Created attachment 27690 [details]
Sample xlsx file to demonstrate the bug

I am trying to get the themes table for XLSX files using the XSSFReader event model API (3.8-beta4). Unfortunately the getStylesTable() call of the XSSFReader class always returns a StylesTable with a null theme. Please see the following code and the attached xlsx file that demonstrate this problem. 

On the other hand, using the user model XSSFWorkbook API I am able to get the themes table and the RGB values correctly. So I suspect this is a bug of the getStylesTable() method.


package org.apache.poi.ss.examples;

import java.io.FileInputStream;

import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.StylesTable;
import org.apache.poi.xssf.model.ThemesTable;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.openxml4j.opc.OPCPackage;

public class TestTheme {
	
    public void processEventModel(String filename) throws Exception {
    	OPCPackage pkg = OPCPackage.open(filename);
    	XSSFReader r = new XSSFReader( pkg );
    	StylesTable st = r.getStylesTable();
    	ThemesTable ttable = st.getTheme();
    	System.out.println(ttable);
	
    	XSSFCellStyle cs = st.getStyleAt(1);
    	System.out.println(cs.getFillForegroundColorColor().getARGBHex());
    }

    public void processUserModel(String filename) throws Exception {
       	OPCPackage pkg = OPCPackage.open(filename);
        XSSFWorkbook wb = new XSSFWorkbook(pkg);
        StylesTable st = wb.getStylesSource(); 
    	ThemesTable ttable = st.getTheme();

    	System.out.println(ttable);
    	XSSFCellStyle cs = st.getStyleAt(1);
    	System.out.println(cs.getFillForegroundColorColor().getARGBHex());
    }
    
    public static void main(String[] args) throws Exception {
    	TestTheme tt = new TestTheme();
    	System.out.println("Getting ThemesTable using Event Model");
    	tt.processEventModel(args[0]);
    	System.out.println("Getting ThemesTable using User Model");
    	tt.processUserModel(args[0]);
    }
}