resolve ide compile warnings

common/common-protobuf/src/main/java/io/servicecomb/codec/protobuf/utils/ProtobufSchemaUtils.java

diff --git a/common/common-protobuf/src/main/java/io/servicecomb/codec/protobuf/utils/ProtobufSchemaUtils.java b/common/common-protobuf/src/main/java/io/servicecomb/codec/protobuf/utils/ProtobufSchemaUtils.java
index dd5911d..cf3f9e5 100644
--- a/common/common-protobuf/src/main/java/io/servicecomb/codec/protobuf/utils/ProtobufSchemaUtils.java
+++ b/common/common-protobuf/src/main/java/io/servicecomb/codec/protobuf/utils/ProtobufSchemaUtils.java
@@ -25,8 +25,6 @@
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
-import javax.lang.model.SourceVersion;
-
 import org.springframework.util.ClassUtils;
 
 import com.fasterxml.jackson.databind.JavaType;

swagger/swagger-generator/generator-core/src/main/java/io/servicecomb/swagger/generator/core/utils/ClassUtils.java

diff --git a/swagger/swagger-generator/generator-core/src/main/java/io/servicecomb/swagger/generator/core/utils/ClassUtils.java b/swagger/swagger-generator/generator-core/src/main/java/io/servicecomb/swagger/generator/core/utils/ClassUtils.java
index ca666e0..6364c38 100644
--- a/swagger/swagger-generator/generator-core/src/main/java/io/servicecomb/swagger/generator/core/utils/ClassUtils.java
+++ b/swagger/swagger-generator/generator-core/src/main/java/io/servicecomb/swagger/generator/core/utils/ClassUtils.java
@@ -19,16 +19,12 @@
 
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Method;
-import java.util.Arrays;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 
 import javax.lang.model.SourceVersion;
 
-import java.util.Set;
-
 import org.springframework.util.StringUtils;
 
 import com.fasterxml.jackson.databind.JavaType;