TLS version defaults to v1

Question

I am using a third party provided java SDK to make HTTP calls (SDK provides http client). When i invoke the SDK through a simple java program i see TLSv1.2 being used and calls are successful. But when i invoke the SDK through a spring-boot application (same code), the call is failing because of unsupported TLSv1 usage.

using simple java program,

public class SdkTest {
    public static void main(String[] args) throws IOException {
        sdk.invoke(...);
    }
}

using spring-boot,

@ComponentScan
@EnableAutoConfiguration
public class MyApplication extends SpringBootServletInitializer {
    public static void main(String[] args) throws IOException {
        SpringApplication.run(MyApplication.class);
    }
}

@Controller
public class TestController {
    @RequestMapping("/")
    public void test() {
        sdk.invoke(...);
    }
}

Question :

1. How is TLS version selected ?
2. Why is a different version of TLS is being selected in different programs.

Note: The SDK provides a http client to connect to a third part server.