SQL异常列无效,java SQL语句

在ORACLE数据库上使用JAVA执行以下SQL语句时,我遇到了一个问题,它与DBeaver/SQLdeveloper一起工作,但在JAVA过程中,我遇到了以下错误。有什么想法吗?

SQL语句:

SELECT MIN(SUBSTR(t1.MONTH,1,4)) || 'A' || 'B' || 'CDE FGR' || ' ' || 'AT'
FROM table1 t1, table2 t2
WHERE t1.toto=t2.toto
AND t1.tata=t2.tata
AND t1.titi=t2.titi
AND t2.tutu = 'IMPACT_EUROPE_FLAG'

java进程期间发生SQL错误:

org.springframework.jdbc.BadSqlGrammarException: Attempt to process next row failed; bad SQL grammar

nested exception is java.sql.SQLException: Invalid column name

表格:

TABLE1  TABLE2 
--------------
MONTH   TOTO
TOTO    TATA
TATA    TITI
TITI    TUTU
TUTU

我的java进程,只有reader和stepbuilder:

 private Step insertBaseToFile() {
        return stepBuilderFactory.get("insertBaseToFile").<GenericRecord, GenericRecord>chunk(100).reader(baseReader())
                .writer(fileWriter()).build();
 }

private JdbcCursorItemReader<GenericRecord> baseReader() {

        JdbcCursorItemReader<GenericRecord> databaseReader = new JdbcCursorItemReader<>();

        String sql = null;

        sql = " SELECT MIN(SUBSTR(t1.MONTH,1,4)) || 'A' || 'B' || 'CDE FGR' || ' ' || 'AT' " +
                    "FROM table1 t1, table2 t2 " +
                    "WHERE t1.toto=t2.toto " +
                    "AND t1.tata=t2.tata " +
                    "AND t1.titi=t2.titi " +
                    "AND t2.tutu = 'IMPACT_EUROPE_FLAG'" 

        databaseReader.setDataSource(dataSource); //dataSource object from my class using JSON conf to get logs in to DB
        databaseReader.setSql(sql);

        return databaseReader;
}