OpenJDK
openjdk.org › jeps › 430
JEP 430: String Templates (Preview)
September 17, 2021 - Enhance the Java programming language with string templates. String templates complement Java's existing string literals and text blocks by coupling literal text with embedded expressions and template processors to produce specialized results. This is a preview language feature and API.
OpenJDK
openjdk.org › jeps › 459
JEP 459: String Templates (Second Preview)
August 14, 2023 - String Templates were originally proposed as a preview feature by JEP 430 in JDK 21. We here propose a second preview in order to gain additional experience and feedback. Except for a technical change in the types of template expressions, there are no changes relative to the first preview.
String Templates are a preview feature in Java 21 - not working with Eclipse - Stack Overflow
I've got Eclipse 2023-09 installed. JDK-21 installed. Java 21 support plugin installed. In Eclipse set my project->Properties->Java Compiler->Enable preview features on. public class More on stackoverflow.com
There will be no String Template in JDK 23.
wow. It's interesting that Brian Goetz recently said he was ready to finalize the feature and move on, and all the complaints were nothing they hadn't anticipated and discussed extensively. They had the JEP submitted to finalize this for Java 22 and they held off to a second unchanged preview, and then were going to finalize for Java 23, and now, even Goetz is ready to move the whole thing back to a complete redesign. As a Java dev I'd rather get this later with a better design than earlier with a less perfect design. It is interesting how close the existing design was to being finalized. The preview system works :) More on reddit.com
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April 6, 2024java - Why is String template not available - Stack Overflow
I updated my JDK to JDK 23 and ... the java.lang.StringTemplate class doesn't exist which I can confirm even after manually looking for the StringTemplate in the JDK 23 library. Is anyone else missing this class or is it probably an issue with my JDK? The exact warning message is: ... How do you build your code? You probably have --target set to something lower than 23. ... JDK 23 Release Notes: "String Templates were first previewed in JDK 21 ... More on stackoverflow.com
String.format() is 3x faster in Java 17
Glad to see some of the small enhancements we did in 17 get recognition. Not sure if this one matters, but String::format shows up in profiles every now and then so it felt reasonable to me to give it some TLC in between larger projects. More on reddit.com
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October 30, 2021Videos
14:44
String Templates - Syntactic sugar or useful improvement? - YouTube
r/java on Reddit: What Happened to Java's String Templates? Inside ...
Are You Using This NEW Java Feature? - YouTube
Java String Templates Explained! Master This Short-Lived ...
09:18
Java 21 String Templates | Java 21 New Features - YouTube
14:43
What Happened to Java's String Templates? Inside Java Newscast ...
Baeldung
baeldung.com › home › java › java string › string templates in java
String Templates in Java | Baeldung
July 7, 2025 - A template processor is responsible for evaluating the embedded expression (the template), and combining it with the String literal at runtime to produce the final String. Java provides the ability to use an inbuilt template processor provided by Java, or to switch it with a custom processor of our own. This is a preview feature in Java 21; therefore, we’d have to enable preview mode.
Oracle
docs.oracle.com › en › java › javase › 21 › docs › api › java.base › java › lang › StringTemplate.html
StringTemplate (Java SE 21 & JDK 21)
January 20, 2026 - Preview features may be removed in a future release, or upgraded to permanent features of the Java platform. StringTemplatePREVIEW is the run-time representation of a string template or text block template in a template expression.
OpenJDK
openjdk.org › jeps › 465
JEP 465: String Templates (Third Preview)
January 9, 2024 - String templates complement Java's existing string literals and text blocks by coupling literal text with embedded expressions and template processors to produce specialized results. String Templates were originally proposed as a preview feature by JEP 430, delivered in JDK 21, and previewed ...
Oracle
docs.oracle.com › javase › specs › jls › se21 › preview › specs › string-templates-jls.html
String Templates (Preview)
2 weeks ago - This document describes changes to the Java Language Specification to support String Templates, a preview feature of Java SE 21.
Stack Overflow
stackoverflow.com › questions › 77255354 › string-templates-are-a-preview-feature-in-java-21-not-working-with-eclipse
String Templates are a preview feature in Java 21 - not working with Eclipse - Stack Overflow
javac --enable-preview --source 21 StringTemplates.java java --enable-preview --source 21 StringTemplates.java
Oracle
docs.oracle.com › en › java › javase › 21 › language › string-templates.html
4 String Templates
January 16, 2025 - An embedded expression is a Java ... the literal text in the template with the values of the embedded expressions to produce a result. See the StringTemplate interface in the Java SE API specification for more information. Note:This is a preview feature....
JetBrains
blog.jetbrains.com › idea › 2023 › 11 › string-templates-in-java-why-should-you-care
String Templates in Java - why should you care? | The IntelliJ IDEA Blog
November 27, 2023 - Basic support for Java 21 is available since IntelliJ IDEA version 2022.2.2. More support is added in its “2023.3 release, due for release very soon. To use String Templates, go to ProjectSettings | Project, set the Project SDK to 21 and set Project language level to ‘‘21 (Preview) – String templates, unnamed classes and instance main methods etc.’:
Reddit
reddit.com › r/java › there will be no string template in jdk 23.
r/java on Reddit: There will be no String Template in JDK 23.
April 6, 2024 -
"there will be no string template feature, even with --enable-preview, in JDK 23" https://mail.openjdk.org/pipermail/amber-spec-experts/2024-April/004106.html
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wow. It's interesting that Brian Goetz recently said he was ready to finalize the feature and move on, and all the complaints were nothing they hadn't anticipated and discussed extensively. They had the JEP submitted to finalize this for Java 22 and they held off to a second unchanged preview, and then were going to finalize for Java 23, and now, even Goetz is ready to move the whole thing back to a complete redesign. As a Java dev I'd rather get this later with a better design than earlier with a less perfect design. It is interesting how close the existing design was to being finalized. The preview system works :)
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TBH I would be totally fine with C# style (dolar-prefix of string and expression): $"{x} plus {y} equals {x + y}" Clearly indicated intention, no issue with conflict with legacy strings...
nipafx
nipafx.dev › inside-java-newscast-71
What Happened to Java's String Templates? Inside Java Newscast #71 // nipafx
JDK 21 and 22 previewed string templates, a language feature that makes it easier to safely embed variables in structured languages like SQL, HTML, JSON, etc. I assume you know its outlines and understand how it embedded variables and how it required template processors to turn those templates into strings or other arbitrary objects.
Published June 20, 2024
Oracle
docs.oracle.com › javase › specs › jls › se22 › preview › specs › string-templates-jls.html
String Templates (Second Preview)
September 16, 2025 - This document describes changes to the Java Language Specification to support String Templates, a preview feature of Java SE 22.
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The string template was a preview feature in Java 21 and Java 22, and has been withdrawn for further redesign. In other words, this feature never existed in mainline Java (you needed to enable preview features to use it), and now with the release of Java 23, it doesn't exist at all.
If you get recommendations from IntelliJ to use string templates, you either need to update IntelliJ (it shouldn't suggest this at all for Java 23), or possibly you have set your language level to "21 (Preview)" or "22 (Preview)", instead of normal (non-preview) language level "21", "22" or "23". In other words, go to File, Project Structure, and on Project check the language level, and double-check for individual Modules (on their "Sources" tab).
As an aside, recent Java versions already optimize string concatenation like "The capital city of " + index + " is " pretty well by replacing it with a low-level form of templating in the compiled bytecode.
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String Templates were a preview feature of Java 21/22 and were removed in Java 23. The reason given was:
After some experience with the prototype, it became clear that the processor-centric nature of the proposed design was confusing to users and lacked the desired compositionality.
Earlier versions of IntelliJ (2024.1?) were not yet fully aware of all the features of Java 23. As of recent versions (2024.2.2 or possibly earlier) it is now fully compatible with Java 23 and will no longer suggest string templates.
How to do in Java
howtodoinjava.com › home › java 21 string templates
Java 21 String Templates (with Examples)
July 30, 2024 - Similar to other programming languages, Java template strings can include variables, methods or fields, computed at run time, to produce a formatted string as output. String Templates (JEP-430) is a preview feature in Java 21.
Java Almanac
javaalmanac.io › features › stringtemplates
String Templates (JEP 430, 459, 465, withdrawn) - javaalmanac.io
String templates, previewed in Java 21 and 22, are a mechanism for producing objects from templates that contain string fragments and embedded expressions. The syntax is different from that of other languages, but the differences are minor and ...
Medium
medium.com › @ucgorai › string-templates-in-java-21-simplifying-string-construction-9ba9866ff510
String Templates in Java 21: Simplifying String Construction | by Uma Charan Gorai | Medium
June 19, 2025 - String Templates (introduced as a preview feature in Java 21) enhance how you embed dynamic values inside strings, making them more readable, secure, and powerful than traditional string concatenation or String.format().
OpenJDK
bugs.openjdk.org › browse › JDK-8329949
[JDK-8329949] Remove the String Templates preview feature
As there's no clear consensus on how to re-design the feature, we have come to the position that it would be more prudent to drop it for the time being. String templates will not be a feature of Java 23, even as a preview feature.
Oracle
docs.oracle.com › en › java › javase › 22 › docs › api › › java.base › java › lang › StringTemplate.html
StringTemplate (Java SE 22 & JDK 22)
July 16, 2024 - Preview features may be removed in a future release, or upgraded to permanent features of the Java platform. StringTemplatePREVIEW is the run-time representation of a string template or text block template in a template expression.
Prgrmmng
prgrmmng.com › home › series › java strings › mastering string templates in java 21 – a complete guide to the new preview feature
Mastering String Templates in Java 21 – A Complete Guide to the New Preview Feature | prgrmmng.com
August 14, 2025 - String Templates allow you to embed expressions directly within a string using a new, template-aware syntax. They were added in Java 21 under Preview Feature mode, meaning they must be explicitly enabled at compile time.
Medium
medium.com › @kaustubh.saha › string-templates-in-java-21-and-22-46413472c2b3
String Templates in Java 21 and 22 | by Kaustubh Saha | Medium
December 4, 2025 - If you are on JDK 21/22 (Preview): STR works exactly as described above. If you are on JDK 23+: The feature may be absent or require a different syntax depending on the finalization of the new JEP. A new version of String Templates will likely return in a future JDK, but the syntax or the mechanism might undergo some changes