SQL Query works in SQLDeveloper but won't run in JDBC

Question

My query is "SELECT mbr,ime,prz FROM radnik WHERE mbr IN (SELECT DISTINCT sef FROM radnik)", and it does the job in SQLDeveloper. However when I run it in Eclipse i get the error "SQL command not properly ended". The issue persists even after removing the semicolon from the query. Here's the code:

public class Upit2_Sefovi {

    public static void main(String[] args) {
        
        try (Connection connection = ConnectionUtil_Basic.getConnection();
                PreparedStatement preparedStatement = connection.prepareStatement(generateQuery());
                ResultSet resultSet = preparedStatement.executeQuery()) {
            
            while (resultSet.next()) {
                int mbr = resultSet.getInt(1);
                String ime = resultSet.getString(2);
                String prezime = resultSet.getString(3);
                int brRadnika=ExecuteFun.getRadnici(mbr);

                System.out.printf("%-4d %-8s %-8s %-4d\n", mbr, ime, prezime,brRadnika);
            }
                
            
            
        }catch(SQLException e) {
            e.printStackTrace();
        }
    }
    
    private static String generateQuery() {
        String query = "select mbr,ime,prz"
                + " from radnik"
                + "where mbr in (select distinct sef from radnik)";
        return query;
    }
    
    

}

Here's the stacktrace:

java.sql.SQLSyntaxErrorException: ORA-00933: SQL command not properly ended

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:447)
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
    at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:951)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:513)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:208)
    at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:886)
    at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1175)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1296)
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
    at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3657)
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1495)
    at upit2.Upit2_Sefovi.main(Upit2_Sefovi.java:16)

Answer 1

You need a space between radnik and where.

        String query = "select mbr,ime,prz"
                + " from radnik"
                + " where mbr in (select distinct sef from radnik)";