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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-10409" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-c77101a0-34bb-494e-ae4a-3c32a6192470" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10409" style="color: #3b73af; text-decoration: none">HHH-10409</a> </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="Adi1817" id="email_Adi1817" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=Adi1817" style="color:#6c797f;; color: #3b73af; text-decoration: none">Adithya Indarapu</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <span class="diffcontext">Hi,<br><br></span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">Am beginner to hibernate, while i am practicing i found a bug. Following is the description to recreate the bug.</span> <span class="diffcontext"><br><br>Note: <property name="hbm2ddl.auto">create</property><br><br>1. Create a Address class to store student Address(Attached the Address class).<br>2. Create a model class for Student in which we will use @ElementCollection annotation for the Collection to store list of addresses of a student.(Attached Student class version 1).<br>3. Create a class with main method(Attached CollectionWithHibernate.java) in which create instance for Address Class and store two addresses of a student into Student class instance.<br>4. write code to save the Student object into the database.<br><br>The above steps will create two tables in database 1. Student 2. Student_address <br>Now use @JoinTable(name="StudentAddress") above to the member variable address in Student model class(Attached Student class version 2).Now run the main method to store the Student object<br><br>when we run the main method we will get error with the following log<br><br>INFO: HHH000227: Running hbm2ddl schema export<br>Hibernate: alter table StudentAddress drop constraint FKfwck4fon84bm0xjl8abwgb2hp<br>Hibernate: drop table Student<br>Jan 03, 2016 4:43:51 PM org.hibernate.tool.hbm2ddl.SchemaExport perform<br>ERROR: HHH000389: Unsuccessful: drop table Student<br>Jan 03, 2016 4:43:51 PM org.hibernate.tool.hbm2ddl.SchemaExport perform<br>ERROR: Operation 'DROP CONSTRAINT' cannot be performed on object 'SQL160103154615490' because CONSTRAINT 'FKMDTLF7DPG8K2TK4YJR53O37NX' is dependent on that object.<br>Hibernate: drop table StudentAddress<br>Hibernate: create table Student (roll integer not null, name varchar(255), primary key (roll))<br>Jan 03, 2016 4:43:51 PM org.hibernate.tool.hbm2ddl.SchemaExport perform<br>ERROR: HHH000389: Unsuccessful: create table Student (roll integer not null, name varchar(255), primary key (roll))<br>Jan 03, 2016 4:43:51 PM org.hibernate.tool.hbm2ddl.SchemaExport perform<br>ERROR: Table/View 'STUDENT' already exists in Schema 'APP'.<br>Hibernate: create table StudentAddress (Student_roll integer not null, user_city varchar(255), user_pincode varchar(255), user_state varchar(255), user_street varchar(255))<br>Hibernate: alter table StudentAddress add constraint FKfwck4fon84bm0xjl8abwgb2hp foreign key (Student_roll) references Student<br>Jan 03, 2016 4:43:51 PM org.hibernate.tool.hbm2ddl.SchemaExport execute<br>INFO: HHH000230: Schema export complete<br>Hibernate: insert into Student (name, roll) values (?, ?)<br>Jan 03, 2016 4:43:51 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions<br>WARN: SQL Error: 20000, SQLState: 23505<br>Jan 03, 2016 4:43:51 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions<br>ERROR: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'SQL160103154615490' defined on 'STUDENT'.<br>Jan 03, 2016 4:43:51 PM org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl release<br>INFO: HHH000010: On release of batch it still contained JDBC statements<br>Jan 03, 2016 4:43:51 PM org.hibernate.internal.SessionImpl$5 mapManagedFlushFailure<br>ERROR: HHH000346: Error during managed flush [could not execute statement]<br><br><br>My Analysis:<br>In the Model class Student we have used JoinTable annotation and changed the table name to be created for foreign key(version 2 of Student class). As per hibernate.cfg.cml what ever that are mentioned in <mapping> will be dropped and will be created, so (in Student class version 2) hibernate will try to delete Student table , which will fail because there is foreign key relation between Student and Student_address table.<br>So before deleting a table Student the foreign key relation to the Student_address need to be deleted. <br><br><br><br></span> </td>
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