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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Unknown Source)	at java.util.Properties.setProperty(Unknown Source)	at org.apache.jmeter.util.SSLManager.getKeyStore(SSLManager.java:136)	at org.apache.jmeter.util.JsseSSLManager.getContext(JsseSSLManager.java:141)	at org.apache.jmeter.util.JsseSSLManager.(JsseSSLManager.java:88)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)	at java.lang.reflect.Constructor.newInstance(Unknown Source)	at org.apache.jmeter.util.SSLManager.getInstance(SSLManager.java:231)	at org.apache.jmeter.protocol.http.sampler.HTTPSampler.setupConnection(HTTPSampler.java:148)	at org.apache.jmeter.protocol.http.sampler.HTTPSampler.sample(HTTPSampler.java:404)	at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:658)	at org.apache.jmeter.protocol.http.proxy.Proxy.run(Proxy.java:112)