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. 
public class com.google.common.base.internal.Finalizer implements java.lang.Runnable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.google.common.base.internal.Finalizer
  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

  private static final java.lang.String FINALIZABLE_REFERENCE;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "com.google.common.base.FinalizableReference"

  private final java.lang.ref.WeakReference<java.lang.Class<?>> finalizableReferenceClassReference;
    descriptor: Ljava/lang/ref/WeakReference;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/lang/ref/WeakReference<Ljava/lang/Class<*>;>;

  private final java.lang.ref.PhantomReference<java.lang.Object> frqReference;
    descriptor: Ljava/lang/ref/PhantomReference;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/lang/ref/PhantomReference<Ljava/lang/Object;>;

  private final java.lang.ref.ReferenceQueue<java.lang.Object> queue;
    descriptor: Ljava/lang/ref/ReferenceQueue;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/lang/ref/ReferenceQueue<Ljava/lang/Object;>;

  private static final java.lang.reflect.Constructor<java.lang.Thread> bigThreadConstructor;
    descriptor: Ljava/lang/reflect/Constructor;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    Signature: Ljava/lang/reflect/Constructor<Ljava/lang/Thread;>;
    RuntimeVisibleTypeAnnotations: 
      FIELD
        org.checkerframework.checker.nullness.qual.Nullable()

  private static final java.lang.reflect.Field inheritableThreadLocals;
    descriptor: Ljava/lang/reflect/Field;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    RuntimeVisibleTypeAnnotations: 
      FIELD
        org.checkerframework.checker.nullness.qual.Nullable()

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 48
            ldc Lcom/google/common/base/internal/Finalizer;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokestatic java.util.logging.Logger.getLogger:(Ljava/lang/String;)Ljava/util/logging/Logger;
            putstatic com.google.common.base.internal.Finalizer.logger:Ljava/util/logging/Logger;
         1: .line 120
            invokestatic com.google.common.base.internal.Finalizer.getBigThreadConstructor:()Ljava/lang/reflect/Constructor;
         2: .line 119
            putstatic com.google.common.base.internal.Finalizer.bigThreadConstructor:Ljava/lang/reflect/Constructor;
         3: .line 123
            getstatic com.google.common.base.internal.Finalizer.bigThreadConstructor:Ljava/lang/reflect/Constructor;
            ifnonnull 4
            invokestatic com.google.common.base.internal.Finalizer.getInheritableThreadLocalsField:()Ljava/lang/reflect/Field;
            goto 5
      StackMap locals:
      StackMap stack:
         4: aconst_null
         5: .line 122
      StackMap locals:
      StackMap stack: java.lang.reflect.Field
            putstatic com.google.common.base.internal.Finalizer.inheritableThreadLocals:Ljava/lang/reflect/Field;
         6: .line 123
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static void startFinalizer(java.lang.Class<?>, java.lang.ref.ReferenceQueue<java.lang.Object>, java.lang.ref.PhantomReference<java.lang.Object>);
    descriptor: (Ljava/lang/Class;Ljava/lang/ref/ReferenceQueue;Ljava/lang/ref/PhantomReference;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=6, locals=9, args_size=3
        start local 0 // java.lang.Class finalizableReferenceClass
        start local 1 // java.lang.ref.ReferenceQueue queue
        start local 2 // java.lang.ref.PhantomReference frqReference
         0: .line 74
            aload 0 /* finalizableReferenceClass */
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            ldc "com.google.common.base.FinalizableReference"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 2
         1: .line 75
            new java.lang.IllegalArgumentException
            dup
            ldc "Expected com.google.common.base.FinalizableReference."
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 78
      StackMap locals:
      StackMap stack:
            new com.google.common.base.internal.Finalizer
            dup
            aload 0 /* finalizableReferenceClass */
            aload 1 /* queue */
            aload 2 /* frqReference */
            invokespecial com.google.common.base.internal.Finalizer.<init>:(Ljava/lang/Class;Ljava/lang/ref/ReferenceQueue;Ljava/lang/ref/PhantomReference;)V
            astore 3 /* finalizer */
        start local 3 // com.google.common.base.internal.Finalizer finalizer
         3: .line 79
            ldc Lcom/google/common/base/internal/Finalizer;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            astore 4 /* threadName */
        start local 4 // java.lang.String threadName
         4: .line 80
            aconst_null
            astore 5 /* thread */
        start local 5 // java.lang.Thread thread
         5: .line 81
            getstatic com.google.common.base.internal.Finalizer.bigThreadConstructor:Ljava/lang/reflect/Constructor;
            ifnull 17
         6: .line 83
            iconst_0
            istore 6 /* inheritThreadLocals */
        start local 6 // boolean inheritThreadLocals
         7: .line 84
            lconst_0
            lstore 7 /* defaultStackSize */
        start local 7 // long defaultStackSize
         8: .line 86
            getstatic com.google.common.base.internal.Finalizer.bigThreadConstructor:Ljava/lang/reflect/Constructor;
            iconst_5
            anewarray java.lang.Object
            dup
            iconst_0
         9: .line 87
            aconst_null
            aastore
            dup
            iconst_1
            aload 3 /* finalizer */
            aastore
            dup
            iconst_2
            aload 4 /* threadName */
            aastore
            dup
            iconst_3
            lload 7 /* defaultStackSize */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            aastore
            dup
            iconst_4
            iload 6 /* inheritThreadLocals */
            invokestatic java.lang.Boolean.valueOf:(Z)Ljava/lang/Boolean;
            aastore
        10: .line 86
            invokevirtual java.lang.reflect.Constructor.newInstance:([Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.lang.Thread
        11: .line 85
            astore 5 /* thread */
        end local 7 // long defaultStackSize
        end local 6 // boolean inheritThreadLocals
        12: .line 88
            goto 17
      StackMap locals: java.lang.Class java.lang.ref.ReferenceQueue java.lang.ref.PhantomReference com.google.common.base.internal.Finalizer java.lang.String java.lang.Thread
      StackMap stack: java.lang.Throwable
        13: astore 6 /* t */
        start local 6 // java.lang.Throwable t
        14: .line 89
            getstatic com.google.common.base.internal.Finalizer.logger:Ljava/util/logging/Logger;
        15: .line 90
            getstatic java.util.logging.Level.INFO:Ljava/util/logging/Level;
            ldc "Failed to create a thread without inherited thread-local values"
            aload 6 /* t */
        16: .line 89
            invokevirtual java.util.logging.Logger.log:(Ljava/util/logging/Level;Ljava/lang/String;Ljava/lang/Throwable;)V
        end local 6 // java.lang.Throwable t
        17: .line 93
      StackMap locals:
      StackMap stack:
            aload 5 /* thread */
            ifnonnull 19
        18: .line 94
            new java.lang.Thread
            dup
            aconst_null
            aload 3 /* finalizer */
            aload 4 /* threadName */
            invokespecial java.lang.Thread.<init>:(Ljava/lang/ThreadGroup;Ljava/lang/Runnable;Ljava/lang/String;)V
            astore 5 /* thread */
        19: .line 96
      StackMap locals:
      StackMap stack:
            aload 5 /* thread */
            iconst_1
            invokevirtual java.lang.Thread.setDaemon:(Z)V
        20: .line 99
            getstatic com.google.common.base.internal.Finalizer.inheritableThreadLocals:Ljava/lang/reflect/Field;
            ifnull 29
        21: .line 100
            getstatic com.google.common.base.internal.Finalizer.inheritableThreadLocals:Ljava/lang/reflect/Field;
            aload 5 /* thread */
            aconst_null
            invokevirtual java.lang.reflect.Field.set:(Ljava/lang/Object;Ljava/lang/Object;)V
        22: .line 102
            goto 29
      StackMap locals:
      StackMap stack: java.lang.Throwable
        23: astore 6 /* t */
        start local 6 // java.lang.Throwable t
        24: .line 103
            getstatic com.google.common.base.internal.Finalizer.logger:Ljava/util/logging/Logger;
        25: .line 104
            getstatic java.util.logging.Level.INFO:Ljava/util/logging/Level;
        26: .line 105
            ldc "Failed to clear thread local values inherited by reference finalizer thread."
        27: .line 106
            aload 6 /* t */
        28: .line 103
            invokevirtual java.util.logging.Logger.log:(Ljava/util/logging/Level;Ljava/lang/String;Ljava/lang/Throwable;)V
        end local 6 // java.lang.Throwable t
        29: .line 109
      StackMap locals:
      StackMap stack:
            aload 5 /* thread */
            invokevirtual java.lang.Thread.start:()V
        30: .line 110
            return
        end local 5 // java.lang.Thread thread
        end local 4 // java.lang.String threadName
        end local 3 // com.google.common.base.internal.Finalizer finalizer
        end local 2 // java.lang.ref.PhantomReference frqReference
        end local 1 // java.lang.ref.ReferenceQueue queue
        end local 0 // java.lang.Class finalizableReferenceClass
      LocalVariableTable:
        Start  End  Slot                       Name  Signature
            0   31     0  finalizableReferenceClass  Ljava/lang/Class<*>;
            0   31     1                      queue  Ljava/lang/ref/ReferenceQueue<Ljava/lang/Object;>;
            0   31     2               frqReference  Ljava/lang/ref/PhantomReference<Ljava/lang/Object;>;
            3   31     3                  finalizer  Lcom/google/common/base/internal/Finalizer;
            4   31     4                 threadName  Ljava/lang/String;
            5   31     5                     thread  Ljava/lang/Thread;
            7   12     6        inheritThreadLocals  Z
            8   12     7           defaultStackSize  J
           14   17     6                          t  Ljava/lang/Throwable;
           24   29     6                          t  Ljava/lang/Throwable;
      Exception table:
        from    to  target  type
           6    12      13  Class java.lang.Throwable
          20    22      23  Class java.lang.Throwable
    Signature: (Ljava/lang/Class<*>;Ljava/lang/ref/ReferenceQueue<Ljava/lang/Object;>;Ljava/lang/ref/PhantomReference<Ljava/lang/Object;>;)V
    MethodParameters:
                           Name  Flags
      finalizableReferenceClass  
      queue                      
      frqReference               

  private void <init>(java.lang.Class<?>, java.lang.ref.ReferenceQueue<java.lang.Object>, java.lang.ref.PhantomReference<java.lang.Object>);
    descriptor: (Ljava/lang/Class;Ljava/lang/ref/ReferenceQueue;Ljava/lang/ref/PhantomReference;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // com.google.common.base.internal.Finalizer this
        start local 1 // java.lang.Class finalizableReferenceClass
        start local 2 // java.lang.ref.ReferenceQueue queue
        start local 3 // java.lang.ref.PhantomReference frqReference
         0: .line 126
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 130
            aload 0 /* this */
            aload 2 /* queue */
            putfield com.google.common.base.internal.Finalizer.queue:Ljava/lang/ref/ReferenceQueue;
         2: .line 132
            aload 0 /* this */
         3: .line 133
            new java.lang.ref.WeakReference
            dup
            aload 1 /* finalizableReferenceClass */
            invokespecial java.lang.ref.WeakReference.<init>:(Ljava/lang/Object;)V
         4: .line 132
            putfield com.google.common.base.internal.Finalizer.finalizableReferenceClassReference:Ljava/lang/ref/WeakReference;
         5: .line 136
            aload 0 /* this */
            aload 3 /* frqReference */
            putfield com.google.common.base.internal.Finalizer.frqReference:Ljava/lang/ref/PhantomReference;
         6: .line 137
            return
        end local 3 // java.lang.ref.PhantomReference frqReference
        end local 2 // java.lang.ref.ReferenceQueue queue
        end local 1 // java.lang.Class finalizableReferenceClass
        end local 0 // com.google.common.base.internal.Finalizer this
      LocalVariableTable:
        Start  End  Slot                       Name  Signature
            0    7     0                       this  Lcom/google/common/base/internal/Finalizer;
            0    7     1  finalizableReferenceClass  Ljava/lang/Class<*>;
            0    7     2                      queue  Ljava/lang/ref/ReferenceQueue<Ljava/lang/Object;>;
            0    7     3               frqReference  Ljava/lang/ref/PhantomReference<Ljava/lang/Object;>;
    Signature: (Ljava/lang/Class<*>;Ljava/lang/ref/ReferenceQueue<Ljava/lang/Object;>;Ljava/lang/ref/PhantomReference<Ljava/lang/Object;>;)V
    MethodParameters:
                           Name  Flags
      finalizableReferenceClass  
      queue                      
      frqReference               

  public void run();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.base.internal.Finalizer this
         0: .line 145
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 0 /* this */
            getfield com.google.common.base.internal.Finalizer.queue:Ljava/lang/ref/ReferenceQueue;
            invokevirtual java.lang.ref.ReferenceQueue.remove:()Ljava/lang/ref/Reference;
            invokevirtual com.google.common.base.internal.Finalizer.cleanUp:(Ljava/lang/ref/Reference;)Z
            ifne 0
         1: .line 146
            goto 4
         2: .line 148
      StackMap locals:
      StackMap stack: java.lang.InterruptedException
            pop
         3: .line 143
            goto 0
         4: .line 152
      StackMap locals:
      StackMap stack:
            return
        end local 0 // com.google.common.base.internal.Finalizer this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lcom/google/common/base/internal/Finalizer;
      Exception table:
        from    to  target  type
           0     1       2  Class java.lang.InterruptedException

  private boolean cleanUp(java.lang.ref.Reference<?>);
    descriptor: (Ljava/lang/ref/Reference;)Z
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=4, args_size=2
        start local 0 // com.google.common.base.internal.Finalizer this
        start local 1 // java.lang.ref.Reference reference
         0: .line 161
            aload 0 /* this */
            invokevirtual com.google.common.base.internal.Finalizer.getFinalizeReferentMethod:()Ljava/lang/reflect/Method;
            astore 2 /* finalizeReferentMethod */
        start local 2 // java.lang.reflect.Method finalizeReferentMethod
         1: .line 162
            aload 2 /* finalizeReferentMethod */
            ifnonnull 3
         2: .line 163
            iconst_0
            ireturn
         3: .line 170
      StackMap locals: java.lang.reflect.Method
      StackMap stack:
            aload 1 /* reference */
            invokevirtual java.lang.ref.Reference.clear:()V
         4: .line 172
            aload 1 /* reference */
            aload 0 /* this */
            getfield com.google.common.base.internal.Finalizer.frqReference:Ljava/lang/ref/PhantomReference;
            if_acmpne 6
         5: .line 176
            iconst_0
            ireturn
         6: .line 180
      StackMap locals:
      StackMap stack:
            aload 2 /* finalizeReferentMethod */
            aload 1 /* reference */
            iconst_0
            anewarray java.lang.Object
            invokevirtual java.lang.reflect.Method.invoke:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
            pop
         7: .line 181
            goto 10
      StackMap locals:
      StackMap stack: java.lang.Throwable
         8: astore 3 /* t */
        start local 3 // java.lang.Throwable t
         9: .line 182
            getstatic com.google.common.base.internal.Finalizer.logger:Ljava/util/logging/Logger;
            getstatic java.util.logging.Level.SEVERE:Ljava/util/logging/Level;
            ldc "Error cleaning up after reference."
            aload 3 /* t */
            invokevirtual java.util.logging.Logger.log:(Ljava/util/logging/Level;Ljava/lang/String;Ljava/lang/Throwable;)V
        end local 3 // java.lang.Throwable t
        10: .line 189
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.google.common.base.internal.Finalizer.queue:Ljava/lang/ref/ReferenceQueue;
            invokevirtual java.lang.ref.ReferenceQueue.poll:()Ljava/lang/ref/Reference;
            dup
            astore 1 /* reference */
            ifnonnull 3
        11: .line 190
            iconst_1
            ireturn
        end local 2 // java.lang.reflect.Method finalizeReferentMethod
        end local 1 // java.lang.ref.Reference reference
        end local 0 // com.google.common.base.internal.Finalizer this
      LocalVariableTable:
        Start  End  Slot                    Name  Signature
            0   12     0                    this  Lcom/google/common/base/internal/Finalizer;
            0   12     1               reference  Ljava/lang/ref/Reference<*>;
            1   12     2  finalizeReferentMethod  Ljava/lang/reflect/Method;
            9   10     3                       t  Ljava/lang/Throwable;
      Exception table:
        from    to  target  type
           6     7       8  Class java.lang.Throwable
    Signature: (Ljava/lang/ref/Reference<*>;)Z
    MethodParameters:
           Name  Flags
      reference  

  private java.lang.reflect.Method getFinalizeReferentMethod();
    descriptor: ()Ljava/lang/reflect/Method;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // com.google.common.base.internal.Finalizer this
         0: .line 195
            aload 0 /* this */
            getfield com.google.common.base.internal.Finalizer.finalizableReferenceClassReference:Ljava/lang/ref/WeakReference;
            invokevirtual java.lang.ref.WeakReference.get:()Ljava/lang/Object;
            checkcast java.lang.Class
            astore 1 /* finalizableReferenceClass */
        start local 1 // java.lang.Class finalizableReferenceClass
         1: .line 196
            aload 1 /* finalizableReferenceClass */
            ifnonnull 3
         2: .line 203
            aconst_null
            areturn
         3: .line 206
      StackMap locals: java.lang.Class
      StackMap stack:
            aload 1 /* finalizableReferenceClass */
            ldc "finalizeReferent"
            iconst_0
            anewarray java.lang.Class
            invokevirtual java.lang.Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;
         4: areturn
         5: .line 207
      StackMap locals:
      StackMap stack: java.lang.NoSuchMethodException
            astore 2 /* e */
        start local 2 // java.lang.NoSuchMethodException e
         6: .line 208
            new java.lang.AssertionError
            dup
            aload 2 /* e */
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
        end local 2 // java.lang.NoSuchMethodException e
        end local 1 // java.lang.Class finalizableReferenceClass
        end local 0 // com.google.common.base.internal.Finalizer this
      LocalVariableTable:
        Start  End  Slot                       Name  Signature
            0    7     0                       this  Lcom/google/common/base/internal/Finalizer;
            1    7     1  finalizableReferenceClass  Ljava/lang/Class<*>;
            6    7     2                          e  Ljava/lang/NoSuchMethodException;
      Exception table:
        from    to  target  type
           3     4       5  Class java.lang.NoSuchMethodException
    RuntimeVisibleTypeAnnotations: 
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()

  private static java.lang.reflect.Field getInheritableThreadLocalsField();
    descriptor: ()Ljava/lang/reflect/Field;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=0
         0: .line 214
            ldc Ljava/lang/Thread;
            ldc "inheritableThreadLocals"
            invokevirtual java.lang.Class.getDeclaredField:(Ljava/lang/String;)Ljava/lang/reflect/Field;
            astore 0 /* inheritableThreadLocals */
        start local 0 // java.lang.reflect.Field inheritableThreadLocals
         1: .line 215
            aload 0 /* inheritableThreadLocals */
            iconst_1
            invokevirtual java.lang.reflect.Field.setAccessible:(Z)V
         2: .line 216
            aload 0 /* inheritableThreadLocals */
         3: areturn
        end local 0 // java.lang.reflect.Field inheritableThreadLocals
         4: .line 217
      StackMap locals:
      StackMap stack: java.lang.Throwable
            pop
         5: .line 218
            getstatic com.google.common.base.internal.Finalizer.logger:Ljava/util/logging/Logger;
         6: .line 219
            getstatic java.util.logging.Level.INFO:Ljava/util/logging/Level;
         7: .line 220
            ldc "Couldn't access Thread.inheritableThreadLocals. Reference finalizer threads will inherit thread local values."
         8: .line 218
            invokevirtual java.util.logging.Logger.log:(Ljava/util/logging/Level;Ljava/lang/String;)V
         9: .line 222
            aconst_null
            areturn
      LocalVariableTable:
        Start  End  Slot                     Name  Signature
            1    4     0  inheritableThreadLocals  Ljava/lang/reflect/Field;
      Exception table:
        from    to  target  type
           0     3       4  Class java.lang.Throwable
    RuntimeVisibleTypeAnnotations: 
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()

  private static java.lang.reflect.Constructor<java.lang.Thread> getBigThreadConstructor();
    descriptor: ()Ljava/lang/reflect/Constructor;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=5, locals=0, args_size=0
         0: .line 228
            ldc Ljava/lang/Thread;
            iconst_5
            anewarray java.lang.Class
            dup
            iconst_0
         1: .line 229
            ldc Ljava/lang/ThreadGroup;
            aastore
            dup
            iconst_1
            ldc Ljava/lang/Runnable;
            aastore
            dup
            iconst_2
            ldc Ljava/lang/String;
            aastore
            dup
            iconst_3
            getstatic java.lang.Long.TYPE:Ljava/lang/Class;
            aastore
            dup
            iconst_4
            getstatic java.lang.Boolean.TYPE:Ljava/lang/Class;
            aastore
         2: .line 228
            invokevirtual java.lang.Class.getConstructor:([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;
         3: areturn
         4: .line 230
      StackMap locals:
      StackMap stack: java.lang.Throwable
            pop
         5: .line 232
            aconst_null
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
      Exception table:
        from    to  target  type
           0     3       4  Class java.lang.Throwable
    Signature: ()Ljava/lang/reflect/Constructor<Ljava/lang/Thread;>;
    RuntimeVisibleTypeAnnotations: 
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()
}
SourceFile: "Finalizer.java"