8u60 Update Release Notes

Java™ SE Development Kit 8, Update 60 (JDK 8u60)

The full version string for this update release is 1.8.0_60-b27 (where "b" means "build"), except for OS X, where the version string is 1.8.0_60-b28. The version number is 8u60.


This update release contains several enhancements and changes including the following:

IANA Data 2015e

JDK 8u60 contains IANA time zone data version 2015e. For more information, refer to Timezone Data Versions in the JRE Software.

Security Baselines

The security baselines for the Java Runtime Environment (JRE) at the time of the release of JDK 8u60 are specified in the following table:

JRE Family Version JRE Security Baseline
(Full Version String)
8 1.8.0_51
7 1.7.0_85
6 1.6.0_101

For more information about security baselines, see Deploying Java Applets With Family JRE Versions in Java Plug-in for Internet Explorer.

JRE Expiration Date

The JRE expires whenever a new release with security vulnerability fixes becomes available. Critical patch updates, which contain security vulnerability fixes, are announced one year in advance on Critical Patch Updates, Security Alerts and Third Party Bulletin. This JRE (version 8u60) will expire with the release of the next critical patch update scheduled for October 20, 2015.

For systems unable to reach the Oracle Servers, a secondary mechanism expires this JRE (version 8u60) on November 20, 2015. After either condition is met (new release becoming available or expiration date reached), the JRE will provide additional warnings and reminders to users to update to the newer version. For more information, see JRE Expiration Date.

Java SE Development Kit for ARM Release 8u60

This release includes Java Development Kit for ARM Release 8u60 (JDK 8u60 for ARM).

For ARM device support information, see Java SE Development Kit Downloads page.

For system requirements, installation instructions and troubleshooting tips, see Installation Instructions page.

Limitation: Native Memory Tracking support is limited in JDK for ARM. The java command line option XX:NativeMemoryTracking=detail is not supported for ARM targets (an error message is displayed to user). Instead, use the following option:


New Features and Changes

IBM1166 character set now available
This release adds IBM1166 character set. It provides support for cyrillic multilingual with euro for Kazakhstan. Aliases for this new character set include cp1166,ibm1166, ibm-1166, and 1166.
See JDK-8071447.

Allow use of TransmitFile on Microsoft Windows
Applications running on server editions of Microsoft Windows that make heavy use of java.nio.channels.FileChannel.transferTo may see performance improvements if the implementation uses TransmitFile. TransmitFile makes use of the Windows cache manager to provide high-performance file data transfer over sockets. The system property jdk.nio.enableFastFileTransfer controls whether the JDK uses TransmitFile on Microsoft Windows. It is disabled by default but can be enabled by setting the system property on the command line with -Djdk.nio.enableFastFileTransfer or -Djdk.nio.enableFastFileTransfer=true.
See JDK-8064407.


Allow use of SIO_LOOPBACK_FAST_PATH on Microsoft Windows

Applications running on server editions of Microsoft Windows that make heavy use of loopback connections may see latency and performance improvements if SIO_LOOPBACK_FAST_PATH is enabled. The system property jdk.net.useFastTcpLoopback controls whether the JDK enables SIO_LOOPBACK_FAST_PATH on Microsoft Windows. It is disabled by default but can be enabled by setting the system property on the command line with -Djdk.net.useFastTcpLoopback or -Djdk.net.useFastTcpLoopback=true.
See JDK-8060170.

G1 now collects unreachable Humongous objects during young collections
G1 now tries to collect humongous objects of primitive type (char, integer, long, double) with few or no references from other objects at any young collection. During young collection, G1 checks if any remaining incoming references to these humongous objects are current. G1 will reclaim any humongous object having no remaining incoming references.

Three new experimental JVM options to control this behavior that have been added with this change:

1. G1EagerReclaimHumongousObjects - This option controls whether G1 makes any attempt to reclaim unreachable humongous objects at every young GC. Default is enabled.

2. G1EagerReclaimHumongousObjectsWithStaleRefs - When this option is enabled G1 attempts to reclaim humongous objects that may have a few stale incoming references at every young GC. Default is enabled.

3. G1TraceEagerReclaimHumongousObjects - This option enables printing of some information about the collection of humongous objects at every young GC. Default is disabled.

Documentation Updates due to Nashorn Enhancements
JDK 8u60 includes new enhancements to Nashorn. As a result the following documentation changes should be read in conjunction with the current Nashorn documentation:

  • Addition:
    In the previous section, we mentioned that every JavaScript object when exposed to Java APIs implements the java.util.Map interface. This is true even for JavaScript arrays. However, this behavior is often not desired or expected when the Java code expects JSON-parsed objects. Java libraries that manipulate JSON-parsed objects usually expect arrays to expose the java.util.List interface instead. If you need to expose your JavaScript objects so that arrays are exposed as lists and not maps, you can use the Java.asJSONCompatible(obj) function, where obj is the root of your JSON object tree.

  • Correction:
    The caution mentioned at the end of Mapping Data Types section, is no longer applicable.

    Nashorn ensures that internal JavaScript strings are converted to java.lang.String when exposed externally.

  • Correction:
    The statement in the section Mapping Data Types, that mentions "For example, arrays must be explicitly converted,........." is not correct.

    Arrays are automatically converted to Java array types, such as java.util.List, java.util.Collection, java.util.Queue and java.util.Deque and so on.

Changes in Deployment Rule Set v1.2
JDK 8u60 implements Deployment Rule Set (DRS) 1.2, which includes the following changes:

  • Add "checksum" element as sub element of "id" which can allow unsigned jars to be identified by the SHA-256 checksum of the uncompressed form of a jar:

    • The "checksum" element will match only unsigned jars, and the given hash will be compared only against the uncompressed form of the jar.
    • The "checksum" element (similar to "certificate" element) has two arguments "hash" and "algorithm", however, unlike "certificate" element, the only supported value for "algorithm" is "SHA-256". Any other value provided will be ignored.
  • Allow "message" element to apply to all rule types, where previously it only applied to a block rule:

    • In a run rule, a message sub element will cause a message dialog to be displayed where without a run rule, the default behavior would be to show certificate or unsigned dialog. The message will be displayed in the message dialog.
    • In a default rule, the message will only be displayed if the default action is to block. In such a case the message will be included in the block dialog.
  • Echo "customer" blocks in the Java Console, trace files, and Java Usage Tracker records.

    • Previous to DRS 1.2, "customer" elements could be included (with any sub-elements) in the ruleset.xml file. This element and all its sub elements are ignored. In DRS 1.2, the elements are still functionally ignored. However:
      • When parsing the ruleset.xml file, all "customer" blocks will be echoed to the Java Console and deployment trace file (if Console and Tracing are enabled).
      • When using a rule, all "customer" records included within that rule will be added to the Java Usage Tracker (JUT) record (if JUT is enabled).
  • As a result of the above changes, the DTD for DRS 1.2 is as follows:

    <!ELEMENT ruleset (rule*)>
    <!ATTLIST ruleset href CDATA #IMPLIED>
    <!ATTLIST ruleset version CDATA #REQUIRED>
    <!ELEMENT rule (id, action)>
    <!ELEMENT id (certificate?, checksum?) >
    <!ATTLIST id title CDATA #IMPLIED>
    <!ATTLIST id location CDATA #IMPLIED>
    <!ELEMENT certificate EMPTY>
    <!ATTLIST certificate algorithm CDATA #IMPLIED>
    <!ATTLIST certificate hash CDATA #REQUIRED>
    <!ELEMENT checksum EMPTY>
    <!ATTLIST checksum algorithm CDATA #IMPLIED>
    <!ATTLIST checksum hash CDATA #REQUIRED>
    <!ELEMENT action (message?)>
    <!ATTLIST action permission (run | block | default) #REQUIRED>
    <!ATTLIST action version CDATA #IMPLIED>
    <!ATTLIST action force (true|false) "false">
    <!ELEMENT message (#PCDATA)>
    <!ATTLIST message locale CDATA #IMPLIED>

Bug Fixes

For a list of bug fixes included in this release, see JDK 8u60 Bug Fixes page.

The following are some of the notable bug fixes included in JDK 8u60 release:

Area: hotspot/ compiler
Synopsis: Nondeterministic wrong answer on arithmetic corrected
When performing OSR on loops with huge stride and/or initial values, in very rare cases, the tiered/server compilers could produce non-canonical loop shapes that produce nondeterministic answers when the answers should be deterministic. This issue has now been fixed.

See JDK-8072753.

Area: security-libs/org.ietf.jgss:krb5
Synopsis: dns_lookup_realm should be false by default

The dns_lookup_realm setting in Kerberos' krb5.conf file is by default false.

See 8080637.

Area: security-libs/javax.net.ssl
Synopsis: Disable RC4 cipher suites

RC4-based TLS ciphersuites (e.g. TLS_RSA_WITH_RC4_128_SHA) are now considered compromised and should no longer be used (see RFC 7465). Accordingly, RC4-based TLS ciphersuites have been deactivated by default in the Oracle JSSE implementation by adding "RC4" to "jdk.tls.disabledAlgorithms" security property, and by removing them from the default enabled ciphersuites list. These cipher suites can be reactivated by removing "RC4" form "jdk.tls.disabledAlgorithms" security property in the java.security file or by dynamically calling Security.setProperty(), and also readding them to the enabled ciphersuite list using the SSLSocket/SSLEngine.setEnabledCipherSuites() methods.

You can also use the -Djava.security.properties command line option to override the jdk.tls.disabledAlgorithms security property. For example:

java -Djava.security.properties=my.java.security ...

where my.java.security is a file containing the property without RC4:


Even with this option set from commandline, the RC4 based ciphersuites need to be re-added to the enabled ciphersuite list by using the SSLSocket/SSLEngine.setEnabledCipherSuites() methods.

See 8076221.

Area: security-libs/java.secuirty
Synopsis: Support keystore type detection for JKS and PKCS12 keystores

Keystore Compatibility Mode:
To aid interoperability, the Java keystore type JKS now supports keystore compatibility mode by default. This mode enables JKS keystores to access both JKS and PKCS12 file formats. To disable keystore compatibility mode set the Security property keystore.type.compat to the string value false.

See 8062552.

Area: core-libs/java.lang
Synopsis: Deprecate Unsafe monitor methods in JDK 8u release

The methods monitorEnter, monitorExit and tryMonitorEnter on sun.misc.Unsafe are marked as deprecated in JDK 8u60 and will be removed in a future release. These methods are not used within the JDK itself and are very rarely used outside of the JDK.

See 8069302.

Area: hotspot/jfr
Synopsis: Extract JFR recording from the core file using SA

DumpJFR is a Serviceability Agent based tool that can be used to extract Java Flight Recorder(JFR) data from the core files and live Hotspot processes. DumpJFR can be used in one of the following methods:

  • Attach DumpJFR to a live process:

    java -cp $JAVA_HOME/lib/sa-jdi.jar sun.jvm.hotspot.tools.DumpJFR <pid>
  • Attach DumpJFR to a core file:

    java -cp $JAVA_HOME/lib/sa-jdi.jar sun.jvm.hotspot.tools.DumpJFR <java> <core>

DumpJFR tool dumps the JFR data to a file called recording.jfr in the current working folder.

See 8065301(not public).

Area: tools/javac
Synopsis: Local variables named 'enum' lead to spurious compiler crashes

The javac parser is incorrectly parsing local variables with name 'enum'; this results in spurious failures when a program containing such local variables is compiled with a 'source' flag corresponding to a release in which the enum construct is not available (such as '-source 1.4').

See 8069181.

Known Issues

: auto-update (OS X 10.11+ only)
Synopsis: Auto-update error when auto-updating to earlier versions

A change in OS X 10.11 caused the auto-update mechanism to fail when a system running OS X 10.11 is auto-updated from versions 8u40 through 8u60 build 27, inclusive.  This issue was addressed in 8u60 build 28 and later.

The issue only appears when a JRE release between 8u40 and 8u60 b27 has been installed on Mac OS X 10.11 and is then used to trigger an auto-update sequence.

Impacted machines would appear to go through the update flow but at the end of the process the newer JRE would not be installed, the older JRE would remain, and therefore the auto-update mechanism would continue prompting the user to update.

Workaround: Manually install a JRE version 8u60 b28 or higher into the affected system.