Это исключение произошло только при использовании Tweet Class.Я не могу найти причину, почему я должен использовать Serializable.Я сделал отображение самостоятельно в GeneticMessage.hbm.xml.Все типы (long & Date) в Tweet Class являются базовыми типами в Hibernate (я так думаю).
На самом деле, проблему можно решить, просто внедрив Serializable для Tweet, как указано в Исключении.Но я все еще хочу знать причину.
Метод
Domain domain = (Domain) objects[0];
Query q = session.createQuery("FROM PreprocessedMessage WHERE domain = ?");
q.setEntity(0, domain);
return q.list(); // this line
Исключение:
java.lang.ClassCastException: idv.petrie.prtm.model.Tweet cannot be cast to java.io.Serializable
org.hibernate.type.CollectionType.getKeyOfOwner(CollectionType.java:381)
org.hibernate.type.CollectionType.resolve(CollectionType.java:425)
org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:139)
org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:982)
org.hibernate.loader.Loader.doQuery(Loader.java:857)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
org.hibernate.loader.Loader.doList(Loader.java:2533)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
org.hibernate.loader.Loader.list(Loader.java:2271)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:452)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
idv.petrie.prtm.model.helper.PreprocessedMessageHelper$3.execute(PreprocessedMessageHelper.java:66)
idv.petrie.prtm.util.ModelHelper.execute(ModelHelper.java:36)
idv.petrie.prtm.model.helper.PreprocessedMessageHelper.findMessageByDomain(PreprocessedMessageHelper.java:69)
idv.petrie.prtm.servlet.MessageEvaluationServlet.doGet(MessageEvaluationServlet.java:44)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722) PreprocessedMessage.java
package idv.petrie.prtm.model;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
public class PreprocessedMessage extends GeneticMessage {
private GeneticMessage message;
private Set dependencies;
private Set tokens;
public PreprocessedMessage() {
super();
}
public PreprocessedMessage(GeneticMessage message, String content) {
this();
this.setMessage(message);
this.setContent(content);
this.setDomain(message.getDomain());
}
public PreprocessedMessage(GeneticMessage message) {
this(message, message.getContent());
}
public PreprocessedMessage(GeneticMessage message,
Set dependencies) {
this(message);
this.dependencies = dependencies;
}
public static Collection convertToCollection(
Collection messages) {
Collection result = new HashSet();
for (GeneticMessage message : messages) {
result.add(new PreprocessedMessage(message));
}
return result;
}
public void setMessage(GeneticMessage message) {
this.message = message;
}
public GeneticMessage getMessage() {
return message;
}
public Set getDependencies() {
return dependencies;
}
public void setDependencies(Set dependencies) {
for (Dependency d : dependencies) {
d.setMessage(this);
}
this.dependencies = dependencies;
}
public Collection getTokens() {
return tokens;
}
public void setTokens(Set tokens) {
for (Token t : tokens) {
t.setMessage(this);
}
this.tokens = tokens;
}
}
Tweet.java
package idv.petrie.prtm.model;
import java.util.Date;
public class Tweet extends GeneticMessage {
private long tweetId;
private Date createdAt;
private long fromUserId;
public Tweet() {
super();
}
public Tweet(String content) {
this();
setContent(content);
}
public Date getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
public long getFromUserId() {
return fromUserId;
}
public void setFromUserId(long fromUserId) {
this.fromUserId = fromUserId;
}
public void setTweetId(long tweetId) {
this.tweetId = tweetId;
}
public long getTweetId() {
return tweetId;
}
}
GeneticMessage.java
package idv.petrie.prtm.model;
import java.util.Date;
public class GeneticMessage implements Comparable {
public enum Status {
NEW(0), PREPROCESSED(1);
private int id;
private Status(int id) {
this.id = id;
}
public int getId() {
return id;
}
}
private long id;
private Date modifiedAt;
private String content;
private Status status;
private Domain domain;
public GeneticMessage() {
setModifiedAt();
setStatus(Status.NEW);
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public void setModifiedAt() {
this.modifiedAt = new Date();
}
public Date getModifiedAt() {
return modifiedAt;
}
public void setStatus(Status status) {
this.status = status;
}
public Status getStatus() {
return status;
}
public void setDomain(Domain domain) {
this.domain = domain;
}
public Domain getDomain() {
return domain;
}
public int compareTo(GeneticMessage o) {
String content = this.getContent();
String anotherContent = o.getContent();
return content.compareTo(anotherContent);
}
public void setModifiedAt(Date modifiedAt) {
this.modifiedAt = modifiedAt;
}
}
GeneticMessage.hbm.xml
<code>
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<typedef class="idv.petrie.prtm.model.GeneticMessage.Status"
name="Status">
<param name="enumClassName">idv.petrie.prtm.model.GeneticMessage.Status</param>
<param name="identifierMethod">getId</param>
</typedef>
<class name="idv.petrie.prtm.model.GeneticMessage">
<id name="id">
<generator class="native" />
</id>
<property name="modifiedAt" />
<property name="content" />
<property name="status" />
<many-to-one name="domain" class="idv.petrie.prtm.model.Domain"
cascade="all" outer-join="true" />
<joined-subclass name="idv.petrie.prtm.model.PreprocessedMessage">
<key />
<many-to-one name="message" class="idv.petrie.prtm.model.GeneticMessage"
outer-join="true" />
<set name="dependencies" cascade="save-update" inverse="true">
<key property-ref="message" />
<one-to-many class="idv.petrie.prtm.model.Dependency" />
</set>
<set name="tokens" cascade="save-update" inverse="true">
<key property-ref="message" />
<one-to-many class="idv.petrie.prtm.model.Token" />
</set>
</joined-subclass>
<joined-subclass name="idv.petrie.prtm.model.Tweet">
<key />
<property name="tweetId" unique="true" />
<property name="createdAt" />
<property name="fromUserId" />
</joined-subclass>
</class>
</hibernate-mapping>
</code>