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Custom Rules in Checkstyle for ensuring Logger is declared as a Static Final Class Attribute
package com.mystuff.checkstyle.hecks;

import com.puppycrawl.tools.checkstyle.api.Check;
import com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.FullIdent;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;
import com.puppycrawl.tools.checkstyle.checks.CheckUtils;

/**
 *
 *
 * This package provides the custom checks that were required outside
 * of the standard checks provided
 *
 */
public class LoggerAttrCheck extends Check
{
   /**
    *
    *
    * The Logger must be declared as a static final class attribute
    *
    */
    @Override
    public int[] getDefaultTokens()
    {
        return new int[] { TokenTypes.VARIABLE_DEF};
    }

    @Override
    public void visitToken(DetailAST aAST)
    {
        if(aAST.getType()==TokenTypes.VARIABLE_DEF)
          visitVariableDef(aAST);

    }
    /**
     * Checks type of given variable.
     * @param aAST variable to check.
     */
    private void visitVariableDef(DetailAST aAST)
    {
        checkVariableDefn(aAST);
    }

    /**
     *
     * Checks variable to see if its a Logger and static final
     *      * @param aAST node to check.
     */
    private void checkVariableDefn(DetailAST aAST)
    {
        final DetailAST type = aAST.findFirstToken(TokenTypes.TYPE);
        final FullIdent ident = CheckUtils.createFullType(type);

        if ((ident.getText().equals("Logger")))
        {
              if((!aAST.branchContains(TokenTypes.FINAL))||(!aAST.branchContainsTokenTypes.LITERAL_STATIC)))
          {
          log(type.getLineNo(), type.getColumnNo(),
                    "Logger not defined as static final class attribute", type.getText());
          }
        }
    }
}

<?xml version="1.0" encoding="UTF-8"?>

    <!DOCTYPE checkstyle-packages PUBLIC
    "-//Puppy Crawl//DTD Package Names 1.3//EN"
    "http://www.puppycrawl.com/dtds/packages_1_3.dtd">

<checkstyle-packages>
    <package name="com.mystuff.checkstyle.checks"/>
</checkstyle-packages>