fix[zfoo]: maven compile warning

protocol/pom.xml

@@ -115,6 +115,14 @@
             </exclusions>
         </dependency>
 
+        <!--fix protobuf warning-->
+        <!-- Warning:java: 未知的枚举常量 javax.annotation.meta.When.MAYBE 原因: 找不到-->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
+
         <dependency>
             <groupId>com.esotericsoftware</groupId>
             <artifactId>kryo</artifactId>