Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user ''@'localhost' to database 'hibernate'
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
  at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
  at com.mysql.jdbc.Util.getInstance(Util.java:360)
  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:978)
  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:870)
  at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1659)
  at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1206)
  at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2234)
  at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2265)
  at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
  at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)
  at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
  at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
  at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:395)
  at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
  at bitronix.tm.resource.jdbc.lrc.LrcXADataSource.getXAConnection(LrcXADataSource.java:104)
  ... 33 more

ds.setClassName("bitronix.tm.resource.jdbc.lrc.LrcXADataSource");
          ds.getDriverProperties().put(
              "url",
              connectionURL != null ? connectionURL
                  : "jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull"
          );
          Properties dp=ds.getDriverProperties();
          dp.put("driverClassName", "com.mysql.jdbc.Driver");
          ds.setDriverProperties(dp);

...
dp.put("user","root");
dp.put("password","");
...
ds.setDriverProperties(dp);