logging for #1024 and jdk bump

Dockerfile

@@ -34,7 +34,7 @@ RUN echo "@testing https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /et
 openssl-dev \
         bash \
         curl \
-        openjdk17-jre \
+        openjdk21-jre \
         su-exec \
         shadow \
 # Doc conversion

Dockerfile-ultra-lite

@@ -31,7 +31,7 @@ RUN mkdir /configs /logs /customFiles && \
         curl \
         su-exec \
         shadow \
-        openjdk17-jre && \
+        openjdk21-jre && \
     echo "@testing https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/apk/repositories && \
     echo "@testing https://dl-cdn.alpinelinux.org/alpine/edge/community" | tee -a /etc/apk/repositories && \
     echo "@testing https://dl-cdn.alpinelinux.org/alpine/edge/testing" | tee -a /etc/apk/repositories && \

LocalRunGuide.md

@@ -14,7 +14,7 @@ You could theoretically use a Distrobox/Toolbox, if your Distribution has old or
 
 Install the following software, if not already installed:
 
-- Java 17 or later
+- Java 17 or later (21 recommended)
 
 - Gradle 7.0 or later (included within repo so not needed on server)
 
@@ -42,19 +42,19 @@ For Debian-based systems, you can use the following command:
 
 ```bash
 sudo apt-get update
-sudo apt-get install -y git  automake  autoconf  libtool  libleptonica-dev  pkg-config zlib1g-dev make g++ openjdk-17-jdk python3 python3-pip
+sudo apt-get install -y git  automake  autoconf  libtool  libleptonica-dev  pkg-config zlib1g-dev make g++ openjdk-21-jdk python3 python3-pip
 ```
 
 For Fedora-based systems use this command:
 
 ```bash
-sudo dnf install -y git automake autoconf libtool leptonica-devel pkg-config zlib-devel make gcc-c++ java-17-openjdk python3 python3-pip
+sudo dnf install -y git automake autoconf libtool leptonica-devel pkg-config zlib-devel make gcc-c++ java-21-openjdk python3 python3-pip
 ```
 
 For non-root users with Nix Package Manager, use the following command:
 ```bash
 nix-channel --update
-nix-env -iA nixpkgs.jdk17 nixpkgs.git nixpkgs.python38 nixpkgs.gnumake nixpkgs.libgcc nixpkgs.automake nixpkgs.autoconf nixpkgs.libtool nixpkgs.pkg-config nixpkgs.zlib nixpkgs.leptonica
+nix-env -iA nixpkgs.jdk21 nixpkgs.git nixpkgs.python38 nixpkgs.gnumake nixpkgs.libgcc nixpkgs.automake nixpkgs.autoconf nixpkgs.libtool nixpkgs.pkg-config nixpkgs.zlib nixpkgs.leptonica
 ```
 
 ### Step 2: Clone and Build jbig2enc (Only required for certain OCR functionality)

src/main/java/stirling/software/SPDF/config/security/UserBasedRateLimitingFilter.java

@@ -1,6 +1,5 @@
 package stirling.software.SPDF.config.security;
 
-import io.github.pixee.security.Newlines;
 import java.io.IOException;
 import java.time.Duration;
 import java.util.Map;
@@ -21,6 +20,7 @@ import io.github.bucket4j.Bandwidth;
 import io.github.bucket4j.Bucket;
 import io.github.bucket4j.ConsumptionProbe;
 import io.github.bucket4j.Refill;
+import io.github.pixee.security.Newlines;
 
 import jakarta.servlet.FilterChain;
 import jakarta.servlet.ServletException;
@@ -126,12 +126,16 @@ public class UserBasedRateLimitingFilter extends OncePerRequestFilter {
         ConsumptionProbe probe = userBucket.tryConsumeAndReturnRemaining(1);
 
         if (probe.isConsumed()) {
-            response.setHeader("X-Rate-Limit-Remaining", Newlines.stripAll(Long.toString(probe.getRemainingTokens())));
+            response.setHeader(
+                    "X-Rate-Limit-Remaining",
+                    Newlines.stripAll(Long.toString(probe.getRemainingTokens())));
             filterChain.doFilter(request, response);
         } else {
             long waitForRefill = probe.getNanosToWaitForRefill() / 1_000_000_000;
             response.setStatus(HttpStatus.TOO_MANY_REQUESTS.value());
-            response.setHeader("X-Rate-Limit-Retry-After-Seconds", Newlines.stripAll(String.valueOf(waitForRefill)));
+            response.setHeader(
+                    "X-Rate-Limit-Retry-After-Seconds",
+                    Newlines.stripAll(String.valueOf(waitForRefill)));
             response.getWriter().write("Rate limit exceeded for POST requests.");
         }
     }

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

@@ -36,7 +36,7 @@ public class ConvertImgPDFController {
             description =
                     "This endpoint converts a PDF file to image(s) with the specified image format, color type, and DPI. Users can choose to get a single image or multiple images.  Input:PDF Output:Image Type:SI-Conditional")
     public ResponseEntity<byte[]> convertToImage(@ModelAttribute ConvertToImageRequest request)
-            throws IOException {
+            throws NumberFormatException, Exception {
         MultipartFile file = request.getFileInput();
         String imageFormat = request.getImageFormat();
         String singleOrMultiple = request.getSingleOrMultiple();
@@ -56,7 +56,7 @@ public class ConvertImgPDFController {
         String filename =
                 Filenames.toSimpleFileName(file.getOriginalFilename())
                         .replaceFirst("[.][^.]+$", "");
-        try {
+        
         result =
                 PdfUtils.convertFromPdf(
                         pdfBytes,
@@ -65,14 +65,11 @@ public class ConvertImgPDFController {
                         singleImage,
                         Integer.valueOf(dpi),
                         filename);
-        } catch (IOException e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
-        } catch (Exception e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
-        }
         
+
+        if(result == null || result.length == 0) {
+        	logger.error("resultant bytes for {} is null, error converting ", filename);
+        }
         if (singleImage) {
             String docName = filename + "." + imageFormat;
             MediaType mediaType = MediaType.parseMediaType(getMediaType(imageFormat));