hibernate auto create in-memory hsqldb causes Sequence not found

I'm using hibernate as my jpa provider and want it to create a in-memory hsqldb on startup using: hibernate.hbm2ddl.auto=create

But for some reason I get exceptions like below in my logs. Things seems to work otherwise. Is it a hibernate or hsqldb problem?

I'm limited to using jpa 1 so I'm using hsqldb 1.8.0.10 and hibernate 3.3.0.SP1

This is similar to: Internal HSQL database complains about privileges

ERROR - 4. Statement.executeUpdate(drop sequence DDS_EMAIL_STATUS_SEQ) FAILED! drop sequence DDS_EMAIL_STATUS_SEQ {FAILED after 0 msec}
java.sql.SQLException: Sequence not found in statement [drop sequence DDS_EMAIL_STATUS_SEQ]
    at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
    at org.hsqldb.jdbc.jdbcStatement.fetchResult(Unknown Source)
    at org.hsqldb.jdbc.jdbcStatement.executeUpdate(Unknown Source)
    at net.sf.log4jdbc.StatementSpy.executeUpdate(StatementSpy.java:694)
    at org.apache.commons.dbcp.DelegatingStatement.executeUpdate(DelegatingStatement.java:228)
    at org.apache.commons.dbcp.DelegatingStatement.executeUpdate(DelegatingStatement.java:228)
    at org.hibernate.tool.hbm2ddl.SchemaExport.execute(SchemaExport.java:383)
    at org.hibernate.tool.hbm2ddl.SchemaExport.drop(SchemaExport.java:358)
    at org.hiber开发者_运维问答nate.tool.hbm2ddl.SchemaExport.execute(SchemaExport.java:258)
    at org.hibernate.tool.hbm2ddl.SchemaExport.create(SchemaExport.java:211)
    at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:343)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)
    at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
    at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:132)
    at org.apache.openejb.assembler.classic.PersistenceBuilder.createEntityManagerFactory(PersistenceBuilder.java:184)
    at org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:490)
    at org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:450)
    at org.apache.openejb.assembler.classic.Assembler.buildContainerSystem(Assembler.java:368)
    at org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:280)
    at org.apache.openejb.OpenEJB$Instance.(OpenEJB.java:125)
    at org.apache.openejb.OpenEJB$Instance.(OpenEJB.java:60)
    at org.apache.openejb.OpenEJB.init(OpenEJB.java:271)
    at org.apache.openejb.OpenEJB.init(OpenEJB.java:250)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.openejb.loader.OpenEJBInstance.init(OpenEJBInstance.java:36)
    at org.apache.openejb.client.LocalInitialContextFactory.init(LocalInitialContextFactory.java:71)
    at org.apache.openejb.client.LocalInitialContextFactory.init(LocalInitialContextFactory.java:53)
    at org.apache.openejb.client.LocalInitialContextFactory.getInitialContext(LocalInitialContextFactory.java:42)
    at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:667)
    at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
    at javax.naming.InitialContext.init(InitialContext.java:223)
    at javax.naming.InitialContext.(InitialContext.java:197)

Since you're using an in-memory database, it's not surprising that a sequence, like any other database object, is not there at export time. But I don't know why you get a full stacktrace like this. I just tried with a basic test case and here is what I get:

16:27:07.708 [main] DEBUG o.h.tool.hbm2ddl.SchemaExport - Unsuccessful: drop sequence MY_ENTITY_SEQ
16:27:07.709 [main] DEBUG o.h.tool.hbm2ddl.SchemaExport - Sequence not found in statement [drop sequence MY_ENTITY_SEQ]

In other words, it "fails" silently.

Maybe you could try to extend the HSQLDialect and override the following method:

protected String getDropSequenceString(String sequenceName) {
    return "drop sequence " + sequenceName;
}

into:

protected String getDropSequenceString(String sequenceName) {
    return "drop sequence " + sequenceName + " if exists";
}

Not tested though.

Here is a technique I like to use to get a fresh in-memory database each test.

@Override
public void setUp() throws Exception {
    Properties p = new Properties();
    p.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.LocalInitialContextFactory");
    p.put("movieDatabase", "new://Resource?type=DataSource");
    p.put("movieDatabase.JdbcDriver", "org.hsqldb.jdbcDriver");
    p.put("movieDatabase.JdbcUrl", "jdbc:hsqldb:mem:moviedb" + System.currentTimeMillis());
    p.put("openejb.embedded.initialcontext.close", "DESTROY");

    initialContext = new InitialContext(p);
}

@Override
protected void tearDown() throws Exception {
    initialContext.close();
}

Basically, give a unique database name by appending System.currentTimeMillis() and rebuild the embedded container for each test.

Keeps you from having to cleanup after your tests yet doesn't require a new jvm for each test.