add handler for speical case, ikey contains only special char '-' ' ' '.'

Author: XiaoliangHuang

core/src/main/java/com/microsoft/applicationinsights/telemetry/BaseTelemetry.java

@@ -21,7 +21,6 @@
 
 package com.microsoft.applicationinsights.telemetry;
 
-import com.microsoft.applicationinsights.agent.internal.common.StringUtils;
 import com.microsoft.applicationinsights.internal.schemav2.Data;
 import com.microsoft.applicationinsights.internal.schemav2.Domain;
 import com.microsoft.applicationinsights.internal.schemav2.Envelope;
@@ -34,6 +33,8 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
+import org.apache.commons.lang3.StringUtils;
+
 /**
  * Superclass for all telemetry data classes.
  */
@@ -192,7 +193,7 @@ protected String getBaseTypeName() {
     }
 
     private String normalizeInstrumentationKey(String instrumentationKey){
-    	if (StringUtils.isNullOrEmpty(instrumentationKey)){
+    	if (StringUtils.isEmpty(instrumentationKey) || StringUtils.containsOnly(instrumentationKey, ".- ")){
     		return "";
     	}
     	else{

core/src/test/java/com/microsoft/applicationinsights/telemetry/BaseTelemetryTest.java

@@ -30,7 +30,6 @@
 
 import java.io.IOException;
 import java.io.StringWriter;
-import java.lang.reflect.*;
 import java.util.Date;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
@@ -143,6 +142,21 @@ public void testTelemetryNameWithIkey() throws IOException{
         assertTrue(index != -1);
     }
 
+    @Test
+    public void testTelemetryNameWithIkey_SpecialChar() throws IOException{
+    	StubTelemetry telemetry = new StubTelemetry("Test Base Telemetry");
+    	telemetry.getContext().setInstrumentationKey("--. .--");
+    	telemetry.setTimestamp(new Date());
+    	
+        StringWriter writer = new StringWriter();
+        JsonTelemetryDataSerializer jsonWriter = new JsonTelemetryDataSerializer(writer);
+        telemetry.serialize(jsonWriter);
+        jsonWriter.close();
+        String asJson = writer.toString();
+
+        int index = asJson.indexOf("\"name\":\"Microsoft.ApplicationInsights.Stub\"");
+        assertTrue(index != -1);
+    }
 
     @Test
     public void testTelemetryNameWithIkey_Empty() throws IOException{