Spring Data - SpelEvaluationException - Property or field cannot be found on null

Question

I'm trying to use Spring Expression Language to configure an annotation from Spring Data ElasticSearch dynamically. The solutions I tried (this and this) produce the following error in my case:

Caused by: SpelEvaluationException: EL1007E: Property or field
'DbCreatorIndexNameConfig' cannot be found on null

The annotation in question is:

@ComponentScan(basePackageClasses = DbCreatorIndexNameConfig.class)
@Document(indexName = "#{DbCreatorIndexNameConfig.indexName()}", type = "video", 
shards = 1, replicas = 0)
public class Video implements EsModel {
//...

The bean in question:

@Configuration("DbCreatorIndexNameConfig")
@ComponentScan(basePackageClasses = Video.class)
public class DbCreatorIndexNameConfig {

    @Value("video_default")
    public String indexName;

    @Bean
    public String indexName() {
        return indexName;
    }

    public void setIndexName(String indexName) {
        this.indexName = indexName;
    }
}

Notes:

• I have made sure, that the bean is wired into the application context via new AnnotationConfigApplicationContext(EsSpringTemplate.class, DbCreatorIndexNameConfig.class);

• I have made sure that Spring knows the needed beans. They appear in annotationConfigApplicationContext.getBeanDefinitionNames().

• indexName must be a constant. Therefor it seems only possible to use SpEL

Any idea is highly appreciated! Thanks!

Answer 1

Modify it as follows:- You have to use '@' to access a bean in spel

@Document(indexName = "#{@DbCreatorIndexNameConfig.indexName()}", type = "video", 
shards = 1, replicas = 0)