Issue resilience4j#596: The Spring Boot fallback method is not invoke…

…d when a BulkheadFullException occurs resilience4j#847

The ThreadPoolBulkhead is does not return a CompletionStage when a task could not be submitted, because the Bulkhead is full. The ThreadPoolBulkhead throws a BulkheadFullException instead. Analog to the ThreadPoolExecutor which throws the RejectedExecutionException. The BulkheadFullException is not handled correctly by the BulkheadAspect.
The BulkheadAspect should convert the BulkheadFullException into a exceptionally completed future so that the FallbackDecorator works as expected.

resilience4j-spring/src/main/java/io/github/resilience4j/bulkhead/configure/BulkheadAspect.java

@@ -15,6 +15,7 @@
  */
 package io.github.resilience4j.bulkhead.configure;
 
+import io.github.resilience4j.bulkhead.BulkheadFullException;
 import java.lang.reflect.Method;
 import java.lang.reflect.Proxy;
 import java.util.List;
@@ -23,7 +24,6 @@
 import java.util.concurrent.CompletionException;
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.ExecutionException;
-
 import org.aspectj.lang.ProceedingJoinPoint;
 import org.aspectj.lang.annotation.Around;
 import org.aspectj.lang.annotation.Aspect;