There is of course some apache log files. Search in your apache configuration files for &#39;Log&#39; keyword, you&#39;ll certainly find plenty of them. Depending on your OS and installation places may vary (in a Typical Linux server it would be /var/log/apache2/[access|error].log).

Having a 503 error in Apache usually means **the proxied page/service is not available**. I assume you&#39;re using tomcat and that means tomcat is either not responding to apache (timeout?) or not even available (down? crashed?). So chances are that it&#39;s a configuration error in the way to connect apache and tomcat or an application inside tomcat that is not even sending a response for apache.

Sometimes, in production servers,  it can as well be that you get too much traffic for the tomcat server, apache handle more request than the proxyied service (tomcat) can accept so the backend became unavailable.

That simple.

Moving my layout into a fluid territory, working on scalable images. Using the img tag and setting max-width to 100% works perfectly, but i&#39;d rather use a div with the image set as its background.

The issue I&#39;m running into is that the image doesn&#39;t scale to the size of the div it&#39;s in the background of. Any way to add markup to the background code to set it to 100% width of it&#39;s container?

&lt;!-- language: lang-css --&gt;

    #one {
		background: url(&#39;../img/blahblah.jpg&#39;) no-repeat;
		max-width: 100%;
    }

Is there a way to use max-width and height for a background image?

I am a bit confused about this both of these look same to me.
Although it may happen that capacity and size may differ on different compilers. how it may differ.
Its also said that if we are out of memory the capacity changes.

All these things are bit unclear to me.

Can somebody give an explanation.(if possible with and example or if I can do any test on any program to understand it) 

size vs capacity of a vector?

i am getting the error 503 Service Temporarily Unavailable many times in my application
and i want to detect why this error occurs, how ? if there&#39;s a log file or something like that, since i am not familiar with apache.

second thing is that, is it possible to handle this error, that when it occurs apache is restarted ?

How to Detect cause of 503 Service Temporarily Unavailable error and handle it?

<p>i am getting the error 503 Service Temporarily Unavailable many times in my application
and i want to detect why this error occurs, how ? if there's a log file or something like that, since i am not familiar with apache.</p>
<p>second thing is that, is it possible to handle this error, that when it occurs apache is restarted ?</p>


&gt; **NOTE: If you experience this issue as well, please upvote it on Apache JIRA:**
&gt;
&gt; https://issues.apache.org/jira/browse/XALANJ-2540


I have come to an astonishing conclusion that this:

    Element e = (Element) document.getElementsByTagName(&quot;SomeElementName&quot;).item(0);
    String result = ((Element) e).getTextContent();

Seems to be an incredible 100x faster than this:

    // Accounts for 30%, can be cached
    XPathFactory factory = XPathFactory.newInstance();

    // Negligible
    XPath xpath = factory.newXPath();

    // Negligible
    XPathExpression expression = xpath.compile(&quot;//SomeElementName&quot;);

    // Accounts for 70%
    String result = (String) expression.evaluate(document, XPathConstants.STRING);

I&#39;m using the JVM&#39;s default implementation of JAXP:

    org.apache.xpath.jaxp.XPathFactoryImpl
    org.apache.xpath.jaxp.XPathImpl

I&#39;m really confused, because it&#39;s easy to see how JAXP could optimise the above XPath query to actually execute a simple `getElementsByTagName()` instead. But it doesn&#39;t seem to do that. This problem is limited to around 5-6 frequently used XPath calls, that are abstracted and hidden by an API. Those queries involve simple paths (e.g. `/a/b/c`, no variables, conditions) against an always available DOM Document only. So, if an optimisation can be done, it will be quite easy to achieve.

My question: Is XPath&#39;s slowness an accepted fact, or am I overlooking something? Is there a better (faster) implementation? Or should I just avoid XPath altogether, for simple queries?

Java XPath (Apache JAXP implementation) performance

    The server encountered an internal error or misconfiguration and was unable to complete your request.
    
    Please contact the server administrator, nkutty@bics.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
    
    More information about this error may be available in the server error log.
    Apache/2.2.0 (Fedora) Server at bbt.com Port 80

This works fine in my local system but it is not working in the server. Can anyone help to figure out why it is?
Thanks in advance!

The server encountered an internal error or misconfiguration and was unable to complete your request

I am trying to deploy mod_wsgi with apache to run a django application but I am getting an error 500 internal server error The apache logs shows:


    [Thu Jun 23 14:01:47 2011] [error] [client 152.78.95.64] mod_wsgi (pid=16142): Exception occurred processing WSGI script &#39;/home/user/bms/apache/django.wsgi&#39;.
    [Thu Jun 23 14:01:47 2011] [error] [client 152.78.95.64] Traceback (most recent call last):
    [Thu Jun 23 14:01:47 2011] [error] [client 152.78.95.64]   File &quot;/home/user/bms/apache/django.wsgi&quot;, line 13, in &lt;module&gt;
    [Thu Jun 23 14:01:47 2011] [error] [client 152.78.95.64]     import django.core.handlers.wsgi
    [Thu Jun 23 14:01:47 2011] [error] [client 152.78.95.64] ImportError: No module named django.core.handlers.wsgi

My apache virtual host is as follows:

    &lt;VirtualHost *:80&gt;
    
        DocumentRoot /home/user/bms
    
        &lt;Directory /home/user/bms&gt;
            Order allow,deny
            Allow from all
        &lt;/Directory&gt;
    
    WSGIDaemonProcess bms user=user group=user processes=2 threads=25 python-path=/usr/local/lib/python2.7/site-packages

    
        WSGIProcessGroup bms
    
        WSGIScriptAlias / /home/user/bms/apache/django.wsgi
    
    &lt;/VirtualHost&gt;

And the referenced wsgi file in my app directory with 0777 permissions:

    import os
    import sys
    
    path = &#39;/home/user/bms&#39;
    if path not in sys.path:
        sys.path.append(path)
    
    os.environ[&#39;DJANGO_SETTINGS_MODULE&#39;] = &#39;bms.settings&#39;
    
    import django.core.handlers.wsgi
    application = django.core.handlers.wsgi.WSGIHandler()


I heard that this may be because the apache user does not have the correct permissions. However I have no idea how to fix this. I also tried starting the deamon with the www-data user and this did not solve the issue.

**EDIT**:

I solved this by copying the virtual hosts file into the default one and then disabling the old one with a2dissite. I have no idea how I can do it &quot;properly&quot; and set it so apache goes to the virtual host I want it to though.

Target WSGI script cannot be loaded as Python module

I have a Ubuntu server running Apache2 with PHP 5. In the php.ini I set `display_errors =  On` and `error_reporting =  E_ALL | E_STRICT`, but PHP is still not displaying error messages. I&#39;m also using Apache virtual hosts.

Also, what is the most strict error reporting PHP5.3 has to offer? I want my code to as up-to-date and future-proof as possible.

PHP not displaying errors even though display_errors = On

We have some very basic mod_rewrite rules:

    RewriteRule ^something.swf$ http://www.newdomain.com/something.swf [R=302,L]

mod_rewrite seems to do its job, and if the user is accessing:

`something.swf?param=value`, it is redirected correctly to `http://www.newdomain.com/something.swf?param=value`

the problem is in this situation:

    www.olddomain.com/something.swf?param=URL_ENCODED_VALUE

what ends up happening is mod_rewrite takes it upon it self to re-urlencode the query string param

so what the user ends up with is:

    www.olddomain.com/something.swf?param=URL_ENCODED_VALUE

REDIRECTED TO

    www.newdomain.com/something.swf?param=URL_ENCODED_VALUE_OF_URL_ENCODED_VALUE

so we end up with a double-urlencoded value. boourns!

While I do understand we could make a `\?(.*)` ... `?$1` rule for this, I am thinking there must be a way to tell mod_rewrite NOT to urlencode the query string params... we would like to avoid using 2 rules since valid paths are:

    something.swf (no query string)

and

    something.swf?someparams...

so yea, ideally... just tell mod_rewrite: please, no urlencoding of query string params... just direct passthru to the new URL via `R=302`.

mod_rewrite urlencoding an already urlencoded query string parameter - any way to disable this?

In my application, I had a servlet which was defined like this in the *web.xml*:

&lt;!-- language: lang-xml --&gt;

    &lt;servlet&gt;
		&lt;display-name&gt;Notification Servlet&lt;/display-name&gt;
		&lt;servlet-name&gt;NotificationServlet&lt;/servlet-name&gt;
		&lt;servlet-class&gt;com.XXX.servlet.NotificationServlet&lt;/servlet-class&gt;
		&lt;load-on-startup&gt;1&lt;/load-on-startup&gt;
	&lt;/servlet&gt;
	&lt;servlet-mapping&gt;
		&lt;servlet-name&gt;NotificationServlet&lt;/servlet-name&gt;
		&lt;url-pattern&gt;/notification/*&lt;/url-pattern&gt;
	&lt;/servlet-mapping&gt;

After moving to use Tomcat 7, I would like to use the `@WebServlet` annotation that will do the job.  
Here is the way I did it:

    @WebServlet( name=&quot;NotificationServlet&quot;, displayName=&quot;Notification Servlet&quot;, urlPatterns = {&quot;/notification&quot;}, loadOnStartup=1)
    public class NotificationServlet extends HttpServlet {


And it does not work.
Could someone please tell me what I did wrong?


@WebServlet annotation with Tomcat 7

I was trying to adjust initial heap size of a tomcat 7 (CentOS, java -version: 1.6.0_25-b06) instance by adding the following line to catalina.sh:

    export CATALINA_OPTS=&quot;-Xms=512M -Xmx=1024M&quot;

Starting up tomcat fails and logs the following message to catalina.out:

    Invalid initial heap size: -Xms=512m
    Could not create the Java virtual machine.

What is wrong with these options?

Tomcat 7: How to set initial heap size correctly?

I know that I can rename my webapp (or it&#39;s WAR file) to **ROOT** but this is a terrible way to do it, IMHO. Now I checked out the tomcat doc &amp; it says 

&gt; It is NOT recommended to place &lt;Context&gt; elements directly in the
&gt; server.xml file

So I tried doing it another method that it suggested.

&gt; Individual Context elements may be explicitly defined: In an
&gt; individual file at /META-INF/context.xml inside the application files.

So I created a `/META-INF/context.xml` with the following code,

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
    &lt;Context antiJARLocking=&quot;true&quot; path=&quot;/&quot;/&gt;


But after deploying when I restarted the server it still failed to load the context at &quot;/&quot;, it still loaded it with the `&quot;/&lt;WEB_APP_NAME&gt;&quot;`

Any pointers helpful.


How to set the context path of a web application in Tomcat 7.0

Setup:

 - Eclipse 3.7 + the WEB tools from the indigo update site
 - Tomcat7
 - Ubuntu

Problem:

When I try to add a new Tomcat 7 server in the server perspective in Eclipse I get the following error:

    &quot;Cannot create a server using the selected type&quot; 

How do I solve this?

Eclipse 3.7 (Indigo) + Tomcat7 --- Cannot create a server using the selected type

I am using JDK 1.7, Apache Tomcat 7.0.23 and I have placed JSTL core library(1.2) and STANDARD jar in WEB_INF lib folder it is not giving me any warning but when I will try to run the code 

&lt;!-- language: lang-html --&gt;

    &lt;%@ taglib uri=&quot;http://java.sun.com/jsp/jstl/core&quot; prefix=&quot;c&quot; %&gt;
    &lt;!DOCTYPE html PUBLIC &quot;-//W3C//DTD HTML 4.01 Transitional//EN&quot; &quot;http://www.w3.org/TR/html4/loose.dtd&quot;&gt;
    &lt;!-- Create Bean Instance--&gt;
    &lt;jsp:useBean id=&quot;listdomain&quot; class=&quot;bean.PopulateMultiDomain&quot; scope=&quot;session&quot;&gt;&lt;/jsp:useBean&gt;
    
    &lt;jsp:setProperty property=&quot;*&quot; name=&quot;listdomain&quot;/&gt;
    
    &lt;c:forEach var=&quot;item&quot; items=&quot;${listdomain.status}&quot;&gt;
        &lt;option&gt;
            &lt;c:out value=&quot;${item}&quot; /&gt;
        &lt;/option&gt;
    &lt;/c:forEach&gt; 

it gives me the following error:

&lt;!-- language: none --&gt;

    org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
    	org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:56)
    	org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:410)
    	org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:117)
    	org.apache.jasper.compiler.TagLibraryInfoImpl.generateTLDLocation(TagLibraryInfoImpl.java:311)
    	org.apache.jasper.compiler.TagLibraryInfoImpl.&lt;init&gt;(TagLibraryInfoImpl.java:152)
    	org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:410)
    	org.apache.jasper.compiler.Parser.parseDirective(Parser.java:475)
    	org.apache.jasper.compiler.Parser.parseElements(Parser.java:1425)
    	org.apache.jasper.compiler.Parser.parse(Parser.java:138)
    	org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242)
    	org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
    	org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
    	org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
    	org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
    	org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
    	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
    	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

Can anyone suggest me what mistake I am making?

The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application

I&#39;m new to `Tomcat`.  We have a dev machine with about 5 apps running.  Even though it&#39;s dev, it&#39;s used by our clients pretty heavily during testing.

So say we need to make one small change on one class file.  Right now, we have to shutdown Tomcat (affecting the other four apps), delete the `WAR` file (and web app directory), redeploy the new `WAR` file and restart `Tomcat`.

Of course, this upsets a few people because it destroys all logged in sessions for all apps.

Is there a better way to do this?  I mean, is there a way to only reload the **CLASS** that changed instead of everything on the dev machine?

Thanks.


How do I update a Tomcat webapp without restarting the entire service?

I have a web application that relies on some resources and parameters to be configured after it is installed, like a JDBC connection.

What I have come up with is providing a `META-INF/context.xml` which is copied into `[engine-name]/[server-name]/[app-name].xml` by Tomcat when I deploy the application. This way all I am providing is a war file that can be copied into the appBase folder (webapps).
Tomcat&#39;s documentation [says][1] if there is such a file it won&#39;t be overwritten which is really great, since the changes made after deployment won&#39;t be lost.

But there is a subtle issue here:
Since we deploy the application by copying into webapps directory, Tomcat will first uninstall the existing application as well as the configuration file. This way the configuration file will be lost / overwritten which is not desirable.
Tomcat [won&#39;t][2] modify this behaviour as far as I know.

The question is:
Is there a way to work around this issue by installing the application in a way that Tomcat won&#39;t remove the existing configuration file.
Or, is there a better way of packaging the application?

Please note that we don&#39;t want to set autoDeploy to false and we cannot use human intervention for the installation (which rules out using Tomcat Manager web application).

If I get the configuration file out of .war file and copy it separately as `[engine-name]/[server-name]/[app-name].xml`, Tomcat will still associate it with my application and remove it once I copy a new .war file.

Another assumption is: We don&#39;t know in advance the values to the configuration. We will only provide a sample configuration (a placeholder, if you wish) while actual configuration will be performed at some time later (not necessarily in the installation time). 

Thanks

  [1]: http://tomcat.apache.org/tomcat-5.5-doc/config/context.html
  [2]: https://issues.apache.org/bugzilla/show_bug.cgi?id=44879

How to provide a context configuration for a web application in Tomcat?

This is the error that I got when I created my first Axis2 web service using Eclipse. After I wrote the class, I created the web service with Apache Axis2. When I click the start server button in eclipse it gives an error message:

&gt; Could not publish server configuration for Tomcat v6.0 Server at
&gt; localhost.  
&gt; **Multiple contexts have a path of &quot;/FirstApache&quot;.**

FirstApache is the dynamic web project that I created before. I selected the correct web project from the configuration part in the web service wizard.

How can I fix this?

Multiple contexts with the same path error running web service in Eclipse using Tomcat

I was given a maven project to compile and get deployed on a tomcat server. I have never used maven before today, but I have been googling quite a bit. It seems like the top level `pom.xml` files in this project have the packaging type set as `pom`.

What am I supposed to do after `mvn install` to get this application deployed? I was expecting to be able to find a `war` file somewhere or something, but I guess I am looking in the wrong place or missing a step.

What is &quot;pom&quot; packaging in maven?

We&#39;re running a 32-bit Windows server 2008 with an IIS version of 7.&lt;br/&gt; We&#39;re attempting to publish an asp.net 4.0 webapp and so far our attempts have only yielded a few warnings in the serverlog without even stopping the 4.0 application pool  


&gt;**A process serving application pool &#39;ASP.NET v4.0&#39; suffered a fatal communication error with the Windows Process Activation Service. The process id was &#39;1904&#39;. The data field contains the error number.** 

The application is running under a 4.0 app-pool and under the default website. &lt;br/&gt;We&#39;ve also got some older .asp&#39;s running flawlessly.&lt;br/&gt;
Even when attempting to publish a barren (read. only 1 line of text) .aspx-file it failed miserably... We&#39;ve since long run out of ideas on what to do so any form of input would be appreciated...


IIS7: A process serving application pool &#39;YYYYY&#39; suffered a fatal communication error with the Windows Process Activation Service

How do you return **503 Service Unavailable** in Rails for the entire application? 

Also, how do you do the same for specific controllers?

Content Type	Original Author	Original Content on Stackoverflow
Question	Mahmoud Saleh	View Question on Stackoverflow
Solution 1 - Apache	regilero	View Answer on Stackoverflow

How to Detect cause of 503 Service Temporarily Unavailable error and handle it?

Apache Problem Overview

Apache Solutions

Solution 1 - Apache

size vs capacity of a vector?

Is there a way to use max-width and height for a background image?

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