[Java][jersey2] Fix RuntimeException when HTTP signature parameters are not configured (#6457)

* Mustache template should use invokerPackage tag to generate import

* fix runtime exception when HttpSignatureAuth is not set

* fix runtime exception when HttpSignatureAuth is not set

Author: sebastien-rosset

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

@@ -200,8 +200,6 @@ public class ApiClient {
     {{#isHttpSignature}}
     if (auth instanceof HttpSignatureAuth) {
       authentications.put("{{name}}", auth);
-    } else {
-      authentications.put("{{name}}", null);
     }
     {{/isHttpSignature}}
     {{/isBasic}}
@@ -246,10 +244,20 @@ public class ApiClient {
     return this;
   }
 
+  /**
+   * Returns the base URL to the location where the OpenAPI document is being served.
+   *
+   * @return The base URL to the target host.
+   */
   public String getBasePath() {
     return basePath;
   }
 
+  /**
+   * Sets the base URL to the location where the OpenAPI document is being served.
+   *
+   * @param basePath The base URL to the target host.
+   */
   public ApiClient setBasePath(String basePath) {
     this.basePath = basePath;
     {{#hasOAuthMethods}}
@@ -1281,7 +1289,7 @@ public class ApiClient {
     for (String authName : authNames) {
       Authentication auth = authentications.get(authName);
       if (auth == null) {
-        throw new RuntimeException("Authentication undefined: " + authName);
+        continue;
       }
       auth.applyToParams(queryParams, headerParams, cookieParams, payload, method, uri);
     }

samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/ApiClient.java

@@ -167,10 +167,20 @@ public ApiClient setHttpClient(Client httpClient) {
     return this;
   }
 
+  /**
+   * Returns the base URL to the location where the OpenAPI document is being served.
+   *
+   * @return The base URL to the target host.
+   */
   public String getBasePath() {
     return basePath;
   }
 
+  /**
+   * Sets the base URL to the location where the OpenAPI document is being served.
+   *
+   * @param basePath The base URL to the target host.
+   */
   public ApiClient setBasePath(String basePath) {
     this.basePath = basePath;
     setOauthBasePath(basePath);
@@ -1183,7 +1193,7 @@ protected void updateParamsForAuth(String[] authNames, List<Pair> queryParams, M
     for (String authName : authNames) {
       Authentication auth = authentications.get(authName);
       if (auth == null) {
-        throw new RuntimeException("Authentication undefined: " + authName);
+        continue;
       }
       auth.applyToParams(queryParams, headerParams, cookieParams, payload, method, uri);
     }