@Entity(name != table_name !!!

Normally if you get "org.hibernate.hql.ast.QuerySyntaxException: is not mapped" then you used the table name in stead of the class name. In my case I'm ashamed to admit, 

I though setting @Entity(name is setting the table name,

where in fact it is setting the JPQL alias! 

I thought it was weird that you can set that and the @Table(name . 

@Entity(name != table_name !!!
@Entity(name != table_name !!!
@Entity(name != table_name !!!
@Entity(name != table_name !!!
@Entity(name != table_name !!!

@Entity(name != table_name !!!

@Entity(name != table_name !!!

@Entity(name != table_name !!!

@Entity(name != table_name !!!

@Entity(name != table_name !!!

Thanks Matt Raible for showing me the light:

If you specify a name value for your @Entity annotation (for example

@Entity(name="person")), this will be the alias for HQL queries. If you

don't specify this value, the name will match the short name of your class (

Person). If you want to change the table name that's generated, use the

@Table

(http://java.sun.com/javaee/5/docs/api/javax/persistence/Table.html) annotation

with a "name" value.

http://www.mail-archive.com/users@appfuse.dev.java.net/msg18164.html

IncompatibleClassChangeError: Implementing class

In my case this was caused by incompatible versions of hibernate in the classpath...

2010-10-19 12:40:32,271:ERROR   Problem encountered during View.servePage       - com.icesoft.faces.context.View
java.lang.IncompatibleClassChangeError: Implementing class
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:983)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1501)
        at za.co.enerweb.nampower.report.hibernate.HibernateSessionFactory.(HibernateSessionFactory.java:60)

Overheating laptop

A couple of weeks ago I could reliably get my laptop to overheat by just running the bazaar unit tests.

By googling I found that it could help to clean out the fan,
so I opened it a bit but gave up because I didn't have time to open it up completely.

Recently it got much worse, I could not even open eclipse without having a household fan directed at my laptop.

I decided today is the day. I had to remove about 30 screws and the processing unit heat sinks to get at them little radiators. They were a bit filthy of coarse, but its all cleaned now. I had to file off 1mm of a 3mm flat screwdriver bit so that I can unscrew about 11 2mm hexagonal screws.. . One screw got lost somewhere, I hope its not stuck somewhere where it can cause problems - that must be what doctors think if they are missing something after performing surgery.

It seems much better now, the fan doesn't even come on so often any more.

inconsistent datatypes with JPA.. eish

I've been having some weird errors with JPA eg.
(pasted here so you can find it with google)

==
INFO - batching 1 statements: 1: insert into dds.DDS_EMAIL_STATUS (DOC_REGISTER_ID, EMAIL_ADDRESS_FROM,
EMAIL_ADDRESS_TO, LAST_UPDATE_TIME, MESSAGE_ID, SEND_DATETIME, STATUS_ID, SUBJECT, DDS_EMAIL_STATUS_ID)
values (1001, 'dds-test@example.com', 'test@example.com', to_date('10/12/2010 12:41:05', 'mm/dd/yyyy
hh24:mi:ss'), NULL, to_date('10/12/2010 12:41:05', 'mm/dd/yyyy hh24:mi:ss'), 0, 'testSend',
800)  {executed in 4 msec}
INFO - executeBatch()
ERROR - 2. PreparedStatement.executeBatch() batching 2 statements:
1:  insert into dds.DDS_EMAIL_STATUS_LOG (DATE_TIME, DDS_EMAIL_STATUS_ID, MESSAGE, DDS_EMAIL_STATUS_LOG_ID) values (to_date('10/12/2010 12:41:05', 'mm/dd/yyyy hh24:mi:ss'), '', 'html body:
html body', 750)
java.sql.BatchUpdateException: ORA-00932: inconsistent datatypes: expected NUMBER got BINARY
    at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:343)
    at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10720)
    at net.sf.log4jdbc.StatementSpy.executeBatch(StatementSpy.java:523)
    at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
    at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)
    at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:304)
    at org.apache.openejb.persistence.JtaEntityManager.flush(JtaEntityManager.java:130)
==
java.sql.SQLException: incompatible data types in combination in statement [alter table DDS_EMAIL_STATUS_LOG add constraint FKB7F2A8E6BAAD6FBB foreign key (DDS_EMAIL_STATUS_ID) references DDS_EMAIL_STATUS]
 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.create(SchemaExport.java:341)
 at org.hibernate.tool.hbm2ddl.SchemaExport.execute(SchemaExport.java:262)
 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)
...
Caused by: org.hsqldb.HsqlException: incompatible data types in combination
 at org.hsqldb.error.Error.error(Unknown Source)
 at org.hsqldb.error.Error.error(Unknown Source)
 at org.hsqldb.Table.checkColumnsMatch(Unknown Source)
 at org.hsqldb.TableWorks.checkCreateForeignKey(Unknown Source)
 at org.hsqldb.TableWorks.addForeignKey(Unknown Source)
 at org.hsqldb.ParserDDL.processAlterTableAddForeignKeyConstraint(Unknown Source)
 at org.hsqldb.ParserDDL.processAlterTable(Unknown Source)
 at org.hsqldb.ParserDDL.processAlter(Unknown Source)
 at org.hsqldb.StatementSchema.getResult(Unknown Source)
 at org.hsqldb.StatementSchema.execute(Unknown Source)
 at org.hsqldb.Session.executeCompiledStatement(Unknown Source)
 at org.hsqldb.Session.executeDirectStatement(Unknown Source)
 at org.hsqldb.Session.execute(Unknown Source)
==
javax.persistence.PersistenceException: org.hibernate.type.SerializationException: could not deserialize
    at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)
    at org.hibernate.ejb.AbstractEntityManagerImpl.remove(AbstractEntityManagerImpl.java:259)
    at org.apache.openejb.persistence.JtaEntityManager.remove(JtaEntityManager.java:107)
==
1:  update DDS_EMAIL_STATUS_LOG set DATE_TIME='10/12/2010 13:11:54.206', DDS_EMAIL_STATUS_ID='', MESSAGE='text body:
text body' where DDS_EMAIL_STATUS_LOG_ID=1 {FAILED after 0 msec}
java.sql.BatchUpdateException: data exception: string data, right truncation
 at org.hsqldb.jdbc.JDBCPreparedStatement.executeBatch(Unknown Source)
 at net.sf.log4jdbc.StatementSpy.executeBatch(StatementSpy.java:523)
 at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
 at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
 at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168)
==

I tried different databases because it looked to me like the hsqldb is getting a bit confused with the column order. But in the end it turned out that I made a bit of a mistake:
I converted an embedded complex primary key to have a generated Id. In stead of annotating the referenced object with a @ManyToOne(optional = false)
it was still using @Column(name = "DDS_EMAIL_STATUS_ID"). After much debugging, googling and figuring out how to print the actual sql using http://code.google.com/p/log4jdbc-remix/ I figured out that I neglegted to change @Column to @ManyToOne.

Why is nothing ever easy ;-P

eclipse + tomcat + maven pain again

Banging my head against the wall again today
because my app just does not want to start up :'(
Between eclipse, tomcat and maven my classpath was messed up, getting all sorts of exceptions like NoClassDefFoundError etc.

Finally I figured out again that for each project involved you have to check "Maven Dependencies"
in the "Order and Export" tab of the Java build path settings.
Then when you tell tomcat to include these projects,
it will actually include it and its dependencies.

I'm not sure how this got lost because my app used to work. Maybe when I imported the same project in
another workspace that got reset :(