https://commons.apache.org/proper/commons-configuration/: Tools to assist in the reading of configuration/preferences files in various formats (The Apache Software Foundation)
  • Konstantin Shaposhnikov (scand.com)
  • Jamie M. Guillemette (TD Bank)
  • Jorge Ferrer ()
  • Gabriele Garuglieri (Infoblu S.p.A)
  • Nicolas De Loof (Cap Gemini)
  • Oliver Kopp
  • Dennis Kieselhorst (IRIAN Deutschland)
  • Raviteja Lokineni
  • Vincent Maurin (glispa GmbH)
  • The Alchemist
  • Pascal Essiembre (Norconex Inc.)
  • Patrick Schmidt
  • Daniel Rall (CollabNet, Inc.)
  • Jason van Zyl (Zenplex)
  • Martin Poeschl (tucana.at)
  • dIon Gillard (Multitask Consulting)
  • Henning P. Schmiedehausen (INTERMETA - Gesellschaft fuer Mehrwertdienste mbH)
  • Eric Pugh (upstate.com)
  • Brian E. Dunbar (dunbarconsulting.org)
  • Emmanuel Bourg (Ariane Software)
  • Oliver Heger (Bosch Software Innovations)
  • Jörg Schaible
  • Ralph Goers (Intuit)
  • Gary Gregory (Rocket Software)
  • Claude Warren
  • Rob Tompkins 
public class org.apache.commons.configuration2.interpol.EnvironmentLookup implements org.apache.commons.configuration2.interpol.Lookup
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.commons.configuration2.interpol.EnvironmentLookup
  super_class: java.lang.Object
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.commons.configuration2.interpol.EnvironmentLookup this
         0: .line 44
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.apache.commons.configuration2.interpol.EnvironmentLookup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/commons/configuration2/interpol/EnvironmentLookup;

  public java.lang.String lookup(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // org.apache.commons.configuration2.interpol.EnvironmentLookup this
        start local 1 // java.lang.String key
         0: .line 56
            aload 1 /* key */
            invokestatic java.lang.System.getenv:(Ljava/lang/String;)Ljava/lang/String;
            areturn
        end local 1 // java.lang.String key
        end local 0 // org.apache.commons.configuration2.interpol.EnvironmentLookup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/commons/configuration2/interpol/EnvironmentLookup;
            0    1     1   key  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      key   final

  public java.lang.Object lookup(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokevirtual org.apache.commons.configuration2.interpol.EnvironmentLookup.lookup:(Ljava/lang/String;)Ljava/lang/String;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "EnvironmentLookup.java"
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()