Spring Data REST, cannot save, can select - spring

Question

I'm puzzled as to why my Spring Data REST code was working, but not anymore. Probably a configuration issue, but I can't point my finger to what. When I use AJAX to post to a endpoint, I get a 500 error - java.lang.IllegalArgumentException: argument type mismatch. When I try repository.save() from independent java, I get no response. On the other hand, when I perform a get to my API or call repository.find(), I can see Hibernate showing selects happening. So I know that my database is connected. Additionally, I'm using Flyway and those scripts are able to insert without issue.
I'm using Spring-Boot-Starter for Data-REST, Data-JPA, and thymeleaf, all Version 1.2.1.RELEASE. I recognize that this could be a version issue, but I'm keeping it here to eventually integrate with Spring-Security-Kerberos, which I know works with that version of Spring-Boot. At least, I haven't gotten it to work with a later version of Spring-Boot.
Some things I have noticed that may or may not be related:
#Transactional on top my #RestRepositoryResource makes no difference
When calling repository.save(), the returned entity's ID stays at 0 (I'm Auto generation on my entities)
The problem exists on all my entities, including ones without any relations
It didn't matter that I removed unique=true from one of my entities
One of my Repository Interfaces
#RepositoryRestResource(collectionResourceRel = "shifts", path = "shifts")
public interface ShiftRepository extends PagingAndSortingRepository<Shift, Long> {
List<Shift> findBySiteId(#Param("siteId") String siteId);
Shift findByShiftCode(#Param("shiftCode") String shiftCode);
}
My Repository Config Component
#Component
public class RepositoryConfigDev {
#Value("${spring.datasource.driver-class-name}")
private String driverClassName;
#Value("${spring.datasource.url}")
private String url;
#Value("${spring.datasource.username}")
private String username;
#Value("${spring.datasource.password}")
private String password;
#Bean
EventHandler eventHandler() {
return new EventHandler();
}
#Bean
DataSource dataSource() {
DriverManagerDataSource ds = new DriverManagerDataSource();
ds.setDriverClassName(driverClassName);
ds.setUrl(url);
ds.setUsername(username);
ds.setPassword(password);
return ds;
}
#Bean
public JpaVendorAdapter jpaVendorAdapter() {
HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
adapter.setDatabase(Database.SQL_SERVER);
adapter.setDatabasePlatform("org.hibernate.dialect.SQLServer2012Dialect");
adapter.setShowSql(true);
adapter.setGenerateDdl(false);
return adapter;
}
#Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean emfb = new LocalContainerEntityManagerFactoryBean();
emfb.setJpaVendorAdapter(jpaVendorAdapter());
emfb.setDataSource(dataSource());
emfb.setPackagesToScan("package.model");
emfb.afterPropertiesSet();
return emfb;
}
#Bean
public PlatformTransactionManager transactionManager() {
JpaTransactionManager txManager = new JpaTransactionManager();
txManager.setEntityManagerFactory(entityManagerFactory().getObject());
txManager.setRollbackOnCommitFailure(true);
return txManager;
}
}

Answer 1

So after rebuilding from scratch, I figured out what I did wrong. The problem was in the #RepositoryEventHandler. In that I had originally declared the class as
#RepositoryEventHandler(value={Class1.class, Class2.class})
public class RepoEvents {
....
}
When it should have been
#RepositoryEventHandler
public class RepoEvents {
#HandleBeforeCreate(Class1.class)
public void beforeCreate1(Class1 c) { ... }
#HandleBeforeCreate(Class2.class)
public void beforeCreate2(Class2 c) { ... }
}