Java ee6 with scala

Java EE 6 with Scala
@megascus

自己紹介

• twitter id: @megascus

• 仕事では銀行常駐してC#な案件やってます。

• Java EE Advent Calendarぜひ見て下さい！

http://atnd.org/events/33783

Scalaってなんだ

Object指向型言語と関数型言語を統合した言語で最近注
目されている。
Twitter社も採用。

Entity(Java)

@Entity
public class EntityClass implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}
}

Entity(Scala)

@Entity
@serializable
class EntityClass {
@Id
@GeneratedValue (strategy = GenerationType.AUTO)
@BeanProperty // GetterとSetterの自動生成
var id: Long = _
}

EJB(Java)
@Stateless
@LocalBean
public class CrudEJB {

@PersistenceContext(unitName = "default")
protected EntityManager manager;

public EntityClass create(EntityClass entity) {
manager.persist(entity);
return entity;
}

public List<EntityClass> readAll() {
return manager.createNamedQuery("ﬁndAll").getResultList();
}

public EntityClass read(Long id) {
return manager.ﬁnd(EntityClass.class, id);
}

public EntityClass update(EntityClass entity) {
return manager.merge(entity);
}

public void delete(EntityClass entity) {
manager.remove(entity);
}
}

EJB(Scala)

@Stateless
@LocalBean
class CrudEJB {
@PersistenceContext(unitName="default")
protected var manager: EntityManager = _

def create(entity: EntityClass): EntityClass = {
manager persist entity
entity
}
def readAll()(entity: EntityClass) = manager createNamedQuery ("ﬁndAll") getResultList

def read(id: Long) = manager ﬁnd classOf[EntityClass] id

def update(entity: EntityClass) = manager merge entity

def delete(entity: EntityClass): Unit = manager remove entity
}

Build

今回はMavenを使うので

pom.xmlに設定を追記していきます。

repository
<repositories>
<repository>
<id>scala-tools.org</id>
<name>Scala-tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>scala-tools.org</id>
<name>Scala-tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</pluginRepository>
</pluginRepositories>

dependency

<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.9.2</version>
</dependency>

plugin

<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<version>2.15.2</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>

フォルダ構成

.
├ pom.xml
└ src
└ main
├ java
├ resources
│ └ META-INF
├ scala //ここにScalaのソースを入れていく
└ webapp

ソースコード

• https://github.com/megascus/JavaEE6Scala

Java ee6 with scala

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