Repository: strimzi/strimzi-kafka-bridge (java)

Issue:
Add a new `string` embedded format
Currently, we have the `binary` and `json` embedded format.
The JSON one is used for handling messages key and message as JSON, while the binary one allows to set them a Base64 encoded String from corresponding binary data.
As per #410, users need to transfer key and value which are simple raw strings and not JSON strings, so without quotes.
This is not possible with the `json` embedded format because it's not simple detect that a key or value is a simple String or just a malformed JSON (see #737 for more details).
Using the `binary` mode to transfer simple strings works but it's an hack.

In order to allow the simple strings use case, we could add a new `string` embedded format in the bridge.

Pull request description:
feat: added a new text embedded format
This fixes #739 

Note: I closed #836 and started a fresh PR.

Patch:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbab2fd..4c28b3d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 * Dependency updates (Kafka 3.7.0, Kubernetes configuration provider 1.1.2, Vert.x 4.5.4, Netty 4.1.107.Final, Jackson FasterXML 2.16.1, Micrometer 1.12.3)
 * Fixed missing messaging semantic attributes to the Kafka consumer spans
+* Introduced a new text embedded format to send and receive plain strings for record key and value.
 
 ## 0.27.0
 
diff --git a/documentation/book/api/paths.adoc b/documentation/book/api/paths.adoc
index 501e7fa..d6be235 100644
--- a/documentation/book/api/paths.adoc
+++ b/documentation/book/api/paths.adoc
@@ -616,6 +616,7 @@ __optional__|The maximum amount of time, in milliseconds, that the HTTP Bridge s
 
 * `application/vnd.kafka.json.v2+json`
 * `application/vnd.kafka.binary.v2+json`
+* `application/vnd.kafka.text.v2+json`
 * `application/vnd.kafka.v2+json`
 
 
@@ -1046,6 +1047,7 @@ __required__||<<_producerrecordlist,ProducerRecordList>>
 
 * `application/vnd.kafka.json.v2+json`
 * `application/vnd.kafka.binary.v2+json`
+* `application/vnd.kafka.text.v2+json`
 
 
 ==== Produces
@@ -1312,6 +1314,7 @@ __required__|List of records to send to a given topic partition, including a val
 
 * `application/vnd.kafka.json.v2+json`
 * `application/vnd.kafka.binary.v2+json`
+* `application/vnd.kafka.text.v2+json`
 
 
 ==== Produces
diff --git a/documentation/modules/con-requests-kafka-bridge.adoc b/documentation/modules/con-requests-kafka-bridge.adoc
index 40b6055..6304900 100644
--- a/documentation/modules/con-requests-kafka-bridge.adoc
+++ b/documentation/modules/con-requests-kafka-bridge.adoc
@@ -19,7 +19,7 @@ API request and response bodies are always encoded as JSON.
 Content-Type: application/vnd.kafka.v2+json
 ----
 
-* When performing producer operations, `POST` requests must provide `Content-Type` headers specifying the _embedded data format_ of the messages produced. This can be either `json` or `binary`.
+* When performing producer operations, `POST` requests must provide `Content-Type` headers specifying the _embedded data format_ of the messages produced. This can be either `json`, `binary` or `text`.
 +
 [cols="35,65",options="header",stripes="none",separator=¦]
 |===
@@ -33,6 +33,9 @@ m¦Content-Type: application/vnd.kafka.json.v2+json
 ¦Binary
 m¦Content-Type: application/vnd.kafka.binary.v2+json
 
+¦Text
+m¦Content-Type: application/vnd.kafka.text.v2+json
+
 |===
 
 The embedded data format is set per consumer, as described in the next section.
@@ -42,9 +45,9 @@ An empty body can be used to create a consumer with the default values.
 
 == Embedded data format
 
-The embedded data format is the format of the Kafka messages that are transmitted, over HTTP, from a producer to a consumer using the Kafka Bridge. Two embedded data formats are supported: JSON and binary.
+The embedded data format is the format of the Kafka messages that are transmitted, over HTTP, from a producer to a consumer using the Kafka Bridge. Three embedded data formats are supported: JSON, binary and text.
 
-When creating a consumer using the `/consumers/_groupid_` endpoint, the `POST` request body must specify an embedded data format of either JSON or binary. This is specified in the `format` field, for example:
+When creating a consumer using the `/consumers/_groupid_` endpoint, the `POST` request body must specify an embedded data format of either JSON, binary or text. This is specified in the `format` field, for example:
 
 [source,json,subs="attributes+"]
 ----
@@ -109,6 +112,8 @@ curl -X POST \
 ----
 <1> The header value in binary format and encoded as Base64.
 
+Please note that if your consumer is configured to use the text embedded data format, the `value` and `key` field in the `records` parameter must be a string and not a JSON object.
+
 == Accept headers
 
 After creating a consumer, all subsequent GET requests must provide an `Accept` header in the following format:
@@ -118,7 +123,7 @@ After creating a consumer, all subsequent GET requests must provide an `Accept`
 Accept: application/vnd.kafka._EMBEDDED-DATA-FORMAT_.v2+json
 ----
 
-The `EMBEDDED-DATA-FORMAT` is either `json` or `binary`.
+The `EMBEDDED-DATA-FORMAT` is either `json`, `binary` or `text`.
 
 For example, when retrieving records for a subscribed consumer using an embedded data format of JSON, include this Accept header:
 
diff --git a/src/main/java/io/strimzi/kafka/bridge/BridgeContentType.java b/src/main/java/io/strimzi/kafka/bridge/BridgeContentType.java
index 39fe201..f436c94 100644
--- a/src/main/java/io/strimzi/kafka/bridge/BridgeContentType.java
+++ b/src/main/java/io/strimzi/kafka/bridge/BridgeContentType.java
@@ -16,6 +16,9 @@ public class BridgeContentType {
     /** JSON encoding with BINARY embedded format */
     public static final String KAFKA_JSON_BINARY = "application/vnd.kafka.binary.v2+json";
 
+    /** JSON encoding with TEXT embedded format */
+    public static final String KAFKA_JSON_TEXT = "application/vnd.kafka.text.v2+json";
+
     /** Specific Kafka JSON encoding */
     public static final String KAFKA_JSON = "application/vnd.kafka.v2+json";
 
diff --git a/src/main/java/io/strimzi/kafka/bridge/EmbeddedFormat.java b/src/main/java/io/strimzi/kafka/bridge/EmbeddedFormat.java
index 680b86d..16de02d 100644
--- a/src/main/java/io/strimzi/kafka/bridge/EmbeddedFormat.java
+++ b/src/main/java/io/strimzi/kafka/bridge/EmbeddedFormat.java
@@ -14,7 +14,10 @@ public enum EmbeddedFormat {
     BINARY,
 
     /** Define "json" data as embedded format */
-    JSON;
+    JSON,
+
+    /** Define "text" data as embedded format */
+    TEXT;
 
     /**
      * Convert the String value in the corresponding enum
@@ -28,6 +31,8 @@ public enum EmbeddedFormat {
                 return JSON;
             case "binary":
                 return BINARY;
+            case "text":
+                return TEXT;
         }
         throw new IllegalEmbeddedFormatException("Invalid format type.");
     }
diff --git a/src/main/java/io/strimzi/kafka/bridge/http/HttpBridge.java b/src/main/java/io/strimzi/kafka/bridge/http/HttpBridge.java
index 77cbe93..733a92a 100644
--- a/src/main/java/io/strimzi/kafka/bridge/http/HttpBridge.java
+++ b/src/main/java/io/strimzi/kafka/bridge/http/HttpBridge.java
@@ -638,6 +638,8 @@ public class HttpBridge extends AbstractVerticle {
                 return EmbeddedFormat.BINARY;
             case BridgeContentType.KAFKA_JSON_JSON:
                 return EmbeddedFormat.JSON;
+            case BridgeContentType.KAFKA_JSON_TEXT:
+                return EmbeddedFormat.TEXT;
         }
         throw new IllegalArgumentException(contentType);
     }
diff --git a/src/main/java/io/strimzi/kafka/bridge/http/HttpSinkBridgeEndpoint.java b/src/main/java/io/strimzi/kafka/bridge/http/HttpSinkBridgeEndpoint.java
index 6c97ad4..b54cb0e 100644
--- a/src/main/java/io/strimzi/kafka/bridge/http/HttpSinkBridgeEndpoint.java
+++ b/src/main/java/io/strimzi/kafka/bridge/http/HttpSinkBridgeEndpoint.java
@@ -20,6 +20,7 @@ import io.strimzi.kafka.bridge.config.BridgeConfig;
 import io.strimzi.kafka.bridge.converter.MessageConverter;
 import io.strimzi.kafka.bridge.http.converter.HttpBinaryMessageConverter;
 import io.strimzi.kafka.bridge.http.converter.HttpJsonMessageConverter;
+import io.strimzi.kafka.bridge.http.converter.HttpTextMessageConverter;
 import io.strimzi.kafka.bridge.http.converter.JsonDecodeException;
 import io.strimzi.kafka.bridge.http.converter.JsonUtils;
 import io.strimzi.kafka.bridge.http.model.HttpBridgeError;
@@ -305,9 +306,8 @@ public class HttpSinkBridgeEndpoint<K, V> extends HttpBridgeEndpoint {
                             BridgeContentType.KAFKA_JSON, JsonUtils.jsonToBytes(error.toJson()));
                 } else {
                     responseStatus = HttpResponseStatus.OK;
-                    HttpUtils.sendResponse(routingContext, responseStatus.code(),
-                            this.format == EmbeddedFormat.BINARY ? BridgeContentType.KAFKA_JSON_BINARY : BridgeContentType.KAFKA_JSON_JSON,
-                            buffer);
+
+                    HttpUtils.sendResponse(routingContext, responseStatus.code(), getContentType(), buffer);
                 }
             } catch (JsonDecodeException e) {
                 LOGGER.error("Error decoding records as JSON", e);
@@ -614,16 +614,32 @@ public class HttpSinkBridgeEndpoint<K, V> extends HttpBridgeEndpoint {
                 return (MessageConverter<K, V, byte[], byte[]>) new HttpJsonMessageConverter();
             case BINARY:
                 return (MessageConverter<K, V, byte[], byte[]>) new HttpBinaryMessageConverter();
+            case TEXT:
+                return (MessageConverter<K, V, byte[], byte[]>) new HttpTextMessageConverter();
         }
         return null;
     }
 
+    private String getContentType() {
+        switch (this.format) {
+            case JSON:
+                return BridgeContentType.KAFKA_JSON_JSON;
+            case BINARY:
+                return BridgeContentType.KAFKA_JSON_BINARY;
+            case TEXT:
+                return BridgeContentType.KAFKA_JSON_TEXT;
+        }
+        throw new IllegalArgumentException();
+    }
+
     private boolean checkAcceptedBody(String accept) {
         switch (accept) {
             case BridgeContentType.KAFKA_JSON_JSON:
                 return format == EmbeddedFormat.JSON;
             case BridgeContentType.KAFKA_JSON_BINARY:
                 return format == EmbeddedFormat.BINARY;
+            case BridgeContentType.KAFKA_JSON_TEXT:
+                return format == EmbeddedFormat.TEXT;
         }
         return false;
     }
diff --git a/src/main/java/io/strimzi/kafka/bridge/http/HttpSourceBridgeEndpoint.java b/src/main/java/io/strimzi/kafka/bridge/http/HttpSourceBridgeEndpoint.java
index 49282f3..e75196c 100644
--- a/src/main/java/io/strimzi/kafka/bridge/http/HttpSourceBridgeEndpoint.java
+++ b/src/main/java/io/strimzi/kafka/bridge/http/HttpSourceBridgeEndpoint.java
@@ -16,6 +16,7 @@ import io.strimzi.kafka.bridge.config.BridgeConfig;
 import io.strimzi.kafka.bridge.converter.MessageConverter;
 import io.strimzi.kafka.bridge.http.converter.HttpBinaryMessageConverter;
 import io.strimzi.kafka.bridge.http.converter.HttpJsonMessageConverter;
+import io.strimzi.kafka.bridge.http.converter.HttpTextMessageConverter;
 import io.strimzi.kafka.bridge.http.converter.JsonUtils;
 import io.strimzi.kafka.bridge.http.model.HttpBridgeError;
 import io.strimzi.kafka.bridge.http.model.HttpBridgeResult;
@@ -228,6 +229,8 @@ public class HttpSourceBridgeEndpoint<K, V> extends HttpBridgeEndpoint {
                 return (MessageConverter<K, V, byte[], byte[]>) new HttpJsonMessageConverter();
             case BridgeContentType.KAFKA_JSON_BINARY:
                 return (MessageConverter<K, V, byte[], byte[]>) new HttpBinaryMessageConverter();
+            case BridgeContentType.KAFKA_JSON_TEXT:
+                return (MessageConverter<K, V, byte[], byte[]>) new HttpTextMessageConverter();
         }
         return null;
     }
diff --git a/src/main/java/io/strimzi/kafka/bridge/http/converter/HttpTextMessageConverter.java b/src/main/java/io/strimzi/kafka/bridge/http/converter/HttpTextMessageConverter.java
new file mode 100644
index 0000000..7041901
--- /dev/null
+++ b/src/main/java/io/strimzi/kafka/bridge/http/converter/HttpTextMessageConverter.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright Strimzi authors.
+ * License: Apache License 2.0 (see the file LICENSE or http://apache.org/licenses/LICENSE-2.0.html).
+ */
+package io.strimzi.kafka.bridge.http.converter;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.databind.node.TextNode;
+import io.strimzi.kafka.bridge.converter.MessageConverter;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.common.header.Header;
+import org.apache.kafka.common.header.Headers;
+import org.apache.kafka.common.header.internals.RecordHeader;
+import org.apache.kafka.common.header.internals.RecordHeaders;
+
+import javax.xml.bind.DatatypeConverter;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Implementation of a message converter to deal with the "text" embedded data format
+ */
+@SuppressWarnings("checkstyle:NPathComplexity")
+public class HttpTextMessageConverter implements MessageConverter<byte[], byte[], byte[], byte[]> {
+    @Override
+    public ProducerRecord<byte[], byte[]> toKafkaRecord(String kafkaTopic, Integer partition, byte[] message) {
+
+        Integer partitionFromBody = null;
+        byte[] key = null;
+        byte[] value = null;
+        Headers headers = new RecordHeaders();
+
+        JsonNode json = JsonUtils.bytesToJson(message);
+
+        if (!json.isEmpty()) {
+            if (json.has("key")) {
+                key = json.get("key").asText().getBytes();
+            }
+            if (json.has("value")) {
+                JsonNode valueNode = json.get("value");
+                if (!valueNode.isTextual()) {
+                    throw new IllegalStateException("Because the embedded format is 'text', the value must be a string");
+                }
+                value = valueNode.asText().getBytes();
+            }
+            if (json.has("headers")) {
+                ArrayNode jsonArray = (ArrayNode) json.get("headers");
+                for (JsonNode jsonObject : jsonArray) {
+                    headers.add(new RecordHeader(jsonObject.get("key").asText(), DatatypeConverter.parseBase64Binary(jsonObject.get("value").asText())));
+                }
+            }
+            if (json.has("partition")) {
+                partitionFromBody = json.get("partition").asInt();
+            }
+            if (partition != null && partitionFromBody != null) {
+                throw new IllegalStateException("Partition specified in body and in request path");
+            }
+            if (partition != null) {
+                partitionFromBody = partition;
+            }
+        }
+        return new ProducerRecord<>(kafkaTopic, partitionFromBody, key, value, headers);
+    }
+
+    @Override
+    public List<ProducerRecord<byte[], byte[]>> toKafkaRecords(String kafkaTopic, Integer partition, byte[] messages) {
+
+        List<ProducerRecord<byte[], byte[]>> records = new ArrayList<>();
+
+        JsonNode json = JsonUtils.bytesToJson(messages);
+        ArrayNode jsonArray = (ArrayNode) json.get("records");
+
+        for (JsonNode jsonObj : jsonArray) {
+            records.add(toKafkaRecord(kafkaTopic, partition, JsonUtils.jsonToBytes(jsonObj)));
+        }
+        return records;
+    }
+
+    @Override
+    public byte[] toMessage(String address, ConsumerRecord<byte[], byte[]> record) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public byte[] toMessages(ConsumerRecords<byte[], byte[]> records) {
+        ArrayNode jsonArray = JsonUtils.createArrayNode();
+
+        for (ConsumerRecord<byte[], byte[]> record : records) {
+            ObjectNode jsonObject = JsonUtils.createObjectNode();
+
+            jsonObject.set("topic", new TextNode(record.topic()));
+            jsonObject.set("key", record.key() != null ? new TextNode(new String(record.key())) : null);
+            jsonObject.set("value", record.value() != null ? new TextNode(new String(record.value())) : null);
+            jsonObject.put("partition", record.partition());
+            jsonObject.put("offset", record.offset());
+
+            ArrayNode headers = JsonUtils.createArrayNode();
+
+            for (Header kafkaHeader : record.headers()) {
+                ObjectNode header = JsonUtils.createObjectNode();
+
+                header.set("key", new TextNode(kafkaHeader.key()));
+                header.put("value", DatatypeConverter.printBase64Binary(kafkaHeader.value()));
+                headers.add(header);
+            }
+            if (!headers.isEmpty()) {
+                jsonObject.set("headers", headers);
+            }
+            jsonArray.add(jsonObject);
+        }
+        return JsonUtils.jsonToBytes(jsonArray);
+    }
+}
\ No newline at end of file
diff --git a/src/main/resources/openapi.json b/src/main/resources/openapi.json
index f6a0862..696e67f 100644
--- a/src/main/resources/openapi.json
+++ b/src/main/resources/openapi.json
@@ -652,6 +652,11 @@
                             "schema": {
                                 "$ref": "#/components/schemas/ProducerRecordList"
                             }
+                        },
+                        "application/vnd.kafka.text.v2+json": {
+                            "schema": {
+                                "$ref": "#/components/schemas/ProducerRecordList"
+                            }
                         }
                     },
                     "required": true
@@ -799,6 +804,11 @@
                                     }
                                 }
                             },
+                            "application/vnd.kafka.text.v2+json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/ConsumerRecordList"
+                                }
+                            },
                             "application/vnd.kafka.v2+json": {
                                 "schema": {
                                     "$ref": "#/components/schemas/ConsumerRecordList"
@@ -819,6 +829,11 @@
                                     "$ref": "#/components/schemas/Error"
                                 }
                             },
+                            "application/vnd.kafka.text.v2+json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/Error"
+                                }
+                            },
                             "application/vnd.kafka.v2+json": {
                                 "schema": {
                                     "$ref": "#/components/schemas/Error"
@@ -847,6 +862,11 @@
                                     "$ref": "#/components/schemas/Error"
                                 }
                             },
+                            "application/vnd.kafka.text.v2+json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/Error"
+                                }
+                            },
                             "application/vnd.kafka.v2+json": {
                                 "schema": {
                                     "$ref": "#/components/schemas/Error"
@@ -875,6 +895,11 @@
                                     "$ref": "#/components/schemas/Error"
                                 }
                             },
+                            "application/vnd.kafka.text.v2+json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/Error"
+                                }
+                            },
                             "application/vnd.kafka.v2+json": {
                                 "schema": {
                                     "$ref": "#/components/schemas/Error"
@@ -1041,6 +1066,11 @@
                             "schema": {
                                 "$ref": "#/components/schemas/ProducerRecordToPartitionList"
                             }
+                        },
+                        "application/vnd.kafka.text.v2+json": {
+                            "schema": {
+                                "$ref": "#/components/schemas/ProducerRecordToPartitionList"
+                            }
                         }
                     },
                     "required": true
diff --git a/src/main/resources/openapiv2.json b/src/main/resources/openapiv2.json
index 39d59ad..f9a3e7f 100644
--- a/src/main/resources/openapiv2.json
+++ b/src/main/resources/openapiv2.json
@@ -602,7 +602,8 @@
         "operationId": "send",
         "consumes": [
           "application/vnd.kafka.json.v2+json",
-          "application/vnd.kafka.binary.v2+json"
+          "application/vnd.kafka.binary.v2+json",
+          "application/vnd.kafka.text.v2+json"
         ],
         "produces": [
           "application/vnd.kafka.v2+json"
@@ -695,6 +696,7 @@
         "produces": [
           "application/vnd.kafka.json.v2+json",
           "application/vnd.kafka.binary.v2+json",
+          "application/vnd.kafka.text.v2+json",
           "application/vnd.kafka.v2+json"
         ],
         "responses": {
@@ -935,7 +937,8 @@
         "operationId": "sendToPartition",
         "consumes": [
           "application/vnd.kafka.json.v2+json",
-          "application/vnd.kafka.binary.v2+json"
+          "application/vnd.kafka.binary.v2+json",
+          "application/vnd.kafka.text.v2+json"
         ],
         "produces": [
           "application/vnd.kafka.v2+json"


Test patch:
diff --git a/src/test/java/io/strimzi/kafka/bridge/http/ConsumerIT.java b/src/test/java/io/strimzi/kafka/bridge/http/ConsumerIT.java
index 91cb14e..1bd287e 100644
--- a/src/test/java/io/strimzi/kafka/bridge/http/ConsumerIT.java
+++ b/src/test/java/io/strimzi/kafka/bridge/http/ConsumerIT.java
@@ -533,6 +533,60 @@ public class ConsumerIT extends HttpBridgeITAbstract {
         assertThat(context.awaitCompletion(TEST_TIMEOUT, TimeUnit.SECONDS), is(true));
     }
 
+    @Test
+    void receiveTextMessage(VertxTestContext context) throws InterruptedException, ExecutionException, TimeoutException {
+        KafkaFuture<Void> future = adminClientFacade.createTopic(topic);
+
+        future.get();
+        String sentBody = "Simple message";
+        basicKafkaClient.sendStringMessagesPlain(topic, sentBody, 1, 0, true);
+
+        JsonObject json = new JsonObject();
+        json.put("name", name);
+        json.put("format", "text");
+
+        // create consumer
+        // subscribe to a topic
+        consumerService()
+                .createConsumer(context, groupId, json)
+                .subscribeConsumer(context, groupId, name, topic);
+
+        CompletableFuture<Boolean> consume = new CompletableFuture<>();
+        // consume records
+        consumerService()
+            .consumeRecordsRequest(groupId, name, BridgeContentType.KAFKA_JSON_TEXT)
+            .as(BodyCodec.jsonArray())
+            .send(ar -> {
+                context.verify(() -> {
+                    assertThat(ar.succeeded(), is(true));
+                    HttpResponse<JsonArray> response = ar.result();
+                    assertThat(response.statusCode(), is(HttpResponseStatus.OK.code()));
+                    JsonObject jsonResponse = response.body().getJsonObject(0);
+
+                    String kafkaTopic = jsonResponse.getString("topic");
+                    int kafkaPartition = jsonResponse.getInteger("partition");
+                    String key = jsonResponse.getString("key");
+                    String value = jsonResponse.getString("value");
+                    long offset = jsonResponse.getLong("offset");
+
+                    assertThat(kafkaTopic, is(topic));
+                    assertThat(value, is(sentBody));
+                    assertThat(offset, is(0L));
+                    assertThat(kafkaPartition, notNullValue());
+                    assertThat(key, nullValue());
+                });
+                consume.complete(true);
+            });
+
+        consume.get(TEST_TIMEOUT, TimeUnit.SECONDS);
+
+        // consumer deletion
+        consumerService()
+            .deleteConsumer(context, groupId, name);
+        context.completeNow();
+        assertThat(context.awaitCompletion(TEST_TIMEOUT, TimeUnit.SECONDS), is(true));
+    }
+
     @Test
     void receiveSimpleMessageWithHeaders(VertxTestContext context) throws InterruptedException, ExecutionException, TimeoutException {
         KafkaFuture<Void> future = adminClientFacade.createTopic(topic, 1, 1);
diff --git a/src/test/java/io/strimzi/kafka/bridge/http/ProducerIT.java b/src/test/java/io/strimzi/kafka/bridge/http/ProducerIT.java
index 0fb49a8..3bc22e7 100644
--- a/src/test/java/io/strimzi/kafka/bridge/http/ProducerIT.java
+++ b/src/test/java/io/strimzi/kafka/bridge/http/ProducerIT.java
@@ -244,6 +244,53 @@ public class ProducerIT extends HttpBridgeITAbstract {
         });
     }
 
+    @Test
+    void sendTextMessage(VertxTestContext context) throws InterruptedException, ExecutionException {
+        KafkaFuture<Void> future = adminClientFacade.createTopic(topic);
+
+        String value = "message-value";
+
+        JsonArray records = new JsonArray();
+        JsonObject json = new JsonObject();
+        json.put("value", value);
+        records.add(json);
+
+        JsonObject root = new JsonObject();
+        root.put("records", records);
+
+        future.get();
+
+        producerService()
+                .sendRecordsRequest(topic, root, BridgeContentType.KAFKA_JSON_TEXT)
+                .sendJsonObject(root, verifyOK(context));
+
+        Properties consumerProperties = Consumer.fillDefaultProperties();
+        consumerProperties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaUri);
+
+        KafkaConsumer<String, String> consumer = KafkaConsumer.create(vertx, consumerProperties,
+                new StringDeserializer(), new StringDeserializer());
+        consumer.handler(record -> {
+            context.verify(() -> {
+                assertThat(record.value(), is(value));
+                assertThat(record.topic(), is(topic));
+                assertThat(record.partition(), is(0));
+                assertThat(record.offset(), is(0L));
+                assertThat(record.key(), nullValue());
+            });
+            LOGGER.info("Message consumed topic={} partition={} offset={}, key={}, value={}",
+                    record.topic(), record.partition(), record.offset(), record.key(), record.value());
+            consumer.close();
+            context.completeNow();
+        });
+
+        consumer.subscribe(topic, done -> {
+            if (!done.succeeded()) {
+                context.failNow(done.cause());
+            }
+        });
+        assertThat(context.awaitCompletion(TEST_TIMEOUT, TimeUnit.SECONDS), is(true));
+    }
+
     @Test
     void sendSimpleMessageWithHeaders(VertxTestContext context) throws ExecutionException, InterruptedException {
         KafkaFuture<Void> future = adminClientFacade.createTopic(topic, 2, 1);
@@ -461,6 +508,38 @@ public class ProducerIT extends HttpBridgeITAbstract {
             });
     }
 
+    @Test
+    void sendTextMessageWithWrongValue(VertxTestContext context) throws InterruptedException, ExecutionException {
+        KafkaFuture<Void> future = adminClientFacade.createTopic(topic);
+
+        JsonObject value = new JsonObject().put("message", "Hi, This is kafka bridge");
+
+        JsonArray records = new JsonArray();
+        JsonObject json = new JsonObject();
+        json.put("value", value);
+        records.add(json);
+
+        JsonObject root = new JsonObject();
+        root.put("records", records);
+
+        future.get();
+
+        // produce and check the status code
+        producerService()
+                .sendRecordsRequest(topic, root, BridgeContentType.KAFKA_JSON_TEXT)
+                .sendJsonObject(root, ar -> {
+                    context.verify(() -> {
+                        assertThat(ar.succeeded(), is(true));
+                        HttpResponse<JsonObject> response = ar.result();
+                        HttpBridgeError error = HttpBridgeError.fromJson(response.body());
+                        assertThat(response.statusCode(), is(HttpResponseStatus.UNPROCESSABLE_ENTITY.code()));
+                        assertThat(error.getCode(), is(HttpResponseStatus.UNPROCESSABLE_ENTITY.code()));
+                        assertThat(error.getMessage(), is("Because the embedded format is 'text', the value must be a string"));
+                    });
+                    context.completeNow();
+                });
+    }
+
     @Test
     void sendMessageWithNullValueTest(VertxTestContext context) throws InterruptedException, ExecutionException {
         String topic = "sendMessageWithNullValueTest";