Add sample for session resiliency by TomaszGaweda · Pull Request #761 · hazelcast/hazelcast-code-samples

TomaszGaweda · 2026-02-09T19:45:47Z

Adds example of web session resiliency using Hazelcast Spring Session.

Checklist:

Request reviewers if possible
README.md or README.adoc is created with a description what example does and how to run it
Add tests that reproduce the associated tutorial or similar scenario

TomaszGaweda · 2026-02-09T20:02:09Z

So far it will fail - until full release

spring/resilient-sessions/pom.xml

JackPGreen · 2026-02-09T19:54:58Z

spring/resilient-sessions/README.md

@@ -0,0 +1,7 @@
+# Resilient web sessions example
+
+This example is associated with blog post.


What blog post? Can you link to it?

Not released yet :(

JackPGreen · 2026-02-09T19:55:54Z

spring/resilient-sessions/pom.xml

+<!--    <parent>-->
+<!--        <groupId>com.hazelcast.samples</groupId>-->
+<!--        <artifactId>spring</artifactId>-->
+<!--        <version>0.1-SNAPSHOT</version>-->
+<!--    </parent>-->


Why not use the parent?

It gets very confused with dependencies. Apparently now it started working, idk what was wrong...

I think it's a must that it uses the parent. The repo is barely maintainable as it is.

uses it now.

JackPGreen · 2026-02-09T19:56:21Z

spring/resilient-sessions/.gitignore

Why do we need a new (nested) .gitignore?

Just to hide file with environment variable for HZ_LICENSEKEY

Can't we add that the parent gitignore?

ok 8ab6f9a

spring/resilient-sessions/src/main/java/com/hazelcast/samples/model/Basket.java

spring/resilient-sessions/src/main/java/com/hazelcast/samples/SecurityConfig.java

spring/resilient-sessions/src/main/java/com/hazelcast/samples/ShopConfiguration.java

spring/resilient-sessions/src/main/resources/application.properties

…rties Co-authored-by: Jack Green <JackPGreen@Gmail.com>

Co-authored-by: Jack Green <JackPGreen@Gmail.com>

…AnalysisController.java Co-authored-by: Jack Green <JackPGreen@Gmail.com>

JackPGreen · 2026-02-09T20:17:15Z

@TomaszGaweda FYI still previous outstanding coments.

TomaszGaweda · 2026-02-10T19:54:17Z

I think everything is addressed now, can you please recheck? @JackPGreen

JackPGreen · 2026-02-10T19:59:49Z

spring/resilient-sessions/src/main/java/com/hazelcast/samples/AnalysisController.java

+    record SessionReminderDto(String sessionId, String userId, String timeStatus, List<BasketItem> items, BigDecimal totalPrice) {
+    }


Should this be in the model package? Seems unconventional to declare a DTO as a nested class.

Nothing special in case of Jet classes. I thought about putting it in the method itself :P

model package was meant to be the main model for the shop. I've moved the controller to new package and extracted DTO just to make things clear.

JackPGreen · 2026-02-10T20:02:53Z

spring/resilient-sessions/src/main/java/com/hazelcast/samples/AnalysisController.java

+                    var basket = s.getAttribute("basket").deserialize(hz, Basket.class);
+
+                    Instant lastAccessedTime = s.getLastAccessedTime();
+                    String timeStatus = Instant.now().isAfter(lastAccessedTime.plusSeconds(30))


Might be more readable as:
Duration.between(lastAccessedTime, Instant.now()).getSeconds() > 30

Probably less JSR-310-style though, but for a blog post...

Made it a solution in between - using Duration.between (good idea) and compareTo a constant

JackPGreen · 2026-02-10T20:03:49Z

spring/resilient-sessions/src/main/java/com/hazelcast/samples/analysis/AnalysisController.java

+                    BigDecimal totalValue = basket.items().stream()
+                                                  .map(item -> item.orderPrice().multiply(new BigDecimal(item.quantity())))
+                                                  .reduce(BigDecimal.ZERO, BigDecimal::add);


It's not immediately obvious why we need BigDecimal here. I can guess... but last time I did that I was very wrong. Maybe add a comment?

Added explanation as JavaDoc in DTO

spring/resilient-sessions/src/main/java/com/hazelcast/samples/ShopConfiguration.java

spring/resilient-sessions/pom.xml

.gitignore

…ShopConfiguration.java Co-authored-by: Jack Green <JackPGreen@Gmail.com>

Co-authored-by: Jack Green <JackPGreen@Gmail.com>

…sis-example' into add-session-resilience-and-analysis-example

JackPGreen · 2026-02-11T19:50:04Z

spring/resilient-sessions/src/main/java/com/hazelcast/samples/model/BasketItem.java

+
+/**
+ * @param product product information
+ * @param orderPrice order price of the item; {@link BigDecimal} to make floating-point errors in calculations less likely.


Is BigDecimal overkill for a code-sample?

I'd say it's something typical. After working for 5.5 years on an accounting app I iust had a muscle memory to use it :p

I think you need to work on your rounding errors.

JackPGreen · 2026-02-11T19:51:12Z

spring/resilient-sessions/pom.xml

+
+    <properties>
+        <maven.compiler.release>17</maven.compiler.release>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>


I'm sure we can inherit this?

spring/resilient-sessions/pom.xml

JackPGreen · 2026-02-12T11:30:24Z

spring/resilient-sessions/pom.xml

I haven't checked - but are any of these dependencies overlapping? E.G. does spring boot bring in spring-core?

Spring Security does not, Spring Boot does bring Spring Web, but I wanted to pin to newer version.

Co-authored-by: Jack Green <JackPGreen@Gmail.com>

TomaszGaweda added 2 commits February 9, 2026 20:38

Add sample for blog

a96895c

Add README.md

3e09174

TomaszGaweda requested review from AleksPeychev, JackPGreen and ldziedziul February 9, 2026 19:45

JackPGreen requested changes Feb 9, 2026

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TomaszGaweda and others added 6 commits February 9, 2026 21:05

Update spring/resilient-sessions/src/main/resources/application.prope…

fa9b0af

…rties Co-authored-by: Jack Green <JackPGreen@Gmail.com>

Update spring/resilient-sessions/pom.xml

a1af934

Co-authored-by: Jack Green <JackPGreen@Gmail.com>

Restore parent

5879edd

Use List.of

793cf92

Update spring/resilient-sessions/src/main/java/com/hazelcast/samples/…

3c6ed2f

…AnalysisController.java Co-authored-by: Jack Green <JackPGreen@Gmail.com>

Other styling

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TomaszGaweda requested a review from JackPGreen February 9, 2026 20:14

Remove author tag

32391aa

TomaszGaweda added 2 commits February 9, 2026 21:18

Add JavaDoc to constant

c2308d9

Update gitignore

8ab6f9a

JackPGreen reviewed Feb 10, 2026

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JackPGreen requested changes Feb 10, 2026

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TomaszGaweda and others added 6 commits February 10, 2026 21:10

Update spring/resilient-sessions/src/main/java/com/hazelcast/samples/…

9816c4e

…ShopConfiguration.java Co-authored-by: Jack Green <JackPGreen@Gmail.com>

Update .gitignore

7027410

Co-authored-by: Jack Green <JackPGreen@Gmail.com>

Update pom with TODO

6f9ff3c

Merge remote-tracking branch 'origin/add-session-resilience-and-analy…

2ce5b8d

…sis-example' into add-session-resilience-and-analysis-example

Added JavaDoc

3eeb4b4

Added JavaDoc

3735bd4

TomaszGaweda requested a review from JackPGreen February 11, 2026 15:00

TomaszGaweda added 2 commits February 11, 2026 16:45

Checkstyle

2beca3a

Remove unnecessary file modified in each build

08f647c

JackPGreen reviewed Feb 11, 2026

View reviewed changes

Remove common properties

1225e4f

JackPGreen requested changes Feb 12, 2026

View reviewed changes

Update spring/resilient-sessions/pom.xml

8e6a733

Co-authored-by: Jack Green <JackPGreen@Gmail.com>

TomaszGaweda requested a review from JackPGreen February 12, 2026 12:53

JackPGreen approved these changes Feb 12, 2026

View reviewed changes

TomaszGaweda added 4 commits February 12, 2026 14:54

Use new version

fcb425f

Update Artifact ID

42e4e62

More in readme.md

a47c70e

Restore 5.6.0 here

86b3349

TomaszGaweda merged commit 2246be3 into hazelcast:master Feb 13, 2026
3 checks passed

TomaszGaweda deleted the add-session-resilience-and-analysis-example branch February 13, 2026 11:38

		@@ -0,0 +1,7 @@
		# Resilient web sessions example

		This example is associated with blog post.

		record SessionReminderDto(String sessionId, String userId, String timeStatus, List<BasketItem> items, BigDecimal totalPrice) {
		}

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TomaszGaweda commented Feb 9, 2026

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JackPGreen commented Feb 9, 2026

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TomaszGaweda Feb 11, 2026 •

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