okhttp 5 Kotlin metadata is too new for "compatible" Gradle versions

[3flex]

This plugin uses okhttp 5. This is built with Kotlin 2.2.0 (with language version 2.2).

Although this plugin sets language version 1.8, the dependency on okhttp means users must have a Gradle version that embeds a Kotlin version that is compatible with metadata version 2.2 to avoid issues.

In default configurations this is not an issue. Gradle 8.5 introduced a new flag to disable skipping these checks: org.gradle.kotlin.dsl.skipMetadataVersionCheck. When this is set to false these metadata compatibility checks are no longer skipped as they have been in previous versions, and this plugin cannot be used in Gradle versions older than 9.0.0.

Options:

• Bump minimum Gradle version to 9.0 which embeds Kotlin 2.2
• Downgrade okhttp to 4.12
• Use a different library

[Goooler]

Prefer downgrading okhttp to 4.12.

okhttp.module.diff

6c6
<     "version": "4.12.0",
---
>     "version": "5.1.0",
13c13
<       "version": "7.5"
---
>       "version": "8.14.3"
18c18
<       "name": "apiElements",
---
>       "name": "metadataApiElements",
21,26c21,23
<         "org.gradle.dependency.bundling": "external",
<         "org.gradle.jvm.environment": "standard-jvm",
<         "org.gradle.jvm.version": 8,
<         "org.gradle.libraryelements": "jar",
<         "org.gradle.usage": "java-api",
<         "org.jetbrains.kotlin.platform.type": "jvm"
---
>         "org.gradle.jvm.environment": "non-jvm",
>         "org.gradle.usage": "kotlin-metadata",
>         "org.jetbrains.kotlin.platform.type": "common"
29a27,33
>           "group": "org.jetbrains.kotlin",
>           "module": "kotlin-stdlib",
>           "version": {
>             "requires": "2.2.0"
>           }
>         },
>         {
33c37
<             "requires": "3.6.0"
---
>             "requires": "3.15.0"
38c42
<           "module": "kotlin-stdlib-jdk8",
---
>           "module": "kotlin-stdlib",
40c44
<             "requires": "1.8.21"
---
>             "requires": "2.2.0"
46,52c50,56
<           "name": "okhttp-4.12.0.jar",
<           "url": "okhttp-4.12.0.jar",
<           "size": 789531,
<           "sha512": "da63f77c1cae377b40f6fd00cfbbe8177e760e4e622ae2c66860fffd3bbbdf605c8e8e415762e9263445b2289ee834100237c63949f2e01c30b6704315dd8f7b",
<           "sha256": "b1050081b14bb7a3a7e55a4d3ef01b5dcfabc453b4573a4fc019767191d5f4e0",
<           "sha1": "2f4525d4a200e97e1b87449c2cd9bd2e25b7e8cd",
<           "md5": "6acba053af88fed87e710c6c29911d7c"
---
>           "name": "okhttp-metadata-5.1.0.jar",
>           "url": "okhttp-5.1.0.jar",
>           "size": 767,
>           "sha512": "165c65503bded11490b09c46935864aa71ee8b9fc4ea1c01e1cb91b209a64af97e92d5d8fd9b4bc78209a8949a79f37ff49edd992171d25ba6f7e0d968cee87c",
>           "sha256": "e720a383fdc3eb1df4aac77a085e61b7730837364151de867093fdbcafcb44aa",
>           "sha1": "6891a4fd19bcab6f69fe091c2bc6077edec5258e",
>           "md5": "7cefaebda364337f3770168187124f31"
57c61
<       "name": "runtimeElements",
---
>       "name": "metadataSourcesElements",
59c63
<         "org.gradle.category": "library",
---
>         "org.gradle.category": "documentation",
61,65c65,68
<         "org.gradle.jvm.environment": "standard-jvm",
<         "org.gradle.jvm.version": 8,
<         "org.gradle.libraryelements": "jar",
<         "org.gradle.usage": "java-runtime",
<         "org.jetbrains.kotlin.platform.type": "jvm"
---
>         "org.gradle.docstype": "sources",
>         "org.gradle.jvm.environment": "non-jvm",
>         "org.gradle.usage": "kotlin-runtime",
>         "org.jetbrains.kotlin.platform.type": "common"
67,82d69
<       "dependencies": [
<         {
<           "group": "com.squareup.okio",
<           "module": "okio",
<           "version": {
<             "requires": "3.6.0"
<           }
<         },
<         {
<           "group": "org.jetbrains.kotlin",
<           "module": "kotlin-stdlib-jdk8",
<           "version": {
<             "requires": "1.8.21"
<           }
<         }
<       ],
85,91c72,78
<           "name": "okhttp-4.12.0.jar",
<           "url": "okhttp-4.12.0.jar",
<           "size": 789531,
<           "sha512": "da63f77c1cae377b40f6fd00cfbbe8177e760e4e622ae2c66860fffd3bbbdf605c8e8e415762e9263445b2289ee834100237c63949f2e01c30b6704315dd8f7b",
<           "sha256": "b1050081b14bb7a3a7e55a4d3ef01b5dcfabc453b4573a4fc019767191d5f4e0",
<           "sha1": "2f4525d4a200e97e1b87449c2cd9bd2e25b7e8cd",
<           "md5": "6acba053af88fed87e710c6c29911d7c"
---
>           "name": "okhttp-kotlin-5.1.0-sources.jar",
>           "url": "okhttp-5.1.0-sources.jar",
>           "size": 380169,
>           "sha512": "62c15e5dad91c68c2e6c8fc9909e6cc5f3528c97b8e88c421404941d1da86f887414349f7d7e448d32baad85252bbc0b5acbc2c47eb370b685af61245a80bd31",
>           "sha256": "16b1025e2389e538d4e51afeeb422d956dcf54385e40cf029584ce77b87e0f8e",
>           "sha1": "77e418c56edae8a17e141c54c2104fad7f7ad551",
>           "md5": "b6bddabb5d257f3418c2e55056ea7428"
96c83
<       "name": "javadocElements",
---
>       "name": "releaseApiElements-published",
97a85,114
>         "org.gradle.category": "library",
>         "org.gradle.jvm.environment": "android",
>         "org.gradle.usage": "java-api",
>         "org.jetbrains.kotlin.platform.type": "androidJvm"
>       },
>       "available-at": {
>         "url": "../../okhttp-android/5.1.0/okhttp-android-5.1.0.module",
>         "group": "com.squareup.okhttp3",
>         "module": "okhttp-android",
>         "version": "5.1.0"
>       }
>     },
>     {
>       "name": "releaseRuntimeElements-published",
>       "attributes": {
>         "org.gradle.category": "library",
>         "org.gradle.jvm.environment": "android",
>         "org.gradle.usage": "java-runtime",
>         "org.jetbrains.kotlin.platform.type": "androidJvm"
>       },
>       "available-at": {
>         "url": "../../okhttp-android/5.1.0/okhttp-android-5.1.0.module",
>         "group": "com.squareup.okhttp3",
>         "module": "okhttp-android",
>         "version": "5.1.0"
>       }
>     },
>     {
>       "name": "releaseSourcesElements-published",
>       "attributes": {
100,101c117,121
<         "org.gradle.docstype": "javadoc",
<         "org.gradle.usage": "java-runtime"
---
>         "org.gradle.docstype": "sources",
>         "org.gradle.jvm.environment": "android",
>         "org.gradle.libraryelements": "jar",
>         "org.gradle.usage": "java-runtime",
>         "org.jetbrains.kotlin.platform.type": "androidJvm"
103,113c123,128
<       "files": [
<         {
<           "name": "okhttp-4.12.0-javadoc.jar",
<           "url": "okhttp-4.12.0-javadoc.jar",
<           "size": 261,
<           "sha512": "ae93d7ad35d3ba966ce2a5b87f7d2f6b5a08afd9d5ad5b190a957f41c28b229292f24ff1b8823bcedd423bbe0c7d796c3fd660d89b934c7430be17499ea51fa4",
<           "sha256": "a059c7271b66e4c107ab2e2fce42e50ba3ef644eabf843903f95ad99bb5bc4de",
<           "sha1": "8c6816d131791a66e792d7920f4109cfecf917e8",
<           "md5": "d4751629d986c3c8de127d261119efe0"
<         }
<       ]
---
>       "available-at": {
>         "url": "../../okhttp-android/5.1.0/okhttp-android-5.1.0.module",
>         "group": "com.squareup.okhttp3",
>         "module": "okhttp-android",
>         "version": "5.1.0"
>       }
116c131
<       "name": "sourcesElements",
---
>       "name": "jvmApiElements-published",
117a133,164
>         "org.gradle.category": "library",
>         "org.gradle.jvm.environment": "standard-jvm",
>         "org.gradle.libraryelements": "jar",
>         "org.gradle.usage": "java-api",
>         "org.jetbrains.kotlin.platform.type": "jvm"
>       },
>       "available-at": {
>         "url": "../../okhttp-jvm/5.1.0/okhttp-jvm-5.1.0.module",
>         "group": "com.squareup.okhttp3",
>         "module": "okhttp-jvm",
>         "version": "5.1.0"
>       }
>     },
>     {
>       "name": "jvmRuntimeElements-published",
>       "attributes": {
>         "org.gradle.category": "library",
>         "org.gradle.jvm.environment": "standard-jvm",
>         "org.gradle.libraryelements": "jar",
>         "org.gradle.usage": "java-runtime",
>         "org.jetbrains.kotlin.platform.type": "jvm"
>       },
>       "available-at": {
>         "url": "../../okhttp-jvm/5.1.0/okhttp-jvm-5.1.0.module",
>         "group": "com.squareup.okhttp3",
>         "module": "okhttp-jvm",
>         "version": "5.1.0"
>       }
>     },
>     {
>       "name": "jvmSourcesElements-published",
>       "attributes": {
121c168,171
<         "org.gradle.usage": "java-runtime"
---
>         "org.gradle.jvm.environment": "standard-jvm",
>         "org.gradle.libraryelements": "jar",
>         "org.gradle.usage": "java-runtime",
>         "org.jetbrains.kotlin.platform.type": "jvm"
123,133c173,178
<       "files": [
<         {
<           "name": "okhttp-4.12.0-sources.jar",
<           "url": "okhttp-4.12.0-sources.jar",
<           "size": 368316,
<           "sha512": "be32e14a58db30a43ee819d5150a2ca799f3b0b75d5ba271a1f632a5fb085fe35efceb3e1b6935b09e517ae77cf4e222389bf8f7a893400644a2b5b64222ac8a",
<           "sha256": "d91a769a4140e542cddbac4e67fcf279299614e8bfd53bd23b85e60c2861341c",
<           "sha1": "ae6ec072a7ddfd4e225a36de1c185e76ebc7348d",
<           "md5": "5f419dc2ddaf38b3f16ee0257bd51ce2"
<         }
<       ]
---
>       "available-at": {
>         "url": "../../okhttp-jvm/5.1.0/okhttp-jvm-5.1.0.module",
>         "group": "com.squareup.okhttp3",
>         "module": "okhttp-jvm",
>         "version": "5.1.0"
>       }

[Goooler]

Another choice: square/okhttp#9040