Fix/send poisonous messages to dlq (#15)

* Handle poisonous kafka messages

* Update to 1.0.7

README.md

@@ -10,11 +10,11 @@ This connector has not yet been published to Confluent Hub. To install it, downl
 install it using `confluent-hub` command line tool.
 
 ```sh
-wget https://github.com/vinted/kafka-connect-vespa/releases/download/v1.0.6/vinted-kafka-connect-vespa-1.0.6-SNAPSHOT.zip -O /tmp/vinted-kafka-connect-vespa-1.0.6-SNAPSHOT.zip -q
+wget https://github.com/vinted/kafka-connect-vespa/releases/download/v1.0.7/vinted-kafka-connect-vespa-1.0.7-SNAPSHOT.zip -O /tmp/vinted-kafka-connect-vespa-1.0.7-SNAPSHOT.zip -q
 ```
 
 ```sh
-confluent-hub install --no-prompt /tmp/vinted-kafka-connect-vespa-1.0.6-SNAPSHOT.zip
+confluent-hub install --no-prompt /tmp/vinted-kafka-connect-vespa-1.0.7-SNAPSHOT.zip
 ```
 
 ### Operational modes

pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.vinted.kafka.connect.vespa</groupId>
     <artifactId>kafka-connect-vespa</artifactId>
-    <version>1.0.6-SNAPSHOT</version>
+    <version>1.0.7-SNAPSHOT</version>
     <name>kafka-connect-vespa</name>
     <description>The Vespa Sink Connector is used to write data from Kafka to a Vespa search engine.</description>
     <url>https://github.com/vinted/kafka-connect-vespa</url>

src/main/java/com/vinted/kafka/connect/vespa/feeders/VespaFeederHandler.java

@@ -100,7 +100,10 @@ private static boolean isMalformed(Throwable throwable) {
                 .findFirst()
                 .orElse(throwable);
 
-        return rootCause.toString().toLowerCase().contains("status 400")
+        String rootCauseString = rootCause.toString().toLowerCase();
+
+        return rootCauseString.contains("status 400")
+                || rootCauseString.contains("string field value contains illegal code point")
                 || rootCause instanceof OperationParseException
                 || rootCause instanceof JsonParseException;
     }