diff --git a/rxlib/src/main/java/org/rx/core/Reflects.java b/rxlib/src/main/java/org/rx/core/Reflects.java
index 3f16bfeb..aab429a9 100644
--- a/rxlib/src/main/java/org/rx/core/Reflects.java
+++ b/rxlib/src/main/java/org/rx/core/Reflects.java
@@ -58,11 +58,21 @@ static class ConvertBean<TS, TT> {
         final TripleFunc<TS, Class<TT>, TT> converter;
     }
 
-    static class SecurityManagerEx extends SecurityManager {
+    public interface ClassTracer {
+        Class<?>[] getClassTrace();
+
+        Class<?> getClassTrace(int depth);
+    }
+
+    static class SecurityManagerEx extends SecurityManager implements ClassTracer {
         static final SecurityManagerEx INSTANCE = new SecurityManagerEx();
 
-        Class<?> stackClass(int depth) {
-            return getClassContext()[depth];
+        public Class<?>[] getClassTrace() {
+            return getClassContext();
+        }
+
+        public Class<?> getClassTrace(int depth) {
+            return getClassContext()[1 + depth];
         }
     }
     //endregion
@@ -70,6 +80,7 @@ Class<?> stackClass(int depth) {
     public static final Linq<String> COLLECTION_WRITE_METHOD_NAMES = Linq.from("add", "remove", "addAll", "removeAll", "removeIf", "retainAll", "clear"),
             List_WRITE_METHOD_NAMES = COLLECTION_WRITE_METHOD_NAMES.union(Arrays.toList("replaceAll", "set"));
     public static final Set<Method> OBJECT_METHODS = Collections.unmodifiableSet(new HashSet<>(Arrays.toList(Object.class.getMethods())));
+    public static final ClassTracer CLASS_TRACER = new SecurityManagerEx();
     static final String M_0 = "close", CHANGE_TYPE_METHOD = "valueOf";
     static final String GET_PROPERTY = "get", GET_BOOL_PROPERTY = "is", SET_PROPERTY = "set";
     static final String TYPED_JSON_KEY = "$rxType";
@@ -123,7 +134,7 @@ public static Class<?> getCallerClass() {
 
     public static Class<?> stackClass(int depth) {
         //Throwable.class.getDeclaredMethod("getStackTraceElement", int.class) & Reflection.getCallerClass(2 + depth) java 11 not exist
-        return SecurityManagerEx.INSTANCE.stackClass(2 + depth);
+        return SecurityManagerEx.INSTANCE.getClassTrace()[2 + depth];
     }
 
     public static InputStream getResource(String namePattern) {
diff --git a/rxlib/src/main/java/org/rx/core/ThreadPool.java b/rxlib/src/main/java/org/rx/core/ThreadPool.java
index e17a81ec..6fb7594b 100644
--- a/rxlib/src/main/java/org/rx/core/ThreadPool.java
+++ b/rxlib/src/main/java/org/rx/core/ThreadPool.java
@@ -179,7 +179,7 @@ private Task(Func<T> fn, FlagsEnum<RunFlag> flags, Object id) {
             }
             if (conf.trace.slowMethodElapsedMicros > 0) {
                 //Reflects.getStackTrace(t)
-                caller = Reflects.getCallerClass();
+                caller = Reflects.CLASS_TRACER.getClassTrace(0);
             } else {
                 caller = null;
             }
@@ -205,7 +205,7 @@ public T call() {
                     throw e;
                 } finally {
                     Thread t = Thread.currentThread();
-                    TraceHandler.INSTANCE.saveMethodTrace(t, ifNull(caller, ThreadPool.class), fn.getClass().getName(), id == null ? null : new Object[]{id},
+                    TraceHandler.INSTANCE.saveMethodTrace(t, ifNull(caller, ThreadPool.class), fn.getClass().getSimpleName(), id == null ? null : new Object[]{id},
                             r, ex, System.nanoTime() - s);
                 }
                 return r;
diff --git a/rxlib/src/test/java/org/rx/core/TestCore.java b/rxlib/src/test/java/org/rx/core/TestCore.java
index e15cacf1..3f9de77b 100644
--- a/rxlib/src/test/java/org/rx/core/TestCore.java
+++ b/rxlib/src/test/java/org/rx/core/TestCore.java
@@ -999,7 +999,8 @@ public void reflect() {
             System.out.println(resource);
             assert resource != null;
         }
-        assert Reflects.stackClass(0) == this.getClass();
+        System.out.println(toJsonString(Reflects.CLASS_TRACER.getClassTrace()));
+        assert Reflects.CLASS_TRACER.getClassTrace(0) == this.getClass();
 //        for (StackTraceElement traceElement : Reflects.stackTrace(8)) {
 //            System.out.println(traceElement);
 //        }