406 error always happening with spring rest controller - spring

Question

I'd like to have your opinion on a error always throwed in my spring boot rest controller. I got the following first controller accepting reading requests :
#RequestMapping(value="/read/{file:.+}" , method = RequestMethod.GET)
public ResponseEntity myFunction(#PathVariable("file") String file) {
String[] parts = file.split("\\.");
String extension = parts[1];
List<SousBloc> resWord;
List<SousBloc> resPdf;
List<CvAvecBlocs> resExcel;
RestTemplate rt = new RestTemplate();
rt.getMessageConverters().add(new StringHttpMessageConverter());
if(extension.equals("xlsx")){
resExcel = rt.getForObject("http://localhost:8080/readExcel/"+file, List.class, 200);
return new ResponseEntity<>(resExcel, HttpStatus.OK);
}
else if(extension.equals("pdf")){
resPdf = rt.getForObject("http://localhost:8080/readPdf/"+file, List.class, 200);
return new ResponseEntity<>(resPdf, HttpStatus.OK);
}
else if(extension.equals("docx")){
resWord = rt.getForObject("http://localhost:8080/readWord/"+file, List.class, 200);
return new ResponseEntity<>(resWord, HttpStatus.OK);
}
return null;
}
There is my Reading Word Controller :
#Controller
public class ReadWordController {
private static String UPLOADED_FOLDER = "C:\\cvsUploades\\";
#Autowired
ReadWord readWord;
#RequestMapping(value="/readWord/{file:.+}" , method = RequestMethod.GET)
public ResponseEntity readingWord(#PathVariable("file") String file) throws IOException {
String path = UPLOADED_FOLDER+file;
List<SousBloc> sousBlocs = readWord.extract(path);
return new ResponseEntity<>(sousBlocs, HttpStatus.OK);
}
}
Well this controller works fine and does the job.
Now there is my Reading Pdf Controller :
#Controller
public class ReadPdfController {
private static String UPLOADED_FOLDER = "C:\\cvsUploades\\";
#Autowired
ReadPdf readPdf;
#RequestMapping(value="/readPdf/{file:.+}" , method = RequestMethod.GET)
public ResponseEntity readingPdf(#PathVariable("file") String file) throws IOException {
String path = UPLOADED_FOLDER+file;
List<SousBloc> blocs = readPdf.extract(path);
return new ResponseEntity<>(blocs, HttpStatus.OK);
}
}
It is contructed on the same model of the Reading Word Controller but it does not work. In debug, the program works fine until the return new ResponseEntity<>(blocs, HttpStatus.OK); that throws a 406 error null...
Do you know why ?
EDIT: I tried something strange and it worked... I put the following code :
#Controller
public class ReadWordController {
private static String UPLOADED_FOLDER = "C:\\cvsUploades\\";
#Autowired
ReadWord readWord;
#Autowired
ReadPdf readPdf;
#RequestMapping(value="/readWord/{file:.+}" , method = RequestMethod.GET)
public ResponseEntity readingWord(#PathVariable("file") String file) throws IOException {
/*String path = UPLOADED_FOLDER+file;
List<SousBloc> sousBlocs = readWord.extract(path);
return new ResponseEntity<>(sousBlocs, HttpStatus.OK);*/
String path = "C:\\cvsUploades\\file.pdf";
List<SousBloc> blocs = readPdf.extract(path);
return new ResponseEntity<>(blocs, HttpStatus.OK);
}
}