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Hibernateを理解していて、HQLを理解するのが初めての方です。以下は、クエリ例外を返すDAOです。私は本当にこれに関する助けに感謝したい、私はこのサイトと公式ドキュメントを通ってきたが、まだそれを動作させることはできません。ありがとう!! FYIQueryException：コレクションを逆参照しようとする不正な試みHibernate W /サブクラスを選択する
：マッピングは.xmlファイルで、JPA
スタックトレースに切り替えることはできません。
type Exception report
message Request processing failed; nested exception is org.hibernate.QueryException: illegal attempt to dereference collection [feature0_.id.actors] with element property reference [name] [SELECT f from ar.edu.uces.progweb2.springmvc.model.Feature as f where f.name like :term or f.actors.name like :term or f.genre.name like :term order by f.name ASC ]
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.QueryException: illegal attempt to dereference collection [feature0_.id.actors] with element property reference [name] [SELECT f from ar.edu.uces.progweb2.springmvc.model.Feature as f where f.name like :term or f.actors.name like :term or f.genre.name like :term order by f.name ASC ]
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.hibernate.QueryException: illegal attempt to dereference collection [feature0_.id.actors] with element property reference [name] [SELECT f from ar.edu.uces.progweb2.springmvc.model.Feature as f where f.name like :term or f.actors.name like :term or f.genre.name like :term order by f.name ASC ]
org.hibernate.hql.internal.ast.tree.DotNode$1.buildIllegalCollectionDereferenceException(DotNode.java:68)
org.hibernate.hql.internal.ast.tree.DotNode.checkLhsIsNotCollection(DotNode.java:550)
org.hibernate.hql.internal.ast.tree.DotNode.resolve(DotNode.java:246)
org.hibernate.hql.internal.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:118)
org.hibernate.hql.internal.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:114)
org.hibernate.hql.internal.ast.HqlSqlWalker.resolve(HqlSqlWalker.java:881)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.expr(HqlSqlBaseWalker.java:1264)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.exprOrSubquery(HqlSqlBaseWalker.java:4297)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:3913)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1947)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1900)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1897)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.whereClause(HqlSqlBaseWalker.java:794)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:595)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:299)
org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:247)
org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:248)
org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:183)
org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:105)
org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:168)
org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:219)
org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:197)
org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1736)
ar.edu.uces.progweb2.springmvc.dao.FeatureDAO.search(FeatureDAO.java:98)
ar.edu.uces.progweb2.springmvc.dao.FeatureDAO$$FastClassByCGLIB$$3247faf2.invoke(<generated>)
net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
ar.edu.uces.progweb2.springmvc.dao.FeatureDAO$$EnhancerByCGLIB$$f55db758.search(<generated>)
ar.edu.uces.progweb2.springmvc.controller.AppController.buscar(AppController.java:229)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.37 logs.
HBM特集：
<?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">
<!-- Qualified Class Names -->
<hibernate-mapping default-lazy="false">
<class name="ar.edu.uces.progweb2.springmvc.model.Feature" table="feature">
<id name="id" type="int" column="id">
<generator class="native"/>
</id>
<discriminator column="feature_type" type="string"/>
<property name="name" column="name"/>
<property name="runtime" column="runtime"/>
<property name="coverImage" column="cover_image"/>
<property name="storyline" column="storyline"/>
<set name="showtimes" inverse="true" cascade="all" fetch="join">
<key column="feature_id"/>
<one-to-many class="ar.edu.uces.progweb2.springmvc.model.Showtime" entity-name="ar.edu.uces.progweb2.springmvc.model.Showtime"/>
</set>
<subclass name="ar.edu.uces.progweb2.springmvc.model.Movie" discriminator-value="M">
<set name="actors" inverse="true" cascade="all" fetch="join">
<key column="feature_id"/>
<one-to-many class="ar.edu.uces.progweb2.springmvc.model.Actor" entity-name="ar.edu.uces.progweb2.springmvc.model.Actor"/>
</set>
</subclass>
<subclass name="ar.edu.uces.progweb2.springmvc.model.Documentary" discriminator-value="D">
<many-to-one name="genre"
column="documentary_genre_id"
not-null="true" fetch="join"/>
</subclass>
</class>
</hibernate-mapping>
モデル・クラス（フィーチャー、映画、ドキュメンタリー）
機能：
public abstract class Feature {
private int id;
private String name;
private int runtime;
private byte[] coverImage;
private String storyline;
private String featureType;
private Set<Showtime> showtimes;
public abstract boolean isMovie();
public abstract boolean isDocumentary();
public Feature(){
this.showtimes = new HashSet<Showtime>();
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getRuntime() {
return runtime;
}
public void setRuntime(int runtime) {
this.runtime = runtime;
}
public byte[] getCoverImage() {
return coverImage;
}
public void setCoverImage(byte[] coverImage) {
this.coverImage = coverImage;
}
public String getStoryline() {
return storyline;
}
public void setStoryline(String storyline) {
this.storyline = storyline;
}
public String getFeatureType() {
return featureType;
}
public void setFeatureType(String featureType) {
this.featureType = featureType;
}
public Set<Showtime> getShowtimes() {
return showtimes;
}
public void setShowtimes(Set<Showtime> showtimes) {
this.showtimes = showtimes;
}
}
映画：
public class Movie extends Feature {
private Set<Actor> actors;
@Override
public boolean isMovie() {
return true;
}
public Movie(){
actors = new HashSet<Actor>();
}
}
ドキュメンタリー：
public class Documentary extends Feature{
private Genre genre;
@Override
public boolean isDocumentary(){
return true;
}
@Override
public boolean isMovie() {
return false;
}
public Documentary(){
this.genre = new Genre();
}
public Genre getGenre() {
return genre;
}
public void setGenre(Genre genre) {
this.genre = genre;
}
}
DAO：
public List<Feature> search(SearchForm sf){
StringBuffer query = new StringBuffer("SELECT f ");
Map<String, Object> params = new HashMap<>();
Session session = sessionFactory.getCurrentSession();
switch (sf.getFeatureType()){ //0: Both, 1: Commercial Film, 2: Documentary
case 0:
query.append("from Feature as f ");
if (sf.getTerm() != null && !sf.getTerm().isEmpty()){
query.append("where f.name like :term or f.actors.name like :term or f.genre.name like :term ");
params.put("term","%"+ sf.getTerm() + "%");
}
break;
case 1:
if (sf.getTerm() != null && !sf.getTerm().isEmpty()){
query.append("from Movie m left join m.actors a where (a.name like :term or m.name like :term) ");
params.put("term","%"+ sf.getTerm() + "%");
} else {
query.append("from Movie m ");
}
break;
case 2:
if (sf.getTerm() != null && !sf.getTerm().isEmpty()){
query.append("from Documentary d left join d.genre g where (g.name like :term or d.name like :term) ");
params.put("term", "%"+ sf.getTerm()+"%");
} else {
query.append("from Documentary d left join d.genre g ");
}
break;
}
switch (sf.getOrder()){
case "nameDesc":
query.append("order by f.name DESC ");
break;
default:
query.append("order by f.name ASC ");
break;
}
System.out.println("Query: " + query.toString());
Query q = session.createQuery(query.toString());
Iterator<String> iter = params.keySet().iterator();
while(iter.hasNext()){
String k = iter.next();
Object o = params.get(k);
q.setParameter(k, o);
}
q.setFirstResult(this.resultsPerPage * sf.getPage());
q.setMaxResults(this.resultsPerPage);
//System.out.println("Search OK!");
return q.list();
}