spring.datasource.url = jdbc:as400://blahblah....
spring.datasource.username = myuser
spring.datasource.password = password
spring.datasource.driver-class-name=com.ibm.as400.access.AS400JDBCDriver

<GlobalNamingResources>
    <Resource name="jdbc/BLAH" ..... />
</GlobalNamingResources>

spring.datasource.jndi-name=java:comp/env/jdbc/BLAH
spring.jpa.database-platform=org.hibernate.dialect.DB2400Dialect
spring.jpa.show-sql=true

o.s.w.c.s.GenericWebApplicationContext   :
Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration':
Unsatisfied dependency expressed through constructor parameter 0;
nested exception is org.springframework.beans.factory.BeanCreationException:

Error creating bean with name 'dataSource' defined in class path resource
[org/springframework/boot/autoconfigure/jdbc/JndiDataSourceAutoConfiguration.class]:

Bean instantiation via factory method failed;
nested exception is org.springframework.beans.BeanInstantiationException:
Failed to instantiate [javax.sql.DataSource]:

Factory method 'dataSource' threw exception; nested exception is
org.springframework.jdbc.datasource.lookup.DataSourceLookupFailureException:

Failed to look up JNDI DataSource with name 'java:comp/env/jdbc/BLAH';

nested exception is javax.naming.NoInitialContextException:
Need to specify class name in environment or system property, or as an applet parameter,
or in an application resource file:  java.naming.factory.initial

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
    <relativePath/>
</parent>
...
<dependencies>
    <dependency>
        <groupId>net.sf.jt400</groupId>
        <artifactId>jt400</artifactId>
        <version>6.7</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-spring-boot-starter</artifactId>
        <version>1.1.1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>
    ....
</dependencies>

@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}


@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(basePackages = "com.company.myapp")
@EnableJpaRepositories(basePackages = "com.company.myapp.repository")
@EnableTransactionManagement
@EnableVaadin
@EnableVaadinServlet
public class AppConfiguration {
}