fix(mediafilter): log unparsable-PDF filter-media errors as WARN, not ERROR

A corrupt/malformed source PDF made PDFBoxThumbnail and TikaTextExtractionFilter
let a parse IOException escape, which MediaFilterServiceImpl re-logged at ERROR --
flooding the nightly filter-media job (~4,655 ERROR lines/night) and tripping
alerting, even though the job already skips the file and continues.

Reimplemented for dtq-dev (PDFBox 3 / Loader.loadPDF; the TUL PDFBox-2 diff does
not apply as-is):
- PDFBoxThumbnail: catch the parse IOException, log WARN, return null (skip).
- TikaTextExtractionFilter: read the bitstream into memory first so a genuine
  assetstore read failure still propagates, then catch IOException/TikaException
  from the in-memory parse only -> WARN + return null. This narrows the catch so
  real I/O errors are not swallowed (the TUL Tika variant caught all IOException).

Port of dataquest-dev/dspace-customers#903 (item 4). Source: customer/TUL 7035a4c (reimplemented).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: jr-rk

dspace-api/src/main/java/org/dspace/app/mediafilter/PDFBoxThumbnail.java

@@ -8,6 +8,7 @@
 package org.dspace.app.mediafilter;
 
 import java.awt.image.BufferedImage;
+import java.io.IOException;
 import java.io.InputStream;
 
 import org.apache.logging.log4j.Logger;
@@ -79,6 +80,13 @@ public InputStream getDestinationStream(Item currentItem, InputStream source, bo
         } catch (InvalidPasswordException ex) {
             log.error("PDF is encrypted. Cannot create thumbnail (item: {})", currentItem::getHandle);
             return null;
+        } catch (IOException ex) {
+            // A malformed/non-standard PDF (bad %PDF- header, missing xref, truncated file, etc.) is a
+            // data-quality problem in the source bitstream, not a DSpace fault. Skip the thumbnail
+            // instead of failing the whole filter-media run. See dataquest-dev/dspace-customers#752.
+            log.warn("PDF could not be parsed by PDFBox. Cannot create thumbnail (item: {}): {}",
+                    currentItem::getHandle, ex::getMessage);
+            return null;
         }
 
         // Generate thumbnail derivative and return as IO stream.

dspace-api/src/main/java/org/dspace/app/mediafilter/TikaTextExtractionFilter.java

@@ -79,16 +79,22 @@ public InputStream getDestinationStream(Item currentItem, InputStream source, bo
         // Get maximum size of structure that Tika will try to buffer.
         int maxArray = configurationService.getIntProperty("textextractor.max-array", DEFAULT_MAX_ARRAY);
         IOUtils.setByteArrayMaxOverride(maxArray);
+        // Read the bitstream fully first so a genuine assetstore read failure surfaces here and is
+        // not mistaken for a parse error in the catch below.
+        byte[] sourceBytes = source.readAllBytes();
         try {
             // Use Tika to extract text from input. Tika will automatically detect the file type.
             Tika tika = new Tika();
             tika.setMaxStringLength(maxChars); // Tell Tika the maximum number of characters to extract
-            extractedText = tika.parseToString(source);
-        } catch (IOException e) {
-            System.err.format("Unable to extract text from bitstream in Item %s%n", currentItem.getID().toString());
-            e.printStackTrace(System.err);
-            log.error("Unable to extract text from bitstream in Item {}", currentItem.getID().toString(), e);
-            throw e;
+            extractedText = tika.parseToString(new ByteArrayInputStream(sourceBytes));
+        } catch (IOException | TikaException e) {
+            // The bytes are already in memory, so this can only be a malformed/non-standard source
+            // file (corrupt PDF header, missing xref, truncated content) -- a data-quality problem in
+            // the bitstream, not a DSpace fault. Skip extraction instead of failing the whole
+            // filter-media run. See dataquest-dev/dspace-customers#752.
+            log.warn("Unable to extract text from bitstream in Item {}: {}",
+                    currentItem.getHandle(), e.getMessage());
+            return null;
         } catch (OutOfMemoryError oe) {
             System.err.format("OutOfMemoryError occurred when extracting text from bitstream in Item %s. " +
                 "You may wish to enable 'textextractor.use-temp-file'.%n", currentItem.getID().toString());