https://lucene.apache.org/lucene-parent/lucene-analyzers-kuromoji: Lucene Kuromoji Japanese Morphological Analyzer (The Apache Software Foundation) 
public interface org.apache.lucene.analysis.ja.tokenattributes.BaseFormAttribute extends org.apache.lucene.util.Attribute
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.apache.lucene.analysis.ja.tokenattributes.BaseFormAttribute
  super_class: java.lang.Object
{
  public abstract java.lang.String getBaseForm();
    descriptor: ()Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void setToken(org.apache.lucene.analysis.ja.Token);
    descriptor: (Lorg/apache/lucene/analysis/ja/Token;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      token  
}
SourceFile: "BaseFormAttribute.java"