How to use

init

method

in

javax.servlet.Servlet

/**
 * Initialize the wrapped Servlet instance.
 * @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
 */
@Override
public void afterPropertiesSet() throws Exception {
  if (this.servletClass == null) {
    throw new IllegalArgumentException("'servletClass' is required");
  }
  if (this.servletName == null) {
    this.servletName = this.beanName;
  }
  this.servletInstance = ReflectionUtils.accessibleConstructor(this.servletClass).newInstance();
  this.servletInstance.init(new DelegatingServletConfig());
}

@Override
public void init(ServletConfig config) throws ServletException {
  wrappedServlet.init(new ServletConfigWrapper(config));
}

@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
  if (bean instanceof Servlet) {
    ServletConfig config = this.servletConfig;
    if (config == null || !this.useSharedServletConfig) {
      config = new DelegatingServletConfig(beanName, this.servletContext);
    }
    try {
      ((Servlet) bean).init(config);
    }
    catch (ServletException ex) {
      throw new BeanInitializationException("Servlet.init threw exception", ex);
    }
  }
  return bean;
}

/**
 * Initialize the wrapped Servlet instance.
 * @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
 */
@Override
public void afterPropertiesSet() throws Exception {
  if (this.servletClass == null) {
    throw new IllegalArgumentException("'servletClass' is required");
  }
  if (this.servletName == null) {
    this.servletName = this.beanName;
  }
  this.servletInstance = ReflectionUtils.accessibleConstructor(this.servletClass).newInstance();
  this.servletInstance.init(new DelegatingServletConfig());
}

/**
 * Initialize the {@link Filter}
 *
 * @throws javax.servlet.ServletException
 */
public void init() throws ServletException {
  for (FilterConfigImpl f : filters) {
    if (f != null) {
      f.getFilter().init(f);
    }
  }
  if (servlet != null) {
    servlet.init(configImpl);
  }
}

@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
  if (bean instanceof Servlet) {
    ServletConfig config = this.servletConfig;
    if (config == null || !this.useSharedServletConfig) {
      config = new DelegatingServletConfig(beanName, this.servletContext);
    }
    try {
      ((Servlet) bean).init(config);
    }
    catch (ServletException ex) {
      throw new BeanInitializationException("Servlet.init threw exception", ex);
    }
  }
  return bean;
}

@Override
protected void doPortalInit() throws Exception {
  ServletContext servletContext = servletConfig.getServletContext();
  ClassLoader classLoader = (ClassLoader)servletContext.getAttribute(
    PluginContextListener.PLUGIN_CLASS_LOADER);
  String servletClass = servletConfig.getInitParameter("servlet-class");
  servlet = (Servlet)InstanceFactory.newInstance(
    classLoader, servletClass);
  servlet.init(servletConfig);
}

public void setServletConfig(ServletConfig servletConfig) {
  try {
    shadowCxfServlet = (Servlet)servletClass.newInstance();
  } catch (InstantiationException | IllegalAccessException e) {
    throw new RuntimeException(e);
  }
  try {
    shadowCxfServlet.init(servletConfig);
  } catch (ServletException ex) {
    throw new RuntimeException(ex.getMessage(), ex);
  }
}

servlet.init(new MockServletConfig(servletContext, "myHandler"));

@Override
protected void doPortalInit() throws Exception {
  ServletContext servletContext = servletConfig.getServletContext();
  ClassLoader classLoader = (ClassLoader)servletContext.getAttribute(
    PluginContextListener.PLUGIN_CLASS_LOADER);
  String servletClass = servletConfig.getInitParameter("servlet-class");
  _subcontext = servletConfig.getInitParameter("sub-context");
  if (_subcontext == null) {
    _subcontext = getServletName();
  }
  servlet = (Servlet)InstanceFactory.newInstance(
    classLoader, servletClass);
  if (!(servlet instanceof HttpServlet)) {
    throw new IllegalArgumentException(
      "servlet-class is not an instance of " +
        HttpServlet.class.getName());
  }
  servlet.init(servletConfig);
  PortalDelegatorServlet.addDelegate(_subcontext, (HttpServlet)servlet);
}

private static Servlet getServlet(
  String cbClassName,
  String dataSourceText,
  Map<List<String>, Servlet> cache)
  throws ServletException
{
  final List<String> key =
    Collections.singletonList(
      dataSourceText);
  Servlet servlet = cache.get(key);
  if (servlet != null) {
    return servlet;
  }
  MockServletContext servletContext = new MockServletContext();
  MockServletConfig servletConfig = new MockServletConfig(servletContext);
  servletConfig.addInitParameter(
    XmlaServlet.PARAM_CALLBACKS, cbClassName);
  servletConfig.addInitParameter(
    XmlaServlet.PARAM_CHAR_ENCODING, "UTF-8");
  servletConfig.addInitParameter(
    XmlaServlet.PARAM_DATASOURCES_CONFIG,
    "inline:" + dataSourceText);
  servlet = new MondrianXmlaServlet();
  servlet.init(servletConfig);
  if (cache != null) {
    cache.put(key, servlet);
  }
  return servlet;
}

@Override
public void init(ServletConfig config) throws ServletException
{
  displayChart.init(config);
}

public void setServletConfig(ServletConfig servletConfig) {
  try {
    shadowCxfServlet = (Servlet)servletClass.newInstance();
  } catch (InstantiationException | IllegalAccessException e) {
    throw new RuntimeException(e);
  }
  try {
    shadowCxfServlet.init(servletConfig);
  } catch (ServletException ex) {
    throw new RuntimeException(ex.getMessage(), ex);
  }
}

@Override
public void init(final ServletConfig config) throws ServletException
{
  super.init(config);
  dispatcherServlet.init(config);
  getHttpServiceController().register(config.getServletContext(), serviceRegProps);
}

public void update(Servlet servlet, Collection<BasicRequestHandler> basicRequestHandlers){
  try {
    servlet.init(this.servlet.getServletConfig());
  } catch (ServletException e) {
    throw new RuntimeException(e);
  }
  this.servlet=servlet;
  this.basicRequestHandler = basicRequestHandlers==null? Collections.emptyList():new ArrayList<>(basicRequestHandlers);
}

synchronized Servlet getServlet() throws ClassNotFoundException, InstantiationException, IllegalAccessException, ServletException {
  if (_servlet == null) {
    Class servletClass = Class.forName( getClassName() );
    _servlet = (Servlet) servletClass.newInstance();
    String servletName = _servletName != null ? _servletName : _servlet.getClass().getName();
    _servlet.init( new ServletUnitServletConfig( servletName, WebApplication.this, getInitParams() ) );
  }
  return _servlet;
}

synchronized Servlet getServlet() throws ClassNotFoundException, InstantiationException, IllegalAccessException, ServletException {
  if (_servlet == null) {
    Class servletClass = Class.forName( getClassName() );
    _servlet = (Servlet) servletClass.newInstance();
    String servletName = _servletName != null ? _servletName : _servlet.getClass().getName();
    _servlet.init( new ServletUnitServletConfig( servletName, WebApplication.this, getInitParams() ) );
  }
  return _servlet;
}

/**
 * Starts {@link Servlet} instance of this {@link OSGiServletHandler}.
 *
 * @throws ServletException If {@link Servlet} startup failed.
 */
public void startServlet() throws ServletException {
  configureServletEnv();
  servletInstance.init(getServletConfig());
}

 String jspClassName = findJspClassForJSP("your.jsp");
Class jspClass = Class.forName(jspClassName);
Servlet jspServlet = (Servlet)jspClass.newInstance();
MyServletRequest req = new MyServletRequest();
MyServletResponse resp = new MyServletResponse();
jspServlet.init();
jspServlet.service(req, resp);
jspServlet.destroy();
String results = reps.getContent();

@Override
public void init()
  throws ServletException
{
  String name = "servlet_" + getId();
  ServletConfig config = new ServletConfigImpl(name, getContext(), getInitParams());
  this.servlet.init(config);
}