flexible/java-17/websocket-jetty/src/main/java/com/example/flexible/websocket/jettynative/Main.java [78:111]:
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  private static void enableEmbeddedJspSupport(ServletContextHandler servletContextHandler)
      throws IOException {
    // Establish Scratch directory for the servlet context (used by JSP compilation)
    File tempDir = new File(System.getProperty("java.io.tmpdir"));
    File scratchDir = new File(tempDir.toString(), "embedded-jetty-jsp");

    if (!scratchDir.exists()) {
      if (!scratchDir.mkdirs()) {
        throw new IOException("Unable to create scratch directory: " + scratchDir);
      }
    }
    servletContextHandler.setAttribute("javax.servlet.context.tempdir", scratchDir);

    // Set Classloader of Context to be sane (needed for JSTL)
    // JSP requires a non-System classloader, this simply wraps the
    // embedded System classloader in a way that makes it suitable
    // for JSP to use
    ClassLoader jspClassLoader = new URLClassLoader(new URL[0], Main.class.getClassLoader());
    servletContextHandler.setClassLoader(jspClassLoader);

    // Manually call JettyJasperInitializer on context startup
    servletContextHandler.addBean(new JspStarter(servletContextHandler));

    // Create / Register JSP Servlet (must be named "jsp" per spec)
    ServletHolder holderJsp = new ServletHolder("jsp", JettyJspServlet.class);
    holderJsp.setInitOrder(0);
    holderJsp.setInitParameter("logVerbosityLevel", "DEBUG");
    holderJsp.setInitParameter("fork", "false");
    holderJsp.setInitParameter("xpoweredBy", "false");
    holderJsp.setInitParameter("compilerTargetVM", "1.8");
    holderJsp.setInitParameter("compilerSourceVM", "1.8");
    holderJsp.setInitParameter("keepgenerated", "true");
    servletContextHandler.addServlet(holderJsp, "*.jsp");
  }
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flexible/java-11/pubsub/src/main/java/com/example/flexible/pubsub/Main.java [76:109]:
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  private static void enableEmbeddedJspSupport(ServletContextHandler servletContextHandler)
      throws IOException {
    // Establish Scratch directory for the servlet context (used by JSP compilation)
    File tempDir = new File(System.getProperty("java.io.tmpdir"));
    File scratchDir = new File(tempDir.toString(), "embedded-jetty-jsp");

    if (!scratchDir.exists()) {
      if (!scratchDir.mkdirs()) {
        throw new IOException("Unable to create scratch directory: " + scratchDir);
      }
    }
    servletContextHandler.setAttribute("javax.servlet.context.tempdir", scratchDir);

    // Set Classloader of Context to be sane (needed for JSTL)
    // JSP requires a non-System classloader, this simply wraps the
    // embedded System classloader in a way that makes it suitable
    // for JSP to use
    ClassLoader jspClassLoader = new URLClassLoader(new URL[0], Main.class.getClassLoader());
    servletContextHandler.setClassLoader(jspClassLoader);

    // Manually call JettyJasperInitializer on context startup
    servletContextHandler.addBean(new JspStarter(servletContextHandler));

    // Create / Register JSP Servlet (must be named "jsp" per spec)
    ServletHolder holderJsp = new ServletHolder("jsp", JettyJspServlet.class);
    holderJsp.setInitOrder(0);
    holderJsp.setInitParameter("logVerbosityLevel", "DEBUG");
    holderJsp.setInitParameter("fork", "false");
    holderJsp.setInitParameter("xpoweredBy", "false");
    holderJsp.setInitParameter("compilerTargetVM", "1.8");
    holderJsp.setInitParameter("compilerSourceVM", "1.8");
    holderJsp.setInitParameter("keepgenerated", "true");
    servletContextHandler.addServlet(holderJsp, "*.jsp");
  }
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flexible/java-11/websocket-jetty/src/main/java/com/example/flexible/websocket/jettynative/Main.java [78:111]:
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  private static void enableEmbeddedJspSupport(ServletContextHandler servletContextHandler)
      throws IOException {
    // Establish Scratch directory for the servlet context (used by JSP compilation)
    File tempDir = new File(System.getProperty("java.io.tmpdir"));
    File scratchDir = new File(tempDir.toString(), "embedded-jetty-jsp");

    if (!scratchDir.exists()) {
      if (!scratchDir.mkdirs()) {
        throw new IOException("Unable to create scratch directory: " + scratchDir);
      }
    }
    servletContextHandler.setAttribute("javax.servlet.context.tempdir", scratchDir);

    // Set Classloader of Context to be sane (needed for JSTL)
    // JSP requires a non-System classloader, this simply wraps the
    // embedded System classloader in a way that makes it suitable
    // for JSP to use
    ClassLoader jspClassLoader = new URLClassLoader(new URL[0], Main.class.getClassLoader());
    servletContextHandler.setClassLoader(jspClassLoader);

    // Manually call JettyJasperInitializer on context startup
    servletContextHandler.addBean(new JspStarter(servletContextHandler));

    // Create / Register JSP Servlet (must be named "jsp" per spec)
    ServletHolder holderJsp = new ServletHolder("jsp", JettyJspServlet.class);
    holderJsp.setInitOrder(0);
    holderJsp.setInitParameter("logVerbosityLevel", "DEBUG");
    holderJsp.setInitParameter("fork", "false");
    holderJsp.setInitParameter("xpoweredBy", "false");
    holderJsp.setInitParameter("compilerTargetVM", "1.8");
    holderJsp.setInitParameter("compilerSourceVM", "1.8");
    holderJsp.setInitParameter("keepgenerated", "true");
    servletContextHandler.addServlet(holderJsp, "*.jsp");
  }
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