Class LookupServletContainerInitializer

Constructor Detail

• LookupServletContainerInitializer

  public LookupServletContainerInitializer()

Method Detail

• process

  public void process​(Set<Class<?>> classSet,
                      javax.servlet.ServletContext servletContext)
               throws javax.servlet.ServletException

  Description copied from interface: ClassLoaderAwareServletContainerInitializer

  Implement this method instead of ClassLoaderAwareServletContainerInitializer.onStartup(Set, ServletContext) to handle classes accessible by different classloaders.

  Specified by:

  process in interface ClassLoaderAwareServletContainerInitializer

  Parameters:

  classSet - the Set of application classes that extend, implement, or have been annotated with the class types specified by the HandlesTypes annotation, or null if there are no matches, or this ServletContainerInitializer has not been annotated with HandlesTypes

  servletContext - the ServletContext of the web application that is being started and in which the classes contained in classSet were found

  Throws:

  javax.servlet.ServletException - if an error has occurred

  See Also:

  ClassLoaderAwareServletContainerInitializer.onStartup(Set, ServletContext)

• requiresLookup

  public boolean requiresLookup()

  Description copied from interface: ClassLoaderAwareServletContainerInitializer

  Whether this initializer requires lookup or not.

  Specified by:

  requiresLookup in interface ClassLoaderAwareServletContainerInitializer

  Returns:

  whether this initializer requires lookup

• getServiceTypes

  protected Collection<Class<?>> getServiceTypes()

  Gets the service types that are used to set services into the Lookup based on found subtypes by the ServletContainerInitializer.

  LookupServletContainerInitializer uses ServletContainerInitializer classes discovering mechanism based on HandlesTypes annotation. The method may be overridden to return the service types which should be put into the Lookup instance if another mechanism of class searching is used (e.g. Spring boot case).

  The set of classes (passed into the process(Set, ServletContext) method) will be filtered via checking whether they are assignable to the service types and the resulting classes will be instantiated via reflection.

  Returns:

  a collection of service types which should be available via Lookup

  See Also:

  LookupInitializer.initialize(VaadinContext, Map, VaadinApplicationInitializationBootstrap)