Skip to content

fix: suppress fastjson2 Unsafe deprecation warnings on Java 23+ #382

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
fglock merged 1 commit into from
Mar 26, 2026
+15 −0
Merged

fix: suppress fastjson2 Unsafe deprecation warnings on Java 23+ #382

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 7 additions & 0 deletions jperl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,13 @@ fi
# for native system calls (file operations, process management).
JVM_OPTS="--enable-native-access=ALL-UNNAMED"

# Java 23+ warns about sun.misc.Unsafe usage (JEP 471). Add flag to suppress
# warnings from fastjson2 library.
JAVA_VERSION=$(java -version 2>&1 | head -1 | sed 's/.*version "\([0-9]*\).*/\1/')
if [ "$JAVA_VERSION" -ge 23 ] 2>/dev/null; then
JVM_OPTS="$JVM_OPTS --sun-misc-unsafe-memory-access=allow"
fi

# Note: Only include CLASSPATH if set, to avoid empty prefix that would add current dir to path
if [ -n "$CLASSPATH" ]; then
CP="$CLASSPATH:$JAR_PATH"
Expand Down
8 changes: 8 additions & 0 deletions jperl.bat
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -18,5 +18,13 @@ rem --enable-native-access=ALL-UNNAMED: Required by FFM (Foreign Function & Memo
rem for native system calls (file operations, process management).
set JVM_OPTS=--enable-native-access=ALL-UNNAMED

rem Java 23+ warns about sun.misc.Unsafe usage (JEP 471). Add flag to suppress
rem warnings from fastjson2 library.
for /f "tokens=3" %%v in ('java -version 2^>^&1 ^| findstr /i "version"') do (
for /f "tokens=1 delims=." %%m in ("%%~v") do (
if %%m GEQ 23 set JVM_OPTS=%JVM_OPTS% --sun-misc-unsafe-memory-access=allow
)
)

rem Launch Java
java %JVM_OPTS% %JPERL_OPTS% -cp "%CLASSPATH%;%SCRIPT_DIR%target\perlonjava-5.42.0.jar" org.perlonjava.app.cli.Main %*
Loading