Flush all caches?

[Dain Sundstrom]

I've been trying to write some test cases using JPA and can't seem to  
find a way to get OpenJPA to flush the cached beans between  
transactions.  Basically, I've been trying to do this:

void test1() {
  cleanDB
  try {
    beginTx
    testSomething
    commitTx
  } finally {
    rollbackLeftOverTx
  }
}
void test2() {
  cleanDB
  try {
    beginTx
    testSomethingElse
    commitTx
  } finally {
    rollbackLeftOverTx
  }
}

My cleanDB code opens a direct connection to the DB and executes a  
"delete from foo".  I know I could theoretically just use JPA to  
clean the db also, but there are tests where that simply isn't possible.

I also need to know how to force JPA to not cache data between  
transactions for clustered systems.

TIA,

-dain