User:Cblonda

Cblonda — Wed, 18 Nov 2009 17:52:17 GMT

New user account

New page

User:Richosoft

Richosoft — Wed, 18 Nov 2009 14:14:01 GMT

New user account

New page

Overview

WikiSysop — Mon, 16 Nov 2009 16:16:56 GMT

Fixing Java caching issue

← Older revision		Revision as of 16:16, 16 November 2009
Line 314:		Line 314:
	import net.tanesha.recaptcha.ReCaptchaResponse;		import net.tanesha.recaptcha.ReCaptchaResponse;

-	Next, you need to insert the following line in your code: (This is because reCAPTCHA servers sometimes change IP addresses and Java normally caches DNS forever. The line below tells Java to refresh it's DNS cache frequently so that the connection between your server and the reCAPTCHA servers is not interrupted when there is an IP address change. See "Advanced Note" below.)	+	Next, you need to insert the code that verifies the reCAPTCHA solution entered by the user. The example below (in JSP) shows how this can be done:
-		+
-	~~System.setProperty("networkaddress.cache.ttl", "30");~~	+
-		+
-	~~Finally~~, you need to insert the code that verifies the reCAPTCHA solution entered by the user.	+
-		+
-	~~For~~ example, in JSP ~~the full code may look something like~~ this:	+

	<%@ page import="net.tanesha.recaptcha.ReCaptchaImpl" %>		<%@ page import="net.tanesha.recaptcha.ReCaptchaImpl" %>
Line 327:		Line 321:
	<body>		<body>
	<%		<%
-	~~System.setProperty("networkaddress.cache.ttl", "30");<br>~~
	String remoteAddr = request.getRemoteAddr();		String remoteAddr = request.getRemoteAddr();
	ReCaptchaImpl reCaptcha = new ReCaptchaImpl();		ReCaptchaImpl reCaptcha = new ReCaptchaImpl();
Line 349:		Line 342:
	If you're having trouble, you can also see the following article that explains how to add reCAPTCHA to your Java application: [http://wheelersoftware.com/articles/recaptcha-java.html How to reCAPTCHA Your Java Application]		If you're having trouble, you can also see the following article that explains how to add reCAPTCHA to your Java application: [http://wheelersoftware.com/articles/recaptcha-java.html How to reCAPTCHA Your Java Application]

-	* [[#Part 3: ~~Customizing Look~~ and ~~Feel\|Customizing Look~~ and ~~Feel]]~~	+	=== Important: DNS Caching ===
-	* [~~[#Troubleshooting\|Troubleshooting]~~]	+
		+	Java has an annoying issue that may cause the connection between your server and reCAPTCHA to be interrupted every few months, and reCAPTCHA will stop working in your site when that happens. Read below to see how to fix this.
		+
		+	By default the Java Virtual Machine (JVM) caches all DNS lookups forever instead of using the time-to-live (TTL) value which is specified in the DNS record of each host. For those of you how do not know it, a DNS lookup is a request sent to a DNS server which converts a readable hostname to an IP address. For example, it converts '''www.recaptcha.net''' to the IP address '''69.12.97.164'''. It is of course much more complex than this, and if you want to learn more, [http://en.wikipedia.org/wiki/Domain_Name_System wikipedia's entry on DNS] is a good starting point.
		+
		+	Although not frequently, reCAPTCHA servers can change IP addresses. Because Java caches DNS lookups forever, this can cause the connection between your server and reCAPTCHA to go down when the reCAPTCHA IP address changes. If this happens, restarting your JVM (e.g., restarting Tomcat) can fix the problem because it causes a new DNS lookup. However, you probably don't want to restart your JVM once every few months whenever your site breaks because the reCAPTCHA servers changed IP address.
		+
		+	To fix this issue for good, you can pass '''-Dsun.net.inetaddr.ttl=30''' to your app-server (this tells Java to only cache DNS for 30 seconds). In Tomcat for Windows, this can be done by following the steps below:
		+
		+	1. Stop Tomcat<br>
		+	2. Go to tomcat\bin<br>
		+	3. Run Tomcat5w.exe<br>
		+	4. Goto java tab<br>
		+	5. Add java property to java options section: -Dsun.net.inetaddr.ttl=30<br>
		+	6. Exit<br>
		+	7. Start Tomcat
		+
		+	In Tomcat for Linux or MacOS X, you need to run the following command in the command line and restart Tomcat:
		+
		+	export JAVA_OPTS="$JAVA_OPTS -Dsun.net.inetaddr.ttl=30"

-	~~'''Advanced Note~~:~~''' Although not frequently, reCAPTCHA servers sometimes change IP addresses~~. ~~Java has a bug that causes DNS to be cached forever, which may cause the connection between your servers and reCAPTCHA to go down when the reCAPTCHA IP addresses change~~. ~~You can fix this by passing -Dnetworkaddress~~.~~cache.ttl~~=~~30 to your app-server, or by adding System.setProperty("networkaddress.cache.ttl", "30"); somewhere in your code~~.	+	[http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/1887 Here is an article] explaining more about this issue.

	== Perl ==		== Perl ==

User:Adibe

Adibe — Mon, 16 Nov 2009 14:19:57 GMT

New user account

New page

User:Jitendra55

Jitendra52 — Sun, 15 Nov 2009 13:49:30 GMT

created new account User:Jitendra55

New page

Contributed Plugins

Mconsidine — Sun, 15 Nov 2009 13:33:04 GMT

← Older revision		Revision as of 13:33, 15 November 2009
Line 2:		Line 2:

	This is a page to share user contributed plugins. You can find a number of official plugins as well as a listing of some of our most popular contributed plugins on the [http://recaptcha.net/resources.html reCAPTCHA resources page]		This is a page to share user contributed plugins. You can find a number of official plugins as well as a listing of some of our most popular contributed plugins on the [http://recaptcha.net/resources.html reCAPTCHA resources page]
		+
		+	===MODx===
		+	Recaptcha can be incorporated into the eForm and SPForm components of MODx by following these tutorials :
		+
		+	For eForm : http://modxcms.com/forums/index.php/topic,41869.msg252530.html#msg252530
		+
		+	For SPForm : http://modxcms.com/forums/index.php/topic,42131.0.html
		+
		+	An example of using Mailhide can be found here : http://modxcms.com/forums/index.php/topic,42270.0.html
		+
		+	In all cases, the recaptchalib.php file was located in assets/snippets/recaptcha, though this can be changed.
		+	Private/public keys were also stored there for convenience. Should any issues be found with this implementation over time, notice will most likely be found in those forum threads.

	===Erlang===		===Erlang===

User:Mconsidine

Mconsidine — Sun, 15 Nov 2009 13:26:32 GMT

New user account

New page

reCAPTCHA Wiki - Recent changes [en]

User:Cblonda

User:Richosoft

Overview

User:Adibe

User:Jitendra55

Contributed Plugins

User:Mconsidine