[BT-5096] Refactor client exceptions.

src/main/java/com/fauna/client/FaunaClient.java

@@ -5,6 +5,7 @@
 import com.fauna.codec.DefaultCodecProvider;
 import com.fauna.codec.DefaultCodecRegistry;
 import com.fauna.exception.ClientException;
+import com.fauna.exception.ClientRequestException;
 import com.fauna.exception.FaunaException;
 import com.fauna.query.QueryOptions;
 import com.fauna.stream.StreamRequest;

src/main/java/com/fauna/client/RequestBuilder.java

@@ -6,6 +6,7 @@
 import com.fauna.codec.CodecProvider;
 import com.fauna.env.DriverEnvironment;
 import com.fauna.exception.ClientException;
+import com.fauna.exception.ClientRequestException;
 import com.fauna.query.QueryOptions;
 import com.fauna.stream.StreamRequest;
 import com.fauna.query.builder.Query;
@@ -98,17 +99,14 @@ public HttpRequest buildRequest(Query fql, QueryOptions options, CodecProvider p
             addOptionalHeaders(builder, options);
         }
         // TODO: set last-txn-ts and max-contention-retries.
-        try {
-            UTF8FaunaGenerator gen = new UTF8FaunaGenerator();
+        try (UTF8FaunaGenerator gen = UTF8FaunaGenerator.create()) {
             gen.writeStartObject();
             gen.writeFieldName(FieldNames.QUERY);
             Codec<Query> codec = provider.get(Query.class);
             codec.encode(gen, fql);
             gen.writeEndObject();
             String body = gen.serialize();
             return builder.POST(HttpRequest.BodyPublishers.ofString(body)).build();
-        } catch (IOException e) {
-            throw new ClientException("Unable to build Fauna Query request.", e);
         }
     }
 

src/main/java/com/fauna/codec/Codec.java

@@ -1,12 +1,12 @@
 package com.fauna.codec;
 
-import java.io.IOException;
+import com.fauna.exception.CodecException;
 
 
 public interface Codec<T> {
 
-    T decode(UTF8FaunaParser parser) throws IOException;
-    void encode(UTF8FaunaGenerator gen, T obj) throws IOException;
+    T decode(UTF8FaunaParser parser) throws CodecException;
+    void encode(UTF8FaunaGenerator gen, T obj) throws CodecException;
     Class<?> getCodecClass();
 
     FaunaType[] getSupportedTypes();