Mapping to Hibernate Annotations in Grails 3.0.1
How can I map a domain class to annotations in Grails 3.0.1?
The following steps didn't work for me.
Step 1 . I have created a new application with Grails 3.0.1 ( grails create-app books
).
Step 2 . As described in Mapping to Hibernate Annotations I created a new class in src/main/com/books/Book.groovy
(also tried src/main/groovy/com/books/Book.groovy
)
package com.books;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class Book {
private Long id;
private String title;
private String description;
private Date date;
@Id
@GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
Step 3 . We then registered the class with the Hibernate sessionFactory by adding the appropriate entries to the file grails-app/conf/hibernate/hibernate.cfg.xml
as follows:
<!DOCTYPE hibernate-configuration SYSTEM
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<mapping package="com.books" />
<mapping class="com.books.Book" />
</session-factory>
</hibernate-configuration>
Step 4 . After running the application ( grails run-app
), the Welcome to Grails page ( grails-app/views/index.gsp
) reports null domain classes, which means the mapping did not take effect:
- grails run-app
- Loading localhost: 8080
- Pay attention to "Domains: 0" under "ARTEFACTS"
Corresponding exception in Grails 3.0.1
If I query the above domain class the following exception is thrown
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: Book is not mapped
at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:189) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:109) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:95) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:332) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3678) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3567) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:708) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:564) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:301) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:249) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:278) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:206) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
... 40 common frames omitted
source to share
As Graham suggested, the solution is put hibernate.cfg.xml
in grails-app/conf
instead grails-app/conf/hibernate
, otherwise the configuration will not take effect. I submitted a request to reflect this in the related documentation and I hope that the update will take effect soon so that other users do not face the same issue.
source to share