Question

public class Media implements java.io.Serializable {

    private int id;
    private MediaKind mediaKind;
    private String name;
    private byte[] cover;
    private Date releaseDate;
    private Integer contentRating;
    private String summary;
    private Set mediaCrews = new HashSet(0);
    private Set mediaInstances = new HashSet(0);
    private Set ratings = new HashSet(0);
    private Set genres = new HashSet(0);
    static SessionFactory mediaFactory=Main.config.buildSessionFactory();

    public Media() {
    }

    public Media(int id, MediaKind mediaKind, String name) {
        this.id = id;
        this.mediaKind = mediaKind;
        this.name = name;
        Session mediaSession = mediaFactory.getCurrentSession();

    }

    public Media(int id, MediaKind mediaKind, String name, byte[] cover,
            Date releaseDate, Integer contentRating, String summary,
            Set mediaCrews, Set mediaInstances, Set ratings, Set genres) {
        this.id = id;
        this.mediaKind = mediaKind;
        this.name = name;
        this.cover = cover;
        this.releaseDate = releaseDate;
        this.contentRating = contentRating;
        this.summary = summary;
        this.mediaCrews = mediaCrews;
        this.mediaInstances = mediaInstances;
        this.ratings = ratings;
        this.genres = genres;
    }

    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public MediaKind getMediaKind() {
        return this.mediaKind;
    }

    public void setMediaKind(MediaKind mediaKind) {
        this.mediaKind = mediaKind;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public byte[] getCover() {
        return this.cover;
    }

    public void setCover(byte[] cover) {
        this.cover = cover;
    }

    public Date getReleaseDate() {
        return this.releaseDate;
    }

    public void setReleaseDate(Date releaseDate) {
        this.releaseDate = releaseDate;
    }

    public Integer getContentRating() {
        return this.contentRating;
    }

    public void setContentRating(Integer contentRating) {
        this.contentRating = contentRating;
    }

    public String getSummary() {
        return this.summary;
    }

    public void setSummary(String summary) {
        this.summary = summary;
    }

    public Set getMediaCrews() {
        return this.mediaCrews;
    }

    public void setMediaCrews(Set mediaCrews) {
        this.mediaCrews = mediaCrews;
    }

    public Set getMediaInstances() {
        return this.mediaInstances;
    }

    public void setMediaInstances(Set mediaInstances) {
        this.mediaInstances = mediaInstances;
    }

    public Set getRatings() {
        return this.ratings;
    }

    public void setRatings(Set ratings) {
        this.ratings = ratings;
    }

    public Set getGenres() {
        return this.genres;
    }

    public void setGenres(Set genres) {
        this.genres = genres;
    }
    public static java.util.List<Media> search(String name){
        java.util.List list;
        Session sess=mediaFactory.getCurrentSession();
        sess.beginTransaction();
        Criteria criteria=sess.createCriteria(Media.class);
        criteria.add(Restrictions.like("name", "%"+name+"%"));
        list= criteria.list();
        Hibernate.initialize(list);
        sess.getTransaction().commit();
        //connection=sess.close();

        return list;

    }
    public ArrayList<MediaInstance> availableInstances(){
        //sess.beginTransaction();
        Session sess=mediaFactory.openSession();
        sess.beginTransaction();
        Criteria criteria=sess.createCriteria(MediaInstance.class);
        criteria.add(Restrictions.like("media", name));
        sess.getTransaction().commit();
        return (ArrayList<MediaInstance>)criteria.list();
        /*MediaInstance[] instances=(MediaInstance[]) mediaInstances.toArray();

        ArrayList<MediaInstance> mediaInstanceList=new ArrayList<MediaInstance>(Arrays.asList(instances));
        for(int i=0;i<mediaInstanceList.size();i++){
            MediaInstance instance=mediaInstanceList.get(i);
            if(!instance.isAvailable()|!instance.isSellable()){
                mediaInstanceList.remove(instance);
            }
        }
        //sess.getTransaction().commit();
        //sess.close();
        return mediaInstanceList;*/
    }

}

这是我的第二类mediaInstance：

public class MediaInstance implements java.io.Serializable {

    private int id;
    private MediaType mediaType;
    private Media media;
    private String price;
    private boolean available;
    private boolean sellable;
    private Set rents = new HashSet(0);
    private Set purchases = new HashSet(0);

    public MediaInstance() {
    }

    public MediaInstance(int id, MediaType mediaType, Media media,
            String price, boolean available, boolean sellable) {
        this.id = id;
        this.mediaType = mediaType;
        this.media = media;
        this.price = price;
        this.available = available;
        this.sellable = sellable;
    }

    public MediaInstance(int id, MediaType mediaType, Media media,
            String price, boolean available, boolean sellable, Set rents,
            Set purchases) {
        this.id = id;
        this.mediaType = mediaType;
        this.media = media;
        this.price = price;
        this.available = available;
        this.sellable = sellable;
        this.rents = rents;
        this.purchases = purchases;
    }

    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public MediaType getMediaType() {
        return this.mediaType;
    }

    public void setMediaType(MediaType mediaType) {
        this.mediaType = mediaType;
    }

    public Media getMedia() {
        return this.media;
    }

    public void setMedia(Media media) {
        this.media = media;
    }

    public String getPrice() {
        return this.price;
    }

    public void setPrice(String price) {
        this.price = price;
    }

    public boolean isAvailable() {
        return this.available;
    }

    public void setAvailable(boolean available) {
        this.available = available;
    }

    public boolean isSellable() {
        return this.sellable;
    }

    public void setSellable(boolean sellable) {
        this.sellable = sellable;
    }

    public Set getRents() {
        return this.rents;
    }

    public void setRents(Set rents) {
        this.rents = rents;
    }

    public Set getPurchases() {
        return this.purchases;
    }

    public void setPurchases(Set purchases) {
        this.purchases = purchases;
    }

}

当我尝试在方法criteria.list()中调用availableInstances()时，我得到了此异常。

May 27, 2014 1:22:56 PM org.hibernate.property.BasicPropertyAccessor$BasicGetter get
ERROR: HHH000122: IllegalArgumentException in class: Media, getter method of property: id
Exception in thread "main" org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of Media.id
    at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:192)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:346)
    at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4746)
    at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4465)
    at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:243)
    at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:293)
    at org.hibernate.type.EntityType.getIdentifier(EntityType.java:537)
    at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:174)
    at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1994)
    at org.hibernate.loader.Loader.bindParameterValues(Loader.java:1965)
    at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1900)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1861)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1838)
    at org.hibernate.loader.Loader.doQuery(Loader.java:909)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
    at org.hibernate.loader.Loader.doList(Loader.java:2553)
    at org.hibernate.loader.Loader.doList(Loader.java:2539)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2369)
    at org.hibernate.loader.Loader.list(Loader.java:2364)
    at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:126)
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1682)
    at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:380)
    at MediaInstance.availableInstances(MediaInstance.java:125)
    at Main.main(Main.java:24)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:169)
    ... 23 more

我使用JBoss工具从我的数据库生成类和映射文件。所以我不认为问题出在映射文件中。

Answer 1

您的条件查询似乎没有问题。您正尝试按媒体实体的实例进行过滤，但将名称作为参数传递。

尝试这样的事情：

criteria.add(Restrictions.eq("media", this));

Answer 2

第二个参数传递给静态＆＃34;喜欢＆＃34; Restrictions静态类的方法（或＆＃34; eq＆＃34;方法等）必须与第一个字符串（第一个参数）标识的字段的类型相同。在您的示例中：

criteria.add(Restrictions.like("media", name));

＆＃34;名称＆＃34;是一个字符串而＃34;媒体＆＃34; MediaInstance类的字段是Media的实例。你应该替换＆＃34; name＆＃34;使用媒体实例，甚至媒体实例本身也在执行＆＃34; availableInstances＆＃34;方法，所以：

criteria.add(Restrictions.like("media", this));

Hibernate：IllegalArgumentException：在类中：...属性的getter方法：id

2 个答案: