java.sql.SQLException: Cannot instantiate a SerialArray object with null parameters
	at java.sql.rowset/javax.sql.rowset.serial.SerialArray.<init>(SerialArray.java:152)

Map<String, Class<?>> map = (crs.getTypeMap() == null)?con.getTypeMap():crs.getTypeMap();

public Map<String, Class<?>> getTypeMap() throws SQLException {
    ...
    return null;

Unless the application has added an entry, the type map returned will be empty. 

rs.setTypeMap(Collections.emptyMap());

package play.syncerror;

import java.io.StringReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Collections;

import javax.sql.RowSet;
import javax.sql.rowset.CachedRowSet;
import javax.sql.rowset.RowSetProvider;

import org.h2.tools.RunScript;

/** */
public class ConnectionTypeMap
{
    void doit() throws ClassNotFoundException, SQLException
    {
        //String url = "jdbc:h2:mem:suppliers_and_parts;TRACE_LEVEL_SYSTEM_OUT=3";
        String url = "jdbc:h2:mem:suppliers_and_parts";

        boolean use_crs = true;
        boolean use_workaround = false;

        Class.forName("org.h2.Driver");
        Connection conn = DriverManager.getConnection(url);
        RunScript.execute(conn, new StringReader(createDB));

        System.err.printf("########### use_crs: %s, use_workaround: %s\n",
                          use_crs, use_workaround);

        RowSet rs;
        if (use_crs) {
            rs = RowSetProvider.newFactory().createCachedRowSet();
        } else {
            rs = RowSetProvider.newFactory().createJdbcRowSet();
        }

        if (use_workaround)
            rs.setTypeMap(Collections.emptyMap());

        rs.setUrl(url);
        rs.setCommand("SELECT * FROM swingset_base_test_data");
        rs.execute();
        rs.first();
        Object o = rs.getObject(2);
        System.err.printf("########### %s\n", o);
        rs.updateString(2, "xxx");
        rs.updateRow();

        if (use_crs)
            ((CachedRowSet)rs).acceptChanges();

        rs.execute();
        rs.first();
        o = rs.getObject(2);
        System.err.printf("########### %s\n", o);
    }

    String createDB =
      "CREATE SEQUENCE IF NOT EXISTS swingset_base_test_seq START WITH 1000;\n"
    + "CREATE TABLE IF NOT EXISTS swingset_base_test_data \n"
    + "( \n"
    + "    swingset_base_test_pk INTEGER DEFAULT nextval('swingset_base_test_seq') NOT NULL PRIMARY KEY,\n"
    + "    ss_text_field VARCHAR(100),\n"
    + "    ss_list INTEGER ARRAY\n"
    + ");\n"
    + "MERGE INTO swingset_base_test_data VALUES (1,'This is TextField 1',ARRAY[1,2,3]) ;\n"
    + "MERGE INTO swingset_base_test_data VALUES (2,'This is TextField 2',ARRAY[3,4,5]) ;\n";
    

    public static void main(String[] args)
            throws ClassNotFoundException, SQLException
    {
        new ConnectionTypeMap().doit();
    }

}