exception when inputstream is read from getClass().getClassLoader().getResourceAsStream("file.xls")

[individuodk]

hi!!
poi-3.5-FINAL.jar


                        if (sourcePath == null){
                                inputStream =
getClass().getClassLoader().getResourceAsStream("file.xls");
                                workbook = WorkbookFactory.create(inputStream);
                        }
                        else{
                                inputStream = new FileInputStream(sourcePath);
                                workbook = WorkbookFactory.create(inputStream);
                        }

When i read excel file from FileInputStream to modify it, all works fine.
When i read excel file (SAME excel file) from
getClass().getClassLoader().getResourceAsStream..., all are exceptions like
next:

convertPOIOutputStream|null|Exception||4|5|N| [ java.io.IOException ] block[
63 ] already removed -
does your POIFS have circular or duplicate block
references?java.io.IOException: block[ 63 ] already
 removed - does your POIFS have circular or duplicate block references?
        at
org.apache.poi.poifs.storage.BlockListImpl.remove(BlockListImpl.java:89)
        at
org.apache.poi.poifs.storage.RawDataBlockList.remove(RawDataBlockList.java:32)
        at
org.apache.poi.poifs.storage.BlockAllocationTableReader.fetchBlocks(BlockAllocationTableR
eader.java:187)
        at
org.apache.poi.poifs.storage.BlockListImpl.fetchBlocks(BlockListImpl.java:123)
        at
org.apache.poi.poifs.storage.RawDataBlockList.fetchBlocks(RawDataBlockList.java:32)
        at
org.apache.poi.poifs.filesystem.POIFSFileSystem.processProperties(POIFSFileSystem.java:54
1)
        at
org.apache.poi.poifs.filesystem.POIFSFileSystem.<init>(POIFSFileSystem.java:176)


or

convertPOIOutputStream|null|Exception||4|5|N| [
org.apache.poi.hssf.record.RecordFormatException ] U
nable to construct record
instanceorg.apache.poi.hssf.record.RecordFormatException: Unable to constr
uct record instance
        at
org.apache.poi.hssf.record.RecordFactory$ReflectionRecordCreator.create(RecordFactory.jav
a:64)
        at
org.apache.poi.hssf.record.RecordFactory.createSingleRecord(RecordFactory.java:263)
        at
org.apache.poi.hssf.record.RecordFactoryInputStream.readNextRecord(RecordFactoryInputStre
am.java:270)
        at
org.apache.poi.hssf.record.RecordFactoryInputStream.nextRecord(RecordFactoryInputStream.j
ava:236)
        at
org.apache.poi.hssf.record.RecordFactory.createRecords(RecordFactory.java:377)
        at
org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:275)
        at
org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:200)
        at
org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:316)
        at
org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:297)
        at
org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:60)


any idea about how to input file to resource? why does it happen ???
thanks!
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