JSON object and Spring @RequestParam

You should create a wrapper around your JSON structure in Java and pass it through to the controller as a @RequestBody. Here is what worked for me:

public class CampaignDTO {
    private String name;
    private BigDecimal budget;
    private Integer type;
    private Boolean dynamic;

    @JsonProperty("geo_target")
    private List<Integer> geoTarget;

    @JsonProperty("time_target")
    private TimeTarget timeTarget;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public BigDecimal getBudget() {
        return budget;
    }

    public void setBudget(BigDecimal budget) {
        this.budget = budget;
    }

    public Integer getType() {
        return type;
    }

    public void setType(Integer type) {
        this.type = type;
    }

    public Boolean getDynamic() {
        return dynamic;
    }

    public void setDynamic(Boolean dynamic) {
        this.dynamic = dynamic;
    }

    public List<Integer> getGeoTarget() {
        return geoTarget;
    }

    public void setGeoTarget(List<Integer> geoTarget) {
        this.geoTarget = geoTarget;
    }

    public TimeTarget getTimeTarget() {
        return timeTarget;
    }

    public void setTimeTarget(TimeTarget timeTarget) {
        this.timeTarget = timeTarget;
    }
}

Another DTO which is included in the CampainDTO:

public class TimeTarget {
    private List<String> monday;
    private List<String> tuesday;
    private List<String> wednesday;
    private List<String> thursday;
    private List<String> friday;
    private List<String> sunday;

    public List<String> getMonday() {
        return monday;
    }

    public void setMonday(List<String> monday) {
        this.monday = monday;
    }

    public List<String> getTuesday() {
        return tuesday;
    }

    public void setTuesday(List<String> tuesday) {
        this.tuesday = tuesday;
    }

    public List<String> getWednesday() {
        return wednesday;
    }

    public void setWednesday(List<String> wednesday) {
        this.wednesday = wednesday;
    }

    public List<String> getThursday() {
        return thursday;
    }

    public void setThursday(List<String> thursday) {
        this.thursday = thursday;
    }

    public List<String> getFriday() {
        return friday;
    }

    public void setFriday(List<String> friday) {
        this.friday = friday;
    }

    public List<String> getSunday() {
        return sunday;
    }

    public void setSunday(List<String> sunday) {
        this.sunday = sunday;
    }
}

And the last part is your controller. Note that here it works as an echo - it returns exactly what you posted. That's why I added @ResponseBody here.

@Controller
public class CampainController {

    @RequestMapping(name = "/test", method = RequestMethod.POST)
    @ResponseBody
    public CampaignDTO test(@RequestBody CampaignDTO campaignDTO) {
        return campaignDTO;
    }
}

After you post your request to http://localhost:8080/test it should work properly.