private MessageMappingMessageHandler initMesssageHandler() {

		List<Decoder<?>> decoders = Collections.singletonList(StringDecoder.allMimeTypes());
		List<Encoder<?>> encoders = Collections.singletonList(CharSequenceEncoder.allMimeTypes());

		ReactiveAdapterRegistry registry = ReactiveAdapterRegistry.getSharedInstance();
		this.returnValueHandler = new TestEncoderMethodReturnValueHandler(encoders, registry);

		PropertySource<?> source = new MapPropertySource("test", Collections.singletonMap("path", "path123"));

		StaticApplicationContext context = new StaticApplicationContext();
		context.getEnvironment().getPropertySources().addFirst(source);
		context.registerSingleton("testController", TestController.class);
		context.refresh();

		MessageMappingMessageHandler messageHandler = new MessageMappingMessageHandler();
		messageHandler.getReturnValueHandlerConfigurer().addCustomHandler(this.returnValueHandler);
		messageHandler.setApplicationContext(context);
		messageHandler.setEmbeddedValueResolver(new EmbeddedValueResolver(context.getBeanFactory()));
		messageHandler.setDecoders(decoders);
		messageHandler.afterPropertiesSet();

		return messageHandler;
	}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) {
	Assert.notNull(beanFactory, "BeanFactory must not be null");
	this.beanFactory = beanFactory;
	if (this.resourceFactory == null) {
		this.resourceFactory = beanFactory;
	}
	if (beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
}
 

/**
 * Making a {@link BeanFactory} available is optional; if not set,
 * {@link JmsListenerConfigurer} beans won't get autodetected and an
 * {@link #setEndpointRegistry endpoint registry} has to be explicitly configured.
 */
@Override
public void setBeanFactory(BeanFactory beanFactory) {
	this.beanFactory = beanFactory;
	if (beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
	this.registrar.setBeanFactory(beanFactory);
}
 

/**
 * Set the {@link BeanFactory} to use to resolve expressions (may be {@code null}).
 */
@Override
public void setBeanFactory(@Nullable BeanFactory beanFactory) {
	if (this.embeddedValueResolver == null && beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) {
	Assert.notNull(beanFactory, "BeanFactory must not be null");
	this.beanFactory = beanFactory;
	if (this.resourceFactory == null) {
		this.resourceFactory = beanFactory;
	}
	if (beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
}
 

/**
 * Making a {@link BeanFactory} available is optional; if not set,
 * {@link JmsListenerConfigurer} beans won't get autodetected and an
 * {@link #setEndpointRegistry endpoint registry} has to be explicitly configured.
 */
@Override
public void setBeanFactory(BeanFactory beanFactory) {
	this.beanFactory = beanFactory;
	if (beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
	this.registrar.setBeanFactory(beanFactory);
}
 

/**
 * Set the {@link BeanFactory} to use to resolve expressions (may be {@code null}).
 */
@Override
public void setBeanFactory(@Nullable BeanFactory beanFactory) {
	if (this.embeddedValueResolver == null && beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) {
	Assert.notNull(beanFactory, "BeanFactory must not be null");
	this.beanFactory = beanFactory;
	if (this.resourceFactory == null) {
		this.resourceFactory = beanFactory;
	}
	if (beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
    this.beanFactory = beanFactory;
    if (beanFactory instanceof ConfigurableBeanFactory) {
        this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
    }
}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
    this.beanFactory = beanFactory;
    if (beanFactory instanceof ConfigurableListableBeanFactory) {
        this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
        this.resolver = ((ConfigurableListableBeanFactory) beanFactory).getBeanExpressionResolver();
        this.expressionContext = new BeanExpressionContext((ConfigurableListableBeanFactory) beanFactory, null);
    }
}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
    this.beanFactory = beanFactory;
    if (beanFactory instanceof ConfigurableListableBeanFactory) {
        this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
        this.resolver = ((ConfigurableListableBeanFactory) beanFactory).getBeanExpressionResolver();
        this.expressionContext = new BeanExpressionContext((ConfigurableListableBeanFactory) beanFactory, null);
    }
}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) {
	if (beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
}
 

/**
 * Create a new ApplicationContextAwareProcessor for the given context.
 */
public ApplicationContextAwareProcessor(ConfigurableApplicationContext applicationContext) {
	this.applicationContext = applicationContext;
	this.embeddedValueResolver = new EmbeddedValueResolver(applicationContext.getBeanFactory());
}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) {
	if (beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
}
 

/**
 * Create a new ApplicationContextAwareProcessor for the given context.
 */
public ApplicationContextAwareProcessor(ConfigurableApplicationContext applicationContext) {
	this.applicationContext = applicationContext;
	this.embeddedValueResolver = new EmbeddedValueResolver(applicationContext.getBeanFactory());
}
 

@Override
public void setBeanFactory(BeanFactory beanFactory) {
	if (beanFactory instanceof ConfigurableBeanFactory) {
		this.embeddedValueResolver = new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory);
	}
}
 

/**
 * Create a new ApplicationContextAwareProcessor for the given context.
 */
public ApplicationContextAwareProcessor(ConfigurableApplicationContext applicationContext) {
	this.applicationContext = applicationContext;
	this.embeddedValueResolver = new EmbeddedValueResolver(applicationContext.getBeanFactory());
}
 

public ExpressionResolver(BeanFactory beanFactory) {
    if (beanFactory instanceof ConfigurableBeanFactory) {
        setEmbeddedValueResolver(new EmbeddedValueResolver((ConfigurableBeanFactory) beanFactory));
    }
}
 

private static void setEmbeddedValueResolver(EmbeddedValueResolver embeddedValueResolver) {
    ExpressionResolver.embeddedValueResolver = embeddedValueResolver;
}
 

@Before
public void setUp() {
    sut = new SpelResolver(new SpelExpressionParser(), new StandardReflectionParameterNameDiscoverer());
    sut.setEmbeddedValueResolver(new EmbeddedValueResolver(configurableBeanFactory));
}