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• Out of Memory - web applications

  - by Walter White

  Hi all, I am trying to figure out why Jetty 6.1.22 is running out of memory on my laptop. I have 2 web applications running JBoss Seam, Hibernate (with EHCache), and separate Quartz scheduler instances. With little load, the server dies throwing OutOfMemory. What can I look for? Would you think that I am not properly closing handles for input streams or files? I tried profiling my application with Netbeans, but it works off and on. Usually, it ends up locking up even though it doesn't use that much CPU or memory. Walter

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• Java - Is this a bad design pattern?

  - by Walter White

  Hi all, In our application, I have seen code written like this: User.java (User entity) public class User { protected String firstName; protected String lastName; ... getters/setters (regular POJO) } UserSearchCommand { protected List<User> users; protected int currentPage; protected int sortColumnIndex; protected SortOder sortOrder; // the current user we're editing, if at all protected User user; public String getFirstName() {return(user.getFirstName());} public String getLastName() {return(user.getLastName());} } Now, from my experience, this pattern or anti-pattern looks bad to me. For one, we're mixing several concerns together. While they're all user-related, it deviates from typical POJO design. If we're going to go this route, then shouldn't we do this instead? UserSearchCommand { protected List<User> users; protected int currentPage; protected int sortColumnIndex; protected SortOder sortOrder; // the current user we're editing, if at all protected User user; public User getUser() {return(user);} } Simply return the user object, and then we can call whatever methods on it as we wish? Since this is quite different from typical bean development, JSR 303, bean validation doesn't work for this model and we have to write validators for every bean. Does anyone else see anything wrong with this design pattern or am I just being picky as a developer? Walter

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• Linq-to-sql orderby thenby

  - by Curtis White

  I'm using the following query syntax from table where where orderby orderby Where the first orderby is a date and second orderby is a date. I would assume this would work like orderby thenby but appears to be doing something else. 1 How can I do an orderby thenby using the above syntax without using extension syntax. (Got it) 2 And what does the orderby, orderby do?

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• Objective C -std=c99 usage

  - by Andy White

  Is there any reason why you shouldn't use the "-std=c99" flag for compiling Objective-C programs on Mac? The one feature in C99 that I really like is the ability to declare variables anywhere in code, rather than just at the top of methods, but does this flag causes any problems or create incompatibilities for iPhone or Cocoa apps?

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• Create Windows/Macintosh Projector from Flash Builder 4

  - by Jeremy White

  Am I able to publish a Windows/Macintosh projector from Flash Builder 4? I would like a solution that stays within the IDE, rather than having to open FlashPlayer.exe and export the EXE/App.

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• Java EE 6 - ordering Servlet Request Listeners

  - by Walter White

  Hi all, I finally updated to Java EE 6 (web profile) and would like to control the ordering of my servlet request listeners. I did that before through the XML ordering by listing the listeners in a particular order. Now, I have placed the @WebListener annotation on the classes which are listeners and am trying to figure out how to order the listeners such that they work properly. One must run before another one, otherwise, it won't have the information it needs and won't work. Also, it doesn't seem my listeners are actually being invoked even though they're marked with @WebListener. I am running embedded glassfish 3.0. Another question that is somewhat related - ServletRequestListeners in Java EE 6 by default are still synchronous meaning they're hit first, then servlet filters, right? ServletRequestListeners are not asynchronous where they merely get notified of an event without interrupting the execution? Walter

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• Java - Get a list of all Classes loaded in the JVM

  - by Walter White

  Hi all, I would like to get a list of all the classes loaded in the JVM at a particular point in time. The classes are in a particular package and are accessible via /WEB-INF/classes and not through a jar file in /WEB-INF/lib. How would I get a list of classes? Would I simply get the classpath, list all the files, then look for the names? Walter

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• Hibernate, EHCache, Read-Write cache, adding item to a list

  - by Walter White

  Hi all, I have an entity that has a collection in it. The collection is a OneToMany unidirectional relationship storing who viewed a particular file. The problem I am having is that after I load the entity and try to update the collection, I don't get any errors, but the collection is never updated: Entity: @OneToMany(cascade = CascadeType.PERSIST) @JoinTable protected List<User> users; File Servlet @In private EntityQuery<File> File_findById; ... File file = File_findById(fileId); file.getUsers().add(user); session.update(file); Even though I call session.update(file) and I see stuff in hibernate logs, I don't see anything in the database indicating that it was saved. Walter

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• Interface design pattern / Java / Seam

  - by Walter White

  Hi all, Is this possible somehow? @Name("geolocationService") public interface GeolocationService { @Query("SELECT g FROM Geolocation geolocation INNER JOIN geolocation.deployment deployment WHERE geolocation.ipStart <= INET_ATON(:ipAddress) AND deployment.active = TRUE") Geolocation findByIpAddress(@NamedParameter("ipAddress")final String ipAddress); } public GeolocationAction { @In private GeolocationService geolocationService; @RequestParameter("ipAddress") private String ipAddress; @Out private Geolocation geolocation; public void find() { geolocation = geolocationService.findByIpAddress(ipAddress); } } Is it possible to do this without implementing the interface? What is required to make that work? I want to maintain less and do more. If I can intercept invocations of the geolocationService then I am golden, how would I do that? I don't want it to ever be instantiated, so it will always be null (I don't want the @Name and @In annotations either then). Walter

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• Use jquery to create a multidimensional array

  - by Simon M White

  I'd like to use jquery and a multidemensional array to show a random quote plus the name of the individual who wrote it as a separate item. I'll then be able to use css to style them differently. The quote will change upon page refresh. So far i have this code which combines the quote and the name and person who wrote it: $(document).ready(function(){ var myQuotes = new Array(); myQuotes[0] = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec in tortor mauris. Peter Jones, Dragons Den"; myQuotes[1] = "Curabitur interdum, nibh et fringilla facilisis, lacus ipsum pulvinar mauris, eu facilisis justo arcu eget diam. Duis id sagittis elit. Theo Pathetis, Dragons Den"; myQuotes[2] = "Vivamus purus purus, tincidunt et porttitor et, euismod sit amet urna. Etiam sollicitudin eros nec metus pretium scelerisque. James Caan, Dragons Den"; var myRandom = Math.floor(Math.random()*myQuotes.length); $('.quote-holder blockquote span').html(myQuotes[myRandom]); }); any help would be greatly appreciated.

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• Timestamp as part of composite primary key?

  - by Curtis White

  I get this error when using linq-to-sql with timestamp as part of a composite primary key: "The primary key column of type 'Timestamp' cannot be generated by the server." I'm guessing this may be due to the fact timestamp is just a row version thus perhaps it must be created after the insert? Or...

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• Java - how to design your own type?

  - by Walter White

  Hi all, Is it possible to design your own Java Type, say an extensible enum? For instance, I have user roles that a certain module uses and then a sub-package provides additional roles. What would be involved on the JDK side of things? Walter

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• NUnit vs Visual Studio 2010's MSTest?

  - by David White

  I realise that there are many older questions addressing the general question of NUnit v MSTest for versions of Visual Studio up to 2008 (such as this one). Microsoft have a history of getting things right in their 3rd version. For MSTest, that is VS2010. Have they done so with MSTest? Would you use it in a new project in preference to NUnit? My specific concerns: speed running tests within CruiseControl.NET (either commandline or MSBuild task) code coverage reports from CC.NET can you run MSTest tests in debug mode (We use ReSharper, so test-runners are not an issue for us. We have used NUnit for the last few years. We do not have TFS.)

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• Url encode and routing?

  - by Curtis White

  I'm using custom routing in a web forms context. I have some titles (part of my custom route) that have say a question mark character. When I URL encode this text ("Question?") and then pass into my route, I get an HTTP ERROR CODE 400. Apparently, the URL encoded text is somehow confusing the routing manager. Can someone provide context and explanation for this? Beyond that, I'm thinking I don't need to URL encode these route data but merely strip out the problem characters. Are there any security risks to not using URL decode/encode? And what are the problem characters? A list would be useful. Thanks!

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• Maven Plugin - are plugins executable within plugins?

  - by Walter White

  Hi all, Is it possible to execute a plugin from a plugin? For instance, if I want to programmatically call another plugin from within a plugin, not via static XML. Is this possible, how would I do that? Thanks, Walter

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• Maven Plugins - how to require a license

  - by Walter White

  I would like to make my plugin require a license to run similar to the maven clover plugin. Is there some utility out there that I can generate licenses with that will also allow me to integrate that into the plugin? I need to do the following steps. Modify the existing plugin to validate the license file Generate the license file online and store the information for retrieval later. Thanks, Walter

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• Silverlight isolated storage: what identifies an "application"?

  - by Joe White

  The docs for Silverlight's IsolatedStorageFile.GetUserStoreForApplication just say that the isolated storage is specific to the "application", and that each different application will have its own storage independent of all other "applications" (but with one quota for the entire domain). That's great, but I haven't found anything yet that explains just what "application" is supposed to mean (either in the Silverlight docs or the regular .NET Framework docs). What information does Silverlight, in particular, use to decide that "this is application A" and "this is application B"? Does it just go off the URI to the .xap file, or what?

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• Managing Team Development with SSAS, TFS, & BIDS

  - by Kevin D. White

  I am currently a single BI developer over a corporate datawarehouse and cube. I use SQL Server 2008, SSAS, and SSIS as my basic toolkit. I use Visual Studio +BIDS and TFS for my IDE and source control. I am about to take on multiple projects with an offshore vendor and I am worried about managing change. My major concern is manging merges and changes between me and the offshore team. Merging and managing changes to SQL & XML for just one person is bad enough but with multiple developers it seems like a nightmare. Any thoughts on how best to structure development knowing that sometimes there is no way to avoid multiple individuals making changes to the same file?

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• recaptcha asp.net always returns invalid

  - by Curtis White

  The reCaptcha example for ASP.NET does not seem to work. I followed the instructions but it always returns false, "The verification words are incorrect.". The entries are good. I'm using localhost as the site but am not getting any public/private key errors which I did get when adding a bad key (as a test). I've seen this error reported a lot but no good answers. Some suggest to call the validate on the control before checking to see if it is valid but this did not work for me.

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• Javascript string to Date conversion - simple?

  - by Mark White

  Hi all, Yesterday I managed to solve this, then lost a day's work due to the death of a HD. Now I cannot remember what I did to fix it, but I know it can be done. Input: string date in the format 'm/d/yy', eg '12/25/10', or '4/1/10' (1st April) Output - Date object I'm working with date.js and date.format.js so have Date.fromString() and Date.format() avaiable. But trying multiple combinations is not giving me what I need. IF the date were 'mm/dd/yy' then it's simple. But I'm using jquery.datepicker.js which outputs in 'm/d/yy' and I don't want to change this much I know this conversion can be done. After a 22 hour day... I need help. Thanks. Mark...

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• Why is a file requested through https after it has already been fetched through http?

  - by Walter White

  Hi all, I am trying to understand Http/Https a little better and possibly what headers I'm sending clients. Does the client have to re-fetch the same file under Https when it has already been fetched under Http, or do I need to send special headers? Walter

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• Where is JBoss Seam most popular

  - by Walter White

  Hi all, I have been using JBoss Seam now for over a year and still haven't seen much acceptance here in the US. My metrics are, the number of jobs that indicate JBoss Seam and number of people talking about JBoss Seam (Java groups / JBoss Seam groups, etc.). Is JBoss Seam more popular outside the US? Walter

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• Seam - list all components

  - by Walter White

  Hi all, I would like to get a list of all the components so that I can further process them. Is this possible, if so, how can I do that? I don't believe I can observe all postCreate events since it is simply an exact match and not a regular expression. @Observer("org.jboss.seam.postCreate.") You can only observe those events and not * as it is put into a map where the key is a string. Any ideas? Walter

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• Should Development / Testing / QA / Staging environments be similar?

  - by Walter White

  Hi all, After much time and effort, we're finally using maven to manage our application lifecycle for development. We still unfortunately use ANT to build an EAR before deploying to Test / QA / Staging. My question is, while we made that leap forward, developers are still free to do as they please for testing their code. One issue that we have is half our team is using Tomcat to test on and the other half is using Jetty. I prefer Jetty slightly over Tomcat, but regardless we using WAS for all the other environments. My question is, should we develop on the same application server we're deploying to? We've had numerous bugs come up from these differences in environments. Tomcat, Jetty, and WAS are different under the hood. My opinion is that we all should develop on what we're deploying to production with so we don't have the problem of well, it worked fine on my machine. While I prefer Jetty, I just assume we all work on the same environment even if it means deploying to WAS which is slow and cumbersome. What are your team dynamics like? Our lead developers stepped down from the team and development has been a free for all since then. Walter

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• How to Create MySQL Query to Find Related Posts from Multiple Tables?

  - by Robert Samuel White

  This is a complicated situation (for me) that I'm hopeful someone on here can help me with. I've done plenty of searching for a solution and have not been able to locate one. This is essentially my situation... (I've trimmed it down because if someone can help me to create this query I can take it from there.) TABLE articles (article_id, article_title) TABLE articles_tags (row_id, article_id, tag_id) TABLE article_categories (row_id, article_id, category_id) All of the tables have article_id in common. I know what all of the tag_id and category_id rows are. What I want to do is return a list of all the articles that article_tags and article_categories MAY have in common, ordered by the number of common entries. For example: article1 - tags: tag1, tag2, tag3 - categories: cat1, cat2 article2 - tags: tag2 - categories: cat1, cat2 article3 - tags: tag1, tag3 - categories: cat1 So if my article had "tag1" and "cat1 and cat2" it should return the articles in this order: article1 (tag1, cat1 and cat2 in common) article3 (tag1, cat1 in common) article2 (cat1 in common) Any help would genuinely be appreciated! Thank you!

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