https://tomcat.apache.org/: JSP package 
public class javax.servlet.jsp.tagext.TagAdapter implements javax.servlet.jsp.tagext.Tag
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: javax.servlet.jsp.tagext.TagAdapter
  super_class: java.lang.Object
{
  private final javax.servlet.jsp.tagext.SimpleTag simpleTagAdaptee;
    descriptor: Ljavax/servlet/jsp/tagext/SimpleTag;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private javax.servlet.jsp.tagext.Tag parent;
    descriptor: Ljavax/servlet/jsp/tagext/Tag;
    flags: (0x0002) ACC_PRIVATE

  private boolean parentDetermined;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

  public void <init>(javax.servlet.jsp.tagext.SimpleTag);
    descriptor: (Ljavax/servlet/jsp/tagext/SimpleTag;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // javax.servlet.jsp.tagext.TagAdapter this
        start local 1 // javax.servlet.jsp.tagext.SimpleTag adaptee
         0: .line 52
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 53
            aload 1 /* adaptee */
            ifnonnull 3
         2: .line 55
            new java.lang.IllegalArgumentException
            dup
            invokespecial java.lang.IllegalArgumentException.<init>:()V
            athrow
         3: .line 57
      StackMap locals: javax.servlet.jsp.tagext.TagAdapter javax.servlet.jsp.tagext.SimpleTag
      StackMap stack:
            aload 0 /* this */
            aload 1 /* adaptee */
            putfield javax.servlet.jsp.tagext.TagAdapter.simpleTagAdaptee:Ljavax/servlet/jsp/tagext/SimpleTag;
         4: .line 58
            return
        end local 1 // javax.servlet.jsp.tagext.SimpleTag adaptee
        end local 0 // javax.servlet.jsp.tagext.TagAdapter this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    5     0     this  Ljavax/servlet/jsp/tagext/TagAdapter;
            0    5     1  adaptee  Ljavax/servlet/jsp/tagext/SimpleTag;
    MethodParameters:
         Name  Flags
      adaptee  

  public void setPageContext(javax.servlet.jsp.PageContext);
    descriptor: (Ljavax/servlet/jsp/PageContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // javax.servlet.jsp.tagext.TagAdapter this
        start local 1 // javax.servlet.jsp.PageContext pc
         0: .line 70
            new java.lang.UnsupportedOperationException
            dup
         1: .line 71
            ldc "Illegal to invoke setPageContext() on TagAdapter wrapper"
         2: .line 70
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // javax.servlet.jsp.PageContext pc
        end local 0 // javax.servlet.jsp.tagext.TagAdapter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Ljavax/servlet/jsp/tagext/TagAdapter;
            0    3     1    pc  Ljavax/servlet/jsp/PageContext;
    MethodParameters:
      Name  Flags
      pc    

  public void setParent(javax.servlet.jsp.tagext.Tag);
    descriptor: (Ljavax/servlet/jsp/tagext/Tag;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // javax.servlet.jsp.tagext.TagAdapter this
        start local 1 // javax.servlet.jsp.tagext.Tag parentTag
         0: .line 85
            new java.lang.UnsupportedOperationException
            dup
         1: .line 86
            ldc "Illegal to invoke setParent() on TagAdapter wrapper"
         2: .line 85
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // javax.servlet.jsp.tagext.Tag parentTag
        end local 0 // javax.servlet.jsp.tagext.TagAdapter this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    3     0       this  Ljavax/servlet/jsp/tagext/TagAdapter;
            0    3     1  parentTag  Ljavax/servlet/jsp/tagext/Tag;
    MethodParameters:
           Name  Flags
      parentTag  

  public javax.servlet.jsp.tagext.Tag getParent();
    descriptor: ()Ljavax/servlet/jsp/tagext/Tag;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // javax.servlet.jsp.tagext.TagAdapter this
         0: .line 99
            aload 0 /* this */
            getfield javax.servlet.jsp.tagext.TagAdapter.parentDetermined:Z
            ifne 8
         1: .line 100
            aload 0 /* this */
            getfield javax.servlet.jsp.tagext.TagAdapter.simpleTagAdaptee:Ljavax/servlet/jsp/tagext/SimpleTag;
            invokeinterface javax.servlet.jsp.tagext.SimpleTag.getParent:()Ljavax/servlet/jsp/tagext/JspTag;
            astore 1 /* adapteeParent */
        start local 1 // javax.servlet.jsp.tagext.JspTag adapteeParent
         2: .line 101
            aload 1 /* adapteeParent */
            ifnull 7
         3: .line 102
            aload 1 /* adapteeParent */
            instanceof javax.servlet.jsp.tagext.Tag
            ifeq 6
         4: .line 103
            aload 0 /* this */
            aload 1 /* adapteeParent */
            checkcast javax.servlet.jsp.tagext.Tag
            putfield javax.servlet.jsp.tagext.TagAdapter.parent:Ljavax/servlet/jsp/tagext/Tag;
         5: .line 104
            goto 7
         6: .line 106
      StackMap locals: javax.servlet.jsp.tagext.JspTag
      StackMap stack:
            aload 0 /* this */
            new javax.servlet.jsp.tagext.TagAdapter
            dup
            aload 1 /* adapteeParent */
            checkcast javax.servlet.jsp.tagext.SimpleTag
            invokespecial javax.servlet.jsp.tagext.TagAdapter.<init>:(Ljavax/servlet/jsp/tagext/SimpleTag;)V
            putfield javax.servlet.jsp.tagext.TagAdapter.parent:Ljavax/servlet/jsp/tagext/Tag;
         7: .line 109
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iconst_1
            putfield javax.servlet.jsp.tagext.TagAdapter.parentDetermined:Z
        end local 1 // javax.servlet.jsp.tagext.JspTag adapteeParent
         8: .line 112
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield javax.servlet.jsp.tagext.TagAdapter.parent:Ljavax/servlet/jsp/tagext/Tag;
            areturn
        end local 0 // javax.servlet.jsp.tagext.TagAdapter this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    9     0           this  Ljavax/servlet/jsp/tagext/TagAdapter;
            2    8     1  adapteeParent  Ljavax/servlet/jsp/tagext/JspTag;

  public javax.servlet.jsp.tagext.JspTag getAdaptee();
    descriptor: ()Ljavax/servlet/jsp/tagext/JspTag;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // javax.servlet.jsp.tagext.TagAdapter this
         0: .line 123
            aload 0 /* this */
            getfield javax.servlet.jsp.tagext.TagAdapter.simpleTagAdaptee:Ljavax/servlet/jsp/tagext/SimpleTag;
            areturn
        end local 0 // javax.servlet.jsp.tagext.TagAdapter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Ljavax/servlet/jsp/tagext/TagAdapter;

  public int doStartTag();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // javax.servlet.jsp.tagext.TagAdapter this
         0: .line 137
            new java.lang.UnsupportedOperationException
            dup
         1: .line 138
            ldc "Illegal to invoke doStartTag() on TagAdapter wrapper"
         2: .line 137
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // javax.servlet.jsp.tagext.TagAdapter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Ljavax/servlet/jsp/tagext/TagAdapter;
    Exceptions:
      throws javax.servlet.jsp.JspException

  public int doEndTag();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // javax.servlet.jsp.tagext.TagAdapter this
         0: .line 152
            new java.lang.UnsupportedOperationException
            dup
         1: .line 153
            ldc "Illegal to invoke doEndTag() on TagAdapter wrapper"
         2: .line 152
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // javax.servlet.jsp.tagext.TagAdapter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Ljavax/servlet/jsp/tagext/TagAdapter;
    Exceptions:
      throws javax.servlet.jsp.JspException

  public void release();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // javax.servlet.jsp.tagext.TagAdapter this
         0: .line 164
            new java.lang.UnsupportedOperationException
            dup
         1: .line 165
            ldc "Illegal to invoke release() on TagAdapter wrapper"
         2: .line 164
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // javax.servlet.jsp.tagext.TagAdapter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Ljavax/servlet/jsp/tagext/TagAdapter;
}
SourceFile: "TagAdapter.java"