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java.net.ConnectException: Connection refused: connect	at java.net.PlainSocketImpl.socketConnect(Native Method)	at java.net.PlainSocketImpl.doConnect(Unknown Source)	at java.net.PlainSocketImpl.connectToAddress(Unknown Source)	at java.net.PlainSocketImpl.connect(Unknown Source)	at java.net.SocksSocketImpl.connect(Unknown Source)	at java.net.Socket.connect(Unknown Source)	at java.net.Socket.connect(Unknown Source)	at java.net.Socket.(Unknown Source)	at java.net.Socket.(Unknown Source)	at org.hsqldb.server.HsqlSocketFactory.createSocket(Unknown Source)	at org.hsqldb.ClientConnection.openConnection(Unknown Source)	at org.hsqldb.ClientConnection.initConnection(Unknown Source)	at org.hsqldb.ClientConnection.(Unknown Source)	at org.hsqldb.jdbc.JDBCConnection.(Unknown Source)	at org.hsqldb.jdbc.JDBCDriver.getConnection(Unknown Source)	at org.hsqldb.jdbc.JDBCDriver.connect(Unknown Source)	at java.sql.DriverManager.getConnection(Unknown Source)	at java.sql.DriverManager.getConnection(Unknown Source)	at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:133)	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)	at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)	at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142)	at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85)	at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1354)	at com.vaannila.student.Main.main(Main.java:15)