fix: refs #4290 - fixes anyof for non objects

modules/swagger-core/src/main/java/io/swagger/v3/core/jackson/ModelResolver.java

@@ -805,6 +805,9 @@ public Schema resolve(AnnotatedType annotatedType, ModelConverterContext context
             allOfFiltered.forEach(c -> {
                 Schema allOfRef = context.resolve(new AnnotatedType().type(c).jsonViewAnnotation(annotatedType.getJsonViewAnnotation()));
                 Schema refSchema = new Schema().$ref(allOfRef.getName());
+                if (StringUtils.isBlank(allOfRef.getName())) {
+                    refSchema = allOfRef;
+                }
                 // allOf could have already being added during subtype resolving
                 if (composedSchema.getAllOf() == null || !composedSchema.getAllOf().contains(refSchema)) {
                     composedSchema.addAllOfItem(refSchema);
@@ -822,7 +825,11 @@ public Schema resolve(AnnotatedType annotatedType, ModelConverterContext context
                     .collect(Collectors.toList());
             anyOfFiltered.forEach(c -> {
                 Schema anyOfRef = context.resolve(new AnnotatedType().type(c).jsonViewAnnotation(annotatedType.getJsonViewAnnotation()));
-                composedSchema.addAnyOfItem(new Schema().$ref(anyOfRef.getName()));
+                if (StringUtils.isNotBlank(anyOfRef.getName())) {
+                    composedSchema.addAnyOfItem(new Schema().$ref(anyOfRef.getName()));
+                } else {
+                    composedSchema.addAnyOfItem(anyOfRef);
+                }
                 // remove shared properties defined in the parent
                 if (isSubtype(beanDesc.getClassInfo(), c)) {
                     removeParentProperties(composedSchema, anyOfRef);

modules/swagger-core/src/test/java/io/swagger/v3/core/resolving/Ticket4290Test.java

@@ -0,0 +1,33 @@
+package io.swagger.v3.core.resolving;
+
+import io.swagger.v3.core.converter.AnnotatedType;
+import io.swagger.v3.core.converter.ModelConverterContextImpl;
+import io.swagger.v3.core.jackson.ModelResolver;
+import io.swagger.v3.core.matchers.SerializationMatchers;
+import io.swagger.v3.core.resolving.resources.Issue4290;
+import io.swagger.v3.oas.models.media.Schema;
+import org.testng.annotations.Test;
+
+public class Ticket4290Test extends SwaggerTestBase {
+    @Test
+    public void testAnyOf() throws Exception {
+        final ModelResolver modelResolver = new ModelResolver(mapper());
+
+        final ModelConverterContextImpl context = new ModelConverterContextImpl(modelResolver);
+
+        final Schema model = context
+                .resolve(new AnnotatedType(Issue4290.class));
+
+        SerializationMatchers.assertEqualsToYaml(context.getDefinedModels(), "Issue4290:\n" +
+                "  type: object\n" +
+                "  properties:\n" +
+                "    value:\n" +
+                "      type: object\n" +
+                "      description: \"A string, a number or a boolean\"\n" +
+                "      anyOf:\n" +
+                "      - type: string\n" +
+                "      - type: number\n" +
+                "      - type: boolean");
+    }
+
+}

modules/swagger-core/src/test/java/io/swagger/v3/core/resolving/resources/Issue4290.java

@@ -0,0 +1,9 @@
+package io.swagger.v3.core.resolving.resources;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+public class Issue4290 {
+    @Schema(description = "A string, a number or a boolean", anyOf = { String.class, Number.class, Boolean.class })
+    public Object value;
+
+}