The transaction isolation levels java.sql.Connection.TRANSACTION_SERIALIZABLE, java.sql.Connection.TRANSACTION_REPEATABLE_READ, java.sql.Connection.TRANSACTION_READ_COMMITTED, and java.sql.Connection.TRANSACTION_READ_UNCOMMITTED are available from a Derby database.
TRANSACTION_READ_COMMITTED is the default isolation level.
Changing the current isolation for the connection with setTransactionIsolation commits the current transaction and begins a new transaction. For more details about transaction isolation, see "Locking, concurrency, and isolation" in the Derby Developer's Guide.