HTTP API displays warnings UTF_8, Scheme, ThreadSafeClientConnManager

I am a new java. I created a java project to call my web service (Servlet, Tomcat6.0).
To use http, I added the following jar files
1. httpclient-4.2.1
2. httpcore-4.2.1

For the methods (in bold) below, I get stale type warnings and cannot start the project.

HTTP.**UTF_8**
aSchemeRegistryL.register(new **Scheme**("http", PlainSocketFactory.getSocketFactory(), 80));
ClientConnectionManager ccm = new **ThreadSafeClientConnManager**(aHttpParamsL, aSchemeRegistryL);    

Help me fix this.