内存占用小的嵌入式Java SQL数据库

I'm looking for an embedded SQL database for Java, with a small footprint. Something like SQLite, but it should be pure Java. So far I've seen HSQLDB, H2 and Apache Derby, but they're not what could be called small footprint. Ideally, the database I'm looking for would be embeddable in a J2ME application.I'm looking for an embedded SQL database for Ja