fix null pointer exception if version cannot found

Author: Yang Guo

platform-agent/src/main/java/com/flow/platform/agent/CmdManager.java

@@ -240,6 +240,7 @@ private String collectionAgentInfo() {
         long total = runtime.totalMemory();
         long free = runtime.freeMemory();
         long use = total - free;
+
         Map<String, String> dic = new HashMap<>(7);
         dic.put("javaVersion", javaVersion);
         dic.put("osName", osName);
@@ -248,6 +249,7 @@ private String collectionAgentInfo() {
         dic.put("zone", Config.zone());
         dic.put("name", Config.name());
         dic.put("agentVersion", Config.getProperty("version"));
+
         return Jsonable.GSON_CONFIG.toJson(dic);
     }
 

platform-agent/src/main/java/com/flow/platform/agent/Config.java

@@ -20,6 +20,7 @@
 import com.flow.platform.domain.Jsonable;
 import com.flow.platform.util.ExceptionUtil;
 import com.flow.platform.util.Logger;
+import com.flow.platform.util.StringUtil;
 import com.flow.platform.util.http.HttpClient;
 import com.flow.platform.util.http.HttpResponse;
 import com.flow.platform.util.zk.ZKClient;
@@ -83,8 +84,8 @@ public static String getProperty(String name) {
                 properties = new Properties();
                 properties.load(fileInputStream);
             } catch (Throwable e) {
-                LOGGER.warn("get property from application.properties error %s",
-                    ExceptionUtil.findRootCause(e).getMessage());
+                LOGGER.error("Fail to load application.properties:", e);
+                return StringUtil.EMPTY;
             }
         }