diff --git a/bootstrap-core/src/main/java/com/navercorp/pinpoint/bootstrap/interceptor/SpanAsyncEventSimpleAroundInterceptor.java b/bootstrap-core/src/main/java/com/navercorp/pinpoint/bootstrap/interceptor/SpanAsyncEventSimpleAroundInterceptor.java
index b54adea42..f500cea93 100644
--- a/bootstrap-core/src/main/java/com/navercorp/pinpoint/bootstrap/interceptor/SpanAsyncEventSimpleAroundInterceptor.java
+++ b/bootstrap-core/src/main/java/com/navercorp/pinpoint/bootstrap/interceptor/SpanAsyncEventSimpleAroundInterceptor.java
@@ -14,7 +14,7 @@ import com.navercorp.pinpoint.common.trace.ServiceType;
 public abstract class SpanAsyncEventSimpleAroundInterceptor implements AroundInterceptor {
     protected final PLogger logger = PLoggerFactory.getLogger(getClass());
     protected final boolean isDebug = logger.isDebugEnabled();
-    protected final String SCOPE_NAME = "##ASYNC_TRACE_SCOPE";
+    protected static final String SCOPE_NAME = "##ASYNC_TRACE_SCOPE";
 
     protected final MethodDescriptor methodDescriptor;
     protected final TraceContext traceContext;
diff --git a/plugins/okhttp/src/main/java/com/navercorp/pinpoint/plugin/okhttp/interceptor/DispatcherEnqueueMethodInterceptor.java b/plugins/okhttp/src/main/java/com/navercorp/pinpoint/plugin/okhttp/interceptor/DispatcherEnqueueMethodInterceptor.java
index f3a185506..d2edc743d 100644
--- a/plugins/okhttp/src/main/java/com/navercorp/pinpoint/plugin/okhttp/interceptor/DispatcherEnqueueMethodInterceptor.java
+++ b/plugins/okhttp/src/main/java/com/navercorp/pinpoint/plugin/okhttp/interceptor/DispatcherEnqueueMethodInterceptor.java
@@ -38,7 +38,6 @@ public class DispatcherEnqueueMethodInterceptor implements AroundInterceptor {
 
     private TraceContext traceContext;
     private MethodDescriptor methodDescriptor;
-    private InterceptorScope interceptorScope;
 
     public DispatcherEnqueueMethodInterceptor(TraceContext traceContext, MethodDescriptor methodDescriptor) {
         this.traceContext = traceContext;
diff --git a/plugins/okhttp/src/main/java/com/navercorp/pinpoint/plugin/okhttp/interceptor/HttpEngineReadResponseMethodInterceptor.java b/plugins/okhttp/src/main/java/com/navercorp/pinpoint/plugin/okhttp/interceptor/HttpEngineReadResponseMethodInterceptor.java
index faaa8c1e8..422c5250f 100644
--- a/plugins/okhttp/src/main/java/com/navercorp/pinpoint/plugin/okhttp/interceptor/HttpEngineReadResponseMethodInterceptor.java
+++ b/plugins/okhttp/src/main/java/com/navercorp/pinpoint/plugin/okhttp/interceptor/HttpEngineReadResponseMethodInterceptor.java
@@ -36,7 +36,6 @@ public class HttpEngineReadResponseMethodInterceptor implements AroundIntercepto
 
     private TraceContext traceContext;
     private MethodDescriptor methodDescriptor;
-    private InterceptorScope interceptorScope;
     private final boolean statusCode;
 
     public HttpEngineReadResponseMethodInterceptor(TraceContext traceContext, MethodDescriptor methodDescriptor, boolean statusCode) {
diff --git a/web/src/main/java/com/navercorp/pinpoint/web/scatter/ScatterData.java b/web/src/main/java/com/navercorp/pinpoint/web/scatter/ScatterData.java
index a406bb1a5..6a0e26f64 100644
--- a/web/src/main/java/com/navercorp/pinpoint/web/scatter/ScatterData.java
+++ b/web/src/main/java/com/navercorp/pinpoint/web/scatter/ScatterData.java
@@ -186,7 +186,7 @@ public class ScatterData {
         return latestAcceptedTime;
     }
 
-    private class XCoordinatesComparator implements Comparator<Long> {
+    private static class XCoordinatesComparator implements Comparator<Long> {
 
         @Override
         public int compare(Long o1, Long o2) {