由于序列问题,我无法保留任何实体.我使用Glssfish 4,Postgres 9.3 JPA EJB3和Netbeans 8.
在兴奋之下:
在兴奋之下:
Finest: persist() operation called on: MyUser{id=null,email=a@e.it,password=test,firstname=test,lastname=test,company=Test}. Finest: Execute query ValueReadQuery(sql="select nextval('mom_seq_id')") Finest: Connection acquired from connection pool [read]. Finest: reconnecting to external connection pool Fine: select nextval(mom_seq_id) Finest: Connection released to connection pool [read]. Warning: Local Exception Stack: Exception [EclipseLink-7027] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.ValidationException Exception Description: The sequence named [mom_seq_id] is setup incorrectly. Its increment does not match its pre-allocation size. at org.eclipse.persistence.exceptions.ValidationException.sequenceSetupIncorrectly(ValidationException.java:1604) at org.eclipse.persistence.sequencing.StandardSequence.createVector(StandardSequence.java:96) ...
Postgres上的序列:
CREATE SEQUENCE my_seq_id INCREMENT 1 MINVALUE 1 MAXVALUE 9223372036854775807 START 27 CACHE 1; ALTER TABLE my_seq_id OWNER TO postgres; COMMENT ON SEQUENCE my_seq_id IS 'Sequence for autoincrement id on MyClass';
以及我的实体的摘录:
@Entity @Table(name = "myuser") @XmlRootElement public class MyUser implements Serializable { private static final long serialVersionUID = 1L; @Id @SequenceGenerator(name="MYSEQ",sequenceName="my_seq_id") @GeneratedValue(strategy = GenerationType.SEQUENCE,generator="MYSEQ") @Basic(optional = false) @Column(name = "id") private Integer id;
任何人都可以解释什么是错的?
谢谢
我解决了我的问题,但我不知道为什么!我看到allocationSize()的默认值是50:
package javax.persistence; @Target(value = {ElementType.TYPE,ElementType.METHOD,ElementType.FIELD}) @Retention(value = RetentionPolicy.RUNTIME) public @interface SequenceGenerator { public String name(); public String sequenceName() default ""; public String catalog() default ""; public String schema() default ""; public int initialValue() default 1; public int allocationSize() default 50; }
我已将我的Postgres序列increment_by值从1更新为50,现在它可以工作了!
解决方法
将INCREMENT的值从1改为50到我的Postgres序列解决了这个问题.正如@unwichtich所建议的那样,通过@SequenceGenerator注释指定allocationSize = 50属性是个好主意.