use libreoffice for pdfa

src/main/java/stirling/software/SPDF/config/EndpointConfiguration.java

@@ -265,9 +265,6 @@ public class EndpointConfiguration {
         // Pdftohtml dependent endpoints
         addEndpointToGroup("Pdftohtml", "pdf-to-html");
         addEndpointToGroup("Pdftohtml", "pdf-to-markdown");
-
-        // disabled for now while we resolve issues
-        disableEndpoint("pdf-to-pdfa");
     }
 
     private void processEnvironmentConfigs() {

src/main/java/stirling/software/SPDF/controller/api/converters/ConvertPDFToPDFA.java

@@ -73,8 +73,8 @@ public class ConvertPDFToPDFA {
             // Determine PDF/A filter based on requested format
             String pdfFilter =
                     "pdfa".equals(outputFormat)
-                            ? "writer_pdf_Export:{'SelectPdfVersion':{'Value':'2'}}:writer_pdf_Export"
-                            : "writer_pdf_Export:{'SelectPdfVersion':{'Value':'1'}}:writer_pdf_Export";
+                            ? "pdf:writer_pdf_Export:{\"SelectPdfVersion\":{\"type\":\"long\",\"value\":\"2\"}}"
+                            : "pdf:writer_pdf_Export:{\"SelectPdfVersion\":{\"type\":\"long\",\"value\":\"1\"}}";
 
             // Prepare LibreOffice command
             List<String> command =
@@ -84,7 +84,7 @@ public class ConvertPDFToPDFA {
                                     "--headless",
                                     "--nologo",
                                     "--convert-to",
-                                    "pdf:" + pdfFilter,
+                                    pdfFilter,
                                     "--outdir",
                                     tempOutputDir.toString(),
                                     tempInputFile.toString()));