package org.springframework.security.oauth2.common;
   
   import org.springframework.security.web.util.ThrowableAnalyzer;
   import org.springframework.security.web.util.ThrowableCauseExtractor;
   
   import javax.servlet.ServletException;
   
   /**
    * Default implementation of <code>ThrowableAnalyzer</code> which is capable of also unwrapping
   * <code>ServletException</code>s.
   */
  public final class DefaultThrowableAnalyzer extends ThrowableAnalyzer {
    /**
     * @see org.springframework.security.web.util.ThrowableAnalyzer#initExtractorMap()
     */
    protected void initExtractorMap() {
      super.initExtractorMap();
  
      registerExtractor(ServletException.class, new ThrowableCauseExtractor() {
        public Throwable extractCause(Throwable throwable) {
          ThrowableAnalyzer.verifyThrowableHierarchy(throwable, ServletException.class);
          return ((ServletException) throwable).getRootCause();
        }
      });
    }
  }