NoSuchMethodError using fasterxml jackson - spring-4

Question

I am getting this error when running a spring application and using a RestTemplate
However when running a junit test I see no problem
In my test I generate this json.
[
{
"idProcesoElectoral": 9,
"idSolicitud": 591,
"folioSiilnere": "E1009000591",
"idEstatusSolicitud": 2,
"fechaEstatus": "25/10/17 13:13:51"
}
]
The error:
java.lang.NoSuchMethodError: com.fasterxml.jackson.databind.ObjectWriter.forType(Lcom/fasterxml/jackson/databind/JavaType;)Lcom/fasterxml/jackson/databind/ObjectWriter;
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:264)
at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:100)
at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:830)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:617)
at org.springframework.security.oauth2.client.OAuth2RestTemplate.doExecute(OAuth2RestTemplate.java:128)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:580)
at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:380)
I have read that it is probably a version conflict somewhere, but can't find the culprit.
Here are the jackson libraries included
./siilnere-web/target/siilnere-web-6.4.1.0.5/WEB-INF/lib/jackson-datatype-jsr310-2.2.3-beta5.jar
./siilnere-web/target/siilnere-web-6.4.1.0.5/WEB-INF/lib/jackson-annotations-2.8.9.jar
./siilnere-web/target/siilnere-web-6.4.1.0.5/WEB-INF/lib/jackson-databind-2.8.9.jar
./siilnere-web/target/siilnere-web-6.4.1.0.5/WEB-INF/lib/jackson-core-2.8.9.jar
./siilnere-ear/target/siilnere-ear-6.4.1.0.5/APP-INF/lib/jackson-datatype-jsr310-2.2.3-beta5.jar
./siilnere-ear/target/siilnere-ear-6.4.1.0.5/APP-INF/lib/jackson-core-asl-1.9.13.jar
./siilnere-ear/target/siilnere-ear-6.4.1.0.5/APP-INF/lib/jackson-mapper-asl-1.9.13.jar
./siilnere-ear/target/siilnere-ear-6.4.1.0.5/APP-INF/lib/jackson-annotations-2.8.9.jar
./siilnere-ear/target/siilnere-ear-6.4.1.0.5/APP-INF/lib/jackson-databind-2.8.9.jar
./siilnere-ear/target/siilnere-ear-6.4.1.0.5/APP-INF/lib/jackson-core-2.8.9.jar
Any help is appreciated.
Thankyou
Edit:
I read a suggestion to temporarily use java parameter -verbose:class to try to debug this.
I greped the output of weblogic and got this
and found statements like this (though I didn't find any like refering to class ObjectWriter):
Loaded com.fasterxml.jackson.databind.deser.std.StringDeserializer from file:/opt/Oracle/Oracle/Middleware/Oracle_Home/oracle_common/modules/com.fasterxml.jackson.core.jackson-databind.jar
However I have this in weblogic.xml:
<container-descriptor>
<prefer-web-inf-classes>false</prefer-web-inf-classes>
<prefer-application-packages>
<package-name>com.fasterxml</package-name>
</prefer-application-packages>
</container-descriptor>