Vert.x 3.x Json supports RFC-7493, however the JSON encoder/decoder f…

…ormat was incorrect. Users who needed to interop with Vert.x 3.x applications should have set the system property vertx.json.base64 to legacy.

This system property and mode is removed in Vert.x 5

src/main/java/io/vertx/core/impl/SysProps.java

@@ -4,11 +4,6 @@
 
 public enum SysProps {
 
-  /**
-   * Defines a mode for base64 JSON conversions that is compatible with Vert.x 3
-   */
-  JSON_BASE_64("vertx.json.base64"),
-
   /**
    * Cluster manager to use class FQN.
    *

src/main/java/io/vertx/core/json/impl/JsonUtil.java

@@ -11,7 +11,6 @@
 package io.vertx.core.json.impl;
 
 import io.vertx.core.buffer.Buffer;
-import io.vertx.core.impl.SysProps;
 import io.vertx.core.json.JsonArray;
 import io.vertx.core.json.JsonObject;
 import io.vertx.core.shareddata.Shareable;
@@ -32,23 +31,8 @@
  */
 public final class JsonUtil {
 
-  public static final Base64.Encoder BASE64_ENCODER;
-  public static final Base64.Decoder BASE64_DECODER;
-
-  static {
-    /*
-     * Vert.x 3.x Json supports RFC-7493, however the JSON encoder/decoder format was incorrect.
-     * Users who might need to interop with Vert.x 3.x applications should set the system property
-     * {@code vertx.json.base64} to {@code legacy}.
-     */
-    if ("legacy".equalsIgnoreCase(SysProps.JSON_BASE_64.get())) {
-      BASE64_ENCODER = Base64.getEncoder();
-      BASE64_DECODER = Base64.getDecoder();
-    } else {
-      BASE64_ENCODER = Base64.getUrlEncoder().withoutPadding();
-      BASE64_DECODER = Base64.getUrlDecoder();
-    }
-  }
+  public static final Base64.Encoder BASE64_ENCODER = Base64.getUrlEncoder().withoutPadding();
+  public static final Base64.Decoder BASE64_DECODER = Base64.getUrlDecoder();
 
   /**
    * Wraps well known java types to adhere to the Json expected types.