code: public static ClassLoader getSystemToolClassLoader() {
          try {
              Class<? extends JavaCompiler> c =
                      instance().getSystemToolClass(JavaCompiler.class, defaultJavaCompilerName);
              return c.getClassLoader();
          } catch (Throwable e) {
              return trace(WARNING, e);
          }
      }
docs: Returns the class loader for tools provided with this platform.
  This does not include user-installed tools.  Use the
  {@linkplain java.util.ServiceLoader service provider mechanism}
  for locating user installed tools.
  
  @return the class loader for tools provided with this platform
  or {@code null} if no tools are provided