在hibernate中持久化对象时，事务正在回滚

时间：2018-02-09 12:53:10

标签： java hibernate jpa

我有以下代码来保存Oracle中的数据。

TRACE org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction - Adding resolved non-early insert action.
09-02-2018 15:14:54.273 TRACE org.hibernate.engine.internal.Cascade.cascade - Processing cascade ACTION_MERGE for: com.fis.cdpr.model.DataCollection
09-02-2018 15:14:54.273 TRACE org.hibernate.engine.internal.Cascade.cascade - Done processing cascade ACTION_MERGE for: com.fis.cdpr.model.DataCollection
09-02-2018 15:14:54.273 TRACE org.hibernate.engine.spi.CascadingAction.cascade - Cascading to merge: com.fis.cdpr.model.Language
09-02-2018 15:14:54.274 TRACE org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached - Merging detached instance
09-02-2018 15:14:54.274 TRACE org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad - Loading entity: [com.fis.cdpr.model.Language#06]
09-02-2018 15:14:54.274 TRACE org.hibernate.event.internal.DefaultLoadEventListener.doLoad - Attempting to resolve: [com.fis.cdpr.model.Language#06]
09-02-2018 15:14:54.274 TRACE org.hibernate.event.internal.DefaultLoadEventListener.doLoad - Resolved object in session cache: [com.fis.cdpr.model.Language#06]
09-02-2018 15:14:54.274 DEBUG org.hibernate.jpa.spi.AbstractEntityManagerImpl.markForRollbackOnly - Mark transaction for rollback

当我运行上面的代码时，它给我的事务回滚以下是日志

Language

我已经覆盖 Language lang1 = new Language(); lang1.setLangCode("06"); Language lang2 = new Language(); lang2.setLangCode("06"); em.merge(lang1); em.merge(lang2); 对象

的equals和hashcode

然后我尝试使用代码来检查问题并且它有效!! 

09-02-2018 16:59:44.840 TRACE org.hibernate.engine.spi.ActionQueue.addInsertAction - Adding insert with no non-nullable, transient entities: [EntityInsertAction[com.fis.cdpr.model.Language#06]]
09-02-2018 16:59:44.840 TRACE org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction - Adding resolved non-early insert action.
09-02-2018 16:59:44.842 TRACE org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached - Merging detached instance
09-02-2018 16:59:44.842 TRACE org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad - Loading entity: [com.fis.cdpr.model.Language#06]
09-02-2018 16:59:44.843 TRACE org.hibernate.event.internal.DefaultLoadEventListener.doLoad - Attempting to resolve: [com.fis.cdpr.model.Language#06]
09-02-2018 16:59:44.843 TRACE org.hibernate.event.internal.DefaultLoadEventListener.doLoad - Resolved object in session cache: [com.fis.cdpr.model.Language#06]
09-02-2018 16:59:44.847 DEBUG org.hibernate.engine.transaction.internal.TransactionImpl.commit - committing

见下面的日志：

Data

我需要理解为什么从缓存中查看语言对象之后的hibernate不能持久保存相同的语言对象（diff引用）但能够持久保存相同的对象引用以及不同的语言对象

我在Document和Language的{​​{1}}上提供了关联，如下所示

@ManyToOne(cascade= CascadeType.ALL)
@JoinColumn(name = "language_fk")
private Language language;

更新=＆GT;例外说

exception [java.lang.IllegalStateException: Multiple representations of the same entity [spring.model.Language#06] are being merged. Detached: [spring.model.Language@b588a401]; Detached: [spring.model.Language@b588a401]]

文档课

 @Entity
    public class Document {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id;

    @Column(name="doc_name", nullable=true)
    private String name;

    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn
    private Language lang;

    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn
    private Data data;


    public Data getData() {
        return data;
    }

    public void setData(Data data) {
        this.data = data;
    }

    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 Language getLang() {
        return lang;
    }

    public void setLang(Language lang) {
        this.lang = lang;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + id;
        result = prime * result + ((lang == null) ? 0 : lang.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Document other = (Document) obj;
        if (id != other.id)
            return false;
        if (lang == null) {
            if (other.lang != null)
                return false;
        } else if (!lang.equals(other.lang))
            return false;
        return true;
    }

数据类

@Entity
public class Data {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id;

    @Column(name="doc_name", nullable=true)
    private String name;

    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="doc_fk")
    private Document doc;

    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn
    private Language lang;

    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 Document getDoc() {
        return doc;
    }

    public void setDoc(Document doc) {
        this.doc = doc;
    }

    public Language getLang() {
        return lang;
    }

    public void setLang(Language lang) {
        this.lang = lang;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + id;
        result = prime * result + ((lang == null) ? 0 : lang.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Data other = (Data) obj;
        if (id != other.id)
            return false;
        if (lang == null) {
            if (other.lang != null)
                return false;
        } else if (!lang.equals(other.lang))
            return false;
        return true;
    }



}



        }

语言课

@Entity
public class Language {

    @Id
    private String langCode;

    private String language;


    public String getLangCode() {
        return langCode;
    }
    public void setLangCode(String langCode) {
        this.langCode = langCode;
    }
    public String getLanguage() {
        return language;
    }
    public void setLanguage(String language) {
        this.language = language;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((langCode == null) ? 0 : langCode.hashCode());
        result = prime * result + ((language == null) ? 0 : language.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Language other = (Language) obj;
        if (langCode == null) {
            if (other.langCode != null)
                return false;
        } else if (!langCode.equals(other.langCode))
            return false;
        if (language == null) {
            if (other.language != null)
                return false;
        } else if (!language.equals(other.language))
            return false;
        return true;
    }


}

从异常和我执行em.merge（lang）时; em.merge（lang2）我相信它有效，因为有两个单独的调用来持久化/合并数据，这就是为什么我这样做时从来没有异常。但除此之外它给出了例外。不是hibernate假设在Session中找到一个相同的对象时合并对象。 ？

0 个答案:

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