diff --git a/src/main/java/cn/wanghw/Main.java b/src/main/java/cn/wanghw/Main.java
index 0073fe3..e9b78b1 100644
--- a/src/main/java/cn/wanghw/Main.java
+++ b/src/main/java/cn/wanghw/Main.java
@@ -31,6 +31,7 @@ public static void main(String[] args) {
             new PropertySource01(),
             new PropertySource02(),
             new PropertySource03(),
+            new PropertySource04(),
             new OSS01()
     };
 
diff --git a/src/main/java/cn/wanghw/spider/PropertySource04.java b/src/main/java/cn/wanghw/spider/PropertySource04.java
new file mode 100644
index 0000000..0972459
--- /dev/null
+++ b/src/main/java/cn/wanghw/spider/PropertySource04.java
@@ -0,0 +1,56 @@
+package cn.wanghw.spider;
+
+import cn.wanghw.ISpider;
+import cn.wanghw.utils.OQLSnippets;
+import org.graalvm.visualvm.lib.jfluid.heap.Heap;
+import org.graalvm.visualvm.lib.profiler.oql.engine.api.OQLEngine;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+public class PropertySource04 implements ISpider {
+
+    @Override
+    public String getName() {
+        return "ConsulPropertySources";
+    }
+
+    @Override
+    public String sniff(Heap heap) {
+        final String[] result = {""};
+        long currentObjId = 0;
+        try {
+            List<Long> listObjId = new ArrayList<>();
+            OQLEngine oqlEngine = new OQLEngine(heap);
+            oqlEngine.executeQuery(OQLSnippets.getTable + OQLSnippets.isMap + "map(filter(map(filter(map(heap.objects('org.springframework.cloud.consul.config.ConsulPropertySource'), 'it.properties'), 'isMap(it)'), 'getTable(it)'), 'it != null'), 'it.id');", o -> {
+                if (o instanceof Long) {
+                    listObjId.add((Long) o);
+                }
+                return false;
+            });
+            List<String> seenKeys = new ArrayList<>();
+            for (Long objId : listObjId) {
+                currentObjId = objId;
+                oqlEngine.executeQuery(OQLSnippets.getValue + "map(filter(map(heap.findObject(" + objId.toString() + "), 'it'), 'it != null'), \"{'key': getValue(it.key),'value':getValue(it.value)}\")", o -> {
+                    if (o instanceof HashMap) {
+                        HashMap<String, String> hashMap = (HashMap<String, String>) o;
+                        String key = hashMap.get("key");
+                        if (!seenKeys.contains(key)) {
+                            result[0] += hashMap.get("key") + " = " + hashMap.get("value") + "\r\n";
+                            seenKeys.add(hashMap.get("key"));
+                        }
+                    }
+                    return false;
+                });
+            }
+        } catch (Exception ex) {
+            if (result[0].equals("") && ex.getMessage().contains("is not found!")) {
+                result[0] = "not found!\r\n";
+            } else {
+                System.out.println(ex + " objId: " + currentObjId);
+            }
+        }
+        return result[0];
+    }
+}
diff --git a/src/main/java/cn/wanghw/utils/OQLSnippets.java b/src/main/java/cn/wanghw/utils/OQLSnippets.java
index f9c9c82..72e0633 100644
--- a/src/main/java/cn/wanghw/utils/OQLSnippets.java
+++ b/src/main/java/cn/wanghw/utils/OQLSnippets.java
@@ -7,8 +7,8 @@ public class OQLSnippets {
             "}\n";
     public static final String getValue = isNullOrUndefined +
             "function getValue(val) {\n" +
-            "    if (!isNullOrUndefined(val)) {\n" +
-            "        if (classof(val) == undefined || classof(val).name == \"java.lang.String\") {\n" +
+            "    if (val != null && !isNullOrUndefined(val)) {\n" +
+            "        if (unwrapJavaObject(val) != null && (classof(val) == undefined || classof(val).name == \"java.lang.String\") ) {\n" +
             "            return val.toString();\n" +
             "        } else if (!isNullOrUndefined(val.str)) {\n" +
             "            return val.str.toString();\n" +