" value="Save" action="#{profile.save}"/>
</h:form>
package ca.gc.acdi_cida;
import ....
@Stateful
@Name("profile")
public class OrganizationalProfileAction implements OrganizationalProfile {
@In (required=false)
@Out (required=false)
private Organization organization ;
@Out (required=false)
private List<OrganizationalType> orgTypeList;
@In(create=true)
private EntityManager entityManager;
@Begin(join=true)
@SuppressWarnings("unchecked")
@Factory( "orgTypeList" )
public void findOrgTypes() {
System.out.println( " -------------------- Retrieving types..." );
orgTypeList = entityManager.createQuery("from OrganizationalType ").getResultList();
System.out.println(" ------------------ orgTypeList size : "+ orgTypeList.size());
}
@End
public String save(){
entityManager.persist(organization);
organization = new Organization();
return null;
}
@Remove @Destroy
public void destroy() {}
}
package ca.gc.acdi_cida;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import org.jboss.seam.annotations.Name;
@Entity
@Name("organization")
public class Organization implements Serializable {
private static final long serialVersionUID = 1L;
private Integer id;
private OrganizationalType type;
public Organization(OrganizationalType type) {
this.type = type;
}
public Organization() {}
@Id @GeneratedValue
public Integer getId() {return id;}
public void setId(Integer id) {this.id = id;}
@ManyToOne
public OrganizationalType getType() {return type;}
public void setType(OrganizationalType type) {
System.out.println(" ------------ Type : " + type);
this.type = type;
}
}
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import org.jboss.seam.annotations.Name;
@Entity
@Name("organizationalType")
public class OrganizationalType implements Serializable{
/**
*
*/
private static final long serialVersionUID = 2490845589570967280L;
private String type ;
private Integer id;
public OrganizationalType(){}
public OrganizationalType(String type) {
this.type = type;
}
@Id @GeneratedValue
public Integer getId() {return id;}
public void setId(Integer id) {this.id = id;}
public String getType() {return type;}
public void setType(String type) {this.type = type;}
}
components.xml
<persistence:managed-persistence-context name="entityManager" auto-create="true" persistence-unit-jndi-name="java:/hopeEntityManagerFactory"/>
persistence.xml
<?xml version="1.0" encoding="UTF-8"?> <!-- Persistence deployment descriptor for dev profile --> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="hope"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <jta-data-source>java:/DefaultDS</jta-data-source> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect" /> <property name="hibernate.transaction.flush_before_completion" value="true" /> <property name="hibernate.hbm2ddl.auto" value="create-drop" /> <property name="hibernate.show_sql" value="true" /> <property name="jboss.entity.manager.factory.jndi.name" value="java:/hopeEntityManagerFactory"/> </properties> </persistence-unit> </persistence>