RELEASE NOTES: JDK 20.0.1

Notes generated: Fri Oct 03 23:53:15 CEST 2025

JEPs

None.

RELEASE NOTES

security-libs/java.security

Issue Description

Issue	Description
JDK-8245654	Added Certigna(Dhimyotis) CA Certificate The following root certificate has been added to the cacerts truststore: ` + Certigna (Dhimyotis) + certignaca DN: CN=Certigna, O=Dhimyotis, C=FR`

Added Certigna(Dhimyotis) CA Certificate

The following root certificate has been added to the cacerts truststore: ` + Certigna (Dhimyotis) + certignaca DN: CN=Certigna, O=Dhimyotis, C=FR`

core-libs/java.io

Issue Description

Issue	Description
JDK-8208077	`File::listRoots` Changed to Return All Available Drives on Windows The behavior of the method `java.io.File.listRoots()` on Microsoft Windows has changed in this release so that the returned array includes a `File` object for all available disk drives. This differs from the behavior in JDK 10 to JDK 20, where this method filtered out disk drives that were not accessible or did not have media present. This change avoids performance issues observed in the previous releases and also ensures that the method is consistent with the root directories in the iteration returned by `FileSystem.getDefault().getRootDirectories()`.

JDK-8208077

`File::listRoots` Changed to Return All Available Drives on Windows

The behavior of the method java.io.File.listRoots() on Microsoft Windows has changed in this release so that the returned array includes a File object for all available disk drives. This differs from the behavior in JDK 10 to JDK 20, where this method filtered out disk drives that were not accessible or did not have media present. This change avoids performance issues observed in the previous releases and also ensures that the method is consistent with the root directories in the iteration returned by FileSystem.getDefault().getRootDirectories().

FIXED ISSUES

core-libs/java.io

Priority	Bug	Summary
P3	JDK-8208077	File.listRoots performance degradation

core-libs/java.util:i18n

Priority	Bug	Summary
P3	JDK-8299194	CustomTzIDCheckDST.java may fail at future date

docs/guides

Priority	Bug	Summary
P3	JDK-8301282	JMX simple and delegation security samples don't work because of missing access control entries

hotspot/runtime

Priority	Bug	Summary
P2	JDK-8301876	Crash in DumpTimeClassInfo::add_verification_constraint
P3	JDK-8278965	crash in SymbolTable::do_lookup
P3	JDK-8301123	Enable Symbol refcounting underflow checks in PRODUCT
P3	JDK-8295951	intermittent cmp_baseline task failures with CDS files

infrastructure

Priority	Bug	Summary
P4	JDK-8299843	Bump version numbers for 20.0.1

infrastructure/build

Priority	Bug	Summary
P4	JDK-8302879	doc/building.md update link to jtreg builds
P4	JDK-8303412	Update linux_x64-to-linux_aarch64 cross compilation devkit at Oracle

security-libs/java.security

Priority	Bug	Summary
P3	JDK-8245654	Add Certigna Root CA

tools/javac

Priority	Bug	Summary
P3	JDK-8302202	Incorrect desugaring of null-allowed nested patterns
P4	JDK-8301858	Verification error when compiling switch with record patterns