I found a issue on XlsExport.java. Line 69 (HSSFSheet sheet = workbook.createSheet(exportConf.getFileName()); ) if the filename exceed 31 characters, i throws an Exception because, the sheet name max length is 31
i think i can specify the „null“ problem. if the nested property is null the output is an empty string and a null value is outputted as „null“ with nested property i mean: contact.contactData.country.name if contactData or country is null, the log message from above is shown and the output is an empty string. if name is null, then the output is „null“ as string. And this is the same also if i declare a defaultContent of „“. the output is also „null"