修复watch命令获取对象属性并发情况导致获取Field异常(NoSuchFieldException)

Author: zllVincent

core/src/main/java/com/taobao/arthas/core/command/express/OgnlExpress.java

@@ -33,7 +33,9 @@ public OgnlExpress(ClassResolver classResolver) {
     @Override
     public Object get(String express) throws ExpressException {
         try {
-            return Ognl.getValue(express, context, bindObject);
+            synchronized (express.intern()) {
+                return Ognl.getValue(express, context, bindObject);
+            }
         } catch (Exception e) {
             logger.error("Error during evaluating the expression:", e);
             throw new ExpressException(express, e);