Hello,
I don't know why it will raise the "Cannot simultaneously fetch multiple bags"
exception, please help and teach me how can I solve the problem?
| @Entity
| @Table(name="EventNotes")
| public class Notes implements Serializable {
| public static final long serialVersionUID = 1L;
|
| protected long id;
| protected User creator;
|
|
| /**
| * @return the creator
| */
| @ManyToOne( cascade = {CascadeType.PERSIST, CascadeType.MERGE} )
| @JoinTable(name="USER_NOTES",
| joinColumns = @JoinColumn(name="NOTES_ID"),
| inverseJoinColumns = @JoinColumn(name="USER_ID")
| )
| public User getCreator() {
|
| return this.creator;
| }
|
| /**
| * @param creator the creator to set
| */
| public void setCreator(User creator) {
|
| this.creator = creator;
| }
|
|
|
| /**
| * @return the id
| */
| @Id
| @GeneratedValue(strategy = GenerationType.AUTO)
| public long getId() {
|
| return this.id;
| }
|
| /**
| * @param id the id to set
| */
| public void setId(long id) {
|
| this.id = id;
| }
|
|
| }
|
| @Entity
| @Table(name="USERS")
| public class User implements Serializable {
| public static final long serialVersionUID = 1L;
|
| private String username;
|
| private String password;
|
|
| private String firstName;
| private String lastName;
| private String displayName;
| private String gender;
|
|
| private boolean activate;
|
| private Collection<Role> roles = new ArrayList<Role>();
| private Collection<Group> groups = new ArrayList<Group>();
|
|
|
|
| @Transient
| public boolean isActivate() {
| return activate;
| }
|
|
| public boolean getActivate() {
| return activate;
| }
|
| public void setActivate(boolean activate) {
| this.activate = activate;
| }
|
| public String getPassword() {
| return password;
| }
|
| public void setPassword(String password) {
| this.password = password;
| }
|
| @Id
| //@GeneratedValue(strategy = GenerationType.AUTO)
| public String getUsername() {
| return username;
| }
|
| public void setUsername(String username) {
| this.username = username;
| }
|
|
|
| public String getFirstName() {
| return firstName;
| }
|
| public void setFirstName(String firstName) {
| this.firstName = firstName;
| }
|
| public String getLastName() {
| return lastName;
| }
|
| public void setLastName(String lastName) {
| this.lastName = lastName;
| }
|
|
|
|
| public String getDisplayName() {
| return displayName;
| }
|
| public void setDisplayName(String displayName) {
| this.displayName = displayName;
| }
|
|
|
|
|
| public String getGender() {
| return gender;
| }
|
| public void setGender(String gender) {
| this.gender = gender;
| }
|
| @ManyToMany(cascade = {CascadeType.REMOVE},
| fetch = FetchType.EAGER,
| targetEntity=Role.class)
| @JoinTable(
| name="USER_ROLE_LINK",
| [EMAIL PROTECTED](name="username")},
| [EMAIL PROTECTED](name="rolename")}
| )
| public Collection<Role> getRoles() {
| return roles;
| }
|
|
| public void setRoles(Collection<Role> roles) {
| this.roles = roles;
| }
|
| @Transient
| public void addRole(Role role) {
| this.roles.add(role);
| }
|
|
| @ManyToMany(cascade = {CascadeType.REMOVE},
| fetch = FetchType.LAZY,
| targetEntity=Group.class)
| @JoinTable(
| name="USER_GROUP_LINK",
| [EMAIL PROTECTED](name="username")},
| [EMAIL PROTECTED](name="groupname")}
| )
| public Collection<Group> getGroups() {
| return groups;
| }
|
|
|
| public void setGroups(Collection<Group> groups) {
| this.groups = groups;
| }
|
| @Transient
| public void addGroup(Group group) {
| groups.add(group);
| }
|
|
|
| @Transient
| public String toString() {
| StringBuffer buf = new StringBuffer();
|
| buf.append("=== " + username + "===\n");
| buf.append(displayName + "\n");
|
| Iterator rs = roles.iterator();
| while(rs.hasNext()) {
| Role r = (Role)rs.next();
| buf.append(r);
| }
|
| Iterator gs = groups.iterator();
| while(rs.hasNext()) {
| Group g = (Group)rs.next();
| buf.append(g);
| }
|
|
| return buf.toString();
| }
|
| }
|
| javax.persistence.PersistenceException: org.hibernate.HibernateException:
cannot simultaneously fetch multiple bags
| at
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:737)
| at
org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:121)
| at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
| at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33)
| at mo.reales.util.HibernateUtil.initFactory(HibernateUtil.java:40)
| at mo.reales.util.HibernateUtil.initFactory(HibernateUtil.java:35)
| at
mo.reales.web.ServiceStartupListener.contextInitialized(ServiceStartupListener.java:69)
| at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3763)
| at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4211)
| at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
| at
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
| at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
| at
org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:904)
| at
org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:867)
| at
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)
| at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)
| at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
| at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
| at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)
| at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
| at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
| at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
| at
org.apache.catalina.core.StandardService.start(StandardService.java:450)
| at
org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
| at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
| 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:585)
| at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
| at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
| Caused by: org.hibernate.HibernateException: cannot simultaneously fetch
multiple bags
| at org.hibernate.loader.BasicLoader.postInstantiate(BasicLoader.java:66)
| at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:75)
| at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:43)
| at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:33)
| at
org.hibernate.loader.entity.BatchingEntityLoader.createBatchingEntityLoader(BatchingEntityLoader.java:103)
| at
org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:1748)
| at
org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:1752)
| at
org.hibernate.persister.entity.AbstractEntityPersister.createLoaders(AbstractEntityPersister.java:2982)
| at
org.hibernate.persister.entity.AbstractEntityPersister.postInstantiate(AbstractEntityPersister.java:2975)
| at
org.hibernate.persister.entity.SingleTableEntityPersister.postInstantiate(SingleTableEntityPersister.java:690)
| at
org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:290)
| at
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294)
| at
org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:915)
| at
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:730)
| ... 30 more
|
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