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@Column(name = "AMOUNT")
private BigDecimal amount;

<datatype id="decimal" class="com.haulmont.chile.core.datatypes.impl.BigDecimalDatatype"
          default="true"
          format="0.####" decimalSeparator="." groupingSeparator=""/>

@MetaProperty(datatype = "year")
@Column(name = "ISSUE_YEAR")
private Integer issueYear;

<datatype id="year" class="com.company.sample.YearDatatype"/>

<metadata xmlns="http://schemas.haulmont.com/cuba/metadata.xsd">
    <!-- ... -->

    <annotations>
        <entity class="com.company.customers.entity.Customer">
            <annotation name="com.haulmont.cuba.core.entity.annotation.TrackEditScreenHistory">
                <attribute name="value" value="true" datatype="boolean"/>
            </annotation>

            <property name="name">
                <annotation name="length" value="200"/>
            </property>

            <property name="customerGroup">
                <annotation name="com.haulmont.cuba.core.entity.annotation.Lookup">
                    <attribute name="type" class="com.haulmont.cuba.core.entity.annotation.LookupType" value="DROPDOWN"/>
                    <attribute name="actions" datatype="string">
                        <value>lookup</value>
                        <value>open</value>
                    </attribute>
                </annotation>
            </property>
        </entity>

        <entity class="com.company.customers.entity.CustomerGroup">
            <annotation name="com.haulmont.cuba.core.entity.annotation.EnableRestore">
                <attribute name="value" value="false" datatype="boolean"/>
            </annotation>
        </entity>
    </annotations>
</metadata>

View view = new View(Order.class)
        .addProperty("date")
        .addProperty("amount")
        .addProperty("customer", new View(Customer.class)
            .addProperty("name")
        );

package com.sample.sales.core;

import org.springframework.jmx.export.annotation.*;
import com.haulmont.cuba.core.sys.jmx.JmxBean;

@JmxBean(module = "sales", alias = "OrdersMBean")
@ManagedResource(description = "Performs operations on Orders")
public interface OrdersMBean {
    @ManagedOperation(description = "Recalculates an order amount")
    @ManagedOperationParameters({@ManagedOperationParameter(name = "orderId", description = "")})
    String calculateTotals(String orderId);
}

package com.sample.sales.core;

import com.haulmont.cuba.core.*;
import com.haulmont.cuba.core.app.*;
import com.sample.sales.entity.Order;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.springframework.stereotype.Component;
import javax.inject.Inject;
import java.util.UUID;

@Component("sales_OrdersMBean")
public class Orders implements OrdersMBean {

    @Inject
    protected OrderWorker orderWorker;

    @Inject
    protected Persistence persistence;

    @Authenticated
    @Override
    public String calculateTotals(String orderId) {
        try {
            try (Transaction tx = persistence.createTransaction()) {
                Order entity = persistence.getEntityManager().find(Order.class, UUID.fromString(orderId));
                orderWorker.calculateTotals(entity);
                tx.commit();
            };
            return "Done";
        } catch (Throwable e) {
            return ExceptionUtils.getStackTrace(e);
        }
    }
}

<bean id="sales_MBeanExporter" lazy-init="false"
      class="com.haulmont.cuba.core.sys.jmx.MBeanExporter">
    <property name="beans">
        <map>
            <entry key="${cuba.webContextName}.sales:type=Orders"
                   value-ref="sales_OrdersMBean"/>
        </map>
    </property>
</bean>

@Inject
private DataManager dataManager;

private Book loadBookById(UUID bookId) {
    return dataManager.load(Book.class).id(bookId).view("book.edit").one();
}

private List<BookPublication> loadBookPublications(UUID bookId) {
    return dataManager.load(BookPublication.class)
        .query("select p from library$BookPublication p where p.book.id = :bookId")
        .parameter("bookId", bookId)
        .view("bookPublication.full")
        .list();
}

List<KeyValueEntity> list = dataManager.loadValues(
        "select o.customer, sum(o.amount) from demo$Order o " +
        "where o.date >= :date group by o.customer")
    .store("legacy_db") (1)
    .properties("customer", "sum") (2)
    .parameter("date", orderDate)
    .list();

BigDecimal sum = dataManager.loadValue(
        "select sum(o.amount) from demo$Order o " +
        "where o.date >= :date group by o.customer", BigDecimal.class)
    .store("legacy_db") (1)
    .parameter("date", orderDate)
    .one();

@Inject
private DataManager dataManager;

private Book loadBookById(UUID bookId) {
    LoadContext<Book> loadContext = LoadContext.create(Book.class)
            .setId(bookId).setView("book.edit");
    return dataManager.load(loadContext);
}

private List<BookPublication> loadBookPublications(UUID bookId) {
    LoadContext<BookPublication> loadContext = LoadContext.create(BookPublication.class)
            .setQuery(LoadContext.createQuery("select p from library$BookPublication p where p.book.id = :bookId")
                .setParameter("bookId", bookId))
            .setView("bookPublication.full");
    return dataManager.loadList(loadContext);
}

ValueLoadContext context = ValueLoadContext.create()
        .setQuery(ValueLoadContext.createQuery(
                    "select o.customer, sum(o.amount) from demo$Order o " +
                    "where o.date >= :date group by o.customer")
            .setParameter("date", orderDate))
        .addProperty("customer")
        .addProperty("sum");
List<KeyValueEntity> list = dataManager.loadValues(context);

@Inject
private DataManager dataManager;

private void saveBookInstances(List<BookInstance> toSave, List<BookInstance> toDelete) {
    CommitContext commitContext = new CommitContext(toSave, toDelete);
    dataManager.commit(commitContext);
}

private Set<Entity> saveAndReturnBookInstances(List<BookInstance> toSave, View view) {
    CommitContext commitContext = new CommitContext();
    for (BookInstance bookInstance : toSave) {
        commitContext.addInstanceToCommit(bookInstance, view);
    }
    return dataManager.commit(commitContext);
}

@Inject
protected Messages messages;
...
String message1 = messages.getMessage(getClass(), "someMessage");
String message2 = messages.getMessage("com.abc.sales.web.customer", "someMessage");
String message3 = messages.getMessage(RoleType.STANDARD);

String formattedValue = messages.formatMessage(getClass(), "someFormat", someValue);

protected Messages messages = AppBeans.get(Messages.class);
...
messages.getMainMessage("actions.Ok");

String formattedValue = messages.formatMessage(messages.getMainMessagePack(), "someFormat", someValue);

@Inject
protected Resources resources;
...
InputStream stream = null;
try {
    stream = resources.getResourceAsStream(resourceLocation);
    ...
} finally {
    IOUtils.closeQuietly(stream);
}

try (InputStream stream = resources.getResourceAsStream(resourceLocation)) {
    ...
}

@Inject
protected Scripting scripting;
...
Integer intResult = scripting.evaluateGroovy("2 + 2", new Binding());

Binding binding = new Binding();
binding.setVariable("instance", new User());
Boolean boolResult = scripting.evaluateGroovy("return PersistenceHelper.isNew(instance)", binding);

@Inject
protected Scripting scripting;
...
Binding binding = new Binding();
binding.setVariable("itemId", itemId);
BigDecimal amount = scripting.runGroovyScript("com/abc/sales/CalculatePrice.groovy", binding);