Some file extension is not supported by viewer plesse find below list of extension
- Programming and Script Files:
- Java files (.java)
 - JavaScript files (.js)
 - C# files (.cs)
 - C++ files (.cpp)
 - CSS files (.css)
 
 - 3D Modeling and CAD Files:
- Industry Foundation Classes files (.ifc)
 - STL files (.stl)
 - OBJ files (.obj)
 
 - Microsoft Office and Adobe Files:
- Visio files (.vsd)
 - Macro-Enabled Excel Template files (.xltm)
 - Photoshop files (.psd)
 - Illustrator files (.ai)
 
 - Graphic and Image Files:
- TIFF files (.tiff)
 - EPS files (.eps)
 - EMF files (.emf)
 
 - Others:
- EPUB files (.epub)
 - TAR archive files (.tar)
 - JSON files (.json)
 
 
Please find below code for viewer
public AppResonse<GroupDocsRenderResponse> processView(GroupDocsRenderRequest renderRequest) throws JsonProcessingException {
        String successMessage = null;
        String errorMessage = null;
        String detailedErrorMessage = null;
        ErrorResponse errorResponse=null;
        GroupDocsRenderResponse successResponse = null;
        AppResonse<GroupDocsRenderResponse> appResonse;
        Viewer viewer = null;
        try {
            if (ObjectUtils.allNotNull(renderRequest, renderRequest.getProcess(), renderRequest.getSourceFile(), renderRequest.getExtension(), renderRequest.getDestinationFile())) {
                if (renderRequest.getProcess().trim().equalsIgnoreCase("viewer")) {
                    String providedFileExtension = renderRequest.getExtension();
                    LoadOptions loadOptions = new LoadOptions();
                    loadOptions.setFileType(FileType.fromExtension(providedFileExtension.trim().toUpperCase()));
                    viewer = new Viewer(Files.newInputStream(Paths.get(renderRequest.getSourceFile())), loadOptions);
                    PdfViewOptions viewOptions = new PdfViewOptions(renderRequest.getDestinationFile());
                    viewer.view(viewOptions);
                    successMessage = AppConstant.SUCCESS_MESSAGE;
                } else {
                    errorMessage = AppConstant.OPERATION_NOT_SUPPORTED;
                }
            } else {
                errorMessage = AppConstant.INVALID_INPUT;
            }
        } catch (Exception e) {
            e.printStackTrace();//TODO remove in production
            if(e instanceof NoSuchFileException){
                NoSuchFileException noSuchFileException =(NoSuchFileException)e;
                errorMessage= e.getMessage() +" invalid file location";
                detailedErrorMessage="File not found at source location";
            }else{
                errorMessage = e.getMessage();
                detailedErrorMessage = e.toString();
            }
        } finally {
            String debugId =appUtil.randomUUIDGenerator();
            if (null != viewer)
                viewer.close();
            if(ObjectUtils.anyNotNull(errorMessage,detailedErrorMessage))
                errorResponse = ErrorResponse.builder().message(errorMessage).issue(detailedErrorMessage).debugId(debugId).build();
            if(ObjectUtils.isNotEmpty(successMessage))
                successResponse = GroupDocsRenderResponse.builder().message(successMessage).build();
            appResonse = AppResonse.<GroupDocsRenderResponse>builder().data(successResponse).errors(errorResponse).build();
            log.info("request payload for debugId "+debugId+ " {}  " + objectMapper.writeValueAsString(renderRequest));
            log.info("response payload for debugId "+debugId+ " {}  " + objectMapper.writeValueAsString(appResonse));
        }
        return appResonse;
    }
and below code license setup
@Configuration
public class GroupDocsConfig {
    
    @Value("classpath:GroupDocs.Total.Product.Family.lic")
    Resource resourceFile;
   @Bean
   @Scope("prototype")
   public License setLicense() throws IOException {
        License license = new License();
        try (InputStream fileStream = resourceFile.getInputStream()) {
            license.setLicense(fileStream);
        }
        return license;
    }
}
 versions of api 
type or paste code here
parser - 23.9
viewer - 23.7
jdk 17
find below exception
Screenshot 2023-12-08 at 2.06.34 PM.jpg (144.2 KB)
hope above information is enough for troubleshoot so please find out why license is not working for parser and extension is not supported for viewer
Thanks  & Regards
Parashar
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