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message with a request for feedback via comments and questions there have already been some interesting responses volker simonis has replied on behalf of the amazon corretto team i d like to express our support for the new jdk lts release cadence proposal we think this is the right step forward to keep the openjdk project vibrant and relevant with benefits for both developers and enterprises martijn verburg has replied on behalf of the microsoft java engineering team we would also like to endorse the 2 year lts proposal for builds of openjdk since most of the end user ecosystem prefers to have the extra stability of an lts this is a great way to encourage them with their modernization efforts gil tene has replied on behalf of azul i d like to express our strong support for this proposal to move to a more frequent lts cadence in openjdk tene adds it does come with an extra maintenance burden for the community as a whole but that burden is well worth it in our opinion andrew hale of redhat replied so from me it s a rather nervous yes but hale discussed why the decision was nuanced and depends on the perspective taken as developers of java as well as users of it we re perhaps biased in favour of new features and we re less likely to feel the adverse effects of the upgrade treadmill from my point of view as an engineer moving to a two year lts cycle is broadly positive certifying libraries to run on a new java release can take months of effort and no one is going to welcome having to do so more frequently many of our end users have been highly resistant to upgrading to new java releases rémi forax has replied i ve discussed with quite a lot of people during this week most of them prefer a 2 year schedule for a lts 2 years is good for application developers 3 years is better for library maintainers there is at least 10x more application developers the oracle java se support roadmap has been updated to reflect the two year candence for lts releases it now states i added the emphasis oracle will designate only certain releases as long term support lts releases java se 7 8 11 and 17 are lts releases oracle intends to make future lts releases every two years meaning the next planned lts release is java 21 in september 2023 as a developer who uses the latest jdk releases for personal projects and often even plays with the openjdk early access builds and then deals with the frustration of using older versions of the jdk on different projects in my day jobs i believe that reducing the wait between lts releases from three years to two years will be welcome related resources accelerating the jdk lts release cadence moving the jdk to a two year lts cadence oracle java se support roadmap java 17 released with updates to lts schedule by dustinmarx at september 27 2021 no comments email this blogthis share to x share to facebook share to pinterest labels java general saturday september 25 2021 jdk 18 code snippets in java api documentation openjdk 18 early access build 16 2021 9 23 is now available and includes the implementation for jep 413 code snippets in java api documentation which is targeted for jdk 18 the objective of jep 413 is to introduce an snippet tag for javadoc s standard doclet to simplify the inclusion of example source code in api documentation and the jep itself covers the syntax of and features supported by the javadoc snippet tag jep 413 introduces the new snippet javadoc tag we introduce a new inline tag snippet to declare code fragments to appear in the generated documentation it can be used to declare both inline snippets where the code fragment is included within the tag itself and external snippets where the code fragment is read from a separate source file the jep has far more details on what is supported by snippet and what its syntax is this post provides a small taste of what snippet brings to javadoc based documentation and the code listings included in this post are available on github this first contrived code listing makes use of snippet package dustin examples jdk18 javadoc demonstrates code snippet javadoc tag targeted for jdk as part of jep 413 aka bug jdk 8201533 ul li https openjdk java net jeps 413 li li https bugs openjdk java net browse jdk 8201533 li ul an instance of this class is obtained via my link newinstance method rather than via a constructor snippet final snippetexample instance snippetexample newinstance highlight substring newinstance instance processit public class snippetexample no arguments constructor not intended for public use use link newinstance instead to get an instance of me snippet final snippetexample instance snippetexample newinstance highlight substring newinstance private snippetexample preferred approach for obtaining an instance of me return instance of me public snippetexample newinstance return new snippetexample performs valuable processing public void processit when the above code is run through the javadoc tool with the private option code snippets are generated in the html for the class and no arguments constructor note also that the highlighted sections have bold emphasis in the generated html generated class level documentation with snippet generated method level documentation with snippet one area where i think the snippet may be particularly useful is in package documentation a code example of use for a package description is shown in the next code listing for package info java examples and demonstrations of javadoc related capabilities the main entrypoint for the snippets example is the link snippetexample class snippet final snippetexample instance snippetexample newinstance highlight substring snippetexample link substring snippetexample newinstance target snippetexample newinstance package dustin examples jdk18 javadoc the generated html output for this package level documentation is shown in the next screenshot one of the challenges in including code snippets in javadoc based documentation has been that the tags used to present the code such as pre code and code can make the javadoc comment less readable when viewed in source directly instead of via the generated html the snippet javadoc tag can make the code presentation better for the generated html while being less distracting in the source code itself jep 413 addresses the shortcomings of current approaches for including code snippets in javadoc and summarizes how snippet addresses those shortcomings a better way to address all these concerns is to provide a new tag with metadata that allows the author to implicitly or explicitly specify the kind of the content so that it can be validated and presented in an appropriate manner it would also be useful to allow fragments to be placed in separate files that can be directly manipulated by the author s preferred editor jep 413 contains far more details on application of snippet including the ability to reference code contained in external files by dustinmarx at september 25 2021 no comments email this blogthis share to x share to facebook share to pinterest labels java 18 friday september 17 2021 java s optional does not supplant all traditional if null else or if not null else checks java s addition of java util optional has been welcome and had led to more fluent code for methods that cannot always return non null values unfortunately optional has been abused and one type of abuse has been overuse i occasionally have run across code that makes use of optional when there is no clear advantage over using null directly a red flag that can tip off when optional is being used for no advantage over checking for null directly is when calling code employs optional ofnullable t against the returned value from the method it has just invoked as with all red flags this doesn t mean it s necessarily a bad thing to pass the returned value from a method to optional ofnullable t in fact it is necessary to pass to apis expecting optional but it is common for this approach to be used to provide no real value over using the returned value directly and checking it for null before optional was available code to check for null returned from a method and acting one way for null response and another way for non null response is shown next all code snippets in this post are available on github demonstrates approach to conditional based on code null or not code null that is traditional pre link optional approach public void demonstratewithoutoptional final object returnobject methodpotentiallyreturningnull if returnobject null out println the returned object is null else out println the returned object is not null returnobject code processing non null return object goes here for this basic conditional it s rarely necessary to involve optional the next code snippet is representative of the type of code i ve occassionally seen when the developer is trying to replace the explicit null detection with use of optional demonstrates using link optional in exactly the manner code null is often used conditional on whether the returned value is empty or not versus on whether the returned value is code null or not public void demonstrateoptionalusedlikenullused final optional object optionalreturn optional ofnullable methodpotentiallyreturningnull if optionalreturn isempty out println the returned object is empty else out println the returned object is not empty optionalreturn code processing non null return object goes here the paradigm in this code is essentially the same as the traditional null checking code but uses optional isempty to perform the same check this approach does not add any readability or other advantage but does come at a small cost of an additional object instantiation and method call a variation of the above use of optional is to use its ifpresent consumer method in conjunction with its isempty method to form the same basic logic of doing one thing if the returned value is present and another thing if the returned value is empty this is demonstrated in the following code demonstrates using link optional methods link optional ifpresent consumer and link optional isempty in similar manner to traditional condition based on code null or not code null public void demonstrateoptionalifpresentandisempty final optional object optionalreturn optional ofnullable methodpotentiallyreturningnull optionalreturn ifpresent it out println the returned object is not empty it if optionalreturn isempty out println the returned object is empty this code appears bit shorter than the traditional approach of checking the returned value directly for null but still comes at the cost of an extra object instantiation and requires two method invocations further it just feels a bit weird to check first if the optional is present and then immediately follow that with a check if it s empty also if the logic that needed to be performed was more complicated than writing out a message to standard output this approach becomes less wieldy conclusion code that handles a method s return value and needs to do one thing if the returned value is null and do another thing if the returned value is not null will rarely enjoy any advantage of wrapping that returned value in optional simply to check whether it s present or empty the wrapping of the method s returned value in an optional is likely only worth the costs if that optional is used within fluent chaining or apis that work with optional by dustinmarx at september 17 2021 6 comments email this blogthis share to x share to facebook share to pinterest wednesday september 15 2021 the case of the missing jeps the jdk enhancement proposal jep process is for collecting reviewing sorting and recording the results of proposals for enhancements to the jdk and for related efforts such as process and infrastructure improvements jep 0 is the jep index of all jdk enhancement proposals known as jeps this post provides a brief overview of current jdk enhancement proposals and discusses the surprisingly mysterious disappearance of two jeps jep 187 and jep 145 jdk enhancement proposal overview the jeps in the jep index with single digit numbers are process type jeps and are currently jep 1 jdk enhancement proposal roadmap process jep 2 jep template jep 3 jdk release process the jeps in the jep index with two digit numbers are informational type jeps are are currently jep 11 incubator modules jep 12 preview features the remainder of the listed jeps with three digit numbers in the jep index are feature type jeps and currently range in number from jep 101 generalized target type inference through jep 418 internet address resolution spi new candidate jep as of this month september 2021 finally there are some jeps that do not yet have jep numbers and which are shown in the under the heading draft and submitted jeps the jeps in this state do not yet have their own jep numbers but instead are listed with a number in the jdk bug system jbs originally a jep could exist in one of several different jep 1 process states draft posted submitted candidate funded completed withdrawn rejected active the explanation of evolved potential jep states is described in jep draft jep 2 0 draft 2 this document has a workflow section that states that the revised jep process has the following states and transitions for feature and infrastructure jeps and shows a useful graphic of these workflows this document also describes the states of a feature jep draft submitted candidate proposed to target targeted integrated complete closed delivered closed rejected proposed to drop neither these documented states for feature jeps nor the additional text that describes these state transitions describes a jep with a jep number rather than a jbs number being completely removed and this is what makes the disappearance of jep 187 serialization 2 0 and jep 145 cache compiled code unexpected the disappearance of jep 187 serialization 2 0 jep 187 is not listed in the jep index but we have the following evidence that it did exist at one time original message on openjdk core libs dev mailing list 14 january 2014 internet archive wayback machine 24 june 2014 14 45 39 2 july 2014 19 39 24 mercurial changesets openjdk jep jeps changeset 194 b2f990fa2dde 187 serialization 2 0 13 january 2014 openjdk jep jeps changeset 65 5f24c115b6e6 154 remove serialization 1 april 2012 it s surprisingly difficult to find any explanation for what happened to jep 187 unlike fellow serialization related jep 154 remove serialization which has been moved to status closed withdrawn jep 187 appears to have been removed completely rather than being present with a closed withdrawn status or closed rejected status adding to the suspicious circumstances surrounding jep 187 two requests on openjdk mailing lists regarding the state of this jep 14 december 2014 on core libs dev and 6 september 2021 on jdk dev have so far gone unanswered the reasons for the complete disappearance of jep 187 can be insuated from reading the exploratory docume...
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