public static JavaCompiler getSystemJavaCompiler() 
{
        return instance().getSystemTool(JavaCompiler.class, defaultJavaCompilerName);
}

Gets the Java™ programming language compiler provided with this platform.

 public static ClassLoader getSystemToolClassLoader() 
{
        try {
            Class< ? extends JavaCompiler > c =
                    instance().getSystemToolClass(JavaCompiler.class, defaultJavaCompilerName);
            return c.getClassLoader();
        } catch (Throwable e) {
            return trace(WARNING, e);
        }
}

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.

 static T trace(Level level,
    Object reason) 
{
        // NOTE: do not make this method private as it affects stack traces
        try {
            if (System.getProperty(propertyName) != null) {
                StackTraceElement[] st = Thread.currentThread().getStackTrace();
                String method = "???";
                String cls = ToolProvider.class.getName();
                if (st.length  > 2) {
                    StackTraceElement frame = st[2];
                    method = String.format((Locale)null, "%s(%s:%s)",
                                           frame.getMethodName(),
                                           frame.getFileName(),
                                           frame.getLineNumber());
                    cls = frame.getClassName();
                }
                Logger logger = Logger.getLogger(loggerName);
                if (reason instanceof Throwable) {
                    logger.logp(level, cls, method,
                                reason.getClass().getName(), (Throwable)reason);
                } else {
                    logger.logp(level, cls, method, String.valueOf(reason));
                }
            }
        } catch (SecurityException ex) {
            System.err.format((Locale)null, "%s: %s; %s%n",
                              ToolProvider.class.getName(),
                              reason,
                              ex.getLocalizedMessage());
        }
        return null;
}