public void setDefaultExecutorType(ExecutorType defaultExecutorType) {
    this.defaultExecutorType = defaultExecutorType;
  }
Configuration factory class.
Used to create Configuration for loading deserialized unread properties.

@see <a href='https://code.google.com/p/mybatis/issues/detail?id=300'>Issue 300</a> (google code)
src/main/java/org/apache/ibatis/session/Configuration.java