diff --git a/src/main/java/com/loafle/overflow/crawler/jmx/JmxCrawler.java b/src/main/java/com/loafle/overflow/crawler/jmx/JmxCrawler.java
index 404075c..8e01c56 100644
--- a/src/main/java/com/loafle/overflow/crawler/jmx/JmxCrawler.java
+++ b/src/main/java/com/loafle/overflow/crawler/jmx/JmxCrawler.java
@@ -53,7 +53,14 @@ public class JmxCrawler extends Crawler{
                 logCrawler(mbeanName, attr, "not readable");
                 continue;
             }
-            Object att = beanCon.getAttribute(mbeanName, attr.getName());
+            Object att = null;
+
+            try {
+                att = beanCon.getAttribute(mbeanName, attr.getName());
+            }catch (Exception e) {
+                e.printStackTrace();
+            }
+
             if (att != null)
                 returnMap.put(attr.getName(), att.toString());
         }
diff --git a/src/test/java/com/loafle/AppTest.java b/src/test/java/com/loafle/AppTest.java
index df3c33c..f6d5d93 100644
--- a/src/test/java/com/loafle/AppTest.java
+++ b/src/test/java/com/loafle/AppTest.java
@@ -25,7 +25,7 @@ public class AppTest {
 
         ClassLoader classLoader = getClass().getClassLoader();
         URL url = classLoader.getResource("config/");
-        String path = classLoader.getResource("config/example.json").getFile();
+        String path = classLoader.getResource("config/example1.json").getFile();
 
         ObjectMapper mapper = new ObjectMapper();
         Config c = mapper.readValue(new File(path),Config.class);
@@ -34,7 +34,6 @@ public class AppTest {
         List<OFResultSet> result = (List<OFResultSet>) cr.getInternal(c);
 
         print("",result);
-
     }
 
     private void print(String s, List<OFResultSet> mm) {
diff --git a/src/test/resources/config/example1.json b/src/test/resources/config/example1.json
new file mode 100644
index 0000000..8b479e9
--- /dev/null
+++ b/src/test/resources/config/example1.json
@@ -0,0 +1,68 @@
+{
+  "id" : "SOEJWEOJWOEJOSDJFOASDJFOSDFO2903870928734",
+  "target" : {
+    "connection" : {
+      "ip" : "192.168.1.103",
+      "port" : "9840",
+      "ssl" : false,
+      "portType" : "tcp"
+    },
+    "auth" : {
+
+    }
+  },
+  "schedule" : {
+    "interval" : "10"
+  },
+  "crawler" : {
+    "name":"jmx",
+    "container":"java_proxy"
+  },
+  "items" : [
+    {
+      "keys" : [
+        {"metric" : "net.connector[$0].maxThreads",           "key" : "maxThreads"},
+        {"metric" : "net.connector[$0].currentThreadCount",   "key" : "currentThreadCount"},
+        {"metric" : "net.connector[$0].currentThreadsBusy",   "key" : "currentThreadsBusy"}
+      ],
+      "queryInfo" : {
+        "query": "*Catalina:type=ThreadPool,*",
+        "extend" : {
+          "aliases" : [
+            {
+              "key": "Catalina:type",
+              "index":0
+            }
+          ]
+        }
+      },
+      "mappingInfo" : {
+        "arrayColumns" : [ "ThreadPool" ]
+      }
+    },
+    {
+      "keys" : [
+        {"metric" : "net.connector[$0].bytesSent",            "key" : "bytesSent"},
+        {"metric" : "net.connector[$0].bytesReceived",        "key" : "bytesReceived"},
+        {"metric" : "net.connector[$0].errorCount",           "key" : "errorCount"},
+        {"metric" : "net.connector[$0].requestCount",         "key" : "requestCount"},
+        {"metric" : "net.connector[$0].maxTime",              "key" : "maxTime"},
+        {"metric" : "net.connector[$0].processingTime",       "key" : "processingTime"}
+      ],
+      "queryInfo" : {
+        "query": "*Catalina:type=GlobalRequestProcessor,*",
+        "extend" : {
+          "aliases" : [
+            {
+              "key": "Catalina:type",
+              "index":0
+            }
+          ]
+        }
+      },
+      "mappingInfo" : {
+        "arrayColumns" : [ "GlobalRequestProcessor" ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/src/test/resources/config/example2.json b/src/test/resources/config/example2.json
new file mode 100644
index 0000000..c9a1f89
--- /dev/null
+++ b/src/test/resources/config/example2.json
@@ -0,0 +1,47 @@
+{
+  "id" : "SOEJWEOJWOEJOSDJFOASDJFOSDFO2903870928734",
+  "target" : {
+    "connection" : {
+      "ip" : "192.168.1.103",
+      "port" : "9840",
+      "ssl" : false,
+      "portType" : "tcp"
+    },
+    "auth" : {
+
+    }
+  },
+  "schedule" : {
+    "interval" : "10"
+  },
+  "crawler" : {
+    "name":"jmx",
+    "container":"java_proxy"
+  },
+  "items" : [
+    {
+      "keys" : [
+        {"metric" : "net.connector[$1].bytesSent",            "key" : "bytesSent"},
+        {"metric" : "net.connector[$1].bytesReceived",        "key" : "bytesReceived"},
+        {"metric" : "net.connector[$1].errorCount",           "key" : "errorCount"},
+        {"metric" : "net.connector[$1].requestCount",         "key" : "requestCount"},
+        {"metric" : "net.connector[$1].maxTime",              "key" : "maxTime"},
+        {"metric" : "net.connector[$1].processingTime",       "key" : "processingTime"}
+      ],
+      "queryInfo" : {
+        "query": "*Catalina:j2eeType=GlobalRequestProcessor,*",
+        "extend" : {
+          "aliases" : [
+            {
+              "key": "Catalina:type",
+              "index":1
+            }
+          ]
+        }
+      },
+      "mappingInfo" : {
+        "arrayColumns" : [ "GlobalRequestProcessor" ]
+      }
+    }
+  ]
+}
\ No newline at end of file