enum valueOf IllegalArgumentException: No enum const class

Question

I have used enums in java in the past but for some reason I am getting a strange error right now. the Line of code that it is throwing the error is:

switch(ConfigProperties.valueOf(line[0].toLowerCase()){
    ...
}

I am getting a

java.lang.IllegalArgumentException: No enum const class
  allautomator.ConfigProperties.language

in the example line is an array of Strings.

I am just really confused right now, I do not know what could possibly be wrong.

Please post your enum and the value of line[0]. The valueOf function expects an EXACT string. No extra spaces, punctuation, etc. I don't know if it's case sensitive but I'd assume it for now. — Mohamed Nuur
– Mohamed Nuur, Commented May 19, 2011 at 18:07
Can you add your Enum class and the content of the line array as well? Just to make sure we can see what are the inputs and what Enums you have. — TS-
– TS-, Commented May 19, 2011 at 18:08

aioobe · Accepted Answer · 2011-05-19 18:18:51Z

21

The enum constants are case sensitive, so make sure you're constants are indeed lower case. Also, I would suggest that you trim() the input as well to make sure no leading / trailing white-space sneak in there:

ConfigProperties.valueOf(line[0].toLowerCase().trim())

For reference, here is a working sample program containing your line:

enum ConfigProperties { prop1, prop2 }

class Test {
    public static void main(String[] args) {

        String[] line = { "prop1" };

        switch (ConfigProperties.valueOf(line[0].toLowerCase())) {
        case prop1: System.out.println("Property 1"); break;
        case prop2: System.out.println("Property 2"); break;
        }
    }
}

Output:

Property 1

edited May 19, 2011 at 18:18

answered May 19, 2011 at 18:07

aioobe

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3 Comments

Ryan Sullivan Over a year ago

I made sure of the case and they are in lower case but the trim is what I needed to do. Thank you.

Geek Over a year ago

@ajoobe you are calling valueOf() on an enum type. But I do not see this method in the javadocs. Why so? The method declaration looks like public static <T extends Enum<T>> T valueOf(Class<T> enumType, String name). Here you are only passing the second parameter? What am I missing here?

aioobe Over a year ago

@Geek, this is explained over here.

Mircea Stanciu · Accepted Answer · 2017-10-13 23:09:55Z

-1

I am using a similar concept, but having a default value in case of fail

public enum SortType {

    PRICE_ASC("price_asc"),
    PRICE_DESC("price_desc"),
    MODEL_ASC("model_asc"),
    MODEL_DESC("model_desc");

    private String name;

    SortType(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    static public SortType lookup(String id, SortType defaultValue) {
        try {
            return SortType.valueOf(id);
        } catch (IllegalArgumentException ex) {
            return defaultValue;
        }
    }
}

answered Oct 13, 2017 at 23:09

Mircea Stanciu

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