Zystkmt

I have a springboot application which I hooked up with cassandra. I am trying to create a map inside a map but getting the below exception.

com.datastax.driver.core.exceptions.InvalidQueryException: Non-frozen collections are not allowed inside collections: map<text, map<text, int>>

Code

@Table

@Data

public class AssessmentSubmissionEntity {



    @PrimaryKey()

    private UUID id;



    @Column

    private Map<String, Map<String,Integer>> assessmentMap;





}

man

<dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-data-cassandra</artifactId>

        </dependency>

        <dependency>

            <groupId>com.datastax.cassandra</groupId>

            <artifactId>cassandra-driver-core</artifactId>

        </dependency>

        <dependency>

            <groupId>com.datastax.cassandra</groupId>

            <artifactId>cassandra-driver-mapping</artifactId>

        </dependency>

Please have a look into Non frozen collections and user defined types on Cassandra 2.1.8.

You need to add frozen keyword:

@Column

private Map<String, frozen Map<String,Integer>> assessmentMap;