feat: Fixed 'Nullable'

The 'javax.annotation.Nullable' was, in fact, imported from 'com.google.code.findbugs:jsr305' which was a transitive Guava dependency.

We replace this annotation by the SpringFramework equivalent.

springwolf-core/src/main/java/io/github/stavshamir/springwolf/SpringWolfConfigProperties.java

@@ -11,7 +11,7 @@
 import org.springframework.boot.context.properties.NestedConfigurationProperty;
 import org.springframework.context.annotation.Configuration;
 
-import javax.annotation.Nullable;
+import org.springframework.lang.Nullable;
 import java.util.Map;
 
 @Configuration

springwolf-core/src/main/java/io/github/stavshamir/springwolf/configuration/DefaultAsyncApiDocketService.java

@@ -7,7 +7,7 @@
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
-import javax.annotation.Nullable;
+import org.springframework.lang.Nullable;
 import java.util.Optional;
 
 @Slf4j

springwolf-plugins/springwolf-amqp-plugin/src/main/java/io/github/stavshamir/springwolf/SpringWolfAmqpConfigProperties.java

@@ -6,7 +6,7 @@
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Configuration;
 
-import javax.annotation.Nullable;
+import org.springframework.lang.Nullable;
 
 import static io.github.stavshamir.springwolf.SpringWolfAmqpConfigConstants.SPRINGWOLF_AMQP_CONFIG_PREFIX;
 

springwolf-plugins/springwolf-kafka-plugin/src/main/java/io/github/stavshamir/springwolf/SpringWolfKafkaConfigProperties.java

@@ -8,7 +8,7 @@
 import org.springframework.boot.context.properties.NestedConfigurationProperty;
 import org.springframework.context.annotation.Configuration;
 
-import javax.annotation.Nullable;
+import org.springframework.lang.Nullable;
 
 import static io.github.stavshamir.springwolf.SpringWolfKafkaConfigConstants.SPRINGWOLF_KAFKA_CONFIG_PREFIX;
 

springwolf-plugins/springwolf-kafka-plugin/src/main/java/io/github/stavshamir/springwolf/asyncapi/scanners/channels/annotation/KafkaListenerUtil.java

@@ -12,7 +12,7 @@
 import org.springframework.kafka.annotation.KafkaListener;
 import org.springframework.util.StringValueResolver;
 
-import javax.annotation.Nullable;
+import org.springframework.lang.Nullable;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;