src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFTable.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.xssf.usermodel;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.util.TempFile;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.junit.Test;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTable;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn;

public final class TestXSSFTable {

    public TestXSSFTable() {
    }

    @Test
    @SuppressWarnings("deprecation")
    public void bug56274() throws IOException {
        // read sample file
        XSSFWorkbook inputWorkbook = XSSFTestDataSamples.openSampleWorkbook("56274.xlsx");

        // read the original sheet header order
        XSSFRow row = inputWorkbook.getSheetAt(0).getRow(0);
        List<String> headers = new ArrayList<String>();
        for (Cell cell : row) {
            headers.add(cell.getStringCellValue());
        }

        // save the worksheet as-is using SXSSF
        File outputFile = TempFile.createTempFile("poi-56274", ".xlsx");
        SXSSFWorkbook outputWorkbook = new org.apache.poi.xssf.streaming.SXSSFWorkbook(inputWorkbook);
        outputWorkbook.write(new FileOutputStream(outputFile));

        // re-read the saved file and make sure headers in the xml are in the original order
        inputWorkbook = new org.apache.poi.xssf.usermodel.XSSFWorkbook(new FileInputStream(outputFile));
        CTTable ctTable = inputWorkbook.getSheetAt(0).getTables().get(0).getCTTable();
        CTTableColumn[] ctTableColumnArray = ctTable.getTableColumns().getTableColumnArray();

        assertEquals("number of headers in xml table should match number of header cells in worksheet",
                headers.size(), ctTableColumnArray.length);
        for (int i = 0; i < headers.size(); i++) {
            assertEquals("header name in xml table should match number of header cells in worksheet",
                    headers.get(i), ctTableColumnArray[i].getName());
        }
        assertTrue(outputFile.delete());
    }

}