diff -Nru netty-4.1.45/debian/changelog netty-4.1.45/debian/changelog
--- netty-4.1.45/debian/changelog	2024-02-28 14:55:31.000000000 +0000
+++ netty-4.1.45/debian/changelog	2024-02-28 14:55:31.000000000 +0000
@@ -1,9 +1,12 @@
-netty (1:4.1.45-1ubuntu0.1) focal-security; urgency=medium
+netty (1:4.1.45-1ubuntu0.2) focal-security; urgency=medium
 
   * SECURITY UPDATE: Uncontrolled Resource Consumption
     - debian/patches/CVE-2023-44487.patch: HTTP/2 Rapid Reset Attack - DDoS
       vector in the HTTP/2 protocol due RST frames.
     - CVE-2023-44487
+  * Other fixes:
+    - debian/patches/21-java-17.patch: Function was removed in JDK15 and
+      later.
 
  -- Paulo Flabiano Smorigo <pfsmorigo@canonical.com>  Wed, 28 Feb 2024 11:55:31 -0300
 
diff -Nru netty-4.1.45/debian/patches/21-java-17.patch netty-4.1.45/debian/patches/21-java-17.patch
--- netty-4.1.45/debian/patches/21-java-17.patch	1970-01-01 00:00:00.000000000 +0000
+++ netty-4.1.45/debian/patches/21-java-17.patch	2024-02-28 14:55:31.000000000 +0000
@@ -0,0 +1,17 @@
+Description: compile with JDK 17
+Source: https://github.com/netty/netty/commit/bb184794341255cf02f9b7156c5ad828b172fdab.patch
+Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1011135
+Comment: No longer needed after updating upstream to 4.1.52 or later
+
+--- netty-4.1.45.orig/handler/src/main/java/io/netty/handler/ssl/util/OpenJdkSelfSignedCertGenerator.java
++++ netty-4.1.45/handler/src/main/java/io/netty/handler/ssl/util/OpenJdkSelfSignedCertGenerator.java
+@@ -66,7 +66,8 @@ final class OpenJdkSelfSignedCertGenerat
+         info.set(X509CertInfo.VALIDITY, new CertificateValidity(notBefore, notAfter));
+         info.set(X509CertInfo.KEY, new CertificateX509Key(keypair.getPublic()));
+         info.set(X509CertInfo.ALGORITHM_ID,
+-                new CertificateAlgorithmId(new AlgorithmId(AlgorithmId.sha256WithRSAEncryption_oid)));
++                // sha256WithRSAEncryption
++                new CertificateAlgorithmId(AlgorithmId.get("1.2.840.113549.1.1.11")));
+ 
+         // Sign the cert to identify the algorithm that's used.
+         X509CertImpl cert = new X509CertImpl(info);
diff -Nru netty-4.1.45/debian/patches/series netty-4.1.45/debian/patches/series
--- netty-4.1.45/debian/patches/series	2024-02-28 14:55:31.000000000 +0000
+++ netty-4.1.45/debian/patches/series	2024-02-28 14:55:31.000000000 +0000
@@ -13,3 +13,4 @@
 16-disable-substratevm-support.patch
 17-disable-blockhound-integration.patch
 CVE-2023-44487.patch
+21-java-17.patch