sustain/src/main/java/net/happyonroad/spring/support/DefaultServiceRegistry.java
@Override
    public <T> T getService(Class<T> requiredType) {
        return getService(requiredType, ANY_HINT);
    }
@Override
    public <T> T getService(Class<T> requiredType) {
        return getService(requiredType, ANY_HINT);
    }
@ Override public < T > T getService ( Class < T > requiredType ) { return getService ( requiredType , ANY_HINT ) ; }
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