included swagger 2.0 dependencies in order to support conversion.

Author: HugoMario

modules/swagger-codegen/pom.xml

@@ -198,6 +198,16 @@
         <diffutils-version>1.3.0</diffutils-version>
     </properties>
     <dependencies>
+        <dependency>
+            <groupId>io.swagger</groupId>
+            <artifactId>swagger-models</artifactId>
+            <version>1.5.17</version>
+        </dependency>
+        <dependency>
+            <groupId>io.swagger</groupId>
+            <artifactId>swagger-core</artifactId>
+            <version>1.5.17</version>
+        </dependency>
         <dependency>
             <groupId>io.swagger.core.v3</groupId>
             <artifactId>swagger-models</artifactId>
@@ -218,6 +228,11 @@
             <artifactId>swagger-parser-v3</artifactId>
             <version>${swagger-parser-version}</version>
         </dependency>
+        <dependency>
+            <groupId>io.swagger.parser.v3</groupId>
+            <artifactId>swagger-parser</artifactId>
+            <version>${swagger-parser-version}</version>
+        </dependency>
         <dependency>
             <groupId>com.samskivert</groupId>
             <artifactId>jmustache</artifactId>

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultGenerator.java

@@ -709,8 +709,11 @@ private Map<String, Object> buildSupportFileBundle(List<Object> allOperations, L
     @Override
     public List<File> generate() {
 
-        if (openAPI == null || config == null) {
-            throw new RuntimeException("missing swagger input or config!");
+        if (openAPI == null) {
+            throw new RuntimeException("missing OpenAPI input!");
+        }
+        if (config == null) {
+            throw new RuntimeException("missing configuration input!");
         }
         configureGeneratorProperties();
         configureSwaggerInfo();

modules/swagger-codegen/src/main/java/io/swagger/codegen/config/CodegenConfigurator.java

@@ -9,11 +9,12 @@
 import io.swagger.codegen.CodegenConfigLoader;
 import io.swagger.codegen.CodegenConstants;
 import io.swagger.codegen.auth.AuthParser;
+import io.swagger.parser.OpenAPIParser;
 import io.swagger.v3.oas.models.OpenAPI;
-import io.swagger.v3.parser.OpenAPIV3Parser;
-import io.swagger.v3.parser.OpenAPIV3Parser;
 import io.swagger.v3.core.util.Json;
 import io.swagger.v3.parser.core.models.AuthorizationValue;
+import io.swagger.v3.parser.core.models.SwaggerParseResult;
+import io.swagger.v3.parser.OpenAPIV3Parser;
 import org.apache.commons.lang3.Validate;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -429,7 +430,8 @@ public ClientOptInput toClientOptInput() {
 
         final List<AuthorizationValue> authorizationValues = AuthParser.parse(auth);
 
-        OpenAPI openAPI = new OpenAPIV3Parser().read(inputSpec, authorizationValues, null);
+        SwaggerParseResult result = new OpenAPIParser().readLocation(inputSpec, authorizationValues, null);
+        OpenAPI openAPI = result.getOpenAPI();
 
         input.opts(new ClientOpts())
                 .openAPI(openAPI);