Missing converter backend for 'pdf'

Hi all,

I have created a web app in Vaadin that uses and Asciidoctor features for converting .adoc files to .pdf.
The app run on one laptop and I needed it to build on the other one, too.

In the addition, for few days I have been facing the error of missing converter back-end for 'pdf'.

I have already included asciidoctorj-pdf-1.5.0-alpha.9.jar and asciidoctorj-pdf-1.5.0-alpha.9.jar and all other necessary .jar files that I had added on the previous computer.

Bellow you can find the code and the exception:
fileName = DocumentName.getName();
               
                try{
                File file = new File(fileName + ".adoc");
                if (!file.exists()) {
                        file.createNewFile();
                }

               
                fw = new FileWriter(file.getAbsoluteFile());
                bw = new BufferedWriter(fw);
               
                try {
                        printSelectedElementsInDocument();
                }
                catch (IOException e)
                {
                        e.printStackTrace();
                }
               
                bw.close();
                Asciidoctor asciidoctor = Asciidoctor.Factory.create();

                HashMap<String, Object> options = new HashMap<String, Object>();
                options.put("backend", "pdf");
                options.put("in_place", true);

                asciidoctor.convertFile(file,options);

                Notification.show("Now, you can download the document.");
               
                try{
                        Resource resource = new FileResource(new File("/home/amra/Documents/eclipse/" +fileName+ ".pdf"));
                        FileDownloader fileDownloader = new FileDownloader(resource);
                        fileDownloader.extend(MasterBrochureTab.getDownloadBrochureButton());
                }
                catch(Exception e)
                {
                        Notification.show("You need to generate a brochure, and then download it.");
                }
               
                }
                catch (IOException e) {
                        e.printStackTrace();
                }
       
                Asciidoctor asciidoctor = Asciidoctor.Factory.create();

                HashMap<String, Object> options = new HashMap<String, Object>();
                options.put("backend", "pdf");
                options.put("in_place", true);

                asciidoctor.convertFile(file,options);

                Notification.show("Now, you can download the document.");
               
                try{
                        Resource resource = new FileResource(new File( path +fileName+ ".pdf"));
                        FileDownloader fileDownloader = new FileDownloader(resource);
                        fileDownloader.extend(MasterBrochureTab.getDownloadBrochureButton());
                }
                catch(Exception e)
                {
                        Notification.show("You need to generate a brochure, and then download it.");
                }
               
                }
                catch (IOException e) {
                        e.printStackTrace();
                }
       
       

The exception is thrown in asciidoctor.convertFile(file,options); line.

org.jruby.exceptions.RaiseException: (RuntimeError) asciidoctor: FAILED: missing converter for backend 'pdf'. Processing aborted.
        at RUBY.convert(/home/amra/Documents/Diplomski/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Proba/WEB-INF/lib/asciidoctorj-1.5.2.jar!/gems/asciidoctor-1.5.2/lib/asciidoctor/document.rb:1016)
        at RUBY.convert(/home/amra/Documents/Diplomski/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Proba/WEB-INF/lib/asciidoctorj-1.5.2.jar!/gems/asciidoctor-1.5.2/lib/asciidoctor.rb:1499)
        at RUBY.convert_file(/home/amra/Documents/Diplomski/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Proba/WEB-INF/lib/asciidoctorj-1.5.2.jar!/gems/asciidoctor-1.5.2/lib/asciidoctor.rb:1562)
        at RUBY.convertFile(<script>:68)
        at org.jruby.gen.InterfaceImpl2102387735.convertFile(org/jruby/gen/InterfaceImpl2102387735.gen:13)

PS I had the same exception few weeks ago, but then I have been using attributes to set up the back-end, and you advised me to use options which solved the error. This time I cannot find the root cause.

I appreciate your help.

Regards,

Amra

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