The new six-month absolution accent of the JDK agency that afore we’ve alike absolutely ample out what the new appearance are in JDK 10 forth comes JDK 11. I acquaint an beforehand blog area I listed all 109 new appearance and APIs I could acquisition in JDK 10, so it seemed attainable to do the aforementioned affair for JDK 11. I’m activity to use a altered architecture from the antecedent post. In this series, I accept disconnected aggregate into two sections: appearance that are arresting to developers and aggregate else. This additional chapter focuses on aggregate abroad — from nest-based admission ascendancy to debris collectors and more.
Java (and added languages) supports nested classes through close classes. To accomplish this assignment correctly, it requires the compiler to accomplish some tricks. Here’s an example:
The compiler modifies this to actualize article like this afore assuming compilation:
Although, logically, the close chic is allotment of the aforementioned blank article as the alien class, it is aggregate as a abstracted class. It, therefore, requires a constructed arch adjustment to be created by the compiler to accommodate admission to the clandestine acreage of the alien class.
This JEP introduces the abstraction of nests, area two associates of the aforementioned backup (Outer and Close from our example) are nestmates. Two new attributes are authentic for the chic book format, NestHost and NestMembers. These changes are advantageous for added languages that abutment nested classes and are aggregate to bytecodes.
This affection introduces three new methods to the java.lang.Class:
This affection additionally appropriate changes to the Java Virtual Machine Specification (JVMS), accurately in area 5.4.4, Admission Control.
This JEP describes an addendum to the chic book architecture to abutment a new constant-pool form, CONSTANT_Dynamic (often referred to in presentations as “condy”). The abstraction of a activating connected seems to be an oxymoron, but, essentially, you can anticipate of it as a final amount in Java. The constant-pool amount is not set at compile-time (unlike the added constants) but uses a bootstrap adjustment to actuate the amount at runtime. The amount is, therefore, activating but, back its amount is alone set once, it is additionally constant.
This affection is primarily aimed at bodies developing new languages and compilers that will accomplish bytecodes and chic files as an achievement to be run on the JVM. It simplifies some of the tasks appropriate for this.
This affection introduces a new class, java.lang.invoke.ConstantBootstraps, with nine new methods. I won’t account them all here; these are the bootstrap methods for dynamically computed constants.
This affection appropriate changes to the JVMS, accurately in the areas of how the invokespecial bytecode is acclimated and area 4.4, The Connected Pool.
This was a JEP contributed by Red Hat. The JVM is now able to booty advantage of added of the specialized instructions attainable in the Arm 64 apprenticeship set. Specifically, this improves achievement of the sin(), cos(), and log() methods of the java.lang.Math class.
Red Hat additionally contributed this JEP. The Epsilon beneficiary is somewhat unusual, in that it does not aggregate any garbage! It will admeasure memory, as appropriate back new altar are instantiated, but it does not accost any amplitude active by unreferenced objects.
When you aboriginal attending at this, you anticipate what is the point of that? It turns out that there are two uses:
If the abundance amplitude is exhausted, the JVM can be configured to abort in one of three ways:
Cryptographic standards are consistently alteration and improving. In this case, the absolute elliptic-curve Diffie-Hellman arrangement is actuality replaced by Curve25519 and Curve448. This is the key acceding arrangement authentic by RFC-7748.
The Java belvedere supports Unicode to accredit all appearance sets to be processed. Back Unicode has been adapted to adaptation 10, the JDK has additionally been adapted to abutment this afterlight to the standard.
I’m consistently absorbed to see what the Unicode maintainers acquisition to accommodate in new versions. Unicode 10 has 8,518 new syms. This includes the Bitcoin sym, the Nüshu appearance set (used by Chinese women to address poetry), as able-bodied as Soyombo and Zanabazar Square (which are characters acclimated in celebrated Buddhist texts to address Sanskrit, Tibetan, and Mongolian). There are additionally added emojis, including the long-awaited (apparently) Colbert Emoji.
Remember that, back JDK 9, you can use UTF-8 in acreage files. This agency any Unicode appearance can be acclimated in a acreage file, including emojis or Nüshu.
Flight Recorder is a low-overhead abstracts accumulating framework for the JVM. Prior to JDK 11, this was a bartering affection in the Oracle JDK binary. Now that Oracle is eliminating anatomic differences amid the Oracle JDK and one congenital from OpenJDK antecedent code, this affection has been contributed to the OpenJDK.
There are four genitalia to this:
There are two new modules for this: jdk.jfr and jdk.management.jfr.
Similar to JEP 324, this is an afterlight of ciphers acclimated by the JDK. In this case, apparatus the ChaCha20 and ChaCha20-Poly1305 ciphers as authentic in RFC 7539. ChaCha20 is a almost new beck blank that can alter the older, afraid RC4 beck cipher.
Somewhat surprisingly, this is a JEP contributed by Google. This provides a way to get advice about Java article abundance allocations from the JVM that:
TLS 1.3 (RFC 8446) is a above check of the TLS agreement and provides cogent aegis and achievement improvements over antecedent versions. The JDK now supports this, although this does not extend to Datagram Transport Layer Aegis (DTLS).
This is a new, beginning debris beneficiary advised for use with applications that crave a ample (multi-gigabyte) abundance and low-latency. It uses a distinct bearing abundance (which is a bit unusual, accustomed the accustomed acumen of the Weak Generational Hypothesis) and performs best (but not all) of the GC assignment accordingly with the application. It does this through the use of a read-barrier that intercepts anniversary apprehend to an article from the appliance and ensures that the advertence alternate is correct. This eliminates the affair of actuality able to backpack altar accordingly while appliance accoutrement are running.
ZGC is region-based (like G1), NUMA aware, and compacting. It is not advised as a general-purpose collector.
If you appetite a absolutely pauseless beneficiary with low-latency, I can agreeably acclaim C4 in our Zing JVM.
Pack200 is a compression arrangement for JAR files alien in Java SE 5.0. With the addition of the JPMS in JDK 9, Pack200 is no best acclimated to abbreviate the JDK itself. The pack200, unpack200 tools, and the Pack200 API in java.util.jar are now deprecated and may be removed in a approaching adaptation of the JDK. Back this will appear has not been specified.
JDK 11 is the aing LTS absolution of the JDK (as authentic by Oracle and actuality followed by anybody else). Although there are not a lot of developer-focused features, there’s a lot activity on lower bottomward in the JVM, laying the background for future, added arresting features.
Our Zulu builds of JDK 11 can be begin actuality and are absolutely free!
Is it time to alpha brief your applications to JDK 11? Let us apperceive in the comments below!
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