I tried simple program to test org.apache.tomcat.jdbc.pool.interceptor.StatementCache of tomcat jdbc pool as given in doc:(https://tomcat.apache.org/tomcat-9.0-doc/jdbc-pool.html#org.apache.tomcat.jdbc.pool.interceptor.StatementCache)

Code:

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import org.apache.tomcat.jdbc.pool.DataSource;
import org.apache.tomcat.jdbc.pool.PoolConfiguration;
import org.apache.tomcat.jdbc.pool.PoolProperties;

public class TestPreparedstmtCache {

    public static void main(String[] args) {
        PoolProperties poolProperties = new PoolProperties();
        poolProperties.setUrl("jdbc:postgresql://localhost:5432/mydb");
        poolProperties.setUsername("myuser");
        poolProperties.setPassword("mypass");
        poolProperties.setDriverClassName("org.postgresql.Driver");
        poolProperties.setJdbcInterceptors("StatementCache(max=500)");

        DataSource dataSource = new DataSource();
        dataSource.setPoolProperties(poolProperties);
        try (Connection connection = dataSource.getConnection()) {

            PoolConfiguration poolConfig = dataSource.getPoolProperties();

            // Check if prepared statements are being cached
            // Create and execute prepared statement 1
            PreparedStatement pstmt1 = connection.prepareStatement("select count(*) from mytable");
            ResultSet rs=pstmt1.executeQuery();  
            while(rs.next()){  
            System.out.println(rs.getInt(1));  
            }  
            int hashcode1 = pstmt1.hashCode();
            System.out.println("Hashcode of pstmt1: " + hashcode1);

            // Create and execute prepared statement 2 with the same query
            PreparedStatement pstmt2 = connection.prepareStatement("select count(*) from mytable");
            ResultSet r2=pstmt2.executeQuery();  
            while(r2.next()){  
            System.out.println(r2.getInt(1));  
            }  
            int hashcode2 = pstmt2.hashCode();
            System.out.println("Hashcode of pstmt2: " + hashcode2);

            if (hashcode1 == hashcode2) {
                System.out.println("Statement caching worked. Same hashcode for pstmt1 and pstmt2.");
            } else {
                System.out.println("Statement caching did not work. Different hashcodes for pstmt1 and pstmt2.");
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }

}

when I tried this one it always returns the hash code is different and i checked connection object while debugging it has preparedstatementcache property with value.
so am I missing anything here, how can i verify preparedStatment is cached correctly.