[Java][jersey2] Fix generated client code for oneOf models if datatype includes arrays

.github/workflows/samples-java-client-jdk11.yaml

@@ -13,6 +13,8 @@ on:
       - samples/client/others/java/okhttp-gson-oneOf/**
       - samples/client/others/java/resttemplate-useAbstractionForFiles/**
       - samples/client/others/java/webclient-useAbstractionForFiles/**
+      - samples/client/others/java/jersey2-oneOf-duplicates/**
+      - samples/client/others/java/jersey2-oneOf-Mixed/**
   pull_request:
     paths:
       - 'samples/client/petstore/java/**'
@@ -25,6 +27,8 @@ on:
       - samples/client/others/java/okhttp-gson-oneOf/**
       - samples/client/others/java/resttemplate-useAbstractionForFiles/**
       - samples/client/others/java/webclient-useAbstractionForFiles/**
+      - samples/client/others/java/jersey2-oneOf-duplicates/**
+      - samples/client/others/java/jersey2-oneOf-Mixed/**
 jobs:
   build:
     name: Build Java Client JDK11
@@ -71,6 +75,8 @@ jobs:
           - samples/client/others/java/okhttp-gson-oneOf/
           - samples/client/others/java/resttemplate-useAbstractionForFiles/
           - samples/client/others/java/webclient-useAbstractionForFiles/
+          - samples/client/others/java/jersey2-oneOf-duplicates/
+          - samples/client/others/java/jersey2-oneOf-Mixed/
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v4

bin/configs/java-jersey2-8-oneOfDuplicateList.yaml

@@ -0,0 +1,7 @@
+generatorName: java
+outputDir: samples/client/others/java/jersey2-oneOf-duplicates
+library: jersey2
+inputSpec: modules/openapi-generator/src/test/resources/3_0/oneOf_duplicateArray.yaml
+templateDir: modules/openapi-generator/src/main/resources/Java
+additionalProperties:
+  hideGenerationTimestamp: "true"

bin/configs/java-jersey2-8-oneOfMixed.yaml

@@ -0,0 +1,7 @@
+generatorName: java
+outputDir: samples/client/others/java/jersey2-oneOf-Mixed
+library: jersey2
+inputSpec: modules/openapi-generator/src/test/resources/3_0/oneOf_primitiveAndArray.yaml
+templateDir: modules/openapi-generator/src/main/resources/Java
+additionalProperties:
+  hideGenerationTimestamp: "true"

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenConfig.java

@@ -350,6 +350,8 @@ public interface CodegenConfig {
     */
     String generatorLanguageVersion();
 
+    boolean isTypeErasedGenerics();
+
     List<VendorExtension> getSupportedVendorExtensions();
 
     boolean getUseInlineModelResolver();

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenProperty.java

@@ -1139,6 +1139,7 @@ public void setIsEnum(boolean isEnum) {
         this.isEnum = isEnum;
     }
 
+
     @Override
     public String toString() {
         final StringBuilder sb = new StringBuilder("CodegenProperty{");

modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java

@@ -8421,12 +8421,17 @@ private List<CodegenProperty> getComposedProperties(List<Schema> xOfCollection,
             xOf.add(cp);
             i += 1;
 
-            if (dataTypeSet.contains(cp.dataType)) {
+            if (dataTypeSet.contains(cp.dataType)
+                    || (isTypeErasedGenerics() && dataTypeSet.contains(cp.baseType))) {
                 // add "x-duplicated-data-type" to indicate if the dataType already occurs before
                 // in other sub-schemas of allOf/anyOf/oneOf
                 cp.vendorExtensions.putIfAbsent("x-duplicated-data-type", true);
             } else {
-                dataTypeSet.add(cp.dataType);
+                if(isTypeErasedGenerics()) {
+                    dataTypeSet.add(cp.baseType);
+                } else {
+                    dataTypeSet.add(cp.dataType);
+                }
             }
         }
         return xOf;
@@ -8463,11 +8468,16 @@ public Set<String> getOpenAPIGeneratorIgnoreList() {
         return openapiGeneratorIgnoreList;
     }
 
+    @Override
+    public boolean isTypeErasedGenerics() {
+        return false;
+    }
+
     /*
-    A function to convert yaml or json ingested strings like property names
-    And convert special characters like newline, tab, carriage return
-    Into strings that can be rendered in the language that the generator will output to
-    */
+        A function to convert yaml or json ingested strings like property names
+        And convert special characters like newline, tab, carriage return
+        Into strings that can be rendered in the language that the generator will output to
+        */
     protected String handleSpecialCharacters(String name) { return name; }
 
     /**

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

@@ -21,6 +21,7 @@
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.google.common.base.Strings;
 import com.google.common.collect.Sets;
+import com.samskivert.mustache.Mustache;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.PathItem;
@@ -666,6 +667,14 @@ public void processOpts() {
             this.setContainerDefaultToNull(Boolean.parseBoolean(additionalProperties.get(CONTAINER_DEFAULT_TO_NULL).toString()));
         }
         additionalProperties.put(CONTAINER_DEFAULT_TO_NULL, containerDefaultToNull);
+
+        additionalProperties.put("sanitizeGeneric", (Mustache.Lambda) (fragment, writer) -> {
+            String content = fragment.execute();
+            for (final String s: List.of("<", ">", ",", " ")) {
+                content = content.replace(s, "");
+            }
+            writer.write(content);
+        });
     }
 
     @Override
@@ -1592,15 +1601,29 @@ public CodegenModel fromModel(String name, Schema model) {
         }
 
         // additional import for different cases
-        addAdditionalImports(codegenModel, codegenModel.oneOf);
-        addAdditionalImports(codegenModel, codegenModel.anyOf);
+        addAdditionalImports(codegenModel, codegenModel.getComposedSchemas());
         return codegenModel;
     }
 
-    private void addAdditionalImports(CodegenModel model, Set<String> dataTypeSet) {
-        for (String dataType : dataTypeSet) {
-            if (null != importMapping().get(dataType)) {
-                model.imports.add(dataType);
+    private void addAdditionalImports(CodegenModel model, CodegenComposedSchemas composedSchemas) {
+        if(composedSchemas == null) {
+            return;
+        }
+
+        final List<List<CodegenProperty>> propertyLists = Arrays.asList(
+                composedSchemas.getAnyOf(),
+                composedSchemas.getOneOf(),
+                composedSchemas.getAllOf());
+        for(final List<CodegenProperty> propertyList : propertyLists){
+            if(propertyList == null)
+            {
+                continue;
+            }
+            for (CodegenProperty cp : propertyList) {
+                final String dataType = cp.baseType;
+                if (null != importMapping().get(dataType)) {
+                    model.imports.add(dataType);
+                }
             }
         }
     }
@@ -2507,4 +2530,9 @@ public static void addImports(List<Map<String, String>> imports, CodegenModel cm
             imports.add(importsItem);
         }
     }
+
+    @Override
+    public boolean isTypeErasedGenerics() {
+        return true;
+    }
 }

modules/openapi-generator/src/main/resources/Java/libraries/jersey2/oneof_model.mustache

@@ -78,37 +78,74 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
             boolean typeCoercion = ctxt.isEnabled(MapperFeature.ALLOW_COERCION_OF_SCALARS);
             int match = 0;
             JsonToken token = tree.traverse(jp.getCodec()).nextToken();
+            {{#composedSchemas}}
             {{#oneOf}}
-            // deserialize {{{.}}}
+            // deserialize {{{dataType}}}{{#isNullable}} (nullable){{/isNullable}}
             try {
+                {{^isArray}}
                 boolean attemptParsing = true;
-                // ensure that we respect type coercion as set on the client ObjectMapper
-                if ({{{.}}}.class.equals(Integer.class) || {{{.}}}.class.equals(Long.class) || {{{.}}}.class.equals(Float.class) || {{{.}}}.class.equals(Double.class) || {{{.}}}.class.equals(Boolean.class) || {{{.}}}.class.equals(String.class)) {
-                    attemptParsing = typeCoercion;
-                    if (!attemptParsing) {
-                        attemptParsing |= (({{{.}}}.class.equals(Integer.class) || {{{.}}}.class.equals(Long.class)) && token == JsonToken.VALUE_NUMBER_INT);
-                        attemptParsing |= (({{{.}}}.class.equals(Float.class) || {{{.}}}.class.equals(Double.class)) && token == JsonToken.VALUE_NUMBER_FLOAT);
-                        attemptParsing |= ({{{.}}}.class.equals(Boolean.class) && (token == JsonToken.VALUE_FALSE || token == JsonToken.VALUE_TRUE));
-                        attemptParsing |= ({{{.}}}.class.equals(String.class) && token == JsonToken.VALUE_STRING);
-                        {{#isNullable}}
-                        attemptParsing |= (token == JsonToken.VALUE_NULL);
-                        {{/isNullable}}
-                    }
+                {{#isPrimitiveType}}
+                attemptParsing = typeCoercion; //respect type coercion setting
+                if (!attemptParsing) {
+                    {{#isString}}
+                    attemptParsing |= (token == JsonToken.VALUE_STRING);
+                    {{/isString}}
+                    {{#isInteger}}
+                    attemptParsing |= (token == JsonToken.VALUE_NUMBER_INT);
+                    {{/isInteger}}
+                    {{#isLong}}
+                    attemptParsing |= (token == JsonToken.VALUE_NUMBER_INT);
+                    {{/isLong}}
+                    {{#isShort}}
+                    attemptParsing |= (token == JsonToken.VALUE_NUMBER_INT);
+                    {{/isShort}}
+                    {{#isFloat}}
+                    attemptParsing |= (token == JsonToken.VALUE_NUMBER_FLOAT);
+                    {{/isFloat}}
+                    {{#isDouble}}
+                    attemptParsing |= (token == JsonToken.VALUE_NUMBER_FLOAT);
+                    {{/isDouble}}
+                    {{#isNumber}}
+                    attemptParsing |= (token == JsonToken.VALUE_NUMBER_FLOAT);
+                    {{/isNumber}}
+                    {{#isDecimal}}
+                    attemptParsing |= (token == JsonToken.VALUE_NUMBER_FLOAT);
+                    {{/isDecimal}}
+                    {{#isBoolean}}
+                    attemptParsing |= (token == JsonToken.VALUE_FALSE || token == JsonToken.VALUE_TRUE));
+                    {{/isBoolean}}
+                    {{#isNullable}}
+                    attemptParsing |= (token == JsonToken.VALUE_NULL);
+                    {{/isNullable}}
                 }
+                {{/isPrimitiveType}}
                 if (attemptParsing) {
-                    deserialized = tree.traverse(jp.getCodec()).readValueAs({{{.}}}.class);
+                    deserialized = tree.traverse(jp.getCodec()).readValueAs({{{dataType}}}.class);
                     // TODO: there is no validation against JSON schema constraints
                     // (min, max, enum, pattern...), this does not perform a strict JSON
                     // validation, which means the 'match' count may be higher than it should be.
                     match++;
-                    log.log(Level.FINER, "Input data matches schema '{{{.}}}'");
+                    log.log(Level.FINER, "Input data matches schema '{{{dataType}}}'");
                 }
+                {{/isArray}}
+                {{#isArray}}
+                if (token == JsonToken.START_ARRAY) {
+                    final TypeReference<{{{dataType}}}> ref = new TypeReference<{{{dataType}}}>(){};
+                    deserialized = tree.traverse(jp.getCodec()).readValueAs(ref);
+                    // TODO: there is no validation against JSON schema constraints
+                    // (min, max, enum, pattern...), this does not perform a strict JSON
+                    // validation, which means the 'match' count may be higher than it should be.
+                    match++;
+                    log.log(Level.FINER, "Input data matches schema '{{{dataType}}}'");
+                }
+                {{/isArray}}
             } catch (Exception e) {
                 // deserialization failed, continue
-                log.log(Level.FINER, "Input data does not match schema '{{{.}}}'", e);
+                log.log(Level.FINER, "Input data does not match schema '{{{dataType}}}'", e);
             }
 
             {{/oneOf}}
+            {{/composedSchemas}}
             if (match == 1) {
                 {{classname}} ret = new {{classname}}();
                 ret.setActualInstance(deserialized);
@@ -152,13 +189,17 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         return Objects.hash(getActualInstance(), isNullable(), getSchemaType(), additionalProperties);
     }
     {{/additionalPropertiesType}}
+    {{#composedSchemas}}
     {{#oneOf}}
-    public {{classname}}({{{.}}} o) {
+    {{^vendorExtensions.x-duplicated-data-type}}
+    public {{classname}}({{{baseType}}} o) {
         super("oneOf", {{#isNullable}}Boolean.TRUE{{/isNullable}}{{^isNullable}}Boolean.FALSE{{/isNullable}});
         setActualInstance(o);
     }
+    {{/vendorExtensions.x-duplicated-data-type}}
 
     {{/oneOf}}
+    {{/composedSchemas}}
     static {
         {{#oneOf}}
         schemas.put("{{{.}}}", new GenericType<{{{.}}}>() {
@@ -198,13 +239,17 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         }
 
         {{/isNullable}}
+        {{#composedSchemas}}
         {{#oneOf}}
-        if (JSON.isInstanceOf({{{.}}}.class, instance, new HashSet<>())) {
+        {{^vendorExtensions.x-duplicated-data-type}}
+        if (JSON.isInstanceOf({{{baseType}}}.class, instance, new HashSet<>())) {
             super.setActualInstance(instance);
             return;
         }
 
+        {{/vendorExtensions.x-duplicated-data-type}}
         {{/oneOf}}
+        {{/composedSchemas}}
         throw new RuntimeException("Invalid instance type. Must be {{#oneOf}}{{{.}}}{{^-last}}, {{/-last}}{{/oneOf}}");
     }
 
@@ -219,17 +264,26 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         return super.getActualInstance();
     }
 
+    {{#composedSchemas}}
     {{#oneOf}}
     /**
-     * Get the actual instance of `{{{.}}}`. If the actual instance is not `{{{.}}}`,
+     * Get the actual instance of `{{{dataType}}}`. If the actual instance is not `{{{dataType}}}`,
      * the ClassCastException will be thrown.
      *
-     * @return The actual instance of `{{{.}}}`
-     * @throws ClassCastException if the instance is not `{{{.}}}`
+     * @return The actual instance of `{{{dataType}}}`
+     * @throws ClassCastException if the instance is not `{{{dataType}}}`
      */
-    public {{{.}}} get{{{.}}}() throws ClassCastException {
-        return ({{{.}}})super.getActualInstance();
+    {{^isArray}}
+    public {{{dataType}}} get{{{dataType}}}() throws ClassCastException {
+        return ({{{dataType}}})super.getActualInstance();
     }
+    {{/isArray}}
+    {{#isArray}}
+        public {{{dataType}}} get{{#sanitizeGeneric}}{{{dataType}}}{{/sanitizeGeneric}}() throws ClassCastException {
+        return ({{{dataType}}})super.getActualInstance();
+        }
+    {{/isArray}}
 
     {{/oneOf}}
+    {{/composedSchemas}}
 }

modules/openapi-generator/src/test/resources/3_0/oneOf_duplicateArray.yaml

@@ -0,0 +1,29 @@
+openapi: 3.0.1
+info:
+  version: 1.0.0
+  title: Example - oneOf data type
+  license:
+    name: MIT
+servers:
+  - url: http://api.example.xyz/v1
+paths:
+  /example:
+    get:
+      operationId: list
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Example"
+components:
+  schemas:
+    Example:
+      oneOf:
+        - type: array
+          items:
+            type: number
+        - type: array
+          items:
+            type: integer

modules/openapi-generator/src/test/resources/3_0/oneOf_primitiveAndArray.yaml

@@ -0,0 +1,28 @@
+openapi: 3.0.1
+info:
+  version: 1.0.0
+  title: Example - oneOf data type
+  license:
+    name: MIT
+servers:
+  - url: http://api.example.xyz/v1
+paths:
+  /example:
+    get:
+      operationId: list
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Example"
+components:
+  schemas:
+    Example:
+      oneOf:
+        - type: string
+          format: uuid
+        - type: array
+          items:
+            type: integer