Fix XML parsing error

src/main/java/org/folio/print/server/service/PdfService.java

@@ -30,8 +30,7 @@ public static byte[] createPdfFile(String htmlContent) {
     if (htmlContent != null && !htmlContent.isBlank()) {
       try (PDDocument document = new PDDocument();
            ByteArrayOutputStream os = new ByteArrayOutputStream()) {
-        htmlContent = "<div>" + htmlContent + "</div>";
-        htmlContent = htmlContent.replace("<br>", "<br/>");
+        htmlContent = cleanHtmlData(htmlContent);
         PDPage page = new PDPage(PDRectangle.A4);
         document.addPage(page);
         ITextRenderer renderer = new ITextRenderer();
@@ -46,6 +45,24 @@ public static byte[] createPdfFile(String htmlContent) {
     return new byte[0];
   }
 
+  private static String cleanHtmlData(String htmlContent) {
+    return "<div>" + htmlContent
+        .replace("<br>", "<br/>")
+        .replace("&nbsp;", "&#160;")
+        .replace("&lt;", "&#60;")
+        .replace("&gt;", "&#62;")
+        .replace("&amp;", "&#38;")
+        .replace("&quot;", "&#34;")
+        .replace("&apos;", "&#39;")
+        .replace("&ndash;", "&#8211;")
+        .replace("&mdash;", "&#8212;")
+        .replace("&copy;", "&#169;")
+        .replace("&reg;", "&#174;")
+        .replace("&nbsp;", "&#160;")
+        .replace("&trade;", "&#8482;")
+        + "</div>";
+  }
+
   /**
    * Combine single print entries in batch print file.
    * @param entries Entries to combine

src/test/java/org/folio/print/server/service/PdfServiceTest.java

@@ -14,7 +14,8 @@ public class PdfServiceTest {
 
   @Test
   public void createPdfFile(){
-    byte[] result = PdfService.createPdfFile("<div><p>PDF file</p></div><br><p>Content</p>");
+    byte[] result = PdfService.createPdfFile("<div><p>PDF file</p></div><br><p>Content &nbsp; &lt; &gt; "
+        + "&amp; &quot; &apos; &ndash; &mdash; &copy; &reg; &nbsp; &trade;</p>");
     assertTrue(result.length > 0);
   }