CDS allows a set of classes to be pre-processed into a shared archive file. JEP 350: Dynamic CDS ArchivesĬDS stands for Class-Data Sharing. More details can be found on the official JEP page. However, the old implementation and the system property are going to be removed in one of the next JDK releases. If something goes wrong, the users can switch back to the old implementation by setting system property. Fortunately, the authors know about such a risk, and they won’t remove the old implementation.
#JAVA 14 TEXT BLOCKS UPDATE#
Most likely JDK users are not going to see a big difference if the update doesn’t introduce a regression. Note that the JEP doesn’t touch the underlying implementation of. In the context of a future world of fibers that park instead of blocking threads in native methods, the current implementation is not fit for purpose.įrom the description above, it looks like the update should make it easier to develop JDK. The implementation also has several concurrency issues that require an overhaul to address properly. The implementation uses a native data structure to support asynchronous close, a source of subtle reliability and porting issues over the years. The implementation uses the thread stack as the I/O buffer, an approach that has required increasing the default thread stack size on several occasions.
#JAVA 14 TEXT BLOCKS CODE#
The implementation is a mix of legacy Java and C code that is painful to maintain and debug. The and APIs, and their underlying implementations, date back to JDK 1.0. Here is how the authors of the JEP explain why the update is necessary: Although someone may not use these APIs directly, this update will likely affect almost everybody who uses JDK because the Java sockets are the main APIs for networking. This JEP replaces the underlying implementation of the and APIs. JEP 353: Reimplement the Legacy Socket API JEP 354 discusses similar topics which were discussed in JEP 325. To enable the new syntax, you’ll have to run the Java compiler with -enable-preview -release 13 options, and then launch java with -enable-preview option (see the example above). The new switch expressions are still available only in preview mode. Here is an example which shows how the new yield statement may be used: To yield a value from a switch expression, the break with value statement is dropped in favor of a yield statement. In the new version of switch expressions, this will be replaced with a new yield statement. In the previous preview version of switch expressions it was proposed to add a new form of the break statement with a value which would be used to yield a value from a switch expression. The collected feedback resulted in JEP 354 that makes only one change. You can find more details in the previous post.Īfter the new syntax was introduced in JDK 12, a request for feedback was sent to the jdk-dev mailing list.
Making a long story short, JEP 325 added a new simplified form of a switch block with case L -> labels. This is an update for JEP 325 which introduced new switch expressions in JDK 12 as a preview language feature. You’re welcome to learn more about the text blocks in Java. Furthermore, the JEP adds three new methods: String::stripIndent(), String::translateEscapes() and String::formatted(Object… args). $ java -classpath classes -enable-preview TestĮven though the new feature may look simple, JEP 355 discusses quite a lot of important topics around the new text blocks such as line terminators, indentation, incidental white space, escape sequences, concatenation.
MemoryAddress new offset = 100 new length = 4Īt /.checkBounds(MemorySegmentImpl.java:199)Īt /.checkRange(MemorySegmentImpl.java:178)Īt /.checkAccess(MemoryAddressImpl.java:84)Īt java.base/.checkAddress(VarHandleMemoryAddressAsInts.java:50)Īt java.base/.set0(VarHandleMemoryAddressAsInts.java:85)Īt java.base/0/t(Unknown Source)Īt java.base/.guard_LI_V(VarHandleGuards.java:114)Īt 370OffHeap.main(JEP370OffHeap.$ javac -d classes -enable-preview -release 13 Test.java And when running it: >java -enable-preview -add-modules 370OffHeap
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