Use of Memory-Access Methods in sun.misc.Unsafe

[martinburger]

When I run JSignPdf, I get the following warnings:

WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::invokeCleaner has been called by com.lowagie.text.pdf.MappedRandomAccessFile (file:/[...]/JSignPdf.jar)
WARNING: Please consider reporting this to the maintainers of class com.lowagie.text.pdf.MappedRandomAccessFile
WARNING: sun.misc.Unsafe::invokeCleaner will be removed in a future release

To reproduce, run:

> java -jar /[...]/JSignPdf.jar --hash-algorithm SHA512 --visible-signature --keystore-type KEYCHAINSTORE --key-alias [...] [...].pdf

For more details, run:

> java --sun-misc-unsafe-memory-access=debug -jar /[...]/JSignPdf.jar --hash-algorithm SHA512 --visible-signature --keystore-type KEYCHAINSTORE --key-alias [...] [...].pdf
[...]
WARNING: sun.misc.Unsafe::invokeCleaner called by com.lowagie.text.pdf.MappedRandomAccessFile (file:/[...]/JSignPdf.jar)
	at com.lowagie.text.pdf.MappedRandomAccessFile.lambda$cleanJava9$0(MappedRandomAccessFile.java:226)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:74)
	at com.lowagie.text.pdf.MappedRandomAccessFile.cleanJava9(MappedRandomAccessFile.java:217)
	at com.lowagie.text.pdf.MappedRandomAccessFile.clean(MappedRandomAccessFile.java:210)
	at com.lowagie.text.pdf.MappedRandomAccessFile.close(MappedRandomAccessFile.java:185)
	at com.lowagie.text.pdf.RandomAccessFileOrArray.close(RandomAccessFileOrArray.java:299)
	at com.lowagie.text.pdf.PRTokeniser.close(PRTokeniser.java:131)
	at com.lowagie.text.pdf.PdfReader.readPdf(PdfReader.java:632)
	at com.lowagie.text.pdf.PdfReader.<init>(PdfReader.java:184)
	at net.sf.jsignpdf.SignerLogic.signFile(SignerLogic.java:167)
	at net.sf.jsignpdf.Signer.signFiles(Signer.java:246)
	at net.sf.jsignpdf.Signer.main(Signer.java:139)
[...]

• OS: macOS 15.3.2 (24D81)
• JSignPdf: 2.3.0
• Java: OpenJDK Runtime Environment Temurin-24+36 (build 24+36)

Please note that this may be related to JEP 498: Warn upon Use of Memory-Access Methods in sun.misc.Unsafe.

This may be fixed in newer versions of OpenPDF.

[risto42]

I have similar on x86_64 running EndeavourOS and openjdk24

$ uname -a
Linux envyx 6.13.8-arch1-1 #1 SMP PREEMPT_DYNAMIC Sun, 23 Mar 2025 17:17:30 +0000 x86_64 GNU/Linux
$ sudo archlinux-java status
Available Java environments:
  java-24-openjdk (default)
$ pacman -Qs jsignpdf
local/jsignpdf 2.3.0-1
    Digitally sign PDF files with X.509 certificates in GUI and CLI.
$ jsignpdf
WARNING: package sun.security.action not in java.base
PRÉCIS Relaxing SSL security.
PRÉCIS Registering SunPKCS11 provider from configuration in conf/pkcs11.cfg
PRÉCIS PKCS11 provider registered with name SunPKCS11-JSignPdf
GRAVE Unable to register SunPKCS11 security provider.
java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:74)
        at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:483)
        at net.sf.jsignpdf.utils.PKCS11Utils.initPkcs11Provider(PKCS11Utils.java:110)
        at net.sf.jsignpdf.utils.PKCS11Utils.registerProviders(PKCS11Utils.java:67)
        at net.sf.jsignpdf.Signer.main(Signer.java:104)
Caused by: java.lang.NoClassDefFoundError: sun/security/action/GetPropertyAction
        at com.github.kwart.jsign.pkcs11.Config.<clinit>(Config.java:64)
        at com.github.kwart.jsign.pkcs11.JSignPKCS11.<init>(JSignPKCS11.java:130)
        at com.github.kwart.jsign.pkcs11.JSignPKCS11.<init>(JSignPKCS11.java:104)
        at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)
        ... 5 more
Caused by: java.lang.ClassNotFoundException: sun.security.action.GetPropertyAction
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490)
        ... 9 more

WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::invokeCleaner has been called by com.lowagie.text.pdf.MappedRandomAccessFile (file:/usr/share/java/jsignpdf/JSignPdf.jar)
WARNING: Please consider reporting this to the maintainers of class com.lowagie.text.pdf.MappedRandomAccessFile
WARNING: sun.misc.Unsafe::invokeCleaner will be removed in a future release
Wrong value in complex
INFOS Lancement de PDF Signer
INFOS Vérification des chemins des fichiers d'entrée/sortie
INFOS Lecture de l'alias de la clé
INFOS Utiliser un alias pour la clé : Richard PALO-CertEurope eID U #1
INFOS Lecture de la clé privée
INFOS Lecture de la chaîne de certification.
INFOS Ouverture du fichier PDF
INFOS Création du fichier PDF
INFOS Signature
INFOS Paramètre du niveau de certification
INFOS Configuration de l'affichage de la signature
INFOS Utiliser seulement les calques définis par Acrobat 6: true
INFOS Creation dune image {0}
INFOS Paramètre de l'image
INFOS Echelle de l'image de fond
INFOS Paramètre du calque 2 texte (description)
INFOS Paramètre du calque 4 texte (état)
INFOS Paramètre du mode de rendu
INFOS Création de l'attache de signature, visible dans le document
INFOS En cours d'exécution. Merci de patienter quelques instants.
PRÉCIS KeyStore type PKCS11 is supported by the provider SunPKCS11-JSignPdf
INFOS Fermeture du PDF
INFOS Opération terminée. Signature du fichier PDF réussie.

the program does not permit exiting normally, so I need to always kill it off.