Demo code to show how to force the use of Jackson 2.x with Jersesy 2.x.
The repository contains 2 Web applications that implements a simple REST service with a single resource "/datedemo".
The resource has a "Date" field customized with Jackson @JsonFormat annotation.
This resource would return a JSON object like this:
{
"date": "30/06/2023",
"calendar": 1688139526184,
"gregorianCalendar": 1688139526184,
"timeZone": "Europe/Rome"
}Note: following result would be WRONG and means that JacksonFeature is not loaded and @JsonFormat annotation is not working, and this was happening intermittently on app restart:
{
"date": 1688139881752,
"calendar": 1688139881752,
"gregorianCalendar": 1688139881752,
"timeZone": "Europe/Rome"
}The code here demostrate how setting the property jersey.config.jsonFeature to JacksonJsonProvider, would always force the use of Jackson over Yasson and makes @JsonFormat to always work.
This application sets jersey.config.jsonFeature programmatically in JaxRsWithJacksonResourceConfig, a Jersey configuration class that extends org.glassfish.jersey.server.ResourceConfig:
register(JacksonFeature.class);
register(JacksonJsonProvider.class);
register(DateDemoService.class);
property("jersey.config.jsonFeature", "JacksonJsonProvider");Test endpoint is: http://{{SERVER}}:{{PORT}}/recordrest-app-jackson/resources2/datedemo
This application sets jersey.config.jsonFeature in web.xml while defying the jax-rs service configuration:
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<servlet>
<servlet-name>JaxRsWithJacksonWebApplication</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>it.fl.poc.jsondatejackson.rest</param-value>
</init-param>
<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>org.glassfish.jersey.jackson.JacksonFeature,com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider</param-value>
</init-param>
<init-param>
<param-name>jersey.config.jsonFeature</param-name>
<param-value>JacksonJsonProvider</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>JaxRsWithJacksonWebApplication</servlet-name>
<url-pattern>/resources3/*</url-pattern>
</servlet-mapping>
</web-app>Test endpoint is: http://{{SERVER}}:{{PORT}}/recordrest-web-jackson/resources3/datedemo
Build with usual
$ mvn package
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