int minSize = 3;
int maxSize = 5;
ManagedConnectionPool mcp = getOnePoolPrefill(minSize, maxSize, false);
BaseConnectionManager2 cm = getNoTxCM(mcp);
PreFillPoolSupport support = (PreFillPoolSupport)mcp;
support.prefill(null, null, false);
//Let pool fill
Thread.sleep(5000);
int currentSize = mcp.getConnectionCount();