Tomcat (Apache Tomcat 8.5.57 API Documentation)

org.apache.catalina.startup

## Class Tomcat

- java.lang.Object
- - org.apache.catalina.startup.Tomcat

-     public class Tomcat
      extends Object

  Minimal tomcat starter for embedding/unit tests.

  Tomcat supports multiple styles of configuration and startup - the most common and stable is server.xml-based, implemented in org.apache.catalina.startup.Bootstrap.

  This class is for use in apps that embed tomcat.

  Requirements:

  - all tomcat classes and possibly servlets are in the classpath. (for example all is in one big jar, or in eclipse CP, or in any other combination)
  - we need one temporary directory for work files
  - no config file is required. This class provides methods to use if you have a webapp with a web.xml file, but it is optional - you can use your own servlets.

  There are a variety of 'add' methods to configure servlets and webapps. These methods, by default, create a simple in-memory security realm and apply it. If you need more complex security processing, you can define a subclass of this class.

  This class provides a set of convenience methods for configuring web application contexts; all overloads of the method `addWebapp()`. These methods are equivalent to adding a web application to the Host's appBase (normally the webapps directory). These methods create a Context, configure it with the equivalent of the defaults provided by `conf/web.xml` (see `initWebappDefaults(String)` for details) and add the Context to a Host. These methods do not use a global default web.xml; rather, they add a `LifecycleListener` to configure the defaults. Any WEB-INF/web.xml and META-INF/context.xml packaged with the application will be processed normally. Normal web fragment and `ServletContainerInitializer` processing will be applied.

  In complex cases, you may prefer to use the ordinary Tomcat API to create webapp contexts; for example, you might need to install a custom Loader before the call to `Container.addChild(Container)`. To replicate the basic behavior of the `addWebapp` methods, you may want to call two methods of this class: `noDefaultWebXmlPath()` and `getDefaultWebXmlListener()`.

  `getDefaultWebXmlListener()` returns a `LifecycleListener` that adds the standard DefaultServlet, JSP processing, and welcome files. If you add this listener, you must prevent Tomcat from applying any standard global web.xml with ...

  `noDefaultWebXmlPath()` returns a dummy pathname to configure to prevent `ContextConfig` from trying to apply a global web.xml file.

  This class provides a main() and few simple CLI arguments, see setters for doc. It can be used for simple tests and demo.

  Author:
    Costin Manolache
  See Also:
    TestTomcat

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `Tomcat.DefaultWebXmlListener` Fix reload - required if reloading and using programmatic configuration.
    `static class` | `Tomcat.ExistingStandardWrapper` Helper class for wrapping existing servlets.
    `static class` | `Tomcat.FixContextListener` Fix startup sequence - required if you don't use web.xml.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected String` | `basedir`
    `protected boolean` | `defaultConnectorCreated`
    `protected String` | `hostname`
    `protected int` | `port`
    `protected Server` | `server`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Tomcat()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Context` | `addContext(Host host, String contextPath, String dir)`
    `Context` | `addContext(Host host, String contextPath, String contextName, String dir)`
    `Context` | `addContext(String contextPath, String docBase)` Add a context - programmatic mode, no default web.xml used.
    `static void` | `addDefaultMimeTypeMappings(Context context)` Add the default MIME type mappings to the provide Context.
    `void` | `addRole(String user, String role)` Add a role to a user.
    `static Wrapper` | `addServlet(Context ctx, String servletName, Servlet servlet)` Static version of `addServlet(String, String, Servlet)`.
    `static Wrapper` | `addServlet(Context ctx, String servletName, String servletClass)` Static version of `addServlet(String, String, String)`
    `Wrapper` | `addServlet(String contextPath, String servletName, Servlet servlet)` Add an existing Servlet to the context with no class.forName or initialisation.
    `Wrapper` | `addServlet(String contextPath, String servletName, String servletClass)` Equivalent to <servlet><servlet-name><servlet-class>.
    `void` | `addUser(String user, String pass)` Add a user for the in-memory realm.
    `Context` | `addWebapp(Host host, String contextPath, String docBase)` This is equivalent to adding a web application to a Host's appBase (usually Tomcat's webapps directory).
    `Context` | `addWebapp(Host host, String contextPath, String docBase, ContextConfig config)` Deprecated. Use `addWebapp(Host, String, String, LifecycleListener)` instead
    `Context` | `addWebapp(Host host, String contextPath, String docBase, LifecycleListener config)` This is equivalent to adding a web application to a Host's appBase (usually Tomcat's webapps directory).
    `Context` | `addWebapp(String contextPath, String docBase)` This is equivalent to adding a web application to a Host's appBase (usually Tomcat's webapps directory).
    `Context` | `addWebapp(String contextPath, URL source)` Copy the specified WAR file to the Host's appBase and then call `addWebapp(String, String)` with the newly copied WAR.
    `protected Realm` | `createDefaultRealm()` Create an in-memory realm.
    `void` | `destroy()` Destroy the server.
    `void` | `enableNaming()` Enables JNDI naming which is disabled by default.
    `Connector` | `getConnector()` Get the default http connector.
    `LifecycleListener` | `getDefaultWebXmlListener()` Return a listener that provides the required configuration items for JSP processing.
    `Engine` | `getEngine()` Access to the engine, for further customization.
    `Host` | `getHost()`
    `Server` | `getServer()` Get the server object.
    `Service` | `getService()` Get the service object.
    `protected URL` | `getWebappConfigFile(String path, String contextName)`
    `void` | `init()` Initialize the server.
    `protected void` | `initBaseDir()`
    `static void` | `initWebappDefaults(Context ctx)` Static version of `initWebappDefaults(String)`.
    `void` | `initWebappDefaults(String contextPath)` Provide default configuration for a context.
    `String` | `noDefaultWebXmlPath()`
    `void` | `setAddDefaultWebXmlToWebapp(boolean addDefaultWebXmlToWebapp)` By default, when calling addWebapp() to create a Context, the settings from from the default web.xml are added to the context.
    `void` | `setBaseDir(String basedir)` Tomcat needs a directory for temp files.
    `void` | `setConnector(Connector connector)`
    `void` | `setHost(Host host)` Sets the current host - all future webapps will be added to this host.
    `void` | `setHostname(String s)` The the hostname of the default host, default is 'localhost'.
    `void` | `setPort(int port)` Set the port for the default connector.
    `void` | `setSilent(boolean silent)` Controls if the loggers will be silenced or not.
    `void` | `start()` Start the server.
    `void` | `stop()` Stop the server.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### server

          protected Server server

    - #### port

          protected int port

    - #### hostname

          protected String hostname

    - #### basedir

          protected String basedir

    - #### defaultConnectorCreated

          protected boolean defaultConnectorCreated

  - ### Constructor Detail

    - #### Tomcat

          public Tomcat()

  - ### Method Detail

    - #### setBaseDir

          public void setBaseDir(String basedir)

      Tomcat needs a directory for temp files. This should be the first method called.

      By default, if this method is not called, we use:

      - system properties - catalina.base, catalina.home
      - [user.dir]/tomcat.$PORT
      (/tmp doesn't seem a good choice for security).

      TODO: disable work dir if not needed ( no jsp, etc ).

      Parameters:
        `basedir` - The Tomcat base folder on which all others will be derived

    - #### setPort

          public void setPort(int port)

      Set the port for the default connector. Must be called before start().
      Parameters:
        `port` - The port number

    - #### setHostname

          public void setHostname(String s)

      The the hostname of the default host, default is 'localhost'.
      Parameters:
        `s` - The default host name

    - #### addWebapp

          public Context addWebapp(String contextPath,
                          String docBase)

      This is equivalent to adding a web application to a Host's appBase (usually Tomcat's webapps directory). By default, the equivalent of the default web.xml will be applied to the web application (see `initWebappDefaults(String)`). This may be prevented by calling `setAddDefaultWebXmlToWebapp(boolean)` with `false`. Any `WEB-INF/web.xml` and `META-INF/context.xml` packaged with the application will always be processed and normal web fragment and `ServletContainerInitializer` processing will always be applied.
      Parameters:
        `contextPath` - The context mapping to use, "" for root context.
        `docBase` - Base directory for the context, for static files. Must exist, relative to the server home
      Returns:
        the deployed context

    - #### addWebapp

          public Context addWebapp(String contextPath,
                          URL source)
                            throws IOException

      Copy the specified WAR file to the Host's appBase and then call `addWebapp(String, String)` with the newly copied WAR. The WAR will NOT be removed from the Host's appBase when the Tomcat instance stops. Note that `ExpandWar` provides utility methods that may be used to delete the WAR and/or expanded directory if required.
      Parameters:
        `contextPath` - The context mapping to use, "" for root context.
        `source` - The location from which the WAR should be copied
      Returns:
        The deployed Context
      Throws:
        `IOException` - If an I/O error occurs while copying the WAR file from the specified URL to the appBase

    - #### addContext

          public Context addContext(String contextPath,
                           String docBase)

      Add a context - programmatic mode, no default web.xml used. This means that there is no JSP support (no JSP servlet), no default servlet and no web socket support unless explicitly enabled via the programmatic interface. There is also no `ServletContainerInitializer` processing and no annotation processing. If a `ServletContainerInitializer` is added programmatically, there will still be no scanning for `HandlesTypes` matches.

      API calls equivalent with web.xml:

          // context-param
            ctx.addParameter("name", "value");

            // error-page
            ErrorPage ep = new ErrorPage();
            ep.setErrorCode(500);
            ep.setLocation("/error.html");
            ctx.addErrorPage(ep);

            ctx.addMimeMapping("ext", "type");

      Note: If you reload the Context, all your configuration will be lost. If you need reload support, consider using a LifecycleListener to provide your configuration.

      TODO: add the rest

      Parameters:
        `contextPath` - The context mapping to use, "" for root context.
        `docBase` - Base directory for the context, for static files. Must exist, relative to the server home
      Returns:
        the deployed context

    - #### addServlet

          public Wrapper addServlet(String contextPath,
                           String servletName,
                           String servletClass)

      Equivalent to <servlet><servlet-name><servlet-class>.

      In general it is better/faster to use the method that takes a Servlet as param - this one can be used if the servlet is not commonly used, and want to avoid loading all deps. ( for example: jsp servlet ) You can customize the returned servlet, ex:

              wrapper.addInitParameter("name", "value");

      Parameters:
        `contextPath` - Context to add Servlet to
        `servletName` - Servlet name (used in mappings)
        `servletClass` - The class to be used for the Servlet
      Returns:
        The wrapper for the servlet

    - #### addServlet

          public static Wrapper addServlet(Context ctx,
                           String servletName,
                           String servletClass)

      Static version of `addServlet(String, String, String)`
      Parameters:
        `ctx` - Context to add Servlet to
        `servletName` - Servlet name (used in mappings)
        `servletClass` - The class to be used for the Servlet
      Returns:
        The wrapper for the servlet

    - #### addServlet

          public Wrapper addServlet(String contextPath,
                           String servletName,
                           Servlet servlet)

      Add an existing Servlet to the context with no class.forName or initialisation.
      Parameters:
        `contextPath` - Context to add Servlet to
        `servletName` - Servlet name (used in mappings)
        `servlet` - The Servlet to add
      Returns:
        The wrapper for the servlet

    - #### addServlet

          public static Wrapper addServlet(Context ctx,
                           String servletName,
                           Servlet servlet)

      Static version of `addServlet(String, String, Servlet)`.
      Parameters:
        `ctx` - Context to add Servlet to
        `servletName` - Servlet name (used in mappings)
        `servlet` - The Servlet to add
      Returns:
        The wrapper for the servlet

    - #### init

          public void init()
                    throws LifecycleException

      Initialize the server.
      Throws:
        `LifecycleException` - Init error

    - #### start

          public void start()
                     throws LifecycleException

      Start the server.
      Throws:
        `LifecycleException` - Start error

    - #### stop

          public void stop()
                    throws LifecycleException

      Stop the server.
      Throws:
        `LifecycleException` - Stop error

    - #### destroy

          public void destroy()
                       throws LifecycleException

      Destroy the server. This object cannot be used once this method has been called.
      Throws:
        `LifecycleException` - Destroy error

    - #### addUser

          public void addUser(String user,
                     String pass)

      Add a user for the in-memory realm. All created apps use this by default, can be replaced using setRealm().
      Parameters:
        `user` - The user name
        `pass` - The password

    - #### addRole

          public void addRole(String user,
                     String role)

      Add a role to a user.
      Parameters:
        `user` - The user name
        `role` - The role name
      See Also:
        `addUser(String, String)`

    - #### getConnector

          public Connector getConnector()

      Get the default http connector. You can set more parameters - the port is already initialized.

      Alternatively, you can construct a Connector and set any params, then call addConnector(Connector)

      Returns:
        A connector object that can be customized

    - #### setConnector

          public void setConnector(Connector connector)

    - #### getService

          public Service getService()

      Get the service object. Can be used to add more connectors and few other global settings.
      Returns:
        The service

    - #### setHost

          public void setHost(Host host)

      Sets the current host - all future webapps will be added to this host. When tomcat starts, the host will be the default host.
      Parameters:
        `host` - The current host

    - #### getHost

          public Host getHost()

    - #### getEngine

          public Engine getEngine()

      Access to the engine, for further customization.
      Returns:
        The engine

    - #### getServer

          public Server getServer()

      Get the server object. You can add listeners and few more customizations. JNDI is disabled by default.
      Returns:
        The Server

    - #### addContext

          public Context addContext(Host host,
                           String contextPath,
                           String dir)

      Parameters:
        `host` - The host in which the context will be deployed
        `contextPath` - The context mapping to use, "" for root context.
        `dir` - Base directory for the context, for static files. Must exist, relative to the server home
      Returns:
        the deployed context
      See Also:
        `addContext(String, String)`

    - #### addContext

          public Context addContext(Host host,
                           String contextPath,
                           String contextName,
                           String dir)

      Parameters:
        `host` - The host in which the context will be deployed
        `contextPath` - The context mapping to use, "" for root context.
        `contextName` - The context name
        `dir` - Base directory for the context, for static files. Must exist, relative to the server home
      Returns:
        the deployed context
      See Also:
        `addContext(String, String)`

    - #### addWebapp

          public Context addWebapp(Host host,
                          String contextPath,
                          String docBase)

      This is equivalent to adding a web application to a Host's appBase (usually Tomcat's webapps directory). By default, the equivalent of the default web.xml will be applied to the web application (see `initWebappDefaults(String)`). This may be prevented by calling `setAddDefaultWebXmlToWebapp(boolean)` with `false`. Any `WEB-INF/web.xml` and `META-INF/context.xml` packaged with the application will always be processed and normal web fragment and `ServletContainerInitializer` processing will always be applied.
      Parameters:
        `host` - The host in which the context will be deployed
        `contextPath` - The context mapping to use, "" for root context.
        `docBase` - Base directory for the context, for static files. Must exist, relative to the server home
      Returns:
        the deployed context

    - #### addWebapp

          @Deprecated
          public Context addWebapp(Host host,
                                     String contextPath,
                                     String docBase,
                                     ContextConfig config)

      Deprecated. Use `addWebapp(Host, String, String, LifecycleListener)` instead
      Parameters:
        `host` - The host in which the context will be deployed
        `contextPath` - The context mapping to use, "" for root context.
        `docBase` - Base directory for the context, for static files. Must exist, relative to the server home
        `config` - Custom context configurator helper
      Returns:
        the deployed context
      See Also:
        `addWebapp(String, String)`

    - #### addWebapp

          public Context addWebapp(Host host,
                          String contextPath,
                          String docBase,
                          LifecycleListener config)

      This is equivalent to adding a web application to a Host's appBase (usually Tomcat's webapps directory). By default, the equivalent of the default web.xml will be applied to the web application (see `initWebappDefaults(String)`). This may be prevented by calling `setAddDefaultWebXmlToWebapp(boolean)` with `false`. Any `WEB-INF/web.xml` and `META-INF/context.xml` packaged with the application will always be processed and normal web fragment and `ServletContainerInitializer` processing will always be applied.
      Parameters:
        `host` - The host in which the context will be deployed
        `contextPath` - The context mapping to use, "" for root context.
        `docBase` - Base directory for the context, for static files. Must exist, relative to the server home
        `config` - Custom context configuration helper. Any configuration will be in addition to equivalent of the default web.xml configuration described above.
      Returns:
        the deployed context

    - #### getDefaultWebXmlListener

          public LifecycleListener getDefaultWebXmlListener()

      Return a listener that provides the required configuration items for JSP processing. From the standard Tomcat global web.xml. Pass this to `Lifecycle.addLifecycleListener(LifecycleListener)` and then pass the result of `noDefaultWebXmlPath()` to `ContextConfig.setDefaultWebXml(String)`.
      Returns:
        a listener object that configures default JSP processing.

    - #### noDefaultWebXmlPath

          public String noDefaultWebXmlPath()

      Returns:
        a pathname to pass to `ContextConfig.setDefaultWebXml(String)` when using `getDefaultWebXmlListener()`.

    - #### createDefaultRealm

          protected Realm createDefaultRealm()

      Create an in-memory realm. You can replace it for contexts with a real one. The Realm created here will be added to the Engine by default and may be replaced at the Engine level or over-ridden (as per normal Tomcat behaviour) at the Host or Context level.
      Returns:
        a realm instance

    - #### initBaseDir

          protected void initBaseDir()

    - #### setSilent

          public void setSilent(boolean silent)

      Controls if the loggers will be silenced or not.
      Parameters:
        `silent` - `true` sets the log level to WARN for the loggers that log information on Tomcat start up. This prevents the usual startup information being logged. `false` sets the log level to the default level of INFO.

    - #### setAddDefaultWebXmlToWebapp

          public void setAddDefaultWebXmlToWebapp(boolean addDefaultWebXmlToWebapp)

      By default, when calling addWebapp() to create a Context, the settings from from the default web.xml are added to the context. Calling this method with a `false` value prior to calling addWebapp() allows to opt out of the default settings. In that event you will need to add the configurations yourself, either programmatically or by using web.xml deployment descriptors.
      Parameters:
        `addDefaultWebXmlToWebapp` - `false` will prevent the class from automatically adding the default settings when calling addWebapp(). `true` will add the default settings and is the default behavior.
      See Also:
        `addWebapp(Host, String, String, LifecycleListener)`

    - #### enableNaming

          public void enableNaming()

      Enables JNDI naming which is disabled by default. Server must implement `Lifecycle` in order for the `NamingContextListener` to be used.

    - #### initWebappDefaults

          public void initWebappDefaults(String contextPath)

      Provide default configuration for a context. This is broadly the programmatic equivalent of the default web.xml and provides the following features:
      - Default servlet mapped to "/"
      - JSP servlet mapped to "*.jsp" and ""*.jspx"
      - Session timeout of 30 minutes
      - MIME mappings (subset of those in conf/web.xml)
      - Welcome files
      TODO: Align the MIME mappings with conf/web.xml - possibly via a common file.
      Parameters:
        `contextPath` - The path of the context to set the defaults for

    - #### initWebappDefaults

          public static void initWebappDefaults(Context ctx)

      Static version of `initWebappDefaults(String)`.
      Parameters:
        `ctx` - The context to set the defaults for

    - #### addDefaultMimeTypeMappings

          public static void addDefaultMimeTypeMappings(Context context)

      Add the default MIME type mappings to the provide Context.
      Parameters:
        `context` - The web application to which the default MIME type mappings should be added.

    - #### getWebappConfigFile

          protected URL getWebappConfigFile(String path,
                                String contextName)

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