NPE thrown when starting and stopping siddhi app with multiple HTTP sources

[Niveathika]

Description:
$subject

Stacktrace

[2020-01-09 13:26:16,561] ERROR {io.siddhi.core.stream.input.source.Source} - Error on 'JsonInputMapper'. Error while connecting at Source 'http' at 'PersonalDetailsDefaultMapping'. java.lang.NullPointerException
	at io.siddhi.extension.io.http.source.HttpConnectorRegistry.createHttpServerConnector(HttpConnectorRegistry.java:218)
	at io.siddhi.extension.io.http.source.HttpSource.connect(HttpSource.java:418)
	at io.siddhi.core.stream.input.source.Source.connectWithRetry(Source.java:160)
	at io.siddhi.core.SiddhiAppRuntimeImpl.startSources(SiddhiAppRuntimeImpl.java:502)
	at io.siddhi.core.SiddhiAppRuntimeImpl.start(SiddhiAppRuntimeImpl.java:427)
	at io.siddhi.distribution.editor.core.internal.DebugRuntime.start(DebugRuntime.java:93)
	at io.siddhi.distribution.editor.core.internal.DebugProcessorService.start(DebugProcessorService.java:42)
	at io.siddhi.distribution.editor.core.internal.EditorMicroservice.start(EditorMicroservice.java:761)
	at io.siddhi.distribution.editor.core.internal.EditorMicroservice.startWithVariables(EditorMicroservice.java:781)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.wso2.msf4j.internal.router.HttpMethodInfo.invokeResource(HttpMethodInfo.java:187)
	at org.wso2.msf4j.internal.router.HttpMethodInfo.invoke(HttpMethodInfo.java:143)
	at org.wso2.msf4j.internal.MSF4JHttpConnectorListener.dispatchMethod(MSF4JHttpConnectorListener.java:218)
	at org.wso2.msf4j.internal.MSF4JHttpConnectorListener.lambda$onMessage$58(MSF4JHttpConnectorListener.java:129)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

Siddhi App:

/** 
{
    event : {
        "name" : "siddhi.user",
        "age" : "25"
        "address" : "20, Palm Groove, Colombo, Sri Lanka",
        "contact": "+9xxxxxxx1,+9xxxxxxx2"
    }
}
**/
@Source(type = 'http', receiver.url = 'http://localhost:8006/PersonalDetails', 
	@map(type = 'json'))
define stream PersonalDetailsDefaultMapping (name string, age int, address string, contact string);


/** 
{
    "name" : "siddhi.user",
    "age" : "25",
    "address" : {
        "number": "20",
        "lane": "Palm Groove",
        "city": "Colombo"
        "country": "Sri Lanka",
    },
    "contact": ["+9xxxxxxx1, +9xxxxxxx2"]
}
**/
@Source(type = 'http', receiver.url = 'http://localhost:8006/PersonalDetailsCustom', 
	@map(type = 'json', 
	       @attributes(name = 'name', age ='age', addressCountry = 'address.country', contact = 'contact[0]' ) ))
	       @sink(type='log') 
define stream PersonalDetailsCustomMapping (name string, age int, addressCountry string, contact string);


/** 
{
    person : [
                {
                    "name" : "siddhi.user",
                    "age" : "25",
                    "address" : {
                        "number": "20",
                        "lane": "Palm Groove",
                        "city": "Colombo"
                        "country": "Sri Lanka",
                    },
                    "contact": ["+9xxxxxxx1, +9xxxxxxx2"]
                }, 
                {
                    "name" : "siddhi.user",
                    "age" : "25",
                    "address" : {
                        "number": "20",
                        "lane": "Palm Groove",
                        "city": "Colombo"
                        "country": "Sri Lanka",
                    },
                    "contact": ["+9xxxxxxx1, +9xxxxxxx2"]
                }, 
                ]
                
}
**/
@Source(type = 'http', receiver.url = 'http://localhost:8006/PersonalDetailsMultiple', 
	@map(type = 'json', enclosing.element = 'person',
	       @attributes(name = 'name', age ='age', addressCountry = 'address.country', contact = 'contact' ) ))
	       @sink(type='log') 
define stream PersonalDetailsEnclosingElement (name string, age int, addressCountry string, contact string);

Affected Product Version:
Latest

OS, DB, other environment details and versions:
Siddhi tooling daily build 8/1/2020