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.util.concurrent.ServiceManager$NoOpService extends com.google.common.util.concurrent.AbstractService
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.util.concurrent.ServiceManager$NoOpService
  super_class: com.google.common.util.concurrent.AbstractService
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.util.concurrent.ServiceManager$NoOpService this
         0: .line 838
            aload 0 /* this */
            invokespecial com.google.common.util.concurrent.AbstractService.<init>:()V
            return
        end local 0 // com.google.common.util.concurrent.ServiceManager$NoOpService this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/util/concurrent/ServiceManager$NoOpService;

  protected void doStart();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.util.concurrent.ServiceManager$NoOpService this
         0: .line 841
            aload 0 /* this */
            invokevirtual com.google.common.util.concurrent.ServiceManager$NoOpService.notifyStarted:()V
         1: .line 842
            return
        end local 0 // com.google.common.util.concurrent.ServiceManager$NoOpService this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/util/concurrent/ServiceManager$NoOpService;

  protected void doStop();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.util.concurrent.ServiceManager$NoOpService this
         0: .line 846
            aload 0 /* this */
            invokevirtual com.google.common.util.concurrent.ServiceManager$NoOpService.notifyStopped:()V
         1: .line 847
            return
        end local 0 // com.google.common.util.concurrent.ServiceManager$NoOpService this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/util/concurrent/ServiceManager$NoOpService;
}
SourceFile: "ServiceManager.java"
NestHost: com.google.common.util.concurrent.ServiceManager
InnerClasses:
  private final NoOpService = com.google.common.util.concurrent.ServiceManager$NoOpService of com.google.common.util.concurrent.ServiceManager