How do I enable @Required Annotation in JavaConfig?

[JavaGeek_Boston]

Hello,
I'm trying to port an existing application to JavaConfig. How do I enable the @Required annotation? In XML, I did so via the <context:annotation-config/> tag. My code is:

@ContextConfiguration(locations = "mypackage.ApplicationConfig", loader = JavaConfigContextLoader.class)
public class ReplicatedStoreTest extends AbstractTestNGSpringContextTests{

	@Test
	public void test() {
		Assert.assertNotNull(config);
	}
	
	@Autowired
	StartupParameters config;
}

It's injecting properly into the config object, but ignoring the @Required in StartupParameters

Thanks in Advance,
Steven
Harvard Children's Hospital Informatics Program

[JavaGeek_Boston]

@Configuration(checkRequired=true)
public class ApplicationConfig {
	@Bean
	public StartupConfig getConfig() {
		StartupConfig startup = new StartupConfig();
		return startup;
	}

	@Bean
	public BDBWrapper getWrapper() throws DatabaseException {
		return new BDBWrapper(getConfig());
	}
	
}

[Chris Beams]

Yes, checkRequired=true is part of the equation. For @Required checking to work, you must enable an aspect - take a look at SJC's atrequired sample for details:

https://fisheye.springframework.org/...les.atrequired

[JavaGeek_Boston]

Thanks for the quick reply Chris,
My code is now checking the @Required annotation, but doesn't recognize it when I set it. I get "Method 'setCacheSize' is required for bean 'getConfig'" despite having clearly set the property. Did I use the annotations incorrectly? Could this have something to do with AbstractTestNGSpringContextTests?

Here's my test:

@ContextConfiguration(locations = "mydomain.ApplicationConfig", loader = JavaConfigContextLoader.class)
public class ReplicatedStoreTest extends AbstractTestNGSpringContextTests{

	@Test
	public void test() {
		logger.debug(config);
		Assert.assertNotNull(config);
	}
	
	@Autowired
	StartupConfig config;
}

Here's my config:

//@PropertiesValueSource(locations="file:${user.home}/.isg/test.properties")   //temporarily hidden until I can get this reading ${user.home}
@PropertiesValueSource(locations={"classpath:/myproject.properties", 
        "file:/home/myname/.isg/test.properties"})
@Configuration(checkRequired=true)
public abstract class ApplicationConfig {
	@Bean
	public StartupConfig getConfig() {
		StartupConfig startup = new StartupConfig();
		startup.setCacheSize(getCache());
		return startup;
	}
	@ExternalValue(value="myproject.bdbhome")
	public abstract String getBDBDir();

	@ExternalValue(value="myproject.cache")
	public abstract int getCache();
}

Here's the bean with the @Required annotation.

public class StartupConfig {
	private long cacheSize;
	public long getCacheSize() {
		return cacheSize;
	}
	@Required
	public void setCacheSize(long cacheSize) {
		this.cacheSize = cacheSize;
	}
}

Thanks in Advance,
Steven

[Chris Beams]

Read the following Javadoc: https://fisheye.springframework.org/...java?r=597#l17

JavaConfig cannot directly support @Required in the same way that Spring XML can, due to fundamental limitations. In order to emulate this support, you must bytecode weave an aspect against your objects that have @Required methods. That aspect is already written for you (RequiredMethodInvocationTracker), and is included in the SJC jar. You just need to either apply it using compile-time weaving or load-time weaving.

After reading, let me know what questions you have.