Java 21: Pattern Matching + StringTemplate JEP-430 + Unnamed JEP-445 by npeters · Pull Request #935 · palantir/palantir-java-format

npeters · 2023-10-03T01:05:10Z

Before this PR

May error on parsing Java 21 file.

After this PR

Support of different JEP of Java 21 and preview

JEP-430 StringTemplates
JEP-440 Record Patterns
JEP-441 Pattern Matching switch (with guard)
JEP-443 Unamed Pattern

Possible downsides?

Build

I added a independent gradle module to build all Java 21 code but the gradle do not support to build groovy code with java 21: it should be first compile with java 17 and you can compile the project with java 21 😞
I added a hack on palantir-java-format gradle script to copy all the java 21 class file on the jar. 😞
Need to add --enable-preview with Java 21.

Code

"StringTemplates" was really hard to support: I did some change on JavaInput.java and visitStringTemplate. The complexity of this part is really to high.
I copy and past "visitCase" from Java14 file and the guard param.

palantirtech · 2023-10-03T01:05:12Z

Thanks for your interest in palantir/palantir-java-format, @npeters! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

changelog-app · 2023-10-03T01:05:13Z

Generate changelog in `changelog/@unreleased`

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and external consumers of the service's API (e.g. customer-written software or integrations).
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Type

Description

Java 21: Pattern Matching + StringTemplate JEP-430 + Unnamed JEP-445

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npeters · 2023-10-03T01:25:43Z

The build is so painful... I push all the jar / idea-plugin https://github.com/npeters/palantir-java-format/releases/tag/java21-draft.

npeters · 2023-10-03T01:27:31Z

link to #934 #933 #931

kittech0 · 2023-10-27T08:26:54Z

great job, now gotta wait for approval

koppor

I was going to use palantir-java-format and saw this PR. I read through and commented on code changes appearing unusual to me. Feel free to use or to ignore - I am not affiliated with the project, just some Java project lead.

koppor · 2023-10-28T19:01:46Z

-    sourceCompatibility = 11
-    targetCompatibility = 11


I would keep as is - and remove the "duplicate" settings in the sub projects.

koppor · 2023-10-28T19:02:35Z

+java{
+    sourceCompatibility = 11
+    targetCompatibility = 11
+}


This can be removed (because configured globally)

koppor · 2023-10-28T19:02:41Z

+java{
+    sourceCompatibility = 11
+    targetCompatibility = 11
+}
+


This can be removed (because configured globally)

koppor · 2023-10-28T19:02:49Z

+java{
+    sourceCompatibility = 11
+    targetCompatibility = 11
+}
+


This can be removed (because configured globally)

koppor · 2023-10-28T19:03:10Z

+java{
+    sourceCompatibility = 11
+    targetCompatibility = 11
+}
+


This can be removed (because configured globally)

koppor · 2023-10-28T19:06:32Z

+                if (stringFragmentKind) {
+                    stringFragmentEndPos = t.endPos();
+                }
+


Remove empty line

koppor · 2023-10-28T19:06:40Z


    /** Skips over extra semi-colons at the top-level, or in a class member declaration lists. */
    protected void dropEmptyDeclarations() {
+


Remove empty line

koppor · 2023-10-28T19:07:03Z

@@ -1,4 +1,4 @@
-import a.A;;
+import a.A;


Why was the test input changed?

";;" is not valid on java 21.
"Disallow Extra Semicolons Between "import" Statements"
https://www.oracle.com/java/technologies/javase/21-relnote-issues.html#JDK-8027682

I was not able to disable the test only for Java21

koppor · 2023-10-28T19:07:15Z

@@ -1,4 +1,4 @@
-package foo;;
+package foo;


Why was the test input changed?

";;" is not valid on java 21.
"Disallow Extra Semicolons Between "import" Statements"
https://www.oracle.com/java/technologies/javase/21-relnote-issues.html#JDK-8027682

I was not able to disable the test only for Java21

koppor · 2023-10-28T19:08:51Z

+        Void r = scan(node.getDeconstructor(), unused);
+        token("(");
+
+        // r = scanAndReduceVoid(, unused, r);


What does this comment mean?

I remove it

talios · 2023-11-05T19:49:13Z

Has there been any progress on this PR? Would love to see a new release supporting Java 21.

CRogers · 2023-11-17T14:22:23Z

Thanks for submitting this PR - although we're unlikely to be able review it/actually support Java 21 in palantir-java-format by the end of the year. There's a significant amount of other work we need to do on our internal repos (currently ongoing) before we can start using Java 21 source features and these take priority. Unfortunately, we are quite resource constrained at the moment.

Until then, you may be able to use something like jitpack (https://jitpack.io/) if it is allowed by your organisation to use this commit hash until we are in a place to review/merging/supporting it.

koppor · 2023-11-20T15:18:28Z

The build is so painful... I push all the jar / idea-plugin npeters/palantir-java-format@java21-draft (release).

Is there also a chance for the gradle plugin? I also hit some issues and would like to test if the modification works with https://github.com/JabRef/jabref/blob/39569344d4051ac958e4fc5edda89866d0706498/src/main/java/org/jabref/gui/fieldeditors/identifier/IdentifierEditor.java#L63. (which is issue #952)

npeters · 2023-11-20T16:33:06Z

+
+
+    switch (something){
+        case Integer i when i > 10-> System.out.println(i.toString());


the #952 should be fix and the test is here

npeters · 2023-11-20T16:35:04Z

yes, the PR should manage the #952. It is part of 'JEP-441 Pattern Matching switch (with guard)' .
There are already a test on the guard: sample is I961.

wb459 · 2024-02-21T14:37:54Z

@CRogers Is there any news regarding when the team will have the capacity to review this PR?

bmarwell · 2024-03-03T13:34:41Z

Thanks for submitting this PR - although we're unlikely to be able review it/actually support Java 21 in palantir-java-format by the end of the year.

End of WHICH year? 😄
Jokes aside – can you nominate more maintainers? A few ASF projects like maven use palantir and we would like to have property formatted source code. Maybe one of them could get access to palantir PRs and releases?

talios · 2024-04-07T02:18:21Z

In relation to this - StringTemplates as we currently no them are 100% dead and will not be in JDK 23, even under --enable-preview: https://mail.openjdk.org/pipermail/amber-spec-experts/2024-April/004106.html

anbonifacio · 2024-04-08T09:06:34Z

Maybe a smaller scope would be easier to review? What about limiting the support to the new pattern matching features like case null, defaut ->?

koppor · 2024-04-08T11:26:31Z

As far as I understand the whole setting, the whole endeavor is blocked by the release of version 2.0 of the IntelliJ Gradle Plugin, because of the fix JetBrains/intellij-platform-gradle-plugin#1494 is needed.

(Source: #997)

npeters · 2024-04-27T10:23:13Z

@koppor How can I assist you?
This PR seems too complex to merge and I understand.
Perhaps a better approach would be as follows:

Create one pull request with a Gradle configuration build that includes multi-compilation tasks and multi-test task, each targeting a specific JDK version.
Submit another pull request containing the Java code and associated tests

@koppor If you agree with this plan. I can try to do it.

npeters · 2024-04-27T10:27:40Z

@talios thank you for the point. We need to create a InputAstVisitor class for each java version.

xhyrom · 2024-05-12T16:49:10Z

How it's looking?

RealYusufIsmail · 2024-05-25T20:00:28Z

Yo, any updates in regard to the following changes.

siepkes · 2024-10-18T12:44:51Z

Since String templates was removed from JDK 23 (see: Update on String Templates (JEP 459) it should probably be removed from this PR?

npeters · 2024-11-02T17:40:06Z

Currently I am using this PR on my project and it works fine: so the java code work correctly.
I think the build is the problem: the second project and the hack to copy the class to jar are really bad.

Gradle has been updated and it is possible to support Java 21.

I completely rewrite the system:

I split the code for java 21 and java 21 preview,
I create sourceset for java21 and java21preview
the jar is now correctly built.

npeters · 2025-01-08T23:13:49Z

Hi @koppor.
can you please have a look on PR.

koppor · 2025-02-06T22:24:24Z

@npeters I am not the maintianer of this project. It seems that there is some internal development going oin (according to #952 (comment)).

koppor · 2025-03-04T10:40:42Z

Related PR: #1211

heruan · 2025-09-02T09:04:37Z

Is this PR still active? Any plans to merge it? It's been a while tools like SonarQube suggest using unnamed variables like _, but Palantir Java Format fails on those.

bmarwell · 2025-09-02T14:11:16Z

I created jdtfmt, since this project seems not much alive. I contacted the authors without luck.

jdtfmt is based on the eclipse formatter, so it works the same on the command line. You can also use the configuration with spotless + eclipse jdt.

koppor reviewed Oct 28, 2023

View reviewed changes

koppor mentioned this pull request Nov 17, 2023

Switch to palantir-java-format JabRef/jabref-koppor#663

Closed

9 tasks

koppor mentioned this pull request Nov 20, 2023

Java 21 / JEP 441: Pattern Matching for switch result in com.palantir.javaformat.java.FormatterException #952

Open

npeters commented Nov 20, 2023

View reviewed changes

koppor mentioned this pull request Dec 5, 2023

Incompatible with JDK 21 #931

Open

npeters mentioned this pull request Apr 27, 2024

Gradle: Multi Compilation 21< and 21 #1079

Closed

npeters force-pushed the feature/java-21 branch from 396d2aa to 182fd9a Compare April 27, 2024 21:04

Sparky983 mentioned this pull request Jul 27, 2024

Switch to Google Java Format Sparky983/vision-gui#219

Merged

java21:reworks all the packaging

56b6eab

npeters force-pushed the feature/java-21 branch from 182fd9a to 56b6eab Compare November 2, 2024 17:22

koppor mentioned this pull request Mar 4, 2025

Incompatible with JDK 21 #934

Open


		/** Skips over extra semi-colons at the top-level, or in a class member declaration lists. */
		protected void dropEmptyDeclarations() {



		switch (something){
		case Integer i when i > 10-> System.out.println(i.toString());

Conversation

npeters commented Oct 3, 2023 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Before this PR

After this PR

Possible downsides?

Build

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changelog-app Bot commented Oct 3, 2023

Generate changelog in changelog/@unreleased

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npeters commented Oct 3, 2023

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talios commented Nov 5, 2023

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koppor commented Nov 20, 2023 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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npeters commented Nov 20, 2023

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npeters commented Apr 27, 2024

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xhyrom commented May 12, 2024

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siepkes commented Oct 18, 2024

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npeters commented Oct 3, 2023 •

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Generate changelog in `changelog/@unreleased`

koppor commented Nov 20, 2023 •

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