[java] [Spring] useJspecify for java clients and spring generator by jpfinne · Pull Request #23256 · OpenAPITools/openapi-generator

jpfinne · 2026-03-15T12:08:23Z

Add JSpecify in Spring and multiple java generators.

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java:
@cachescrubber (2022/02) @welshm (2022/02) @MelleD (2022/02) @atextor (2022/02) @manedev79 (2022/02) @javisst (2022/02) @borsch (2022/02) @banlevente (2022/02) @Zomzog (2022/09) @martin-mfg (2023/08)

Spring:
@bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @martin-mfg (2023/08)

Summary by cubic

Adds useJspecify to Java clients (native, restclient, resttemplate, webclient) and Spring (Boot/Cloud/HTTP interface) to opt into JSpecify nullness. Generated code defaults to non-null with @org.jspecify.annotations.NullMarked and uses @org.jspecify.annotations.Nullable where needed; adds config presets and samples to showcase usage with Jackson 3 and Spring Boot 4.

New Features
- New useJspecify option for Java clients and Spring; generates package-info.java with @org.jspecify.annotations.NullMarked in api/invoker/model packages and maps Nullable to org.jspecify.annotations.Nullable (e.g., Spring NativeWebRequest field and constructor param).
- Updated templates with JSpecify-aware lambdas to adjust types and suppress @Nonnull under @NullMarked; validated supported client libraries; refreshed generator docs for Java and Spring.
- Added bin/configs/*-jspecify.yaml and generated sample projects for each supported Java client and Spring Boot to demonstrate useJspecify.
Dependencies
- When useJspecify: true, generated POMs include org.jspecify:jspecify:1.0.0 across Java client libraries and Spring libraries.

^{Written for commit cca147d. Summary will update on new commits.}

…into feature/jspecify

…specify

cubic-dev-ai

12 issues found across 211 files

Note: This PR contains a large number of files. cubic only reviews up to 75 files per PR, so some files may not have been reviewed.

Prompt for AI agents (unresolved issues)


Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/README.md">

<violation number="1" location="samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/README.md:96">
P1: The generated README example uses `new java.time.Instant()` which is invalid Java code that will not compile. `java.time.Instant` has private constructors and can only be instantiated via factory methods like `Instant.now()` or `Instant.parse()`. This makes the "Getting Started" example uncompilable for users who copy it.</violation>

<violation number="2" location="samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/README.md:102">
P1: The README example catches `HttpStatusCodeException` without importing it. The generated API code throws `RestClientResponseException`, but the README example uses a different exception type that isn't imported. This will cause a compilation error when developers try to use the example code.</violation>
</file>

<file name="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/model/AbstractOpenApiSchema.java">

<violation number="1" location="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/model/AbstractOpenApiSchema.java:114">
P2: Method's Object parameter should be annotated @Nullable to correctly advertise that null is accepted (as confirmed by the null check in the body).</violation>
</file>

<file name="samples/client/petstore/java/native-jackson3-jspecify/git_push.sh">

<violation number="1" location="samples/client/petstore/java/native-jackson3-jspecify/git_push.sh:53">
P2: The script hardcodes `master` branch which breaks for repositories with `main` or other default branch names</violation>
</file>

<file name="samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/.travis.yml">

<violation number="1" location="samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/.travis.yml:12">
P1: Travis CI JDK matrix is incompatible with Spring Boot 4 sample - configured JDKs (8-12) are below the Java 17 minimum requirement</violation>
</file>

<file name="samples/client/petstore/java/native-jackson3-jspecify/README.md">

<violation number="1" location="samples/client/petstore/java/native-jackson3-jspecify/README.md:88">
P2: Generated README uses invalid `Instant` construction. The sample code uses `new java.time.Instant()` which fails to compile because `java.time.Instant` is an immutable value type with no public constructors. Use factory methods like `Instant.now()` or `Instant.parse(...)` instead.</violation>
</file>

<file name="samples/client/petstore/java/native-jackson3-jspecify/pom.xml">

<violation number="1" location="samples/client/petstore/java/native-jackson3-jspecify/pom.xml:5">
P1: Maven coordinates collide with existing non-JSpecify sample. Both samples use identical groupId/artifactId/version (org.openapitools:petstore-native-jackson3:1.0.0), causing artifact collisions when both are installed to the local Maven repository.</violation>
</file>

<file name="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/RFC3339InstantDeserializer.java">

<violation number="1" location="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/RFC3339InstantDeserializer.java:32">
P1: Custom parsing lost during Jackson contextualization - subclass must override withDateFormat/withLeniency/withShape to preserve RFC3339 space-handling behavior</violation>
</file>

<file name="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/Configuration.java">

<violation number="1" location="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/Configuration.java:57">
P2: Changing the `ApiClient` factory after the default client has been initialized has no effect because the cached singleton is never cleared. The `setApiClientFactory` method should invalidate the cached `defaultApiClient` or the factory change will be silently ignored once the client is lazily initialized.</violation>
</file>

<file name="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/model/Foo.java">

<violation number="1" location="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/model/Foo.java:76">
P1: Required property `requiredDt` is exposed as non-null (no @Nullable annotation under @NullMarked package) but can be left null by the generated no-arg constructor and builder's build() method without validation. This creates a JSpecify contract violation where callers trusting the non-null type may encounter NPE when dereferencing getRequiredDt(). The toUrlQueryString() method's null check for getRequiredDt() confirms this is a known gap in the code generation.</violation>
</file>

<file name="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/api/DefaultApi.java">

<violation number="1" location="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/api/DefaultApi.java:274">
P1: The `dtCookie` parameter is defined in the OpenAPI spec and exposed in the API method signatures, but it is never added to the HTTP request. The request builder accepts the parameter but ignores it instead of adding it as a Cookie header.</violation>

<violation number="2" location="samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/api/DefaultApi.java:401">
P1: Optional file parameter `_file` marked as `@Nullable` is passed unconditionally to `addBinaryBody()` without null checking. This will cause a runtime exception when null is passed, violating the advertised nullable contract. The fix should wrap the `addBinaryBody()` call with a null check: `if (_file != null) { multiPartBuilder.addBinaryBody("file", _file); hasFiles = true; }`</violation>
</file>

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cubic-dev-ai · 2026-03-15T18:11:38Z

samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/README.md

+        try {
+            Foo result = apiInstance.fooDtParamGet(dtParam, dtQuery, dtCookie);
+            System.out.println(result);
+        } catch (HttpStatusCodeException e) {


P1: The README example catches HttpStatusCodeException without importing it. The generated API code throws RestClientResponseException, but the README example uses a different exception type that isn't imported. This will cause a compilation error when developers try to use the example code.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/README.md, line 102: <comment>The README example catches `HttpStatusCodeException` without importing it. The generated API code throws `RestClientResponseException`, but the README example uses a different exception type that isn't imported. This will cause a compilation error when developers try to use the example code.</comment> <file context> @@ -0,0 +1,142 @@ + try { + Foo result = apiInstance.fooDtParamGet(dtParam, dtQuery, dtCookie); + System.out.println(result); + } catch (HttpStatusCodeException e) { + System.err.println("Exception when calling DefaultApi#fooDtParamGet"); + System.err.println("Status code: " + e.getStatusCode().value()); </file context>

cubic-dev-ai · 2026-03-15T18:11:39Z

samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/README.md

+        defaultClient.setBasePath("http://localhost");
+
+        DefaultApi apiInstance = new DefaultApi(defaultClient);
+        java.time.Instant dtParam = new java.time.Instant(); // java.time.Instant | 


P1: The generated README example uses new java.time.Instant() which is invalid Java code that will not compile. java.time.Instant has private constructors and can only be instantiated via factory methods like Instant.now() or Instant.parse(). This makes the "Getting Started" example uncompilable for users who copy it.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/README.md, line 96: <comment>The generated README example uses `new java.time.Instant()` which is invalid Java code that will not compile. `java.time.Instant` has private constructors and can only be instantiated via factory methods like `Instant.now()` or `Instant.parse()`. This makes the "Getting Started" example uncompilable for users who copy it.</comment> <file context> @@ -0,0 +1,142 @@ + defaultClient.setBasePath("http://localhost"); + + DefaultApi apiInstance = new DefaultApi(defaultClient); + java.time.Instant dtParam = new java.time.Instant(); // java.time.Instant | + java.time.Instant dtQuery = new java.time.Instant(); // java.time.Instant | + java.time.Instant dtCookie = new java.time.Instant(); // java.time.Instant | </file context>

Suggested change

java.time.Instant dtParam = new java.time.Instant(); // java.time.Instant |

+ java.time.Instant dtParam = java.time.Instant.now(); // java.time.Instant |

cubic-dev-ai · 2026-03-15T18:11:39Z

samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/.travis.yml

+  - openjdk11
+  - openjdk10
+  - openjdk9
+  - openjdk8


P1: Travis CI JDK matrix is incompatible with Spring Boot 4 sample - configured JDKs (8-12) are below the Java 17 minimum requirement

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify/.travis.yml, line 12: <comment>Travis CI JDK matrix is incompatible with Spring Boot 4 sample - configured JDKs (8-12) are below the Java 17 minimum requirement</comment> <file context> @@ -0,0 +1,22 @@ + - openjdk11 + - openjdk10 + - openjdk9 + - openjdk8 +before_install: + # ensure gradlew has proper permission </file context>

cubic-dev-ai · 2026-03-15T18:11:39Z

samples/client/petstore/java/native-jackson3-jspecify/pom.xml

+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>org.openapitools</groupId>
+    <artifactId>petstore-native-jackson3</artifactId>


P1: Maven coordinates collide with existing non-JSpecify sample. Both samples use identical groupId/artifactId/version (org.openapitools:petstore-native-jackson3:1.0.0), causing artifact collisions when both are installed to the local Maven repository.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/native-jackson3-jspecify/pom.xml, line 5: <comment>Maven coordinates collide with existing non-JSpecify sample. Both samples use identical groupId/artifactId/version (org.openapitools:petstore-native-jackson3:1.0.0), causing artifact collisions when both are installed to the local Maven repository.</comment> <file context> @@ -0,0 +1,268 @@ + xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> + <modelVersion>4.0.0</modelVersion> + <groupId>org.openapitools</groupId> + <artifactId>petstore-native-jackson3</artifactId> + <packaging>jar</packaging> + <name>petstore-native-jackson3</name> </file context>

Suggested change

<artifactId>petstore-native-jackson3</artifactId>

<artifactId>petstore-native-jackson3-jspecify</artifactId>

cubic-dev-ai · 2026-03-15T18:11:39Z

...tive-jackson3-jspecify/src/main/java/org/openapitools/client/RFC3339InstantDeserializer.java

+import tools.jackson.databind.ext.javatime.deser.InstantDeserializer;
+
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.21.0-SNAPSHOT")
+public class RFC3339InstantDeserializer<T extends Temporal> extends InstantDeserializer<T> {


P1: Custom parsing lost during Jackson contextualization - subclass must override withDateFormat/withLeniency/withShape to preserve RFC3339 space-handling behavior

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/RFC3339InstantDeserializer.java, line 32: <comment>Custom parsing lost during Jackson contextualization - subclass must override withDateFormat/withLeniency/withShape to preserve RFC3339 space-handling behavior</comment> <file context> @@ -0,0 +1,100 @@ +import tools.jackson.databind.ext.javatime.deser.InstantDeserializer; + +@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.21.0-SNAPSHOT") +public class RFC3339InstantDeserializer<T extends Temporal> extends InstantDeserializer<T> { + private static final long serialVersionUID = 1L; + private final static boolean DEFAULT_NORMALIZE_ZONE_ID = DateTimeFeature.NORMALIZE_DESERIALIZED_ZONE_ID.enabledByDefault(); </file context>

cubic-dev-ai · 2026-03-15T18:11:39Z

...tore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/api/DefaultApi.java

+    }
+  }
+
+  private HttpRequest.Builder fooDtParamGetRequestBuilder( java.time.@Nullable Instant dtParam,  java.time.@Nullable Instant dtQuery,  java.time.@Nullable Instant dtCookie, Map<String, String> headers) throws ApiException {


P1: The dtCookie parameter is defined in the OpenAPI spec and exposed in the API method signatures, but it is never added to the HTTP request. The request builder accepts the parameter but ignores it instead of adding it as a Cookie header.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/api/DefaultApi.java, line 274: <comment>The `dtCookie` parameter is defined in the OpenAPI spec and exposed in the API method signatures, but it is never added to the HTTP request. The request builder accepts the parameter but ignores it instead of adding it as a Cookie header.</comment> <file context> @@ -0,0 +1,445 @@ + } + } + + private HttpRequest.Builder fooDtParamGetRequestBuilder( java.time.@Nullable Instant dtParam, java.time.@Nullable Instant dtQuery, java.time.@Nullable Instant dtCookie, Map<String, String> headers) throws ApiException { + + HttpRequest.Builder localVarRequestBuilder = HttpRequest.newBuilder(); </file context>

cubic-dev-ai · 2026-03-15T18:11:39Z

...ive-jackson3-jspecify/src/main/java/org/openapitools/client/model/AbstractOpenApiSchema.java

+        return o.toString().replace("\n", "\n    ");
+    }
+
+    public boolean equals(Object o) {


P2: Method's Object parameter should be annotated @nullable to correctly advertise that null is accepted (as confirmed by the null check in the body).

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/model/AbstractOpenApiSchema.java, line 114: <comment>Method's Object parameter should be annotated @Nullable to correctly advertise that null is accepted (as confirmed by the null check in the body).</comment> <file context> @@ -0,0 +1,147 @@ + return o.toString().replace("\n", "\n "); + } + + public boolean equals(Object o) { + if (this == o) { + return true; </file context>

Suggested change

public boolean equals(Object o) {

public boolean equals(@Nullable Object o) {

cubic-dev-ai · 2026-03-15T18:11:39Z

samples/client/petstore/java/native-jackson3-jspecify/git_push.sh

+
+fi
+
+git pull origin master


P2: The script hardcodes master branch which breaks for repositories with main or other default branch names

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/native-jackson3-jspecify/git_push.sh, line 53: <comment>The script hardcodes `master` branch which breaks for repositories with `main` or other default branch names</comment> <file context> @@ -0,0 +1,57 @@ + +fi + +git pull origin master + +# Pushes (Forces) the changes in the local repository up to the remote repository </file context>

cubic-dev-ai · 2026-03-15T18:11:39Z

samples/client/petstore/java/native-jackson3-jspecify/README.md

+        // Configure clients using the `defaultClient` object, such as
+        // overriding the host and port, timeout, etc.
+        DefaultApi apiInstance = new DefaultApi(defaultClient);
+        java.time.Instant dtParam = new java.time.Instant(); // java.time.Instant | 


P2: Generated README uses invalid Instant construction. The sample code uses new java.time.Instant() which fails to compile because java.time.Instant is an immutable value type with no public constructors. Use factory methods like Instant.now() or Instant.parse(...) instead.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/native-jackson3-jspecify/README.md, line 88: <comment>Generated README uses invalid `Instant` construction. The sample code uses `new java.time.Instant()` which fails to compile because `java.time.Instant` is an immutable value type with no public constructors. Use factory methods like `Instant.now()` or `Instant.parse(...)` instead.</comment> <file context> @@ -0,0 +1,137 @@ + // Configure clients using the `defaultClient` object, such as + // overriding the host and port, timeout, etc. + DefaultApi apiInstance = new DefaultApi(defaultClient); + java.time.Instant dtParam = new java.time.Instant(); // java.time.Instant | + java.time.Instant dtQuery = new java.time.Instant(); // java.time.Instant | + java.time.Instant dtCookie = new java.time.Instant(); // java.time.Instant | </file context>

Suggested change

java.time.Instant dtParam = new java.time.Instant(); // java.time.Instant |

java.time.Instant dtParam = java.time.Instant.now(); // java.time.Instant |

cubic-dev-ai · 2026-03-15T18:11:39Z

...store/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/Configuration.java

+  /**
+   * set the callback used to create new ApiClient objects
+   */
+  public static void setApiClientFactory(Supplier<ApiClient> factory) {


P2: Changing the ApiClient factory after the default client has been initialized has no effect because the cached singleton is never cleared. The setApiClientFactory method should invalidate the cached defaultApiClient or the factory change will be silently ignored once the client is lazily initialized.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/java/native-jackson3-jspecify/src/main/java/org/openapitools/client/Configuration.java, line 57: <comment>Changing the `ApiClient` factory after the default client has been initialized has no effect because the cached singleton is never cleared. The `setApiClientFactory` method should invalidate the cached `defaultApiClient` or the factory change will be silently ignored once the client is lazily initialized.</comment> <file context> @@ -0,0 +1,63 @@ + /** + * set the callback used to create new ApiClient objects + */ + public static void setApiClientFactory(Supplier<ApiClient> factory) { + apiClientFactory = Objects.requireNonNull(factory); + } </file context>

Chrimle · 2026-03-15T18:14:06Z

.../openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

+
+    protected void applyJspecify() {
+        writePropertyBack("nullableAnnotation", "@org.jspecify.annotations.Nullable");
+        writePropertyBack("nonNullAnnotation", "@NonNull");


no need for fully-qualified name?

Chrimle · 2026-03-15T18:14:40Z

.../openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

+                        jSpecifyNullableLambda.keptNullable = false;
+                        int idx = dataType.lastIndexOf('.');
+                        if (idx > 0) {
+                            // generate declareation like java.time.@Nullable Timestamp


Suggested change

// generate declareation like java.time.@Nullable Timestamp

// generate declaration like java.time.@Nullable Timestamp

Chrimle · 2026-03-15T18:17:34Z

...es/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java

+        super.applyJspecify();
+        addPackagInfoSupportingFiles();
+        importMapping.put("Nullable", "org.jspecify.annotations.Nullable");
+        jSpecifyNullableLambda.setNullableAnnotation("@" + additionalProperties.get(JAVAX_PACKAGE) + ".annotation.Nullable");


Not sure if I understand why javax/jakarta should be used here? Because I did not see that we set this JAVAX_PACKAGE to be jspecify... but maybe I missed something

Chrimle · 2026-03-15T18:18:08Z

.../openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

+        writePropertyBack("nonNullAnnotation", "@jakarta.annotation.Nonnull");
+    }
+
+    protected void applyJspecify() {


no need to set the JAVAX_PACKAGE to jspecify?

jpfinne and others added 4 commits March 15, 2026 13:06

useJspecify for java clients and spring generator

7bd73f8

Merge master

603af01

Merge branch 'master' of https://github.com/jpfinne/openapi-generator …

7521f10

…into feature/jspecify

Merge branch 'master' into feature/jspecify

1cee79c

jpfinne mentioned this pull request Mar 15, 2026

Add support for JSpecify annotations in SpringCodegen #23233

Open

6 tasks

jpfinne added 5 commits March 15, 2026 13:34

Merge remote-tracking branch 'origin/feature/jspecify' into feature/j…

9af4802

…specify

Regenerate documentation

4aae7ce

Remove ignore file

8023714

Doc only for JavaClientCodegen and SpringCodeGen

7c4b50b

Regenerate

cca147d

jpfinne marked this pull request as ready for review March 15, 2026 17:50

jpfinne changed the title ~~useJspecify for java clients and spring generator~~ [java] [Spring] useJspecify for java clients and spring generator Mar 15, 2026

cubic-dev-ai bot reviewed Mar 15, 2026

View reviewed changes

Chrimle suggested changes Mar 15, 2026

View reviewed changes

	java.time.Instant dtParam = new java.time.Instant(); // java.time.Instant \|
	+ java.time.Instant dtParam = java.time.Instant.now(); // java.time.Instant \|

	<artifactId>petstore-native-jackson3</artifactId>
	<artifactId>petstore-native-jackson3-jspecify</artifactId>

	public boolean equals(Object o) {
	public boolean equals(@Nullable Object o) {

	java.time.Instant dtParam = new java.time.Instant(); // java.time.Instant \|
	java.time.Instant dtParam = java.time.Instant.now(); // java.time.Instant \|

	// generate declareation like java.time.@Nullable Timestamp
	// generate declaration like java.time.@Nullable Timestamp

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jpfinne commented Mar 15, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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cubic-dev-ai bot Mar 15, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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