io.vertx.core.json.DecodeException: Mapping java.util.Map is not available without Jackson Databind on the classpath

[manjun...@gmail.com]

Hi,

After migrating to vertx 4.0.3 I am getting the below error even after adding the jackson-databind dependency entry in pom.xml. Please help

io.vertx.core.json.DecodeException: Mapping java.util.Map  is not available without Jackson Databind on the classpath

at io.vertx.core.json.jackson.JacksonCodec.fromValue(JacksonCodec.java:83)

at io.vertx.core.json.JsonObject.mapFrom(JsonObject.java:107)

at com.fe.entity.BaseDataEntity.toJson(BaseDataEntity.java:16)

Thanks,

Manjunath

[JEREMY FLORTE]

Hi,

Same issue when using when using  jackson dependencies versionned 2.12.X. I did not investigate further but it works fine with versions 2.11.4 (jacskon core and databind) and vertx 4+.

'hope it helps.

Regards,

Jérémy

[hantsy bai]

I think there are some breaking changes introduced in Jackson 2.12, lots of framework/deps will be problematic when upgrading to  2.12.

I reported this issue before https://github.com/vert-x3/vertx-web/issues/1841

Hantsy Bai

Self-employed consultant, fullstack developer, agile coach

GitHub: https://github.com/hantsy

Twitter: https://twitter.com/@hantsy

Medium: https://medium.com/@hantsy

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[manjun...@gmail.com]

Hi Jeremy/Hantsy,

Thanks for your response. I just got it working with jackson-databind 2.12.2. 

I just changed the order of my dependency in pom.xml. I moved  jackson-databind before vertx-core and everything went perfect. This does not seems right.

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.2</version>
</dependency>
<dependency>
<groupId>io.vertx</groupId>
<artifactId>vertx-core</artifactId>
<version>4.0.3</version>
</dependency>