Package org.apache.catalina.manager

Class HTMLManagerServlet

java.lang.Object

jakarta.servlet.GenericServlet

jakarta.servlet.http.HttpServlet

org.apache.catalina.manager.ManagerServlet

org.apache.catalina.manager.HTMLManagerServlet

All Implemented Interfaces:

Servlet, ServletConfig, Serializable, ContainerServlet

public final class HTMLManagerServlet
extends ManagerServlet

Servlet that enables remote management of the web applications deployed within the same virtual host as this web application is. Normally, this functionality will be protected by a security constraint in the web application deployment descriptor. However, this requirement can be relaxed during testing.

The difference between the ManagerServlet and this Servlet is that this Servlet prints out an HTML interface which makes it easier to administrate.

However if you use a software that parses the output of ManagerServlet you won't be able to upgrade to this Servlet since the output are not in the same format ar from ManagerServlet

Author:

Bip Thelin, Malcolm Edgar, Glenn L. Nielsen

See Also:

• ManagerServlet
• Serialized Form

Field Summary

Fields inherited from class org.apache.catalina.manager.ManagerServlet

configBase, context, debug, global, host, mBeanServer, oname, sm, versioned, wrapper

Fields inherited from class jakarta.servlet.http.HttpServlet

LEGACY_DO_HEAD

Constructor Summary

Constructors

Constructor	Description
HTMLManagerServlet()

Method Summary

Modifier and Type	Method	Description
protected String	deployInternal(String config, ContextName cn, String war, StringManager smClient)	Deploy an application for the specified path from the specified web application archive.
protected void	displaySessionDetailPage(HttpServletRequest req, HttpServletResponse resp, ContextName cn, String sessionId, StringManager smClient)	Display session details.
protected void	displaySessionsListPage(ContextName cn, HttpServletRequest req, HttpServletResponse resp, StringManager smClient)	List session.
void	doGet(HttpServletRequest request, HttpServletResponse response)	Called by the server (via the service method) to allow a servlet to handle a GET request.
void	doPost(HttpServletRequest request, HttpServletResponse response)	Called by the server (via the service method) to allow a servlet to handle a POST request.
protected void	doSessions(ContextName cn, HttpServletRequest req, HttpServletResponse resp, StringManager smClient)	Handle session operations.
protected String	expireSessions(ContextName cn, HttpServletRequest req, StringManager smClient)	Extract the expiration request parameter
protected String	findleaks(StringManager smClient)	Find potential memory leaks caused by web application reload.
protected Comparator<Session>	getComparator(String sortBy)
String	getServletInfo()	Returns information about the servlet, such as author, version, and copyright.
protected Session	getSessionForNameAndId(ContextName cn, String id, StringManager smClient)
protected List<Session>	getSessionsForName(ContextName cn, StringManager smClient)
void	init()	A convenience method which can be overridden so that there's no need to call super.init(config).
protected int	invalidateSessions(ContextName cn, String[] sessionIds, StringManager smClient)	Invalidate specified sessions.
protected void	list(HttpServletRequest request, HttpServletResponse response, String message, StringManager smClient)	Render an HTML list of the currently active Contexts in our virtual host, and memory and server status information.
protected String	reload(ContextName cn, StringManager smClient)	Reload the web application at the specified context path.
protected boolean	removeSessionAttribute(ContextName cn, String sessionId, String attributeName, StringManager smClient)	Removes an attribute from an HttpSession
protected String	sessions(ContextName cn, int idle, StringManager smClient)	Display session information and invoke list.
protected void	sslConnectorCerts(HttpServletRequest request, HttpServletResponse response, StringManager smClient)
protected void	sslConnectorCiphers(HttpServletRequest request, HttpServletResponse response, StringManager smClient)
protected void	sslConnectorTrustedCerts(HttpServletRequest request, HttpServletResponse response, StringManager smClient)
protected String	sslReload(String tlsHostName, StringManager smClient)
protected String	start(ContextName cn, StringManager smClient)	Start the web application at the specified context path.
protected String	stop(ContextName cn, StringManager smClient)	Stop the web application at the specified context path.
protected String	undeploy(ContextName cn, StringManager smClient)	Undeploy the web application at the specified context path.
protected String	upload(HttpServletRequest request, StringManager smClient)

Methods inherited from class org.apache.catalina.manager.ManagerServlet

check, deploy, deploy, deploy, destroy, doPut, expireSessions, findleaks, getConnectorCerts, getConnectorCiphers, getConnectorTrustedCerts, getWrapper, isDeployed, list, printResources, reload, removeServiced, resources, save, serverinfo, sessions, setWrapper, sslConnectorCiphers, sslReload, start, stop, threadDump, tryAddServiced, undeploy, uploadWar, validateContextName, vmInfo

Methods inherited from class jakarta.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPatch, doTrace, getLastModified, init, isSensitiveHeader, service, service

Methods inherited from class jakarta.servlet.GenericServlet

getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletName, log, log

Methods inherited from class java.lang.Object

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

Constructor Details

HTMLManagerServlet

public HTMLManagerServlet()

Method Details

doGet

public void doGet(HttpServletRequest request,
 HttpServletResponse response)
           throws IOException,
ServletException

Description copied from class: jakarta.servlet.http.HttpServlet

Called by the server (via the service method) to allow a servlet to handle a GET request.

Overriding this method to support a GET request also automatically supports an HTTP HEAD request. A HEAD request is a GET request that returns no body in the response, only the request header fields.

When overriding this method, read the request data, write the response headers, get the response's Writer or output stream object, and finally, write the response data. It's best to include content type and encoding. When using a PrintWriter object to return the response, set the content type before accessing the PrintWriter object.

The servlet container must write the headers before committing the response, because in HTTP the headers must be sent before the response body.

Where possible, set the Content-Length header (with the ServletResponse.setContentLength(int) method), to allow the servlet container to use a persistent connection to return its response to the client, improving performance. The content length is automatically set if the entire response fits inside the response buffer.

When using HTTP 1.1 chunked encoding (which means that the response has a Transfer-Encoding header), do not set the Content-Length header.

The GET method should be safe, that is, without any side effects for which users are held responsible. For example, most form queries have no side effects. If a client request is intended to change stored data, the request should use some other HTTP method.

The GET method should also be idempotent, meaning that it can be safely repeated. Sometimes making a method safe also makes it idempotent. For example, repeating queries is both safe and idempotent, but buying a product online or modifying data is neither safe nor idempotent.

If the request is incorrectly formatted, doGet returns an HTTP "Bad Request" message.

Overrides:

doGet in class ManagerServlet

Parameters:

request - an HttpServletRequest object that contains the request the client has made of the servlet

response - an HttpServletResponse object that contains the response the servlet sends to the client

Throws:

IOException - if an input or output error is detected when the servlet handles the GET request

ServletException - if the request for the GET could not be handled

See Also:

• ServletResponse.setContentType(java.lang.String)

doPost

public void doPost(HttpServletRequest request,
 HttpServletResponse response)
            throws IOException,
ServletException

Description copied from class: jakarta.servlet.http.HttpServlet

Called by the server (via the service method) to allow a servlet to handle a POST request. The HTTP POST method allows the client to send data of unlimited length to the Web server a single time and is useful when posting information such as credit card numbers.

When overriding this method, read the request data, write the response headers, get the response's Writer or output stream object, and finally, write the response data. It's best to include content type and encoding. When using a PrintWriter object to return the response, set the content type before accessing the PrintWriter object.

The servlet container must write the headers before committing the response, because in HTTP the headers must be sent before the response body.

Where possible, set the Content-Length header (with the ServletResponse.setContentLength(int) method), to allow the servlet container to use a persistent connection to return its response to the client, improving performance. The content length is automatically set if the entire response fits inside the response buffer.

When using HTTP 1.1 chunked encoding (which means that the response has a Transfer-Encoding header), do not set the Content-Length header.

This method does not need to be either safe or idempotent. Operations requested through POST can have side effects for which the user can be held accountable, for example, updating stored data or buying items online.

If the HTTP POST request is incorrectly formatted, doPost returns an HTTP "Bad Request" message.

Overrides:

doPost in class HttpServlet

Parameters:

request - an HttpServletRequest object that contains the request the client has made of the servlet

response - an HttpServletResponse object that contains the response the servlet sends to the client

Throws:

IOException - if an input or output error is detected when the servlet handles the request

ServletException - if the request for the POST could not be handled

See Also:

• ServletOutputStream
• ServletResponse.setContentType(java.lang.String)

upload

protected String upload(HttpServletRequest request,
 StringManager smClient)

deployInternal

protected String deployInternal(String config,
 ContextName cn,
 String war,
 StringManager smClient)

Deploy an application for the specified path from the specified web application archive.

Parameters:

config - URL of the context configuration file to be deployed

cn - Name of the application to be deployed

war - URL of the web application archive to be deployed

smClient - internationalized strings

Returns:

message String

list

protected void list(HttpServletRequest request,
 HttpServletResponse response,
 String message,
 StringManager smClient)
             throws IOException

Render an HTML list of the currently active Contexts in our virtual host, and memory and server status information.

Parameters:

request - The request

response - The response

message - a message to display

smClient - internationalized strings

Throws:

IOException - an IO error occurred

reload

protected String reload(ContextName cn,
 StringManager smClient)

Reload the web application at the specified context path.

Parameters:

cn - Name of the application to be restarted

smClient - StringManager for the client's locale

Returns:

message String

See Also:

• ManagerServlet.reload(PrintWriter, ContextName, StringManager)

undeploy

protected String undeploy(ContextName cn,
 StringManager smClient)

Undeploy the web application at the specified context path.

Parameters:

cn - Name of the application to be undeployed

smClient - StringManager for the client's locale

Returns:

message String

See Also:

• ManagerServlet.undeploy(PrintWriter, ContextName, StringManager)

sessions

protected String sessions(ContextName cn,
 int idle,
 StringManager smClient)

Display session information and invoke list.

Parameters:

cn - Name of the application to list session information

idle - Expire all sessions with idle time ≥ idle for this context

smClient - StringManager for the client's locale

Returns:

message String

See Also:

• ManagerServlet.sessions(PrintWriter, ContextName, int, StringManager)

start

protected String start(ContextName cn,
 StringManager smClient)

Start the web application at the specified context path.

Parameters:

cn - Name of the application to be started

smClient - StringManager for the client's locale

Returns:

message String

See Also:

• ManagerServlet.start(PrintWriter, ContextName, StringManager)

stop

protected String stop(ContextName cn,
 StringManager smClient)

Stop the web application at the specified context path.

Parameters:

cn - Name of the application to be stopped

smClient - StringManager for the client's locale

Returns:

message String

See Also:

• ManagerServlet.stop(PrintWriter, ContextName, StringManager)

findleaks

protected String findleaks(StringManager smClient)

Find potential memory leaks caused by web application reload.

Parameters:

smClient - StringManager for the client's locale

Returns:

message String

See Also:

• ManagerServlet.findleaks(boolean, PrintWriter, StringManager)

sslReload

protected String sslReload(String tlsHostName,
 StringManager smClient)

sslConnectorCiphers

protected void sslConnectorCiphers(HttpServletRequest request,
 HttpServletResponse response,
 StringManager smClient)
                            throws ServletException,
IOException

Throws:

ServletException

IOException

sslConnectorCerts

protected void sslConnectorCerts(HttpServletRequest request,
 HttpServletResponse response,
 StringManager smClient)
                          throws ServletException,
IOException

Throws:

ServletException

IOException

sslConnectorTrustedCerts

protected void sslConnectorTrustedCerts(HttpServletRequest request,
 HttpServletResponse response,
 StringManager smClient)
                                 throws ServletException,
IOException

Throws:

ServletException

IOException

getServletInfo

public String getServletInfo()

Description copied from class: jakarta.servlet.GenericServlet

Returns information about the servlet, such as author, version, and copyright. By default, this method returns an empty string. Override this method to have it return a meaningful value. See Servlet.getServletInfo().

Specified by:

getServletInfo in interface Servlet

Overrides:

getServletInfo in class GenericServlet

Returns:

String information about this servlet, by default an empty string

init

public void init()
          throws ServletException

Description copied from class: jakarta.servlet.GenericServlet

A convenience method which can be overridden so that there's no need to call super.init(config).

Instead of overriding GenericServlet.init(ServletConfig), simply override this method and it will be called by GenericServlet.init(ServletConfig config). The ServletConfig object can still be retrieved via GenericServlet.getServletConfig().

Overrides:

init in class ManagerServlet

Throws:

ServletException - if an exception occurs that interrupts the servlet's normal operation

expireSessions

protected String expireSessions(ContextName cn,
 HttpServletRequest req,
 StringManager smClient)

Extract the expiration request parameter

Parameters:

cn - Name of the application from which to expire sessions

req - The Servlet request

smClient - StringManager for the client's locale

Returns:

message string

doSessions

protected void doSessions(ContextName cn,
 HttpServletRequest req,
 HttpServletResponse resp,
 StringManager smClient)
                   throws ServletException,
IOException

Handle session operations.

Parameters:

cn - Name of the application for the sessions operation

req - The Servlet request

resp - The Servlet response

smClient - StringManager for the client's locale

Throws:

ServletException - Propagated Servlet error

IOException - An IO error occurred

getSessionsForName

protected List<Session> getSessionsForName(ContextName cn,
 StringManager smClient)

getSessionForNameAndId

protected Session getSessionForNameAndId(ContextName cn,
 String id,
 StringManager smClient)

displaySessionsListPage

protected void displaySessionsListPage(ContextName cn,
 HttpServletRequest req,
 HttpServletResponse resp,
 StringManager smClient)
                                throws ServletException,
IOException

List session.

Parameters:

cn - Name of the application for which the sessions will be listed

req - The Servlet request

resp - The Servlet response

smClient - StringManager for the client's locale

Throws:

ServletException - Propagated Servlet error

IOException - An IO error occurred

displaySessionDetailPage

protected void displaySessionDetailPage(HttpServletRequest req,
 HttpServletResponse resp,
 ContextName cn,
 String sessionId,
 StringManager smClient)
                                 throws ServletException,
IOException

Display session details.

Parameters:

req - The Servlet request

resp - The Servlet response

cn - Name of the application for which the sessions will be listed

sessionId - the session id

smClient - StringManager for the client's locale

Throws:

ServletException - Propagated Servlet error

IOException - An IO error occurred

invalidateSessions

protected int invalidateSessions(ContextName cn,
 String[] sessionIds,
 StringManager smClient)

Invalidate specified sessions.

Parameters:

cn - Name of the application for which sessions are to be invalidated

sessionIds - the session ids of the sessions

smClient - StringManager for the client's locale

Returns:

number of invalidated sessions

removeSessionAttribute

protected boolean removeSessionAttribute(ContextName cn,
 String sessionId,
 String attributeName,
 StringManager smClient)

Removes an attribute from an HttpSession

Parameters:

cn - Name of the application hosting the session from which the attribute is to be removed

sessionId - the session id

attributeName - the attribute name

smClient - StringManager for the client's locale

Returns:

true if there was an attribute removed, false otherwise

getComparator

protected Comparator<Session> getComparator(String sortBy)