java.lang.IllegalArgumentException: No enum const class

Question

I use JAXB 2 to parse an XML file against an XSD schema and the XML tags are automatically unmarshalled during ant build to Java classes. Some enums are created. The code is:

@XmlType(name = "binQuality")
@XmlEnum
public enum BinQuality {

    GOOD,
    BAD,
    UGLY,
    NULL;

    public String value() {
        return name();
    }

    public static BinQuality fromValue(String v) {
        return valueOf(v);
    }
}

In my code I call:

BinQuality bq = BinQuality.valueOf(him.getToBinQuality());

in a loop and I get the exception only in the 91st iteration.

******* UPDATED *******

him.getToBinQuality() does return a valid enum (GOOD/BAD/UGLY/NULL). Below is an excerpt of logs.

....
2011-07-18 15:28:09 DEBUG (com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl:183) -> class com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl|exportToXml|him.getToBin():89|him.getToBinQuality():BAD
2011-07-18 15:28:09 DEBUG (com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl:183) -> class com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl|exportToXml|him.getToBin():90|him.getToBinQuality():UGLY
2011-07-18 15:28:09 DEBUG (com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl:183) -> class com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl|exportToXml|him.getToBin():91|him.getToBinQuality():BAD 
2011-07-18 15:28:09 WARN  (org.apache.struts.action.RequestProcessor:538) -> Unhandled Exception thrown: class java.lang.IllegalArgumentException

This seems really mysterious.

Java version used is 1.5.

Appreciate it.

Will

Answer 1

This is because no enum value could be found for your 91th entry. What is the value of the failed String?

Answer 2

Either your XML does not have a valid ENUM value (like 'good' in lowercase) or it has an empty tag, because if you try to eval an enum element via MyEnum.valueOf(null) it will throw an IllegalArgumentException.

Answer 3

Most probably this is because that him.getToBinQuality() does not return the valid string which is in this case String should be 'GOOD|BAD|UGLY|NULL'

You can easily debug this by printing the value on the log.