android - Null pointer excpetion on intent creation -


i've got error i've never had before : when i'm using following 

intent intent = new intent().setclass(this, research.class);

i've got nullpointerexception... research.class not null , "this" neighter... research class in different package, problematic ? different package same projet.

my stack trace : 

java.lang.nullpointerexception  @ android.content.contextwrapper.getpackagename(contextwrapper.java:135)  @ android.content.componentname.<init>(componentname.java:75)   @ android.content.intent.<init>(intent.java:3491)  @ mypackage.connect.disconnect(connect.java:92), , line 92 1 posted.

i've imported class needed intent , it's declared in manifest.xml.

try this:

intent intent = new intent(this, research.class);

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