https://openjdk.java.net/ 
public interface sun.misc.ExtensionInstallationProvider
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.misc.ExtensionInstallationProvider
  super_class: java.lang.Object
{
  public abstract boolean installExtension(sun.misc.ExtensionInfo, sun.misc.ExtensionInfo);
    descriptor: (Lsun/misc/ExtensionInfo;Lsun/misc/ExtensionInfo;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws sun.misc.ExtensionInstallationException
    MethodParameters:
                  Name  Flags
      requestExtInfo    
      installedExtInfo  
}
SourceFile: "ExtensionInstallationProvider.java"