JIRA: https://jira.spring.io/browse/INT-3749
Since `IntegrationEvaluationContextAware` isn't so "context-free" resource like `BeanFactory`
and `ApplicationContext`, but just a specific bean in the context, we can't follow with `BeanPostProcessor` logic - bad architecture by level of responsibility.
Therefore we should follow with standard Dependency Injection mechanism to retrieve `evaluationContext` for the particular component.
Since we can't rely on the `@Autowired` because SI can be used from the raw XML configuration,
we use utility method instead. The pattern to get the proper `integrationEvaluationContext` is:
```
@Override
protected void onInit() throws Exception {
super.onInit();
this.evaluationContext = ExpressionUtils.createStandardEvaluationContext(getBeanFactory());
}
```
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