Merge pull request #339 from purijatin/master

Mere caution about DefaultSqlSession

Author: emacarron

src/main/java/org/apache/ibatis/session/defaults/DefaultSqlSession.java

@@ -37,6 +37,10 @@
 import org.apache.ibatis.session.SqlSession;
 
 /**
+ * 
+ * Note: This class is not Thread-Safe. Only one thread at a time should access {@link DefaultSqlSession}.
+ * Refer docs concerning <a href="http://mybatis.github.io/mybatis-3/getting-started.html">SqlSession</a> for more info.
+ * 
  * @author Clinton Begin
  */
 public class DefaultSqlSession implements SqlSession {