fix trace command may not print result problem. #1817

core/src/main/java/com/taobao/arthas/core/command/monitor200/AbstractTraceAdviceListener.java

@@ -81,8 +81,11 @@ public class AbstractTraceAdviceListener extends AdviceListenerAdapter {
     private void finishing(ClassLoader loader, Advice advice) {
         // 本次调用的耗时
         TraceEntity traceEntity = threadLocalTraceEntity(loader);
-        double cost = threadLocalWatch.costInMillis();
-        if (--traceEntity.deep == 0) {
+        if (traceEntity.deep >= 1) { // #1817 防止deep为负数
+            traceEntity.deep--;
+        }
+        if (traceEntity.deep == 0) {
+            double cost = threadLocalWatch.costInMillis();
             try {
                 boolean conditionResult = isConditionMet(command.getConditionExpress(), advice, cost);
                 if (this.isVerbose()) {

core/src/main/java/com/taobao/arthas/core/command/monitor200/TraceEntity.java

@@ -18,14 +18,6 @@ public class TraceEntity {
         this.deep = 0;
     }
 
-    public int getDeep() {
-        return deep;
-    }
-
-    public void setDeep(int deep) {
-        this.deep = deep;
-    }
-
     private TraceTree createTraceTree(ClassLoader loader) {
         return new TraceTree(ThreadUtil.getThreadNode(loader, Thread.currentThread()));
     }