java - Derby doesn't allow isolation level to be set at TRANSACTION_SERIALIZABLE for concurrent access -

i'm using derby database , trying create db objects concurrently.

as know default isolation level in transaction_read_committed.

but don't want allow phantom reads db , hence, want set isolation level transaction_serializable.

all bit of code.

if(jdbctemplate.getdatasource().getconnection().gettransactionisolation() == connection.transaction_read_committed) {                 logger.info("the connection isolation transaction_read_committed");             }             else {                 logger.info("please set connection isolation transaction_read_committed");             }              jdbctemplate.getdatasource().getconnection().settransactionisolation(connection.transaction_serializable);             if(jdbctemplate.getdatasource().getconnection().gettransactionisolation() == connection.transaction_serializable) {                 logger.info("the connection isolation transaction_serializable");             } 

as expected, see log "the connection isolation transaction_read_committed", surprisingly dont see log "the connection isolation transaction_serializable".

also exception expecting occurs confirms isolation level not set serializable.