All open JDBC connections must be closed in the finally() block.
import java.sql.*;
import javax.sql.*;
public class
ClassA
{
public void
method () {
Connection con = null;
Connection con2 = null;
try {
con = DriverManager.getConnection("database url");
con2 = DataSource.getConnection("database url");
}
finally {
con.close();
con2.close();
}
}
}
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