- com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@f1f051 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: java.net.ConnectException: Connection refused: connect

STACKTRACE:

java.net.SocketException: java.net.ConnectException: Connection refused: connect
   at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
   at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:276)
   at com.mysql.jdbc.Connection.createNewIO(Connection.java:2592)
   at com.mysql.jdbc.Connection.<init>(Connection.java:1509)
   at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
   at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135)
   at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
   at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
   at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledCo

    private static EntityManagerFactory emf;

    public static void createEntityManagerFactory() throws Exception {
        Thread criarBanco = new Thread() {
            @Override           
            public void run() {
                emf = Persistence.createEntityManagerFactory("PU");
            }
        };
        criarBanco.start();
        criarBanco.join();
        if (emf == null) throw new Exception("Error while connecting to database.");
    }

    public static EntityManagerFactory getEmf() {
        return emf;
    }