Regarding d1f68f1, all I did is only the following:

-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip

Other differences were automatically generated when executing the gradle command.

I've confirmed that the all samples are able to build with Java 21. I've also confirmed that I can run/try microservice-transaction-sample and spring-data-microservice-transaction-sample following their documents.

@KodaiD So, unlike the ScalarDL samples, we don't need to use Toolchain in the ScalarDB samples. Is my understanding correct? If yes, what’s the difference?

@KodaiD So, unlike the ScalarDL samples, we don't need to use Toolchain in the ScalarDB samples. Is my understanding correct? If yes, what’s the difference?

@brfrn169 Strictly speaking, we don't need to use the toolchain in both the ScalarDB sample and ScalarDL sample. But, in the update of ScalarDL sample, I tried to remove all warnings appearing when we built it.

sourceCompatibility and targetCompatibility seem to be deprecated, and the following error appears when building.

> Task :compileJava
警告: [options] ソース値8は廃止されていて、今後のリリースで削除される予定です
警告: [options] ターゲット値8は廃止されていて、今後のリリースで削除される予定です

Of course I can fix the sample to use the toolchain instead, but I think this it's outside the scope of this PR (I think the main target of this PR is making the sample to be able to build on Java 21).

@KodaiD Thank you for answering my question.

Of course I can fix the sample to use the toolchain instead, but I think this it's outside the scope of this PR (I think the main target of this PR is making the sample to be able to build on Java 21).

I think we should fix the samples to use the toolchain for consistency. Let's do that in a separate PR. Thanks.