AbstractTradingMarket.java

package com.mangofactory;

import javax.persistence.Entity;
import javax.persistence.MappedSuperclass;
import javax.persistence.OneToOne;

  @Entity
	public abstract class AbstractTradingMarket<T extends Tradable> implements Market<T>{
	
		@OneToOne
		private TradingMarketLedger<AbstractTradingMarket<T>> ledger;
	
		
	}

CommonFuturesMarket.java

package com.mangofactory;

import javax.persistence.Entity;

@Entity
public class CommonFuturesMarket extends FuturesMarket {

}

FuturesMarket.java

package com.mangofactory;

import javax.persistence.Entity;

  @Entity
	public class FuturesMarket extends AbstractTradingMarket<FutureTrade> {

}

FutureTrade.java

package com.mangofactory;

import javax.persistence.Entity;

@Entity
public class FutureTrade implements Tradable {

  
}

Market.java

package com.mangofactory;

public interface Market<T extends Tradable> {

}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.mangofactory</groupId>
	<artifactId>queryDSL-test</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<properties>
		<query.dsl.version>2.9.0</query.dsl.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>com.mysema.querydsl</groupId>
			<artifactId>querydsl-jpa</artifactId>
			<version>${query.dsl.version}</version>
		</dependency>
		<dependency>
			<groupId>com.mysema.querydsl</groupId>
			<artifactId>querydsl-apt</artifactId>
			<version>${query.dsl.version}</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<version>0.11.4</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.hibernate.javax.persistence</groupId>
			<artifactId>hibernate-jpa-2.0-api</artifactId>
			<version>1.0.1.Final</version>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>com.mysema.maven</groupId>
				<artifactId>apt-maven-plugin</artifactId>
				<version>1.0.8</version>
				<executions>
					<execution>
						<goals>
							<goal>process</goal>
						</goals>
						<configuration>
							<outputDirectory>target/generated-sources/java</outputDirectory>
							<processor>com.mysema.query.apt.jpa.JPAAnnotationProcessor</processor>
						</configuration>
					</execution>
				</executions>
				<dependencies>
					<dependency>
						<groupId>com.mysema.querydsl</groupId>
						<artifactId>querydsl-apt</artifactId>
						<version>${query.dsl.version}</version>
					</dependency>
					<dependency>
						<groupId>com.mysema.querydsl</groupId>
						<artifactId>querydsl-jpa</artifactId>
						<classifier>apt</classifier>
						<version>${query.dsl.version}</version>
					</dependency>
				</dependencies>
			</plugin>
		</plugins>
	</build>
</project>

Tradable.java

package com.mangofactory;

public interface Tradable {

}

TradingMarketLedger.java

package com.mangofactory;

import javax.persistence.Entity;

  @Entity
	public class TradingMarketLedger<M extends Market<? extends Tradable>> {}