diff --git a/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt b/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt
index 7ddfee6cec8..ccb8de8072c 100644
--- a/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt
+++ b/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt
@@ -1263,13 +1263,6 @@ object DIAGNOSTICS_LIST : DiagnosticList("FirErrors") {
         val MODIFIER_FORM_FOR_NON_BUILT_IN_SUSPEND by error<PsiElement>(PositioningStrategy.REFERENCED_NAME_BY_QUALIFIED)
         val RETURN_FOR_BUILT_IN_SUSPEND by error<KtReturnExpression>()
     }
-
-    val JVM by object : DiagnosticGroup("jvm") {
-        val JAVA_TYPE_MISMATCH by error<KtExpression> {
-            parameter<ConeKotlinType>("expectedType")
-            parameter<ConeKotlinType>("actualType")
-        }
-    }
 }
 
 private val exposedVisibilityDiagnosticInit: DiagnosticBuilder.() -> Unit = {
diff --git a/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirJvmDiagnosticsList.kt b/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirJvmDiagnosticsList.kt
index 7677263e36c..b67c0f37616 100644
--- a/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirJvmDiagnosticsList.kt
+++ b/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirJvmDiagnosticsList.kt
@@ -7,7 +7,9 @@ package org.jetbrains.kotlin.fir.checkers.generator.diagnostics
 
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.fir.PrivateForInline
-import org.jetbrains.kotlin.fir.checkers.generator.diagnostics.model.*
+import org.jetbrains.kotlin.fir.checkers.generator.diagnostics.model.DiagnosticList
+import org.jetbrains.kotlin.fir.types.ConeKotlinType
+import org.jetbrains.kotlin.psi.KtExpression
 
 @Suppress("UNUSED_VARIABLE", "LocalVariableName", "ClassName", "unused")
 @OptIn(PrivateForInline::class)
@@ -15,4 +17,11 @@ object JVM_DIAGNOSTICS_LIST : DiagnosticList("FirJvmErrors") {
     val DECLARATIONS by object : DiagnosticGroup("Declarations") {
         val CONFLICTING_JVM_DECLARATIONS by error<PsiElement>()
     }
+
+    val TYPES by object : DiagnosticGroup("Types") {
+        val JAVA_TYPE_MISMATCH by error<KtExpression> {
+            parameter<ConeKotlinType>("expectedType")
+            parameter<ConeKotlinType>("actualType")
+        }
+    }
 }
diff --git a/compiler/fir/checkers/checkers.jvm/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/jvm/FirJvmErrors.kt b/compiler/fir/checkers/checkers.jvm/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/jvm/FirJvmErrors.kt
index 5ad640b044d..bee4bf3b72e 100644
--- a/compiler/fir/checkers/checkers.jvm/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/jvm/FirJvmErrors.kt
+++ b/compiler/fir/checkers/checkers.jvm/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/jvm/FirJvmErrors.kt
@@ -7,6 +7,8 @@ package org.jetbrains.kotlin.fir.analysis.diagnostics.jvm
 
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.fir.analysis.diagnostics.*
+import org.jetbrains.kotlin.fir.types.ConeKotlinType
+import org.jetbrains.kotlin.psi.KtExpression
 
 /*
  * This file was generated automatically
@@ -17,4 +19,7 @@ object FirJvmErrors {
     // Declarations
     val CONFLICTING_JVM_DECLARATIONS by error0<PsiElement>()
 
+    // Types
+    val JAVA_TYPE_MISMATCH by error2<KtExpression, ConeKotlinType, ConeKotlinType>()
+
 }
diff --git a/compiler/fir/checkers/checkers.jvm/src/org/jetbrains/kotlin/fir/analysis/jvm/checkers/expression/FirJavaGenericVarianceViolationTypeChecker.kt b/compiler/fir/checkers/checkers.jvm/src/org/jetbrains/kotlin/fir/analysis/jvm/checkers/expression/FirJavaGenericVarianceViolationTypeChecker.kt
index a732cbd3f26..aae8db44e22 100644
--- a/compiler/fir/checkers/checkers.jvm/src/org/jetbrains/kotlin/fir/analysis/jvm/checkers/expression/FirJavaGenericVarianceViolationTypeChecker.kt
+++ b/compiler/fir/checkers/checkers.jvm/src/org/jetbrains/kotlin/fir/analysis/jvm/checkers/expression/FirJavaGenericVarianceViolationTypeChecker.kt
@@ -9,7 +9,7 @@ import org.jetbrains.kotlin.fir.PrimitiveTypes
 import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
 import org.jetbrains.kotlin.fir.analysis.checkers.expression.FirFunctionCallChecker
 import org.jetbrains.kotlin.fir.analysis.diagnostics.DiagnosticReporter
-import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
+import org.jetbrains.kotlin.fir.analysis.diagnostics.jvm.FirJvmErrors
 import org.jetbrains.kotlin.fir.analysis.diagnostics.reportOn
 import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
 import org.jetbrains.kotlin.fir.expressions.FirFunctionCall
@@ -122,7 +122,7 @@ object FirJavaGenericVarianceViolationTypeChecker : FirFunctionCallChecker() {
                     lowerBoundWithoutCapturing.withNullability(ConeNullability.NULLABLE, typeCtx)
                 )
             ) {
-                reporter.reportOn(arg.source, FirErrors.JAVA_TYPE_MISMATCH, expectedType, argType, context)
+                reporter.reportOn(arg.source, FirJvmErrors.JAVA_TYPE_MISMATCH, expectedType, argType, context)
             }
         }
     }
diff --git a/compiler/fir/checkers/checkers.jvm/src/org/jetbrains/kotlin/fir/analysis/jvm/diagnostics/FirJvmDefaultErrorMessages.kt b/compiler/fir/checkers/checkers.jvm/src/org/jetbrains/kotlin/fir/analysis/jvm/diagnostics/FirJvmDefaultErrorMessages.kt
new file mode 100644
index 00000000000..07be961954a
--- /dev/null
+++ b/compiler/fir/checkers/checkers.jvm/src/org/jetbrains/kotlin/fir/analysis/jvm/diagnostics/FirJvmDefaultErrorMessages.kt
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir.analysis.jvm.diagnostics
+
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirDefaultErrorMessages
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirDiagnosticRenderers.RENDER_TYPE
+import org.jetbrains.kotlin.fir.analysis.diagnostics.jvm.FirJvmErrors.CONFLICTING_JVM_DECLARATIONS
+import org.jetbrains.kotlin.fir.analysis.diagnostics.jvm.FirJvmErrors.JAVA_TYPE_MISMATCH
+
+object FirJvmDefaultErrorMessages {
+    fun installJvmErrorMessages() {
+        FirDefaultErrorMessages.Companion.MAP.also { map ->
+            map.put(CONFLICTING_JVM_DECLARATIONS, "Platform declaration clash")
+            map.put(JAVA_TYPE_MISMATCH, "Java type mismatch expected {0} but found {1}. Use explicit cast", RENDER_TYPE, RENDER_TYPE)
+        }
+    }
+}
\ No newline at end of file
diff --git a/compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt b/compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt
index f98113eca18..94acd83b012 100644
--- a/compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt
+++ b/compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt
@@ -648,7 +648,4 @@ object FirErrors {
     val MODIFIER_FORM_FOR_NON_BUILT_IN_SUSPEND by error0<PsiElement>(SourceElementPositioningStrategies.REFERENCED_NAME_BY_QUALIFIED)
     val RETURN_FOR_BUILT_IN_SUSPEND by error0<KtReturnExpression>()
 
-    // jvm
-    val JAVA_TYPE_MISMATCH by error2<KtExpression, ConeKotlinType, ConeKotlinType>()
-
 }
diff --git a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDefaultErrorMessages.kt b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDefaultErrorMessages.kt
index e2f5617847e..89c6d973c5a 100644
--- a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDefaultErrorMessages.kt
+++ b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDefaultErrorMessages.kt
@@ -247,7 +247,6 @@ import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.INVALID_TYPE_OF_A
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.INVISIBLE_REFERENCE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.IS_ENUM_ENTRY
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.ITERATOR_AMBIGUITY
-import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.JAVA_TYPE_MISMATCH
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.KCLASS_WITH_NULLABLE_TYPE_PARAMETER_IN_SIGNATURE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.LEAKED_IN_PLACE_LAMBDA
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.LOCAL_ANNOTATION_CLASS_ERROR
@@ -1606,9 +1605,6 @@ class FirDefaultErrorMessages {
             )
             map.put(RETURN_FOR_BUILT_IN_SUSPEND, "Using implicit label for this lambda is prohibited")
 
-            // JVM
-            map.put(JAVA_TYPE_MISMATCH, "Java type mismatch expected {0} but found {1}. Use explicit cast", RENDER_TYPE, RENDER_TYPE)
-
             // Extended checkers group
             map.put(REDUNDANT_VISIBILITY_MODIFIER, "Redundant visibility modifier")
             map.put(REDUNDANT_MODALITY_MODIFIER, "Redundant modality modifier")
diff --git a/compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/session/FirSessionFactory.kt b/compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/session/FirSessionFactory.kt
index a73a951461c..0ef8dcd2a0f 100644
--- a/compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/session/FirSessionFactory.kt
+++ b/compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/session/FirSessionFactory.kt
@@ -17,6 +17,7 @@ import org.jetbrains.kotlin.fir.analysis.checkers.expression.ExpressionCheckers
 import org.jetbrains.kotlin.fir.analysis.checkers.type.TypeCheckers
 import org.jetbrains.kotlin.fir.analysis.checkersComponent
 import org.jetbrains.kotlin.fir.analysis.extensions.additionalCheckers
+import org.jetbrains.kotlin.fir.analysis.jvm.diagnostics.FirJvmDefaultErrorMessages
 import org.jetbrains.kotlin.fir.checkers.registerCommonCheckers
 import org.jetbrains.kotlin.fir.checkers.registerJvmCheckers
 import org.jetbrains.kotlin.fir.deserialization.ModuleDataProvider
@@ -180,6 +181,7 @@ object FirSessionFactory {
                 dependenciesSymbolProvider
             )
 
+            FirJvmDefaultErrorMessages.installJvmErrorMessages()
             FirSessionConfigurator(this).apply {
                 registerCommonCheckers()
                 registerJvmCheckers()
diff --git a/idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/diagnostics/AbstractFirIdeDiagnosticsCollector.kt b/idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/diagnostics/AbstractFirIdeDiagnosticsCollector.kt
index 6aad9fd3614..a9dca2ea83d 100644
--- a/idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/diagnostics/AbstractFirIdeDiagnosticsCollector.kt
+++ b/idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/diagnostics/AbstractFirIdeDiagnosticsCollector.kt
@@ -18,6 +18,7 @@ import org.jetbrains.kotlin.fir.analysis.collectors.components.*
 import org.jetbrains.kotlin.fir.analysis.diagnostics.DiagnosticReporter
 import org.jetbrains.kotlin.fir.analysis.jvm.checkers.JvmDeclarationCheckers
 import org.jetbrains.kotlin.fir.analysis.jvm.checkers.JvmExpressionCheckers
+import org.jetbrains.kotlin.fir.analysis.jvm.diagnostics.FirJvmDefaultErrorMessages
 import org.jetbrains.kotlin.fir.moduleData
 import org.jetbrains.kotlin.idea.fir.low.level.api.sessions.moduleSourceInfo
 import org.jetbrains.kotlin.platform.SimplePlatform
@@ -42,6 +43,7 @@ private object CheckersFactory {
     ): List<AbstractDiagnosticCollectorComponent> {
         val moduleInfo = session.moduleData.moduleSourceInfo
         val platform = moduleInfo.platform.componentPlatforms.first()
+        installPlatformSpecificErrorMessages(platform)
         val declarationCheckers = createDeclarationCheckers(useExtendedCheckers, platform)
         val expressionCheckers = createExpressionCheckers(useExtendedCheckers, platform)
         val typeCheckers = createTypeCheckers(useExtendedCheckers)
@@ -67,6 +69,8 @@ private object CheckersFactory {
                 add(CommonDeclarationCheckers)
                 when (platform) {
                     is JvmPlatform -> add(JvmDeclarationCheckers)
+                    else -> {
+                    }
                 }
             }
         }
@@ -80,11 +84,21 @@ private object CheckersFactory {
                 add(CommonExpressionCheckers)
                 when (platform) {
                     is JvmPlatform -> add(JvmExpressionCheckers)
+                    else -> {
+                    }
                 }
             }
         }
     }
 
+    private fun installPlatformSpecificErrorMessages(platform: SimplePlatform) {
+        when (platform) {
+            is JvmPlatform -> FirJvmDefaultErrorMessages.installJvmErrorMessages()
+            else -> {
+            }
+        }
+    }
+
     private fun createTypeCheckers(useExtendedCheckers: Boolean): TypeCheckers? =
         if (useExtendedCheckers) null else CommonTypeCheckers
 
diff --git a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDataClassConverters.kt b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDataClassConverters.kt
index b6f82d672b4..42f5b9bf4bf 100644
--- a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDataClassConverters.kt
+++ b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDataClassConverters.kt
@@ -3402,7 +3402,13 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
-    add(FirErrors.JAVA_TYPE_MISMATCH) { firDiagnostic ->
+    add(FirJvmErrors.CONFLICTING_JVM_DECLARATIONS) { firDiagnostic ->
+        ConflictingJvmDeclarationsImpl(
+            firDiagnostic as FirPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirJvmErrors.JAVA_TYPE_MISMATCH) { firDiagnostic ->
         JavaTypeMismatchImpl(
             firSymbolBuilder.typeBuilder.buildKtType(firDiagnostic.a),
             firSymbolBuilder.typeBuilder.buildKtType(firDiagnostic.b),
@@ -3410,10 +3416,4 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
-    add(FirJvmErrors.CONFLICTING_JVM_DECLARATIONS) { firDiagnostic ->
-        ConflictingJvmDeclarationsImpl(
-            firDiagnostic as FirPsiDiagnostic,
-            token,
-        )
-    }
 }
diff --git a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnostics.kt b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnostics.kt
index c58ded98b86..58adeecfde2 100644
--- a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnostics.kt
+++ b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnostics.kt
@@ -2372,14 +2372,14 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = ReturnForBuiltInSuspend::class
     }
 
+    abstract class ConflictingJvmDeclarations : KtFirDiagnostic<PsiElement>() {
+        override val diagnosticClass get() = ConflictingJvmDeclarations::class
+    }
+
     abstract class JavaTypeMismatch : KtFirDiagnostic<KtExpression>() {
         override val diagnosticClass get() = JavaTypeMismatch::class
         abstract val expectedType: KtType
         abstract val actualType: KtType
     }
 
-    abstract class ConflictingJvmDeclarations : KtFirDiagnostic<PsiElement>() {
-        override val diagnosticClass get() = ConflictingJvmDeclarations::class
-    }
-
 }
diff --git a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnosticsImpl.kt b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnosticsImpl.kt
index 67d5f7a1b6a..a2e6503a9d3 100644
--- a/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnosticsImpl.kt
+++ b/idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnosticsImpl.kt
@@ -3834,6 +3834,13 @@ internal class ReturnForBuiltInSuspendImpl(
     override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
 }
 
+internal class ConflictingJvmDeclarationsImpl(
+    firDiagnostic: FirPsiDiagnostic,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.ConflictingJvmDeclarations(), KtAbstractFirDiagnostic<PsiElement> {
+    override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
+}
+
 internal class JavaTypeMismatchImpl(
     override val expectedType: KtType,
     override val actualType: KtType,
@@ -3843,10 +3850,3 @@ internal class JavaTypeMismatchImpl(
     override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
 }
 
-internal class ConflictingJvmDeclarationsImpl(
-    firDiagnostic: FirPsiDiagnostic,
-    override val token: ValidityToken,
-) : KtFirDiagnostic.ConflictingJvmDeclarations(), KtAbstractFirDiagnostic<PsiElement> {
-    override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
-}
-