No serializer found for class com.atlassian.jira.issue.security.IssueSecurityLevelImpl issue

[Dishant Sharma]

I am creating a Jira software server plugin for v7.13.0. I am creating an API to get all the issue security levels of a user. 

My code for the same is as follows:

    UserManager userManager = ComponentAccessor.getComponentOfType(UserManager.class);


    @GET
    @Produces({MediaType.APPLICATION_JSON})
    @Path("user-security-levels")
    public Response getUserSecurityLevels(@QueryParam("user") String user) {
        log.error("entering getSecurityLevels function");
        log.error("name of the user: " + user);

        ApplicationUser targetUser = userManager.getUserByName(user);
        log.error("value of targetUser: " + targetUser);

        IssueSecurityLevelManager issueSecurityLevelManager = ComponentAccessor.getComponentOfType(IssueSecurityLevelManager.class);

        Collection<IssueSecurityLevel> securityLevelsOfUser = issueSecurityLevelManager.getAllSecurityLevelsForUser(targetUser);
        log.error("user security levels: " + securityLevelsOfUser);

        return securityLevelsOfUser == null ? Response.status(Response.Status.NOT_FOUND)
                .build() : Response.ok(securityLevelsOfUser).build();

    }

But, this code is not working and is giving the following error:

2022-10-27 16:00:35,623 http-nio-8080-exec-13 ERROR      [o.a.c.c.C.[.[localhost].[/].[default]] Servlet.service() for servlet [default] in context with path [] threw exception

org.codehaus.jackson.map.JsonMappingException: No serializer found for class com.atlassian.jira.issue.security.IssueSecurityLevelImpl and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashSet[0])

Can anyone please help me to fix this issue?