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

Question

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])