Why Jersey doesn't honor the priorities in dynamically bind filters?

问题

I am using the DynamicFeature in Jersey to dynamically bind a container request filter to some particular resource methods. In addition to the DynamicFeature, I also have regular filters that apply to all resource methods. However, I found the priorities/orders of these filters not working as expected. For example:

public class MyDynamicFeature implements DynamicFeature {

    @Override
    public void configure(ResourceInfo resourceInfo, FeatureContext featureContext) {
        featureContext.register(MyDynamicFilter.class, 2);
    }
}

public class MyDynamicFilter implements ContainerRequestFilter {
    @Override
    public void filter(ContainerRequestContext containerRequestContext) throws IOException {
        System.out.println("Hey! I am dynamic!");
    }
}

public class MyStaticFilter implements ContainerRequestFilter {
    @Override
    public void filter(ContainerRequestContext containerRequestContext) throws IOException {
        System.out.println("Hey! I am static!");
    }
}

In the ResourceConfig, I register the DynamicFeature and filters with priorities:

register(MyDynamicFeature.class, 1);
register(MyStaticFilter.class, 3);

Ideally, if requests comes through the filters, I'd expect to see from the log:

Hey! I am dynamic!
Hey! I am static!

because the dynamic filter has a higher priority than the static one, but instead, I saw

Hey! I am static!
Hey! I am dynamic!

So it seems like dynamically bound filters always come at the end after the statically bound ones. Why doesn't it honor the priorities I set?

回答1:

Try to use javax.annotation.Priority annotations instead of the 2nd parameter in FeatureContext::register and ResourceConfig::register calls, which overrides the annotation.

@Priority(1)
public class MyDynamicFilter implements ContainerRequestFilter {
...
@Priority(2)
public class MyStaticFilter implements ContainerRequestFilter {
...
featureContext.register(MyDynamicFilter.class);
...
register(MyDynamicFeature.class);
register(MyStaticFilter.class);

And if that leads to the same problem, update your dependencies.

来源：https://stackoverflow.com/questions/34639434/why-jersey-doesnt-honor-the-priorities-in-dynamically-bind-filters