Product Catalog

What Morphium Offers

Morphium maps Java objects to MongoDB documents with annotations. @Entity, @Id, @Cache, @Index — four annotations turn a POJO into a cached, indexed document. Embedded sub-documents, field name mapping and write safety are all declarative.

The Challenge

Traditional ODMs require XML mapping files or manual codec registries. The MongoDB Java driver gives you raw BSON documents with no type safety. Morphium eliminates both problems with a pure-annotation approach that works at the field level.

Morphium Features Used

Prerequisites & Key Concepts

Lombok @FieldNameConstants generates an inner class Product.Fields with constants like Fields.name, Fields.price. These are used in Morphium queries instead of hard-coded strings: query.f(Product.Fields.name).
MorphiumId is Morphium's own ObjectId type, compatible with MongoDB's native ObjectId. Import: de.caluga.morphium.driver.MorphiumId.
@Embedded goes on the sub-document class (e.g. Category), NOT on the field in the parent. An @Embedded class must NOT also have @Entity.
@Cache requires the Morphium cache to be enabled. In Quarkus: quarkus.morphium.cache.read-cache-enabled=true (default). The cache is auto-invalidated on writes through the same Morphium instance.
Compound Index @Index on the class creates a compound index — optimal for price-range queries sorted by name.

Entity Relationship

Product (@Entity)

_id: MorphiumId @Id

name: String @Index

product_description: String @Property

price: double @Index

stock: int

category: Category @Embedded

tags: List<String>

@Embedded →

Category (@Embedded)

name: String

description: String

@Entity @Embedded @Reference

Entity Source Code

Product.java Java

import de.caluga.morphium.annotations.Entity;
import de.caluga.morphium.annotations.Id;
import de.caluga.morphium.annotations.Index;
import de.caluga.morphium.annotations.Property;
import de.caluga.morphium.annotations.caching.Cache;
import de.caluga.morphium.annotations.caching.Cache.ClearStrategy;
import de.caluga.morphium.annotations.WriteSafety;
import de.caluga.morphium.annotations.SafetyLevel;
import de.caluga.morphium.annotations.DefaultReadPreference;
import de.caluga.morphium.annotations.ReadPreferenceLevel;
import de.caluga.morphium.driver.MorphiumId;
import lombok.Data;
import lombok.experimental.FieldNameConstants;
import java.util.List;

@Entity(collectionName = "products") 1
@Index("-price, name") 2
@Cache(maxEntries = 100, strategy = ClearStrategy.LRU, timeout = 30000) 3
@WriteSafety(level = SafetyLevel.NORMAL) 4
@DefaultReadPreference(ReadPreferenceLevel.PRIMARY) 5
@Data @FieldNameConstants
public class Product {

    @Id 6
    private MorphiumId id;

    @Index
    private String name;

    @Property(fieldName = "product_description") 7
    private String description;

    @Index
    private double price;

    private int stock;

    private Category category; 8

    private List<String> tags;
}

1 Maps this class to the products MongoDB collection

2 Compound index on price (descending) and name — optimizes sorted range queries

3 LRU read cache: max 100 entries, auto-invalidated after 30s or on writes

4 Write concern: acknowledged writes (w:1)

5 Always read from the primary replica

6 Primary key → MongoDB _id. Auto-generated on first store()

7 Overrides the MongoDB field name: Java description → MongoDB product_description

8 Embedded sub-document — stored inline, no separate collection

Category.java Java

import de.caluga.morphium.annotations.Embedded;
import lombok.Data;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

@Embedded 1
@Data @NoArgsConstructor @AllArgsConstructor
public class Category {
    private String name;
    private String description;
}

1 Marks this class as an embedded sub-document — must NOT also have @Entity

Service Code

CRUD Operations

Morphium API — CRUD Java

import de.caluga.morphium.Morphium;

@Inject Morphium morphium;

// Store (insert or upsert) a product
morphium.store(product);

// Bulk insert
morphium.storeList(products);

// Delete a single entity
morphium.delete(product);

// Find by ID
morphium.findById(Product.class, id);

Query Examples

Morphium API — Queries Java

// Find all products
morphium.createQueryFor(Product.class).asList();

// Search by name (regex, case-insensitive)
morphium.createQueryFor(Product.class)
    .f(Product.Fields.name).matches("(?i)laptop")
    .asList();

// Price range query with sort
morphium.createQueryFor(Product.class)
    .f(Product.Fields.price).gte(min)
    .f(Product.Fields.price).lte(max)
    .sort(Map.of(Product.Fields.price, 1))
    .asList();

// Query embedded sub-document fields
morphium.createQueryFor(Product.class)
    .f("category.name").eq("Electronics")
    .asList();

// Distinct values
morphium.createQueryFor(Product.class)
    .distinct(Product.Fields.name);