NullPointerException on DDL creation

yuwono · **Joined:** Thu Nov 17, 2005 5:36 am **Posts:** 3

I am trying to generate DDL schema from worked POJO classes using Hibernate Annotations. I was able to generate it using non-annotated Hibernate (hbm.xml) using the same classes.

I've tried to follow the hibernate docs and EJB3 specs, but still can't get any result.

This is the messages from eclipse console :

Code:

- Using dialect: org.hibernate.dialect.MySQLDialect
- processing extends queue
- processing collection mappings
java.lang.NullPointerException
   at org.hibernate.util.StringHelper.qualify(StringHelper.java:264)
   at org.hibernate.cfg.ToOneMappedBySecondPass.doSecondPass(ToOneMappedBySecondPass.java:38)
   at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1023)
   at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:218)
   at org.hibernate.cfg.Configuration.generateDropSchemaScript(Configuration.java:638)
   at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:94)
   at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:62)
   at com.aaa.bbb.CreateDatabase.exportTables(CreateDatabase.java:62)
   at com.aaa.bbb.CreateDatabase.main(CreateDatabase.java:12)

Any idea what might caused it?

emmanuel · **Posted:** Thu Nov 17, 2005 8:50 am

can you isolate the issue with a couple of classes and post it to JIRA?
That'd be great

yuwono · **Joined:** Thu Nov 17, 2005 5:36 am **Posts:** 3

I solved the problem.

It is because I'm not inserting other-side class (on @OneToOne relation) in my schema generator (which is not needed in non-annotated version) : AnnotationConfiguration().addAnnotatedClass(otherClass.class).addAnnotatedClass...bla....bla....

I've temporarily change the code ToOneMappedBySecondPass.java in package org.hibernate.cfg line 38 :

Code:

         throw new AnnotationException("Unknown mappedBy in: " + StringHelper.qualify(ownerEntity, ownerProperty)
               + ", referenced property unknown: "
               + StringHelper.qualify( value.getReferencedEntityName(), value.getReferencedPropertyName() )

The NullPointerException actually raised from the second StringHelper.qualify (line 40).

So I've commented line 39 & 40 to track down the problem.

Suggestion :
To made more informative errors, how about checking every null possible values (if it is null) before printed them. In this case the get getReferencedEntityName() and getReferencedPropertyName().

Thanks for the response.