Spring déserialization d'un bean
Bonjour,
J'ai suivi le tutoriel d'Alexis Hassler (LIEN ICI) montrant la création d'une petite application web intégrant JSF+Spring+Hibernate. A la fin de son exemple, il crée un bean JSF courseBean possédant un objet CourseService qui lui est injecté par Spring lors de sa création (c.f. plus bas). Seulement cet objet est déclaré comme transient. Celà pose donc problème si on arrête le serveur (TomCat), car lors du redémarrage de ce dernier, les session beans vont être désérialisés et courseService va être assigné à null. Toutes les personnes ayant une session active durant le redémarrage du serveur vont donc avoir un joli NullPointerException lorsqu'elles utilisent cet objet (ici la méthode update()). De l'autre côté si on ne déclare pas le champs comme transient, on aura une erreur de TomCat qui n'arrive pas à restaurer l'objet.. (c.f plus bas) Comment peut-on faire pour que Spring "reWire" notre objet courseService lors de sa déserialization? Je pensait redéfinir la méthode readObject(ObjectInputStream in) de CourseBean et recréer moi même l'objet CourseService via Spring, mais mes notions de Spring et JSF sont très très fraiches et je ne sais pas si une telle chose est possible :-) Qqn pourrait-il m'aider?
Bean JSF:
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| @Component("courseBean")
@Scope("session")
public class CourseBean implements Serializable {
private static final long serialVersionUID = 34L;
@Autowired
private transient CourseService courseService; /* ICI = objet déclaré transient */
private transient HtmlScrollableDataTable courseTable;
private List<Course> courseList;
private Course currentCourse;
@PostConstruct
public void init(){
courseList = courseService.findAll();
}
/* Navigation Methods */
public String viewNew() {
currentCourse = new Course();
return "detail";
}
public String viewDetail() {
List<Course> valueList = (List<Course>)courseTable.getValue();
Iterator keys = courseTable.getSelection().getKeys();
/* At least one elem has been selected */
if(keys.hasNext()){
courseTable.setRowKey(keys.next());
currentCourse = (Course)courseTable.getRowData();
return "detail";
}
return null;
}
public String update(){
courseService.save(currentCourse);
init();
return null;
}
/* Getter/Setter */
/* ... (Supprimé) */
} |
Exception générée lorsqu'on enlève le mot clef transient:
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| GRAVE: Exception au chargement des sessions depuis le stockage persistant (persistent storage)
java.lang.IllegalStateException: Cannot deserialize BeanFactory with id org.springframework.web.context.WebApplicationContext:/university: no factory registered for this id
at org.springframework.beans.factory.support.DefaultListableBeanFactory$SerializedBeanFactoryReference.readResolve(DefaultListableBeanFactory.java:972)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1061)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1761)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:479)
at org.springframework.aop.support.AbstractBeanFactoryPointcutAdvisor.readObject(AbstractBeanFactoryPointcutAdvisor.java:98)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1666)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1322)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:479)
at org.springframework.aop.framework.AdvisedSupport.readObject(AdvisedSupport.java:550)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:479)
at ch.elca.university.web.CourseBean.readObject(CourseBean.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1475)
at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:977)
at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:394)
at org.apache.catalina.session.StandardManager.load(StandardManager.java:321)
at org.apache.catalina.session.StandardManager.start(StandardManager.java:643)
at org.apache.catalina.core.ContainerBase.setManager(ContainerBase.java:438)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4559)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) |
