Failed applying an ad-hoc signature to /usr/local/Cellar/openjdk/25/libexec/openjdk.jdk/Contents/MacOS/libjli.dylib

[cjohny]

Output of brew config

chengjin@iMac:~/Downloads$ brew config
HOMEBREW_VERSION: 4.6.16
ORIGIN: https://github.com/Homebrew/brew
HEAD: 999134536e623073ea9b2a8954eeea5898137239
Last commit: 7 days ago
Branch: stable
Core tap JSON: 09 Oct 00:28 UTC
Core cask tap JSON: 09 Oct 00:28 UTC
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_MAKE_JOBS: 4
Homebrew Ruby: 3.4.5 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/3.4.5/bin/ruby
CPU: quad-core 64-bit kabylake
Clang: 15.0.0 build 1500
Git: 2.51.0 => /usr/local/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 13.7.8-x86_64
CLT: 15.1.0.0.1.1700200546
Xcode: 15.2

Output of brew doctor

chengjin@iMac:~/Downloads$ brew config
HOMEBREW_VERSION: 4.6.16
ORIGIN: https://github.com/Homebrew/brew
HEAD: 999134536e623073ea9b2a8954eeea5898137239
Last commit: 7 days ago
Branch: stable
Core tap JSON: 09 Oct 00:28 UTC
Core cask tap JSON: 09 Oct 00:28 UTC
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_MAKE_JOBS: 4
Homebrew Ruby: 3.4.5 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/3.4.5/bin/ruby
CPU: quad-core 64-bit kabylake
Clang: 15.0.0 build 1500
Git: 2.51.0 => /usr/local/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 13.7.8-x86_64
CLT: 15.1.0.0.1.1700200546
Xcode: 15.2

Description of issue

I am using brew upgrade to upgrade openjdk from 24.0.2 to 25 on my Ventura 13.7.8 macOS.

It looks to be successful mostly, except for one error of an ad-hoc signature on a dylib file:

==> Installing openjdk
==> bash configure --disable-warnings-as-errors --with-boot-jdk-jvmargs=-Duser.home=/Users/chengjin/Library/Caches/Homebrew/java_cache --with-boot-jdk=/private/tmp/openjdk-2025
==> make images
Error: Failed applying an ad-hoc signature to /usr/local/Cellar/openjdk/25/libexec/openjdk.jdk/Contents/MacOS/libjli.dylib:
/usr/local/Cellar/openjdk/25/libexec/openjdk.jdk/Contents/MacOS/libjli.dylib: replacing existing signature
/usr/local/Cellar/openjdk/25/libexec/openjdk.jdk/Contents/MacOS/libjli.dylib: resource fork, Finder information, or similar detritus not allowed

==> Caveats
For the system Java wrappers to find this JDK, symlink it with
  sudo ln -sfn /usr/local/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk

openjdk is keg-only, which means it was not symlinked into /usr/local,
because macOS provides similar software and installing this software in
parallel can cause all kinds of trouble.

If you need to have openjdk first in your PATH, run:
  echo 'export PATH="/usr/local/opt/openjdk/bin:$PATH"' >> /Users/chengjin/.bash_profile

For compilers to find openjdk you may need to set:
  export CPPFLAGS="-I/usr/local/opt/openjdk/include"
==> Summary
🍺  /usr/local/Cellar/openjdk/25: 555 files, 373.9MB, built in 18 minutes 1 second
==> Running `brew cleanup openjdk`...
Disable this behaviour by setting `HOMEBREW_NO_INSTALL_CLEANUP=1`.
Hide these hints with `HOMEBREW_NO_ENV_HINTS=1` (see `man brew`).
Removing: /usr/local/Cellar/openjdk/24.0.2... (556 files, 371MB)
Removing: /Users/chengjin/Library/Caches/Homebrew/openjdk_bottle_manifest--24.0.2... (43.9KB)
Removing: /Users/chengjin/Library/Caches/Homebrew/openjdk--24.0.2... (208.9MB)
Removing: /Users/chengjin/Library/Caches/Homebrew/openjdk--boot-jdk--24.0.2_macos.tar.gz... (198.6MB)

After the upgrade:

chengjin@iMac:~/Desktop$ java -version
openjdk version "25" 2025-09-16
OpenJDK Runtime Environment Homebrew (build 25)
OpenJDK 64-Bit Server VM Homebrew (build 25, mixed mode, sharing)

Is this error critical? If yes, is there any solution to overcome it?

By the way, there doesn't look to be any extended attribute on this file:

chengjin@iMac:~/Desktop$ ll /usr/local/Cellar/openjdk/25/libexec/openjdk.jdk/Contents/MacOS/libjli.dylib
-rw-r--r--  1 chengjin  wheel  131104 Oct  8 20:47 /usr/local/Cellar/openjdk/25/libexec/openjdk.jdk/Contents/MacOS/libjli.dylib

[botantony]

What does xattr -l /usr/local/Cellar/openjdk/25/libexec/openjdk.jdk/Contents/MacOS/libjli.dylib say?

[cjohny]

No output at all.

chengjin@iMac:~/Desktop$ xattr -l /usr/local/Cellar/openjdk/25/libexec/openjdk.jdk/Contents/MacOS/libjli.dylib
chengjin@iMac:~/Desktop$