Apparently XmlRootElement annotation added to SqlResourceDefinition is not supported by the default jaxb context, eclipselink.

This appears in stdout:

ava.lang.ClassCastException: org.restsql.core.sqlresource.SqlResourceDefinition cannot be cast to javax.xml.bind.JAXBElement
at org.restsql.core.impl.SqlResourceFactoryImpl.getSqlResource(SqlResourceFactoryImpl.java:60)
at org.restsql.core.Factory.getSqlResource(Factory.java:148)
at org.restsql.service.ResResource.executeRequest(ResResource.java:339)
at org.restsql.service.ResResource.get(ResResource.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Truncated. see log file for complete stacktrace