enums are being interpreted as Strings

问题

I am setting a sessionScope object when a user logs in, and that bean object is composed of a couple of other beans. One of the properties for these beans was an enum, but I found out that EL cannot get the properties of an enum class, and that it can only get the properties of a java bean object. So I decided to make a bean class for the enum, and have the enum nested in that bean class. the java bean that I made to replace the enum so that I can get its values with EL looks something like this:

public class RankBean implements Serializable {

    private static final long serialVersionUID = -1;

    private String rankName;

    public RankBean(String rankName) {
        this.rankName= rankName;
    }

    public RankBean(Rank rank) {
        this.rankName = rank.getRankName();
    }

    public String getRankName() {
            return rankName;
        }

    public void setRankName(String rankName) {
        this.rankName = rankName;
    }

    public static enum Rank {
        RANK_1("some rank name"),
        RANK_2("some rank name"),
        RANK_3("some rank name"),
        RANK_4("some rank name"),
        RANK_5("some rank name"),
        RANK_6("some rank name"),
        RANK_7("some rank name"),
        RANK_8("some rank name");

        private String rankName;

        private Rank(String rankName) {
            this.rankName = rankName;
        }

        public String getRankName() {
            return rankName;
        }

        public static Rank getRank(String rankName) {
            for (Rank rank : Rank.values()) {
                if (rank.getRankName().equals(rankName)) {
                    return rank;
                }
            }
            return null;
        }

        @Override
        public String toString() {
            return rankName;
        }
    }
}

However, when I try to access the rank name (or what ever property there may be), I still get a JSP error saying that the rank object is a String and a property named rankName does not exist in java.lang.String. This is the same problem I had when I was trying to get the properties of the enum directly, but now I am not. Here is the error message:

javax.el.PropertyNotFoundException: Property 'rankName' not found on type java.lang.String

So the following EL would cause error because rankName apparently doesnt exist.

${sessionScope.account.player.rank}

回答1:

Well my problem was that I was passing the RankBean object to a custom jsp tag file where I used the RankBean properties, and the defined attribute did not specify a type so it defaulted to java.lang.String.

回答2:

I can not see the setter method of rankname in the above code.

public void setankName(String rankName) {


 this.rankName = rankName;
    }

I think this would be setRankName

来源：https://stackoverflow.com/questions/19217285/enums-are-being-interpreted-as-strings

标签

jsp

jsf

enums