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  • Servlet that starts a thread only once for every visitor

    - by user858749
    Hey I want to implement a Java Servlet that starts a thread only once for every single user. Even on refresh it should not start again. My last approach brought me some trouble so no code^^. Any Suggestions for the layout of the servlet? public class LoaderServlet extends HttpServlet { // The thread to load the needed information private LoaderThread loader; // The last.fm account private String lfmaccount; public LoaderServlet() { super(); lfmaccount = ""; } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { if (loader != null) { response.setContentType("text/plain"); response.setHeader("Cache-Control", "no-cache"); PrintWriter out = response.getWriter(); out.write(loader.getStatus()); out.flush(); out.close(); } else { loader = new LoaderThread(lfmaccount); loader.start(); request.getRequestDispatcher("WEB-INF/pages/loader.jsp").forward( request, response); } } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { if (lfmaccount.isEmpty()) { lfmaccount = request.getSession().getAttribute("lfmUser") .toString(); } request.getRequestDispatcher("WEB-INF/pages/loader.jsp").forward( request, response); } } The jsp uses ajax to regularly post to the servlet and get the status. The thread just runs like 3 minutes, crawling some last.fm data.

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  • Using an empty column as a divider in a JTable.

    - by Catalina Island
    I'm trying to use an empty column as a divider between pairs of columns in a JTable. Here's a picture and code for what I have so far. I know I can change the look using a custom TableCellRenderer. Before I go down that road, is there a better way to do this? Any ideas appreciated. import javax.swing.*; import javax.swing.table.*; public class TablePanel extends JPanel { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { JFrame f = new JFrame("TablePanel"); f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); f.add(new TablePanel()); f.pack(); f.setVisible(true); } }); } public TablePanel() { TableModel dataModel = new MyModel(); JTable table = new JTable(dataModel); table.getColumnModel().getColumn(MyModel.DIVIDER).setMaxWidth(0); JScrollPane jsp = new JScrollPane(table); jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); this.add(jsp); } private static class MyModel extends AbstractTableModel { private static final int DIVIDER = 2; private final String[] names = { "A1", "A2", "", "B1", "B2" }; @Override public int getRowCount() { return 32; } @Override public int getColumnCount() { return names.length; } @Override public String getColumnName(int col) { if (col == DIVIDER) return ""; return names[col]; } @Override public Object getValueAt(int row, int col) { if (col == DIVIDER) return ""; return (row + 1) / 10.0; } @Override public Class<?> getColumnClass(int col) { if (col == DIVIDER) return String.class; return Number.class; } } }

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  • UTF-8 support in java application

    - by jacekn
    I'm having trouble with UTF-8. common.jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> typical.jsp <%@ include file="common.jsp" %> Page Head <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> Form <form id="screenObject" accept-charset="UTF-8" action="/SiteAdmin/articleHeaderEdit?articleId=15" method="post"> I enter non latin1 characters into a text field and click Save. Validator complains about another field and stops the submission. This never gets to the database, so database ability to handle UTF-8 is not in this picture. The page redisplays with appropriate error but the text that had been entered is all messed up. All non latin1 characters are converted to some gibberish. I'm using Spring 3 MVC, in case that matters... Attempts Adding this to my view resolver didn't help: <property name="contentType" value="text/html;charset=UTF-8" />

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  • Auto-create ManagedBean problem

    - by Debbech
    I need to instanciate a ManagedBean manually in jsp code. I used the following code : FacesContext context = FacesContext.getCurrentInstance(); ActorBean bean = (ActorBean) context.getApplication().createValueBinding("#{actorBean}").getValue(context); response.getWriter().print(bean.getChaine()); but I still get a NullPointerException ! :( Any suggestion please. This is the stacktracelog: 11 juin 2010 12:33:44 org.apache.catalina.core.StandardWrapperValve invoke GRAVE: "Servlet.service()" pour la servlet jsp a généré une exception java.lang.NullPointerException at org.apache.jsp.jspx.portal_jsp._jspService(portal_jsp.java:157) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Unknown Source)

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  • Servlets: forwarding to a resource in a different webapp

    - by skaffman
    I'm trying to construct a java web app along modular principles, with some common resources (JSPs, mainly) in one WAR, and some custom resources in another. This means JSPs scattered across different WARs. Now JavaEE frowns upon this sort of shenanigans, and wants you to put everything in one place. My current workaround to this is to have an Eclipse-triggered Ant script which copies the content of one WAR into the other, but this is not a pleasant solution (it's fragile and too IDE-dependent). Ideally, what I'd like to be able to do is for a servlet to forward to a JSP located in a different WAR to one in which it is itself deployed. This would allow greater freedom in how I assemble my WARs. However, the RequestDispatcher does not seem to support such things. Another possibility is to use <c:import>, which does allow resources to be imported from a different WAR (with some caveats). This would probably allow me to have a "hook" JSP in one WAR, which then drags in the required JSP from another. This is a bit clunky, though, and the fact that <c:import> permits it shows that the underlying servlet API does also. But how do I access that functionality via the RequestDispatcher in a servlet?

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  • displaying another html content in div on ajax success

    - by Manish
    gameLike.jsp <div class="gameLikeStatus"> <a href="likeit" class="likeitlink">likeit</a> </div> var dataString = 'elementId='+ '<s:property value="id"/>'+ '&elementType=' + 'games'; $(document).ready(function(){ $('a#likeitlink').bind('click',function(event){ event.preventDefault(); $.ajax({ type: "POST", url: "likeit", dataType: "text html", data: dataString, success: function() { $.post('isLiked',dataString, function(data) { alert(data);//1 $('#gameLikeStatus').html(data); }); } }); }); }); in second.jsp contains a link <a href="unlikeit" class="Unlikeitlink">likeit</a> Here I am liking the element and after like it should display <a href="unlikeit" class="Unlikeitlink">likeit</a> instead of <a href="likeit" class="likeitlink">likeit</a> at <div class="gameLikeStatus"></div> in gameLike.jsp, alert(data);//1 is showing <a href="unlikeit" class="Unlikeitlink">likeit</a> this data but $('#gameLikeStatus').html(data); showing nothing. How to resolve this?

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  • Adidas by Jeremy Scott is the famous ‘wings’

    - by WoolrichParka
    The higher on this design activities the United states banner layover all over the shoes with red lines on one remaining feet and Adidas by Jeremy Scott the famous 5 celebrity agreement in white-colored and red on the other feet.Out of the many couples of JS Pizza 2.0 silhouettes we’ve gotten a look at, one of the more latest and awesome couples features a glow-in-the-dark higher.One of those Adidas Wing Shoes comes with opera create and bone fragments along the shoelaces place.Expect these to fall this fall, along with more from this years’ selection.wufengfengmaple36

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  • LLBLGen Pro v3.1 released!

    - by FransBouma
    Yesterday we released LLBLGen Pro v3.1! Version 3.1 comes with new features and enhancements, which I'll describe briefly below. v3.1 is a free upgrade for v3.x licensees. What's new / changed? Designer Extensible Import system. An extensible import system has been added to the designer to import project data from external sources. Importers are plug-ins which import project meta-data (like entity definitions, mappings and relational model data) from an external source into the loaded project. In v3.1, an importer plug-in for importing project elements from existing LLBLGen Pro v3.x project files has been included. You can use this importer to create source projects from which you import parts of models to build your actual project with. Model-only relationships. In v3.1, relationships of the type 1:1, m:1 and 1:n can be marked as model-only. A model-only relationship isn't required to have a backing foreign key constraint in the relational model data. They're ideal for projects which have to work with relational databases where changes can't always be made or some relationships can't be added to (e.g. the ones which are important for the entity model, but are not allowed to be added to the relational model for some reason). Custom field ordering. Although fields in an entity definition don't really have an ordering, it can be important for some situations to have the entity fields in a given order, e.g. when you use compound primary keys. Field ordering can be defined using a pop-up dialog which can be opened through various ways, e.g. inside the project explorer, model view and entity editor. It can also be set automatically during refreshes based on new settings. Command line relational model data refresher tool, CliRefresher.exe. The command line refresh tool shipped with v2.6 is now available for v3.1 as well Navigation enhancements in various designer elements. It's now easier to find elements like entities, typed views etc. in the project explorer from editors, to navigate to related entities in the project explorer by right clicking a relationship, navigate to the super-type in the project explorer when right-clicking an entity and navigate to the sub-type in the project explorer when right-clicking a sub-type node in the project explorer. Minor visual enhancements / tweaks LLBLGen Pro Runtime Framework Entity creation is now up to 30% faster and takes 5% less memory. Creating an entity object has been optimized further by tweaks inside the framework to make instantiating an entity object up to 30% faster. It now also takes up to 5% less memory than in v3.0 Prefetch Path node merging is now up to 20-25% faster. Setting entity references required the creation of a new relationship object. As this relationship object is always used internally it could be cached (as it's used for syncing only). This increases performance by 20-25% in the merging functionality. Entity fetches are now up to 20% faster. A large number of tweaks have been applied to make entity fetches up to 20% faster than in v3.0. Full WCF RIA support. It's now possible to use your LLBLGen Pro runtime framework powered domain layer in a WCF RIA application using the VS.NET tools for WCF RIA services. WCF RIA services is a Microsoft technology for .NET 4 and typically used within silverlight applications. SQL Server DQE compatibility level is now per instance. (Usable in Adapter). It's now possible to set the compatibility level of the SQL Server Dynamic Query Engine (DQE) per instance of the DQE instead of the global setting it was before. The global setting is still available and is used as the default value for the compatibility level per-instance. You can use this to switch between CE Desktop and normal SQL Server compatibility per DataAccessAdapter instance. Support for COUNT_BIG aggregate function (SQL Server specific). The aggregate function COUNT_BIG has been added to the list of available aggregate functions to be used in the framework. Minor changes / tweaks I'm especially pleased with the import system, as that makes working with entity models a lot easier. The import system lets you import from another LLBLGen Pro v3 project any entity definition, mapping and / or meta-data like table definitions. This way you can build repository projects where you store model fragments, e.g. the building blocks for a customer-order system, a user credential model etc., any model you can think of. In most projects, you'll recognize that some parts of your new model look familiar. In these cases it would have been easier if you would have been able to import these parts from projects you had pre-created. With LLBLGen Pro v3.1 you can. For example, say you have an Oracle schema called CRM which contains the bread 'n' butter customer-order-product kind of model. You create an entity model from that schema and save it in a project file. Now you start working on another project for another customer and you have to use SQL Server. You also start using model-first development, so develop the entity model from scratch as there's no existing database. As this customer also requires some CRM like entity model, you import the entities from your saved Oracle project into this new SQL Server targeting project. Because you don't work with Oracle this time, you don't import the relational meta-data, just the entities, their relationships and possibly their inheritance hierarchies, if any. As they're now entities in your project you can change them a bit to match the new customer's requirements. This can save you a lot of time, because you can re-use pre-fab model fragments for new projects. In the example above there are no tables yet (as you work model first) so using the forward mapping capabilities of LLBLGen Pro v3 creates the tables, PK constraints, Unique Constraints and FK constraints for you. This way you can build a nice repository of model fragments which you can re-use in new projects.

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  • GLSL vertex shaders with movements vs vertex off the screen

    - by user827992
    If i have a vertex shader that manage some movements and variations about the position of some vertex in my OpenGL context, OpenGL is smart enough to just run this shader on only the vertex visible on the screen? This part of the OpenGL programmable pipeline is not clear to me because all the sources are not really really clear about this, they talk about fragments and pixels and I get that, but what about vertex shaders? If you need a reference i'm reading from this right now and this online book has a couple of examples about this.

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  • Easy Profiling Point Insertion

    - by Geertjan
    One really excellent feature of NetBeans IDE is its Profiler. What's especially cool is that you can analyze code fragments, that is, you can right-click in a Java file and then choose Profiling | Insert Profiling Point. When you do that, you're able to analyze code fragments, i.e., from one statement to another statement, e.g., how long a particular piece of code takes to execute: https://netbeans.org/kb/docs/java/profiler-profilingpoints.html However, right-clicking a Java file and then going all the way down a longish list of menu items, to find "Profiling", and then "Insert Profiling Point" is a lot less easy than right-clicking in the sidebar (known as the glyphgutter) and then setting a profiling point in exactly the same way as a breakpoint: That's much easier and more intuitive and makes it far more likely that I'll use the Profiler at all. Once profiling points have been set then, as always, another menu item is added for managing the profiling point: To achieve this, I added the following to the "layer.xml" file: <folder name="Editors"> <folder name="AnnotationTypes"> <file name="profiler.xml" url="profiler.xml"/> <folder name="ProfilerActions"> <file name="org-netbeans-modules-profiler-ppoints-ui-InsertProfilingPointAction.shadow"> <attr name="originalFile" stringvalue="Actions/Profile/org-netbeans-modules-profiler-ppoints-ui-InsertProfilingPointAction.instance"/> <attr name="position" intvalue="300"/> </file> </folder> </folder> </folder> Notice that a "profiler.xml" file is referred to in the above, in the same location as where the "layer.xml" file is found. Here is the content: <!DOCTYPE type PUBLIC '-//NetBeans//DTD annotation type 1.1//EN' 'http://www.netbeans.org/dtds/annotation-type-1_1.dtd'> <type name='editor-profiler' description_key='HINT_PROFILER' localizing_bundle='org.netbeans.eppi.Bundle' visible='true' type='line' actions='ProfilerActions' severity='ok' browseable='false'/> Only disadvantage is that this registers the profiling point insertion in the glyphgutter for all file types. But that's true for the debugger too, i.e., there's no MIME type specific glyphgutter, instead, it is shared by all MIME types. Little bit confusing that the profiler point insertion can now, in theory, be set for all MIME types, but that's also true for the debugger, even though it doesn't apply to all MIME types. That probably explains why the profiling point insertion can only be done, officially, from the right-click popup menu of Java files, i.e., the developers wanted to avoid confusion and make it available to Java files only. However, I think that, since I'm already aware that I can't set the Java debugger in an HTML file, I'm also aware that the Java profiler can't be set that way as well. If you find this useful too, you can download and install the NBM from here: http://plugins.netbeans.org/plugin/55002

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  • Google I/O 2012 - Multi-Versioning Android User Interfaces

    Google I/O 2012 - Multi-Versioning Android User Interfaces Bruno Oliveira, Adam Powell This session will show you how to build user interfaces that work consistently across Android versions, from Eclair to today. We'll cover topics including the Action Bar, Fragments, style, size qualifiers, app structure, and navigation. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1533 51 ratings Time: 48:22 More in Science & Technology

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  • XML DATATYPE (series 1)

    New to SQL Server 2005, is The XML data type, which lets you store XML documents and fragments in a SQL Server database. An XML fragment is an XML instance that is missing a single top-level element. You can create columns and variables of the XML type and store XML instances in them. Note that the stored representation of XML data type instances cannot exceed 2 GB.

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  • solr administration

    - by devrick0
    Does anyone have any notes for an sysadmin supporting solr? I'm looking for anything that might be useful for monitoring & metrics as well as troubleshooting. Some useful links I have found are: /solr/admin/stats.jsp and /solr/admin/analysis.jsp In the logs I have noticed, other than the query, "hits", "status" and "QTime" values. The documentation on what these mean is sparse at least based on the 100+ websites I have checked. QTime appears to be the query time response in milliseconds. Hits is some form of results but I'm not sure exactly what makes that up and I'm not sure about status. Typically I see status come back as "0" but I have seen other numbers such as "5", so my thoughts that it could be either HTTP status codes or a 0 or 1 (good or bad) methodology isn't accurate. All of the documentation I have come across is intended for developers. Any sysadmin-centric documentation would be a big help.

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  • Mapping tomcat apache worker

    - by metamorpheus
    I am running an Apache2 server connected with Tomcat5.5 Workers.properties workers.tomcat_home=/usr/share/tomcat5.5 workers.java_home=/usr/lib/jvm/java-6-sun ps=/ worker.list=worker1 worker.worker1.port=8009 worker.worker1.host=127.0.0.1 worker.worker1.type=ajp13 worker.worker1.lbfactor=1 The JkMount is defined as follows LoadModule jk_module /usr/lib/apache2/modules/mod_jk.so JkWorkersFile /etc/apache2/workers.properties JkLogFile /var/log/apache2/mod_jk.log JkLogLevel debug JkLogStampFormat "[%a %b %d %H:%M:%S %Y] " JkMount /jsp-examples worker1 JkMount /jsp-examples/* worker1 JkMount /servlets-examples worker1 JkMount /servlets-examples/* worker1 JkMount /tcontainer worker1 JkMount /tcontainer/* worker1 If i call 127.0.0.1/servlets-examples, i get the examples displayed and executed correctly. If i call [same server as above]/tcontainer, i get the following error: The requested resource (/tcontainer) is not available. (this is an error provided by tomcat5.5) How can i define where to get the sources? i have a configuration file in /usr/share/tomcat-5.5-webapps/tcontainer.xml: <Context path="/tcontainer" docBase="/var/www/web96/html/tcontainer" debug="0" privileged="true" allowLinking="true"> </Context> What did i forget to configure or what is wrong with my definitions? Thanks

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  • Tortoise SVN Error Validating Server Certificate

    - by theplatz
    I just updated the certificate on one of my sites due to the old one expiring. The new certificate verifies fine in Internet Explorer 9, Chrome, and Firefox 4 - but when trying to browse/check out the repository with TortoiseSVN, I get the following error: Error validating server certificate for https://xxx.xxx.com:443: Unknown certificate issuer. Fingerprint: 96:b3:fa:19:bd:4a:ec:c2:bc:19:33:b8:25:2a:0a:47:28:41:07:d0 Distinguished name: (c) 2009 Entrust, Inc., www.entrust.net/rpa is incorporated by reference, Entrust, Inc., US Do you want to proceed? Accept permanently | Accept once | Reject Clicking Accept permanently will work, but this is less than ideal. This problem seems to be related to TortoiseSVN and not the certificate, which checks out fine at http://sslinstallcheck.entrust.net/SIC/jsp/MainWebAddress.jsp and http://www.digicert.com/help/. Any ideas on what could be wrong?

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  • Ways to polling server status

    - by Yijinsei
    Hi guys, I create the same question is stackoverflow, but I was recommended to post my question here. So I apologies for those who saw this post twice. I am try to create a JSP page that will show all the status in a group of local servers. Currently I create a schedule class that will constantly poll to check the status of the server with 30 second interval, with 5 second delay to wait for each server reply, and provide the JSP page with the information. However I find this way to be not accurate as it will take some time before the information of the schedule class to be updated. Do you guys have a better way to check the status of several server within a local network?

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  • Tomcat with virtual hosts - 404

    - by Thardas
    I have a CentOS 5.2 server set up with Apache 2.2.3 and Tomcat 5.5.27. The server hosts multiple virtual hosts connected to multiple Tomcats. For instance we have one tomcat for development and testing and one tomcat for production. project.demo.us.com points to dev tomcat and project.us.com points to production tomcat. Here's the virtual host's configuration: <VirtualHost *:80> ServerName project.demo.us.com CustomLog logs/project.demo.us.com/access_log combined env=!VLOG ErrorLog logs/project.demo.us.com/error_log DocumentRoot /var/www/vhosts/project.demo.us.com <Directory /var/www/vhosts/project.demo.us.com> Allow from all AllowOverride All Options -Indexes FollowSymLinks </Directory> ########## ########## ########## JkMount /project/* online </VirtualHost> JkMount line defines that we use online worker and our workers.properties contains this: worker.list=..., online, ... worker.online.port=7703 worker.online.host=localhost worker.online.type=ajp13 worker.online.lbfactor=1 And tomcat's conf/server.xml contains: <Connector port="7703" enableLookups="false" redirectPort="8443" protocol="AJP/1.3" URIEncoding="UTF-8" maxThreads="80" minSpareThreads="10" maxSpareThreads="15"/> I'm not sure what redirectPort is but I tried to telnet to that port and there's no one answering, so it shouldn't matter? Tomcat's webapps directory contains project.war and the server automatically deployed it under project directory which contains index.jsp and hello.html. The latter is for static debugging purposes. Now when I try to access http://project.demo.us.com/project/index.jsp, I get Tomcat's HTTP Status 404 - The requested resource () is not available. The same thing happens to hello.html so it's not working with static content either. Apache's access_log contains: 88.112.152.31 - - [10/Aug/2009:12:15:14 +0300] "GET /demo/index.jsp HTTP/1.1" 404 952 "-" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2" I couldn't find any mention of the request in Tomcat's logs. If I shutdown this specific tomcat, I no longer get Tomcat's 404 but Apache's 503 Service Temporarily Unavailable, so I should be configuring the correct Tomcat. Is there something obvious that I'm missing? Is there any place where I could find out what path the Tomcat is using to look for requested files?

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  • How can I diagnose a "502 Bad Gateway" response from an Apache/Tomcat configuration?

    - by Structure
    I just finished up configuring a fairly default configuration of Tomcat. My Apache configuration was pre-existing and post-tomcat it still has no issues. I am using mod_jk to (if I am saying this correctly) interface between Apache and Tomcat and have my conf files setup for my workers, etc. I put my test file (Simply: http://tomcat.apache.org/tomcat-4.1-doc/appdev/sample/web/hello.jsp) into my tomcat/webapps/ directory and then call it via http://localhost/test/hello.jsp. From here Apache returns a "502 Bad Gateway" response. I confirmed this via the Apache logs, but beyond that I have no idea how to diagnose the issue. I assume the 502 is because Tomcat did not respond. I'd like to confirm if Tomcat received the request, but cannot locate the log file. At this point I had thought my installation was complete, so not sure where to go from here. Any input would be appreciated.

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  • IIS NLB Web Farm to front Single Tomcat Instance

    - by Brent Pabst
    I've got a single Tomcat 6 server that hosts a JSP app. We just spun up a new IIS 7.5 web farm to host our other internal apps. Currently the machine that hosts Tomcat is also running IIS 7 with the ISAPI filter loaded to provide front-end handling for the JSP app. I'd like to move the IIS portion to the web farm to consolidate our IIS presence and let the Tomcat server just serve and run Java and Tomcat. Has anyone done this, is it even possible while ensuring session state is properly maintained? I had it up and running using the IIS Tomcat Connector http://tomcatiis.riaforge.org/ but after a while the communication between the boxes slowed and pages would not load. In addition it seemed like some of our authentication tickets were timing out. Thanks for any ideas or reference material!

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  • solr administration

    - by devrick0
    Does anyone have any notes for an sysadmin supporting solr? I'm looking for anything that might be useful for monitoring & metrics as well as troubleshooting. Some useful links I have found are: /solr/admin/stats.jsp and /solr/admin/analysis.jsp In the logs I have noticed, other than the query, "hits", "status" and "QTime" values. The documentation on what these mean is sparse at least based on the 100+ websites I have checked. QTime appears to be the query time response in milliseconds. Hits is some form of results but I'm not sure exactly what makes that up and I'm not sure about status. Typically I see status come back as "0" but I have seen other numbers such as "5", so my thoughts that it could be either HTTP status codes or a 0 or 1 (good or bad) methodology isn't accurate. All of the documentation I have come across is intended for developers. Any sysadmin-centric documentation would be a big help.

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  • How does hadoop decide what its nodes hostnames are?

    - by Dan R
    Currently the urls generated by the jobtracker & namenode return either hostnames like bubbles.local or just bubbles. These end up not resolving unless the client machine has specified these in their /etc/hosts file. When I run the hostname command on these machines it returns a hostname complete with the domain (E.G bubbles.example.com) Running a small java test on these machines InetAddress addr = InetAddress.getLocalHost(); byte[] ipAddr = addr.getAddress(); String hostname = addr.getHostName(); System.out.println(hostname); Produces output just like the hostname command. Where else could hadoop be grabbing a hostname to use in its jobtracker / namenode UI? This is occurring in clusters with Hadoop 1.0.3 and 1.0.4-SNAPSHOT from early august. The machines are running CentOS release 5.8 (Final). The generated URLs I'm referring to are like this http://example:50075/browseDirectory.jsp?namenodeInfoPort=50070&dir=/ or http://example.local:50075/browseDirectory.jsp?namenodeInfoPort=50070&dir=/

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  • spring3.0 mvc problem(The requested resource is not Available)

    - by Daniel
    Hi, I am a newbie for Spring MVC 3.0 and trying to write a sample webapp to get the feels of it. I am able to get url to invoke my associated controller, but not able to foward the request from which to my jsp resource as indicated by the output on the browser: The requested resource (/Spring30HelloWorld/helloworldcontroller) is not available. A word of suggestion on fixing the issue would be appreciated!! Please refer below for my code set up. Thanks in advance! web.xml (location: /WebContent) <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>Spring30HelloWorld</display-name> <servlet> <servlet-name>A</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>A</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.htm</welcome-file> </welcome-file-list> </web-app> A-servlet.xml (location: /WebContent/WEB-INF/) <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.controller" /> </beans> HelloWorldController.java (location: /src/com/controller) package com.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.portlet.ModelAndView; @Controller public class HelloWorldController { @RequestMapping("/helloWorld" ) public ModelAndView sayHello() { System.out.println("hello!"); //return new ModelAndView("helloworld.jsp", "hello", "hello"); return new ModelAndView("helloworld.jsp"); } } helloworld.jsp (location: /WebContent/) <html> <head> <title>Hello World</title> </head> <body> <h1>Simple Spring 3.0 Web App</h1> <p></p> </body> </html>

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  • Error while deploying a web application in OSGI container using pax web

    - by RaulDM
    Hello I am trying to deploy a web application in a Felix container. I have all the required configuration done with my web app like the setting up of the manifest headers: Webapp-Context: Bundle-ClassPath: Bundle-Activator: Import-Package: Bundle-SymbolicName: etc The Pax bundles that I have dropped in the same container are: pax-web-service-0.6.0.jar pax-web-jsp-0.7.1.jar pax-web-extender-war-0.7.1.jar pax-logging-service-1.5.0.jar pax-logging-api-1.5.0.jar Though it had been written in the pax web site that pax-web-service is included in pax-war-extender, it seems without pax-web-service bundle, all other bundles become handicapped. I had removed the other pax bundles like pax-web-extender-whiteboard-0.7.1.jar pax-web-jetty-0.7.1.jar, as I have not seen any usefulness of those. The pax-web-jetty-0.7.1.jar even does not get start up. it has dependencies which it could not be able to resolve from any one of the bundle provided by PAX. My browser is displaying: HTTP ERROR 403 Problem accessing /adminmodule/. Reason: FORBIDDEN Powered by Jetty:// while the Console log says: [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - REQUEST /adminmodule/ on org.mortbay.jetty.HttpConnection@1e94001 [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.service.internal.model.ServerModel - Matching [/adminmodule/]... [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.service.internal.model.ServerModel - Path [/adminmodule/] matched to {pattern=/adminmodule/.*,model=ResourceModel{id=org.ops4j.pax.web.service.internal.model.ResourceModel-2,name=,urlPatterns=[/],alias=/,servlet=ResourceServlet{context=/adminmodule,alias=/,name=},initParams={},context=ContextModel{id=org.ops4j.pax.web.service.internal.model.ContextModel-1,name=adminmodule,httpContext=org.ops4j.pax.web.extender.war.internal.WebAppWebContainerContext@11710be,contextParams={webapp.context=adminmodule}}}} [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.service.internal.HttpServiceContext - Handling request for [/adminmodule/] using http context [org.ops4j.pax.web.extender.war.internal.WebAppWebContainerContext@11710be] [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - sessionManager=org.mortbay.jetty.servlet.HashSessionManager@19c6163 [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - session=null [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - servlet= [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - chain=org.ops4j.pax.web.service.internal.model.FilterModel-3- [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - servlet holder= [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - call filter org.ops4j.pax.web.service.internal.model.FilterModel-3 [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.service.internal.WelcomeFilesFilter - Apply welcome files filter... [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.service.internal.WelcomeFilesFilter - Servlet path: / [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.service.internal.WelcomeFilesFilter - Path info: null [5884890@qtp-16567002-0 - /adminmodule/] INFO org.ops4j.pax.web.service.internal.HttpServiceContext - getting resource: [/adminmodule.jsp] [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.extender.war.internal.WebAppWebContainerContext - Searching bundle [com.cisco.zaloni.gwt.admin [1]] for resource [/adminmodule.jsp], normalized to [adminmodule.jsp] [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.extender.war.internal.WebAppWebContainerContext - Resource not found [5884890@qtp-16567002-0 - /adminmodule/] INFO org.ops4j.pax.web.service.internal.HttpServiceContext - found resource: null [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - call servlet [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.extender.war.internal.WebAppWebContainerContext - Searching bundle [com.cisco.zaloni.gwt.admin [1]] for resource [/], normalized to [/] [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.ops4j.pax.web.extender.war.internal.WebAppWebContainerContext - Resource found as url [bundle://1.0:1/] [5884890@qtp-16567002-0 - /adminmodule/] DEBUG org.mortbay.jetty - RESPONSE /adminmodule/ 403 It is really frustrating. please help. as I am new to OSGI. Raul

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  • Which option do you like the most?

    - by spderosso
    I need to show a list of movies ordered by the date they were registered in the system and the amount of comments users have made about them. E.g: Title | Register Date | # of comments Gladiator | 02-01-2010 | 30 Matrix | 01-02-2010 | 20 It is a web application that follows MVC. So, I have the object "Movie", there is a MovieManager interface that is used for retrieving/persisting data to the database and a servlet RecentlyAddedMovies.java that forwards to a .jsp to render the list. I will explain my problem by showing an example of how I am doing another similar task: Showing top ranked movies. Regarding the MovieManager: /** * Returns a collection of the x best-ranked movies * @param x the amount of movies to return * @return A collection of movies * @throws SQLException */ public Collection<Movie> getTopX(int x) throws SQLException; The servlet: public class Top5 extends HttpServlet{ @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { MovieManager movManager = JDBCMovieManager.getInstance(); try { req.setAttribute("movies", movManager.getTopX(5)); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } req.getRequestDispatcher("listMovies.jsp").forward(req, resp); } } And the listMovies.jsp has is some place something like: <c:forEach var="movie" items="${movies}"> ... <c:out value="${movie.title}"/> ... </c:forEach> The difference between the top5 problem and the problem I am trying to solve is that with the top5 thing all the data I needed to show in the view where part of the "Movie" object, so the MovieManager simply returned a Collection of Movies. Now, the MovieManager must retrieve an ordered list of (Movie, # of comments). The Movie object has a collection of Comment associated but of course, it lacks an instance variable with the length of that collection. The following things came into my mind: a) Create a MovieView object or something like that, that is only used by the "View" and "Controller" layer of the MVC which is not part of the "Model" in the sense that is used only for easy retrieval and display of information. This MovieView object will have a title, registerDate and # of Comments so the thing would look something like this: /** * Returns a collection of the x most recently added movies * @param x the amount of movies to return * @return A collection of movies * @throws SQLException */ public Collection<Movie2> getXRecentlyAddedMovies(int x) throws SQLException; The .jsp: <c:forEach var="movie2" items="${movies2}"> ... <c:out value="${movie2.title}"/> <c:out value="${movie2.registerDate}"/> <c:out value="${movie2.noOfComments}"/> ... </c:forEach> b) Add to the Collection the movie has, empty Comments (there is no actual need to retrieve all the comment data from the database) so that the comment's collection.size() will show the number of comments that movie has. (This sounds horrible to me) c) Add to the "Movie" object an instance field noOfComments with the setter and getter that will help with this type of cases even if, looking only from the object point of view, it is a redundant field since it already has a Collection that is ".size()"able . d) Make the MovieManager retrieve some structure like a Map or a Collection of a two component array or something like that that will contain both a Movie object and the associated number of comments and with JSLT iterate over it and show it accordingly.

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