PDFBOX-5660: close FDFDocument in case of Exception

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1932952 13f79535-47bb-0310-9956-ffa450edef68

Author: Maruan Sahyoun

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/PDAcroForm.java

@@ -152,24 +152,32 @@ public void importFDF(FDFDocument fdf) throws IOException
     public FDFDocument exportFDF() throws IOException
     {
         FDFDocument fdf = new FDFDocument();
-        FDFCatalog catalog = fdf.getCatalog();
-        FDFDictionary fdfDict = new FDFDictionary();
-        catalog.setFDF(fdfDict);
-
-        List<PDField> fields = getFields();
-        List<FDFField> fdfFields = new ArrayList<>(fields.size());
-        for (PDField field : fields)
+        try
         {
-            fdfFields.add(field.exportFDF());
-        }
+            FDFCatalog catalog = fdf.getCatalog();
+            FDFDictionary fdfDict = new FDFDictionary();
+            catalog.setFDF(fdfDict);
+
+            List<PDField> fields = getFields();
+            List<FDFField> fdfFields = new ArrayList<>(fields.size());
+            for (PDField field : fields)
+            {
+                fdfFields.add(field.exportFDF());
+            }
 
-        fdfDict.setID(document.getDocument().getDocumentID());
+            fdfDict.setID(document.getDocument().getDocumentID());
 
-        if (!fdfFields.isEmpty())
+            if (!fdfFields.isEmpty())
+            {
+                fdfDict.setFields(fdfFields);
+            }
+            return fdf;
+        }
+        catch (Exception e)
         {
-            fdfDict.setFields(fdfFields);
+            fdf.close();
+            throw e;
         }
-        return fdf;
     }
 
     /**