Fix CodeWhisperer compilation for 2025.3

- Change lsp4j dependency from implementation to api in shared module to expose transitively
- Add lsp4j dependency to codewhisperer module
- Add null checks for editor.virtualFile in CodeWhispererService and CodeWhispererServiceNew
- Fixes 'Unresolved reference lsp4j' and null-safety errors

Author: aseemxs

plugins/amazonq/codewhisperer/jetbrains-community/build.gradle.kts

@@ -19,6 +19,7 @@ dependencies {
     compileOnly(project(":plugin-core:jetbrains-community"))
 
     implementation(project(":plugin-amazonq:shared:jetbrains-community"))
+    implementation(libs.lsp4j)
     // CodeWhispererTelemetryService uses a CircularFifoQueue, previously transitive from zjsonpatch
     implementation(libs.commons.collections)
 

plugins/amazonq/codewhisperer/jetbrains-community/src/software/aws/toolkits/jetbrains/services/codewhisperer/service/CodeWhispererService.kt

@@ -542,7 +542,7 @@ class CodeWhispererService(private val cs: CoroutineScope) : Disposable {
                         .openFiles.mapNotNull { toUriString(it) }
                 }.orEmpty(),
             ).apply {
-                textDocument = TextDocumentIdentifier(toUriString(editor.virtualFile))
+                textDocument = TextDocumentIdentifier(toUriString(editor.virtualFile ?: return@compute null))
                 position = Position(
                     editor.caretModel.primaryCaret.logicalPosition.line,
                     editor.caretModel.primaryCaret.logicalPosition.column

plugins/amazonq/codewhisperer/jetbrains-community/src/software/aws/toolkits/jetbrains/services/codewhisperer/service/CodeWhispererServiceNew.kt

@@ -572,7 +572,7 @@ class CodeWhispererServiceNew(private val cs: CoroutineScope) : Disposable {
                 documentChangeParams = null,
                 openTabFilepaths = null,
             ).apply {
-                textDocument = TextDocumentIdentifier(toUriString(editor.virtualFile))
+                textDocument = TextDocumentIdentifier(toUriString(editor.virtualFile ?: return@compute null))
                 position = Position(
                     editor.caretModel.primaryCaret.logicalPosition.line,
                     editor.caretModel.primaryCaret.logicalPosition.column

plugins/amazonq/shared/jetbrains-community/build.gradle.kts

@@ -23,7 +23,7 @@ dependencies {
     // CodeWhispererTelemetryService uses a CircularFifoQueue
     implementation(libs.commons.collections)
     implementation(libs.nimbus.jose.jwt)
-    implementation(libs.lsp4j)
+    api(libs.lsp4j)
 
     testFixturesApi(testFixtures(project(":plugin-core:jetbrains-community")))
 }