CODEWITHSUNDEEP
javaspringneo4jspring-data-neo4jspring-data-neo4j-4
mohit sharma
mohit sharma

Reputation: 1070

Neo4j returns null when restart spring boot application

I am working on a Spring Boot application that uses Neo4j for data storage,

I have a relationship of SkillCategory and Skills. So one SKillCategory contains many skills. Below is the Domain structure:

Skill.java

@NodeEntity
public class Skill extends BaseEntity {
    private String name;
    private boolean isVerified;
    private boolean isEnabled = true;
    @Relationship(type = SKILL_OF_LEVEL, direction = "OUTGOING")
    private SkillLevel skillLevel;

    public Skill() {
    }

    public Skill(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public boolean isEnabled() {
        return isEnabled;
    }

    public void setEnabled(boolean enabled) {
        isEnabled = enabled;
    }

    public boolean isVerified() {
        return isVerified;
    }

    public void setVerified(boolean verified) {
        isVerified = verified;
    }

    public SkillLevel getSkillLevel() {
        return skillLevel;
    }

    public void setSkillLevel(SkillLevel skillLevel) {
        this.skillLevel = skillLevel;
    }
}

SkillCategory.java

@NodeEntity
public class SkillCategory extends BaseEntity {
    private String name;
    private boolean isEnabled = true;
    @Relationship(type =  CONTAINS_SKILL,direction = "OUTGOING")
    private List<Skill> skillList;

    public SkillCategory() {
    }

    public SkillCategory(String name) {
        this.name = name;
    }

    public SkillCategory(String name, List<Skill> skillList) {
        this.name = name;
        this.skillList = skillList;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public boolean isEnabled() {
        return isEnabled;
    }

    public void setEnabled(boolean enabled) {
        isEnabled = enabled;
    }

    public List<Skill> getSkillList() {
        return skillList;
    }

    public void setSkillList(List<Skill> skillList) {
        this.skillList = skillList;
    }
}

I am using GraphRepository to perform CRUD operations. I am creating SkillCategory & Skills on application boot.

Here is the problem: if I delete the DB & start Spring Boot, everything works fine. But when I restart the Spring Boot application, skillList in SkillCategory is null.

If anyone have experience in Spring Data Neo4j, kindly help me narrow down the issue.

Repository Code :

@Repository
public interface SkillGraphRepository extends GraphRepository<Skill>{
List<SkillCategory> findAll();
}

I assume that if i fetch skillCategory it'll automatically eager load to fetch skills in SkillCategory also

I am simply using a Service that injects SkillCategoryRepository 

skillCategoryService.create(new skillCategory("Category1"),Arrays.asList(new Skill("Skill 1"),new     SKill("Skill 2")));

Upvotes: 0

Views: 124

Answers (1)

digx1
digx1

Reputation: 1088

The data disappearance between start ups was caused by starting SDN with the embedded driver and an impermanent data store.

When setting the driver to: driver=org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver you must also make sure you set a location for the Neo4j datastore URI=file:///var/tmp/neo4j.db to make data persistable between start ups otherwise your data will only exist while the application is running.

More details can be found here.

Upvotes: 2

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