@Entity
@Searcheable
public class Document {
...
    @OneToMany
    @SearchableComponent
    private List<DocumentAttribute<?>> attributes;
...
}

CompassConfiguration conf = 
    new CompassConfiguration()
        .setSetting(CompassEnvironment.CONNECTION, "my/index/dir")
        .addScan("my.general.package");

Caused by: java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast to java.lang.Class
	at org.compass.annotations.config.binding.AnnotationsBindingUtils.getCollectionParameterClass(AnnotationsBindingUtils.java:55)
	at org.compass.annotations.config.binding.AnnotationsMappingBinding.getConverter(AnnotationsMappingBinding.java:998)
	at org.compass.annotations.config.binding.AnnotationsMappingBinding.bindConverter(AnnotationsMappingBinding.java:994)
	at org.compass.annotations.config.binding.AnnotationsMappingBinding.bindComponent(AnnotationsMappingBinding.java:622)
	at org.compass.annotations.config.binding.AnnotationsMappingBinding.processsAnnotatedElement(AnnotationsMappingBinding.java:529)
	at org.compass.annotations.config.binding.AnnotationsMappingBinding.processAnnotatedClass(AnnotationsMappingBinding.java:478)
	at org.compass.annotations.config.binding.AnnotationsMappingBinding.processAnnotatedClass(AnnotationsMappingBinding.java:403)
	at org.compass.annotations.config.binding.AnnotationsMappingBinding.addClass(AnnotationsMappingBinding.java:243)
	at org.compass.core.config.binding.AbstractClassMetaDataMappingBinding.doAddInputStream(AbstractClassMetaDataMappingBinding.java:39)
	at org.compass.core.config.binding.AbstractInputStreamMappingBinding.internalAddInputStream(AbstractInputStreamMappingBinding.java:198)
	at org.compass.core.config.binding.AbstractInputStreamMappingBinding.addInputStream(AbstractInputStreamMappingBinding.java:180)
	at org.compass.core.config.CompassMappingBinding.addInputStream(CompassMappingBinding.java:191)
	at org.compass.core.config.CompassConfiguration.addScan(CompassConfiguration.java:593)
	at org.compass.core.config.CompassConfiguration.addScan(CompassConfiguration.java:547)

public static Class getCollectionParameterClass(Class<?> clazz, Type type) {
        if (Collection.class.isAssignableFrom(clazz)) {
            if (type instanceof ParameterizedType) {
                ParameterizedType paramType = (ParameterizedType) type;
                Type[] actualTypeArguments = paramType.getActualTypeArguments();
                if (actualTypeArguments != null && actualTypeArguments.length == 1) {
                    return (Class) actualTypeArguments[0];
                }
            }
        }
        return null;
    }

public static Class getCollectionParameterClass(Class<?> clazz, Type type) {
        if (Collection.class.isAssignableFrom(clazz)) {
            if (type instanceof ParameterizedType) {
                ParameterizedType paramType = (ParameterizedType) type;
                Type[] actualTypeArguments = paramType.getActualTypeArguments();
                if (actualTypeArguments != null && actualTypeArguments.length == 1) {
                    Type actualType = actualTypeArguments[0];
                    if (actualType instanceof Class) {
                        return (Class) actualTypeArguments[0];
                    } else if (actualType instanceof ParameterizedType) {
                        return (Class) ((ParameterizedType) actualType).getRawType();
                    }
                }
            }
        }
        return null;
    }