Intermittent issue with binding enum to select tag

[digitalsanctum]

I have an issue where it seems every other deploy of my app to production results in the following exception:

ERROR [org.springframework.web.servlet.tags.form.SelectTag] Invalid property 'label' of bean class [com.voxeo.evolution.domain.EmployeeType]: Bean property 'label' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
org.springframework.beans.NotReadablePropertyException: Invalid property 'label' of bean class [com.voxeo.evolution.domain.EmployeeType]: Bean property 'label' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:729)
at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:721)
at org.springframework.web.servlet.tags.form.OptionWriter.doRenderFromCollection(OptionWriter.java:216)
at org.springframework.web.servlet.tags.form.OptionWriter.renderFromArray(OptionWriter.java:158)
at org.springframework.web.servlet.tags.form.OptionWriter.writeOptions(OptionWriter.java:136)
at org.springframework.web.servlet.tags.form.SelectTag.writeTagContent(SelectTag.java:222)
at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:102)
at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79)
at org.apache.jsp.WEB_002dINF.views.employeedir.employeeForm_jsp._jspx_meth_form_005fselect_005f0(employeeForm_jsp.java:1089)

The enum looks like this:

public enum EmployeeType {
    ALL("All", "All"),
    PERS("Person", "People"),
    ZCON("Conference Room", "Conference Rooms"),
    ZFAX("Fax", "Fax Numbers"),
    ZOFF("Office", "Offices"),
    ZOTH("Other", "Other");

    private String label;
    private String pluralLabel;

    EmployeeType(String label, String pluralLabel) {
        this.label = label;
        this.pluralLabel = pluralLabel;
    }

    public String getLabel() {
        return label;
    }

    public String getPluralLabel() {
        return pluralLabel;
    }
}

Here's the relevant JSP snippet:

<form:select path="type" items="${types}" itemLabel="label"/>

Here's the controller code where I add the enum values to the model:

model.addAttribute("types", EmployeeType.values());

I'm never able to reproduce the exception locally. I've scoured the forums and google but it doesn't seem to be a common issue.

Anyone see this before?

[borgra]

I am experiencing something very similar. Did you find a fix for this? Which application server are you using? I'm using Tomcat 6.0.35.

[digitalsanctum]

Yes, the issue was a bug in Spring 3.1:

https://jira.springsource.org/browse/SPR-9059

https://jira.springsource.org/browse/SPR-8347

Upgrading to Spring 3.1.1 fixed this issue for me.