http://nexus.sonatype.org/oss-repository-hosting.html/ST4: StringTemplate is a java template engine for generating source code, web pages, emails, or any other formatted text output. StringTemplate is particularly good at multi-targeted code generators, multiple site skins, and internationalization/localization. It evolved over years of effort developing jGuru.com. StringTemplate also powers the ANTLR 3 and 4 code generator. Its distinguishing characteristic is that unlike other engines, it strictly enforces model-view separation. Strict separation makes websites and code generators more flexible and maintainable; it also provides an excellent defense against malicious template authors. 
public class org.stringtemplate.v4.misc.MultiMap<K, V> extends java.util.LinkedHashMap<K, java.util.List<V>>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.stringtemplate.v4.misc.MultiMap
  super_class: java.util.LinkedHashMap
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.stringtemplate.v4.misc.MultiMap this
         0: .line 33
            aload 0 /* this */
            invokespecial java.util.LinkedHashMap.<init>:()V
            return
        end local 0 // org.stringtemplate.v4.misc.MultiMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/stringtemplate/v4/misc/MultiMap<TK;TV;>;

  public void map(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // org.stringtemplate.v4.misc.MultiMap this
        start local 1 // java.lang.Object key
        start local 2 // java.lang.Object value
         0: .line 35
            aload 0 /* this */
            aload 1 /* key */
            invokevirtual org.stringtemplate.v4.misc.MultiMap.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.util.List
            astore 3 /* elementsForKey */
        start local 3 // java.util.List elementsForKey
         1: .line 36
            aload 3 /* elementsForKey */
            ifnonnull 4
         2: .line 37
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            astore 3 /* elementsForKey */
         3: .line 38
            aload 0 /* this */
            aload 1 /* key */
            aload 3 /* elementsForKey */
            invokespecial java.util.LinkedHashMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         4: .line 40
      StackMap locals: java.util.List
      StackMap stack:
            aload 3 /* elementsForKey */
            aload 2 /* value */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         5: .line 41
            return
        end local 3 // java.util.List elementsForKey
        end local 2 // java.lang.Object value
        end local 1 // java.lang.Object key
        end local 0 // org.stringtemplate.v4.misc.MultiMap this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    6     0            this  Lorg/stringtemplate/v4/misc/MultiMap<TK;TV;>;
            0    6     1             key  TK;
            0    6     2           value  TV;
            1    6     3  elementsForKey  Ljava/util/List<TV;>;
    Signature: (TK;TV;)V
    MethodParameters:
       Name  Flags
      key    
      value  
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/util/LinkedHashMap<TK;Ljava/util/List<TV;>;>;
SourceFile: "MultiMap.java"