TOTD #30 explained how to create CRUD application using Grails and hosted using in-built Jetty servlet engine and in-memory HSQLDB database. Jetty and HSQLDB are built into Grails and allows to ...

But don't try to connect to them with JDBC in Java. It is only for relational databases, so stick with the Apache Derby and MySQL instances. JDBC connections are expensive When you learn how to ...