feat: default values

asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/AsyncAPI.java

@@ -13,6 +13,7 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -44,7 +45,8 @@ public class AsyncAPI extends ExtendableObject {
      * Patch versions will correspond to patches of this document.
      */
     @NotNull
-    private String asyncapi = "2.0.0";
+    @Builder.Default
+    private final String asyncapi = "2.0.0";
 
     /**
      * Identifier of the application the AsyncAPI document is defining.
@@ -74,7 +76,8 @@ public class AsyncAPI extends ExtendableObject {
      * Provides metadata about the API. The metadata can be used by the clients if needed.
      */
     @NotNull
-    private Info info;
+    @Builder.Default
+    private Info info = new Info();
 
     /**
      * Provides connection details of servers.
@@ -92,7 +95,8 @@ public class AsyncAPI extends ExtendableObject {
      * Channels are also known as "topics", "routing keys", "event types" or "paths".
      */
     @NotNull
-    private Map<String, ChannelItem> channels;
+    @Builder.Default
+    private Map<String, ChannelItem> channels = new HashMap<>();
 
     /**
      * An element to hold various schemas for the specification.

asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/ExternalDocumentation.java

@@ -35,6 +35,7 @@ public class ExternalDocumentation extends ExtendableObject {
      * The URL for the target documentation. Value MUST be in the format of a URL.
      */
     @NotNull
-    private String url;
+    @Builder.Default
+    private String url = "";
 
 }

asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/Reference.java

@@ -33,6 +33,6 @@ public class Reference {
      */
     @NotNull
     @JsonProperty(value = "$ref")
-    private String ref;
+    private String ref = "";
 
 }

asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/Tag.java

@@ -27,7 +27,8 @@ public class Tag extends ExtendableObject {
      * Required. The name of the tag.
      */
     @NotNull
-    private String name;
+    @Builder.Default
+    private String name = "";
 
     /**
      * A short description for the tag. CommonMark syntax can be used for rich text representation.

asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/channel/message/CorrelationId.java

@@ -37,6 +37,7 @@ public class CorrelationId extends ExtendableObject {
      * A runtime expression that specifies the location of the correlation ID.
      */
     @NotNull
-    private String location;
+    @Builder.Default
+    private String location = "";
 
 }

asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/info/Info.java

@@ -31,7 +31,8 @@ public class Info extends ExtendableObject {
      */
     @NotNull
     @JsonProperty
-    private String title;
+    @Builder.Default
+    private String title = "";
 
     /**
      * Required.
@@ -40,7 +41,8 @@ public class Info extends ExtendableObject {
      */
     @NotNull
     @JsonProperty
-    private String version;
+    @Builder.Default
+    private String version = "";
 
     /**
      * A short description of the application. CommonMark syntax can be used for rich text representation.

asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/info/License.java

@@ -27,7 +27,8 @@ public class License extends ExtendableObject {
      * Required. The license name used for the API.
      */
     @NotNull
-    private String name;
+    @Builder.Default
+    private String name = "";
 
     /**
      * A URL to the license used for the API. MUST be in the format of a URL.

asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/server/Server.java

@@ -42,7 +42,8 @@ public class Server extends ExtendableObject {
      */
     @NotNull
     @JsonProperty
-    private String url;
+    @Builder.Default
+    private String url = "";
 
     /**
      * REQUIRED.
@@ -52,7 +53,8 @@ public class Server extends ExtendableObject {
      */
     @NotNull
     @JsonProperty
-    private String protocol;
+    @Builder.Default
+    private String protocol = "";
 
     /**
      * The version of the protocol used for connection. For instance: AMQP 0.9.1, HTTP 2.0, Kafka 1.0.0, etc.

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/AsyncAPI.java

@@ -13,6 +13,7 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -44,7 +45,8 @@ public class AsyncAPI extends ExtendableObject {
      * Patch versions will correspond to patches of this document.
      */
     @NotNull
-    private String asyncapi = "2.6.0";
+    @Builder.Default
+    private final String asyncapi = "2.6.0";
 
     /**
      * Identifier of the application the AsyncAPI document is defining.
@@ -64,7 +66,8 @@ public class AsyncAPI extends ExtendableObject {
      * Provides metadata about the API. The metadata can be used by the clients if needed.
      */
     @NotNull
-    private Info info;
+    @Builder.Default
+    private Info info = new Info();
 
     /**
      * TODO: references
@@ -93,7 +96,8 @@ public class AsyncAPI extends ExtendableObject {
      * Channels are also known as "topics", "routing keys", "event types" or "paths".
      */
     @NotNull
-    private Map<String, ChannelItem> channels;
+    @Builder.Default
+    private Map<String, ChannelItem> channels = new HashMap<>();
 
     /**
      * An element to hold various schemas for the specification.

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/ExternalDocumentation.java

@@ -35,6 +35,7 @@ public class ExternalDocumentation extends ExtendableObject {
      * The URL for the target documentation. Value MUST be in the format of a URL.
      */
     @NotNull
-    private String url;
+    @Builder.Default
+    private String url = "";
 
 }

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/Reference.java

@@ -35,6 +35,6 @@ public class Reference {
      */
     @NotNull
     @JsonProperty(value = "$ref")
-    private String ref;
+    private String ref = "";
 
 }

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/Tag.java

@@ -27,7 +27,8 @@ public class Tag extends ExtendableObject {
      * Required. The name of the tag.
      */
     @NotNull
-    private String name;
+    @Builder.Default
+    private String name = "";
 
     /**
      * A short description for the tag. <a href="https://spec.commonmark.org/">CommonMark syntax</a> can be used for rich text representation.

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/channel/message/CorrelationId.java

@@ -37,6 +37,7 @@ public class CorrelationId extends ExtendableObject {
      * A <a href="https://www.asyncapi.com/docs/reference/specification/v2.6.0#runtimeExpression">runtime expression</a> that specifies the location of the correlation ID.
      */
     @NotNull
-    private String location;
+    @Builder.Default
+    private String location = "";
 
 }

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/channel/message/OneOfMessages.java

@@ -9,6 +9,7 @@
 import lombok.NoArgsConstructor;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.LinkedList;
 import java.util.List;
 
 /**
@@ -30,7 +31,8 @@ public class OneOfMessages {
      * </ul>
      */
     @NotNull
+    @Builder.Default
     @JsonDeserialize(using = MessagesDeserializer.class)
-    private List<Object> oneOf;
+    private List<Object> oneOf = new LinkedList<>();
 
 }

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/info/Info.java

@@ -29,15 +29,17 @@ public class Info extends ExtendableObject {
      * The title of the application.
      */
     @NotNull
-    private String title;
+    @Builder.Default
+    private String title = "";
 
     /**
      * Required.
      * <p>
      * Provides the version of the application API (not to be confused with the specification version).
      */
     @NotNull
-    private String version;
+    @Builder.Default
+    private String version = "";
 
     /**
      * A short description of the application. CommonMark syntax can be used for rich text representation.

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/info/License.java

@@ -27,7 +27,8 @@ public class License extends ExtendableObject {
      * Required. The license name used for the API.
      */
     @NotNull
-    private String name;
+    @Builder.Default
+    private String name = "";
 
     /**
      * A URL to the license used for the API. MUST be in the format of a URL.

asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/server/Server.java

@@ -42,7 +42,8 @@ public class Server extends ExtendableObject {
      * made when a variable is named in {brackets}.
      */
     @NotNull
-    private String url;
+    @Builder.Default
+    private String url = "";
 
     /**
      * REQUIRED.
@@ -51,7 +52,8 @@ public class Server extends ExtendableObject {
      * amqp, amqps, http, https, ibmmq, jms, kafka, kafka-secure, anypointmq, mqtt, secure-mqtt, solace, stomp, stomps, ws, wss, mercure, googlepubsub, pulsar.
      */
     @NotNull
-    private String protocol;
+    @Builder.Default
+    private String protocol = "";
 
     /**
      * The version of the protocol used for connection. For instance: AMQP 0.9.1, HTTP 2.0, Kafka 1.0.0, etc.

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/ApiKeySecurityScheme.java

@@ -26,7 +26,7 @@ public class ApiKeySecurityScheme extends SecurityScheme {
      * The location of the API key.
      */
     @NotNull
-    private ApiKeyLocation in;
+    private ApiKeyLocation in = ApiKeyLocation.USER;
 
     @Builder(builderMethodName = "apiKeySecuritySchemeBuilder")
     public ApiKeySecurityScheme(@NotNull Type type,

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/OpenIdConnectSecurityScheme.java

@@ -25,7 +25,7 @@ public class OpenIdConnectSecurityScheme extends SecurityScheme {
      * OpenId Connect URL to discover OAuth2 configuration values. This MUST be in the form of a URL.
      */
     @NotNull
-    private String openIdConnectUrl;
+    private String openIdConnectUrl = "";
 
     @Builder(builderMethodName = "openIdConnectSecurityScheme")
     public OpenIdConnectSecurityScheme(@NotNull Type type,

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/SecurityScheme.java

@@ -80,7 +80,7 @@ public class SecurityScheme extends ExtendableObject {
      * </ul>
      */
     @NotNull
-    private Type type;
+    private Type type = Type.USER_PASSWORD;
 
     /**
      * A short description for security scheme. <a href="http://spec.commonmark.org/">CommonMark syntax</a> MAY be used for rich text representation.

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/http/HttpApiKeySecurityScheme.java

@@ -27,7 +27,7 @@ public class HttpApiKeySecurityScheme extends SecurityScheme {
      * The name of the header, query or cookie parameter to be used.
      */
     @NotNull
-    private String name;
+    private String name = "";
 
     /**
      * REQUIRED.

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/http/HttpSecurityScheme.java

@@ -26,7 +26,7 @@ public class HttpSecurityScheme extends SecurityScheme {
      * The name of the HTTP Authorization scheme to be used in the <a href="https://tools.ietf.org/html/rfc7235#section-5.1">Authorization header as defined in RFC7235</a>.
      */
     @NotNull
-    private String scheme;
+    private String scheme = "";
 
     /**
      * A hint to the client to identify how the bearer token is formatted. Bearer tokens are usually generated

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/oauth2/OAuth2SecurityScheme.java

@@ -26,7 +26,7 @@ public class OAuth2SecurityScheme extends SecurityScheme {
      * An object containing configuration information for the flow types supported.
      */
     @NotNull
-    private OAuthFlows flows;
+    private OAuthFlows flows = new OAuthFlows();
 
     @Builder(builderMethodName = "oauth2SecuritySchemeBuilder")
     public OAuth2SecurityScheme(@NotNull Type type,

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/oauth2/flow/AuthorizationCodeOAuthFlow.java

@@ -29,15 +29,15 @@ public class AuthorizationCodeOAuthFlow extends OAuthFlow {
      * The authorization URL to be used for this flow. This MUST be in the form of an absolute URL.
      */
     @NotNull
-    private String authorizationUrl;
+    private String authorizationUrl = "";
 
     /**
      * REQUIRED.
      * <p>
      * The token URL to be used for this flow. This MUST be in the form of an absolute URL.
      */
     @NotNull
-    private String tokenUrl;
+    private String tokenUrl = "";
 
     @Builder(builderMethodName = "authorizationCodeOAuthFlowBuilder")
     public AuthorizationCodeOAuthFlow(@Nullable String refreshUrl,

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/oauth2/flow/ClientCredentialsOAuthFlow.java

@@ -27,7 +27,7 @@ public class ClientCredentialsOAuthFlow extends OAuthFlow {
      * The token URL to be used for this flow. This MUST be in the form of a URL.
      */
     @NotNull
-    private String tokenUrl;
+    private String tokenUrl = "";
 
     @Builder(builderMethodName = "clientCredentialsOAuthFlowBuilder")
     public ClientCredentialsOAuthFlow(@Nullable String refreshUrl,

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/oauth2/flow/ImplicitOAuthFlow.java

@@ -27,7 +27,7 @@ public class ImplicitOAuthFlow extends OAuthFlow {
      * The authorization URL to be used for this flow. This MUST be in the form of a URL
      */
     @NotNull
-    private String authorizationUrl;
+    private String authorizationUrl = "";
 
     @Builder(builderMethodName = "implicitOAuthFlowBuilder")
     public ImplicitOAuthFlow(@Nullable String refreshUrl,

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/oauth2/flow/OAuthFlow.java

@@ -9,6 +9,7 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.HashMap;
 import java.util.Map;
 
 /**
@@ -31,14 +32,14 @@ public class OAuthFlow extends ExtendableObject {
      * The URL to be used for obtaining refresh tokens. This MUST be in the form of an absolute URL.
      */
     @Nullable
-    private String refreshUrl;
+    private String refreshUrl = "";
 
     /**
      * REQUIRED.
      * <p>
      * The available scopes for the OAuth2 security scheme. A map between the scope name and a short description for it.
      */
     @NotNull
-    private Map<String, String> scopes;
+    private Map<String, String> scopes = new HashMap<>();
 
 }

asyncapi-core/src/main/java/com/asyncapi/v2/security_scheme/oauth2/flow/PasswordOAuthFlow.java

@@ -27,7 +27,7 @@ public class PasswordOAuthFlow extends OAuthFlow {
      * The token URL to be used for this flow. This MUST be in the form of a URL.
      */
     @NotNull
-    private String tokenUrl;
+    private String tokenUrl = "";
 
     @Builder(builderMethodName = "passwordOAuthFlowBuilder")
     public PasswordOAuthFlow(@Nullable String refreshUrl,