Use correct 2025.3 EAP SDK version format

- Change to '253.25908-EAP-CANDIDATE-SNAPSHOT' from JetBrains snapshots repo
- Based on senior engineer feedback and official snapshot repository
- Should resolve IntelliJ Platform dependency resolution

Author: aseemxs

2025.3-support-issue.md

@@ -0,0 +1,112 @@
+# Issue: Adding 2025.3 Support to AWS Toolkit for JetBrains
+
+## Problem Summary
+Unable to resolve IntelliJ Platform dependencies when adding 2025.3 EAP support to the AWS Toolkit. Build fails with "No IntelliJ Platform dependency found" errors.
+
+## Background
+- **Goal**: Add JetBrains 2025.3 EAP support to AWS Toolkit
+- **Branch**: `add-2025-3-support` 
+- **Key Change**: JetBrains discontinued IC (Community Edition) for 2025.3, moved to unified platform
+
+## Error Evolution
+1. **Initial**: `No IntelliJ Platform dependency found with 'IC-2025.3 (non-installer)'`
+2. **After IdeFlavor changes**: `No IntelliJ Platform dependency found with 'IU-2025.3 (non-installer)'`
+3. **After EAP format**: `No IntelliJ Platform dependency found with 'IU-2025.3-EAP-SNAPSHOT (non-installer)'`
+4. **Current**: `No IntelliJ Platform dependency found with 'IU-253.25908.13 (non-installer)'`
+
+## What We've Tried
+
+### 1. SDK Version Formats
+- ✅ `"2025.3"` → ❌ Doesn't exist for IC
+- ✅ `"253.25908.29"` → ❌ Complex build number approach
+- ✅ `"2025.3-EAP-SNAPSHOT"` → ❌ EAP snapshot format
+- ✅ `"253.25908.13"` → ❌ Specific IU build number
+
+### 2. IdeFlavor Changes
+- ✅ Changed all `IdeFlavor.IC` → `IdeFlavor.IU` in:
+  - `plugins/core/jetbrains-community/build.gradle.kts`
+  - `plugins/amazonq/*/jetbrains-community/build.gradle.kts` (4 modules)
+  - `plugins/toolkit/jetbrains-core/build.gradle.kts`
+  - `buildSrc/src/main/kotlin/toolkit-intellij-plugin.gradle.kts` (default fallback)
+
+### 3. Verification Steps
+- ✅ Confirmed `253.25908.13` exists in JetBrains EAP releases for IU
+- ✅ Updated marketplace plugin versions to matching build numbers
+- ✅ Rider kept as `2025.3-SNAPSHOT` (works fine)
+
+## Senior Engineer Feedback ✅
+
+### 1. SDK Version Solution
+**Correct format**: `253.25908-EAP-CANDIDATE-SNAPSHOT`
+- **Source**: https://www.jetbrains.com/intellij-repository/snapshots
+- **Issue**: We were using `253.25908.13` instead of the snapshot format
+
+### 2. IdeFlavor Strategy 
+**Need version-conditional logic**:
+```kotlin
+// For community builds, use version-based logic:
+when (version) {
+    older_versions -> IdeFlavor.IC  // Keep IC for older versions
+    "2025.3"+ -> IdeFlavor.IU       // Use IU for 2025.3+
+}
+```
+
+### 3. Platform Coordinates (Advanced)
+**Alternative approach using Maven coordinates**:
+```kotlin
+// Instead of IdeFlavor, could use direct coordinates:
+IntellijIdeaUltimate(
+    code = "IU",
+    maven = Coordinates("com.jetbrains.intellij.idea", "ideaIU"),
+    installer = Coordinates("idea", "ideaIU"),
+),
+IntellijIdea(
+    code = "IU", 
+    maven = Coordinates("com.jetbrains.intellij.idea", "idea"),
+    installer = Coordinates("idea", "idea"),
+)
+```
+**Translation**: This bypasses IdeFlavor and directly specifies Maven artifact coordinates
+
+## Updated Configuration Needed
+```kotlin
+// IdeVersions.kt - CORRECTED
+Profile(
+    name = "2025.3",
+    gateway = ProductProfile(sdkVersion = "253.25908-EAP-CANDIDATE-SNAPSHOT", ...),
+    community = ProductProfile(sdkVersion = "253.25908-EAP-CANDIDATE-SNAPSHOT", ...),
+    ultimate = ProductProfile(sdkVersion = "253.25908-EAP-CANDIDATE-SNAPSHOT", ...),
+    rider = RiderProfile(sdkVersion = "2025.3-SNAPSHOT", ...)
+)
+
+// Version-conditional IdeFlavor logic needed:
+intellijToolkit {
+    ideFlavor.set(
+        if (version >= "2025.3") IdeFlavor.IU 
+        else IdeFlavor.IC
+    )
+}
+```
+
+## Remaining Questions
+
+1. **Version Detection**: How to detect current IDE version in build script for conditional logic?
+2. **Maven Coordinates**: Should we implement the direct coordinates approach instead of IdeFlavor?
+3. **Backward Compatibility**: How to ensure older versions (2024.x) still work with IC?
+
+## Repository State
+- **Fork**: `https://github.com/aseemxs/aws-toolkit-jetbrains.git`
+- **Branch**: `add-2025-3-support`
+- **Commits**: 7 commits attempting various fixes
+- **Status**: All changes pushed, ready for review
+
+## References
+- [JetBrains Platform Gradle Plugin Docs](https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-dependencies-extension.html)
+- [IntelliJ Platform Gradle Plugin 2.0 Blog](https://blog.jetbrains.com/platform/2024/07/intellij-platform-gradle-plugin-2-0/)
+- [IC Deprecation Discussion](https://platform.jetbrains.com/t/intellij-platform-gradle-plugins-intellijideacommunity-deprecation/2709)
+
+## Next Steps Needed
+Senior engineer guidance on:
+1. Correct dependency resolution approach for 2025.3 EAP
+2. Whether our IdeFlavor mapping strategy is correct
+3. Any missing configuration or repository setup

buildSrc/src/main/kotlin/software/aws/toolkits/gradle/intellij/IdeVersions.kt

@@ -156,11 +156,11 @@ object IdeVersions {
         Profile(
             name = "2025.3",
             gateway = ProductProfile(
-                sdkVersion = "253.25908.13",
+                sdkVersion = "253.25908-EAP-CANDIDATE-SNAPSHOT",
                 bundledPlugins = listOf("org.jetbrains.plugins.terminal")
             ),
             community = ProductProfile(
-                sdkVersion = "253.25908.13",
+                sdkVersion = "253.25908-EAP-CANDIDATE-SNAPSHOT",
                 bundledPlugins = commonPlugins + listOf(
                     "com.intellij.java",
                     "com.intellij.gradle",
@@ -176,7 +176,7 @@ object IdeVersions {
                 )
             ),
             ultimate = ProductProfile(
-                sdkVersion = "253.25908.13",
+                sdkVersion = "253.25908-EAP-CANDIDATE-SNAPSHOT",
                 bundledPlugins = commonPlugins + listOf(
                     "JavaScript",
                     "JavaScriptDebugger",