https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
final class com.google.common.collect.Platform
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.collect.Platform
  super_class: java.lang.Object
{
  private static final java.util.logging.Logger logger;
    descriptor: Ljava/util/logging/Logger;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 33
            ldc Lcom/google/common/collect/Platform;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokestatic java.util.logging.Logger.getLogger:(Ljava/lang/String;)Ljava/util/logging/Logger;
         1: .line 32
            putstatic com.google.common.collect.Platform.logger:Ljava/util/logging/Logger;
         2: .line 33
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  static <K, V> java.util.Map<K, V> newHashMapWithExpectedSize(int);
    descriptor: (I)Ljava/util/Map;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // int expectedSize
         0: .line 37
            iload 0 /* expectedSize */
            invokestatic com.google.common.collect.Maps.newHashMapWithExpectedSize:(I)Ljava/util/HashMap;
            areturn
        end local 0 // int expectedSize
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    1     0  expectedSize  I
    Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>(I)Ljava/util/Map<TK;TV;>;
    MethodParameters:
              Name  Flags
      expectedSize  

  static <K, V> java.util.Map<K, V> newLinkedHashMapWithExpectedSize(int);
    descriptor: (I)Ljava/util/Map;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // int expectedSize
         0: .line 45
            iload 0 /* expectedSize */
            invokestatic com.google.common.collect.Maps.newLinkedHashMapWithExpectedSize:(I)Ljava/util/LinkedHashMap;
            areturn
        end local 0 // int expectedSize
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    1     0  expectedSize  I
    Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>(I)Ljava/util/Map<TK;TV;>;
    MethodParameters:
              Name  Flags
      expectedSize  

  static <E> java.util.Set<E> newHashSetWithExpectedSize(int);
    descriptor: (I)Ljava/util/Set;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // int expectedSize
         0: .line 50
            iload 0 /* expectedSize */
            invokestatic com.google.common.collect.Sets.newHashSetWithExpectedSize:(I)Ljava/util/HashSet;
            areturn
        end local 0 // int expectedSize
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    1     0  expectedSize  I
    Signature: <E:Ljava/lang/Object;>(I)Ljava/util/Set<TE;>;
    MethodParameters:
              Name  Flags
      expectedSize  

  static <E> java.util.Set<E> newLinkedHashSetWithExpectedSize(int);
    descriptor: (I)Ljava/util/Set;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // int expectedSize
         0: .line 58
            iload 0 /* expectedSize */
            invokestatic com.google.common.collect.Sets.newLinkedHashSetWithExpectedSize:(I)Ljava/util/LinkedHashSet;
            areturn
        end local 0 // int expectedSize
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    1     0  expectedSize  I
    Signature: <E:Ljava/lang/Object;>(I)Ljava/util/Set<TE;>;
    MethodParameters:
              Name  Flags
      expectedSize  

  static <K, V> java.util.Map<K, V> preservesInsertionOrderOnPutsMap();
    descriptor: ()Ljava/util/Map;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 66
            invokestatic com.google.common.collect.Maps.newLinkedHashMap:()Ljava/util/LinkedHashMap;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>()Ljava/util/Map<TK;TV;>;

  static <E> java.util.Set<E> preservesInsertionOrderOnAddsSet();
    descriptor: ()Ljava/util/Set;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 74
            invokestatic com.google.common.collect.Sets.newLinkedHashSet:()Ljava/util/LinkedHashSet;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <E:Ljava/lang/Object;>()Ljava/util/Set<TE;>;

  static <T> T[] newArray(T[], );
    descriptor: ([Ljava/lang/Object;I)[Ljava/lang/Object;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=4, args_size=2
        start local 0 // java.lang.Object[] reference
        start local 1 // int length
         0: .line 84
            aload 0 /* reference */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getComponentType:()Ljava/lang/Class;
            astore 2 /* type */
        start local 2 // java.lang.Class type
         1: .line 89
            aload 2 /* type */
            iload 1 /* length */
            invokestatic java.lang.reflect.Array.newInstance:(Ljava/lang/Class;I)Ljava/lang/Object;
            checkcast java.lang.Object[]
            astore 3 /* result */
        start local 3 // java.lang.Object[] result
         2: .line 90
            aload 3 /* result */
            areturn
        end local 3 // java.lang.Object[] result
        end local 2 // java.lang.Class type
        end local 1 // int length
        end local 0 // java.lang.Object[] reference
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    3     0  reference  [Ljava/lang/Object;
            0    3     1     length  I
            1    3     2       type  Ljava/lang/Class<*>;
            2    3     3     result  [Ljava/lang/Object;
    Signature: <T:Ljava/lang/Object;>([TT;I)[TT;
    MethodParameters:
           Name  Flags
      reference  
      length     

  static <T> T[] copy([], int, int, );
    descriptor: ([Ljava/lang/Object;II[Ljava/lang/Object;)[Ljava/lang/Object;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // java.lang.Object[] source
        start local 1 // int from
        start local 2 // int to
        start local 3 // java.lang.Object[] arrayOfType
         0: .line 95
            aload 0 /* source */
            iload 1 /* from */
            iload 2 /* to */
            aload 3 /* arrayOfType */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokestatic java.util.Arrays.copyOfRange:([Ljava/lang/Object;IILjava/lang/Class;)[Ljava/lang/Object;
            areturn
        end local 3 // java.lang.Object[] arrayOfType
        end local 2 // int to
        end local 1 // int from
        end local 0 // java.lang.Object[] source
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    1     0       source  [Ljava/lang/Object;
            0    1     1         from  I
            0    1     2           to  I
            0    1     3  arrayOfType  [Ljava/lang/Object;
    Signature: <T:Ljava/lang/Object;>([Ljava/lang/Object;II[TT;)[TT;
    MethodParameters:
             Name  Flags
      source       
      from         
      to           
      arrayOfType  

  static com.google.common.collect.MapMaker tryWeakKeys(com.google.common.collect.MapMaker);
    descriptor: (Lcom/google/common/collect/MapMaker;)Lcom/google/common/collect/MapMaker;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMaker mapMaker
         0: .line 104
            aload 0 /* mapMaker */
            invokevirtual com.google.common.collect.MapMaker.weakKeys:()Lcom/google/common/collect/MapMaker;
            areturn
        end local 0 // com.google.common.collect.MapMaker mapMaker
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0  mapMaker  Lcom/google/common/collect/MapMaker;
    MethodParameters:
          Name  Flags
      mapMaker  

  static int reduceIterationsIfGwt(int);
    descriptor: (I)I
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // int iterations
         0: .line 108
            iload 0 /* iterations */
            ireturn
        end local 0 // int iterations
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    1     0  iterations  I
    MethodParameters:
            Name  Flags
      iterations  

  static int reduceExponentIfGwt(int);
    descriptor: (I)I
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // int exponent
         0: .line 112
            iload 0 /* exponent */
            ireturn
        end local 0 // int exponent
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0  exponent  I
    MethodParameters:
          Name  Flags
      exponent  

  static void checkGwtRpcEnabled();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=7, locals=1, args_size=0
         0: .line 116
            ldc "guava.gwt.emergency_reenable_rpc"
            astore 0 /* propertyName */
        start local 0 // java.lang.String propertyName
         1: .line 118
            aload 0 /* propertyName */
            ldc "false"
            invokestatic java.lang.System.getProperty:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            invokestatic java.lang.Boolean.parseBoolean:(Ljava/lang/String;)Z
            ifne 9
         2: .line 119
            new java.lang.UnsupportedOperationException
            dup
         3: .line 121
            ldc "We are removing GWT-RPC support for Guava types. You can temporarily reenable support by setting the system property %s to true. For more about system properties, see %s. For more about Guava's GWT-RPC support, see %s."
            iconst_3
            anewarray java.lang.Object
            dup
            iconst_0
         4: .line 124
            aload 0 /* propertyName */
            aastore
            dup
            iconst_1
         5: .line 125
            ldc "https://stackoverflow.com/q/5189914/28465"
            aastore
            dup
            iconst_2
         6: .line 126
            ldc "https://groups.google.com/d/msg/guava-announce/zHZTFg7YF3o/rQNnwdHeEwAJ"
            aastore
         7: .line 120
            invokestatic com.google.common.base.Strings.lenientFormat:(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;
         8: .line 119
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
         9: .line 128
      StackMap locals: java.lang.String
      StackMap stack:
            getstatic com.google.common.collect.Platform.logger:Ljava/util/logging/Logger;
        10: .line 129
            getstatic java.util.logging.Level.WARNING:Ljava/util/logging/Level;
        11: .line 130
            ldc "Later in 2020, we will remove GWT-RPC support for Guava types. You are seeing this warning because you are sending a Guava type over GWT-RPC, which will break. You can identify which type by looking at the class name in the attached stack trace."
        12: .line 133
            new java.lang.Throwable
            dup
            invokespecial java.lang.Throwable.<init>:()V
        13: .line 128
            invokevirtual java.util.logging.Logger.log:(Ljava/util/logging/Level;Ljava/lang/String;Ljava/lang/Throwable;)V
        14: .line 135
            return
        end local 0 // java.lang.String propertyName
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            1   15     0  propertyName  Ljava/lang/String;

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.Platform this
         0: .line 137
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.collect.Platform this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/Platform;
}
SourceFile: "Platform.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible(emulated = true)