throw different message exception with message body - ajax

Question

I am trying unzipping a zip file which might be empty no files and folder. It was throwing an UnsupportedOperationException therefore I was handling with throw keyword and then giving the message body to jsp page.
try {
boolean upload=unzipUploadedFile(saveZip,folderName);
if(upload)
return ServiceResponse.createSuccessResponse();
else
return ServiceResponse.createFailureResponse("Files cannot be unzipped");
}catch(Exception e) {
e.printStackTrace();
return ServiceResponse.createFailureResponse(e.getMessage());
}
private boolean unzipUploadedFile(File saveZip, String folderName) throws Exception {
//Open the file
try(ZipFile file = new ZipFile(saveZip.getCanonicalPath()))
{
FileSystem fileSystem = FileSystems.getDefault();
//Get file entries
Path inputpath=fileSystem.getPath(file.getName());
Enumeration<? extends ZipEntry> entries = file.entries();
//We will unzip files in this folder
File directory=new File(zipFilePath.concat(folderName));
if(!directory.exists()) {
directory.mkdir();
}
//Iterate over entries
while (entries.hasMoreElements())
{
ZipEntry entry = entries.nextElement();
String abc[]=entry.getName().split("/");
//Else create the file
if(!entry.isDirectory())
{
InputStream is = file.getInputStream(entry);
BufferedInputStream bis = new BufferedInputStream(is);
String uncompressedFileName = zipFilePath +folderName+"/"+ abc[abc.length-1];
Path uncompressedFilePath = fileSystem.getPath(uncompressedFileName);
if(Files.notExists(uncompressedFilePath))
Files.createFile(uncompressedFilePath);
FileOutputStream fileOutput = new FileOutputStream(uncompressedFileName);
while (bis.available() > 0)
{
fileOutput.write(bis.read());
}
fileOutput.close();
System.out.println("Written :" + entry.getName());
is.close();
bis.close();
}
}
file.close();
Files.deleteIfExists(inputpath);
fileSystem.close();
}catch(UnsupportedOperationException e)
{
throw new UnsupportedOperationException("Uploaded zip does not contain proper file or folder");
}
catch(Exception e) {
throw new Exception("File unizipping unsuccessful");
}
return true;
}
But if I add the zip with all files in it still it is giving me Uploaded zip does not contain proper file or folder at the UI end
Jsp page where I called the controller code
$
.ajax({
type : 'POST',
url : baseUrl + url,
data : data,
cache: false,
dataType: 'json',
processData: false,
contentType: false,
success: function(dataset){
console.log(dataset.error);
document.getElementById("spinner").style.display = "none";
$('#reportError').modal('show');
document.getElementById('uploadError').innerHTML="<center>"+dataset.error+"</center>";
document.getElementById('error_title').innerHTML="Upload Failure";
},
error : function(e){
console.log(e);
}
});
Stack trace
java.lang.UnsupportedOperationException: Uploaded zip does not contain proper file or folder
at com.tata.green.controller.GreenBackendServiceController.unzipUploadedF
ile(GreenBackendServiceController.java:580)
at com.tata.green.controller.GreenBackendServiceController.uploadServerDe
tails(GreenBackendServiceController.java:509)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvok
e(InvocableHandlerMethod.java:205)