WebClient create java.lang.ExceptionInInitializerError: null ExchangeStrategies.withDefaults - spring

Question

I'm trying to play around Spring WebFlux Webclient.
Tried to create a simple webclient in a quartz cron job
this.webClient = WebClient.create(this.queryUrl);
I made sure the queryUrl is valid.
However, I've got an error as following:
java.lang.ExceptionInInitializerError: null
at org.springframework.web.reactive.function.client.ExchangeStrategies.withDefaults(ExchangeStrategies.java:67)
at org.springframework.web.reactive.function.client.DefaultWebClientBuilder.initExchangeStrategies(DefaultWebClientBuilder.java:302)
at org.springframework.web.reactive.function.client.DefaultWebClientBuilder.build(DefaultWebClientBuilder.java:269)
at org.springframework.web.reactive.function.client.WebClient.create(WebClient.java:154)
Tracing into the code, I've found that
DefaultExchangeStrategiesBuilder is null.
Does anyone have any idea what is missing?
It's a simple web client.
Thanks.

Answer 1

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.13.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.13.0</version>
</dependency>
Adding these dependencies and making sure the versions are the same.
I only had jackson-core before.
I tried to move the job out of quartz and ran it directly in main.
it still threw an exception, but it's different and I then looked it up
and some one has asked the issue and the solution to make sure both jackson packages need to be included and versions must be same.
I then added them to the pom file. try to run the job and it worked.
Putting the job back to quartz to run and it also worked.