Unreadable session after serialization

I use Spring session with a Redis repository.
I also use the same Redis to store cache data.
It works fine but I the session attributes that are storred in Redis are unreadable.
When I try to read the content of the repository, I see this :
http://img11.hostingpics.net/pics/492480redisexpiration.png

Here is my configuration classes :

@Configuration
@EnableRedisHttpSession
public class SessionRepositoryConfig {
    @Value("${spring.redis.host}")
    private String redisHostName;

    @Value("${spring.redis.port}")
    private Integer redisPort;

    @Value("${spring.redis.expiration.short}")
    private Integer redisExpirationShort;

    @Value("${spring.redis.expiration.medium}")
    private Integer redisExpirationMedium;

    @Value("${spring.redis.expiration.long}")
    private Integer redisExpirationLong;

    @Bean
    JedisConnectionFactory jedisConnectionFactory() {
        JedisConnectionFactory factory = new JedisConnectionFactory();
        factory.setHostName(redisHostName);
        factory.setPort(redisPort);
        factory.setUsePool(true);
        return factory;
    }
    @Bean
    @Order(value = 0)
    public FilterRegistrationBean sessionRepositoryFilterRegistration(SessionRepositoryFilter springSessionRepositoryFilter) {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new DelegatingFilterProxy(springSessionRepositoryFilter));
        filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));
        return filterRegistrationBean;
    }
}


@Configuration
@EnableCaching
public class RedisConfiguration extends CachingConfigurerSupport {
    @Primary
    @Bean
    public RedisTemplate<String,ExpiringSession> redisTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<String, ExpiringSession> template = new RedisTemplate<>();

        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        template.setHashValueSerializer(new LdapFailAwareRedisObjectSerializer());

        template.setConnectionFactory(connectionFactory);
        return template;
    }
    @Bean
    public KeyGenerator keyGenerator() {
        return (target, method, params) -> {
            StringBuilder sb = new StringBuilder();
            sb.append(target.getClass().getName());
            sb.append(method.getName());
            for (Object obj : params) {
                sb.append(obj.toString());
            }
            return sb.toString();
        };
    }
}

I use a custom serializer because I had an issue with the serialization of ldap information (http://stackoverflow.com/questions/32751094/spring-boot-with-session-redis-serialization-error-with-bad-active-directory-lda).

Any idea why I can't read content of the redis database ?
I think this is a serialization issue but I don't find any solution.

Start with the two configuration classes shown, especially the RedisTemplate serializer settings and the @EnableRedisHttpSession setup. Trace which serializer Spring Session uses for its Redis hashes and compare it with the custom hash serializer; done means identifying why the stored session data is unreadable and documenting a supported configuration or limitation.