diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
index b0778f11f038..2ba884ebb86c 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
@@ -22,6 +22,7 @@ import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.PathItem;
 import io.swagger.v3.oas.models.media.ArraySchema;
+import io.swagger.v3.oas.models.media.ComposedSchema;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.servers.Server;
 import io.swagger.v3.parser.util.SchemaTypeUtil;
@@ -796,7 +797,7 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
             }
 
             return String.format(Locale.ROOT, pattern, typeDeclaration);
-        } else if (ModelUtils.isMapSchema(schema)) {
+        } else if (ModelUtils.isMapSchema(schema) && !(schema instanceof ComposedSchema)) {
             final String pattern;
             if (fullJavaUtil) {
                 pattern = "new java.util.HashMap<%s>()";