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• Tomcat application: Frequent OutOfMemory PermGen exception while image uploads

  - by rabbit

  Hi, I have a tomcat 6 application which I have set parameters of -Xms512m -Xmx1024m. I thought 1 GB of memory in a 4 GB RAM would be enough, but that is not the case. On application stop/start multiple times (from tomcat manager) and also on image uploads (sometimes) I run into the OutOfMemory PermGen space error and the site stops responding. Should I increase the memory still some more? Is there anything else that I can do to from the tomcat side so that it does not run into the PermGen space issue? Thanks in advance for pointers/tips etc.

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• How to use Boolean variable in c:if

  - by Patriks

  I am using this code in jsf <c:if test="#{sV.done.booleanValue()}"> <option value="#{sV.id}" selected="selected">#{sV.text}</option> </c:if> <c:if test="#{not sV.done.booleanValue()}"> <option value="#{sV.id}">#{sV.text}</option> </c:if> sv is my class containing data (pojo), done is an Boolean variable, I want to display option tag with selected attribute if sV.done is true. But I couldn't make it. Don't know where I am wrong. Otherwise there can be something worong with c? because c:forEach was not working before some time in my case in same page. it can be the reason? Where I am wrong?

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• gwt - Using List<Serializable> in a RPC call?

  - by Garagos

  I have a RPC service with the following method: public List<Serializable> myMethod(TransactionCall call) {...} But I get a warning when this method is analyzed, and then the rpc call fails Analyzing 'my.project.package.myService' for serializable types Analyzing methods: public abstract java.util.List<java.io.Serializable> myMethod(my.project.package.TransactionCall call) Return type: java.util.List<java.io.Serializable> [...] java.io.Serializable Verifying instantiability (!) Checking all subtypes of Object wich qualify for serialization It seems I can't use Serializable for my List... I could use my own interface instead (something like AsyncDataInterface, wich implements the Serializable interface) but the fact is that my method will return a list custom objects AND basic objects (such as Strings, int....). So my questions are: Is it a standart behaviour? (I can't figure out why I can't use this interface in that case) Does anyone have a workaround for that kind of situation?

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• Movable Type: Specify one category to display in entry

  - by kohei

  Hi I want to specify one <CategoryLabel> in <MTEntryCategories> in archive template. For example my categories are like this (x is selected category in entry): Fruit --Apple --Grape Drinks --Coffee -x-Beer --Juice Vacation --France -x-UK In this case I want to display the label under "Drinks" in a entry (sample code) <MTSubCategories category="Drinks"> <MTEntryCategories> <h1><$MTcategory_label$><h1> </MTEntryCategories> </MTSubCategories> I know there are various plugin that do this but I couldn't find one that supports MT5. If anyone know if there is a way to do this without the plugins, greatly appreciated!

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• When to use Hibernate?

  - by Ramo

  Hi All, I was asked in an interview this question so I answered with the following: -Better Performance: - Efficient queries. - 1st and 2nd level caching. - Good caching gives better scalability. - Good Database Portability: - Changing the DB is as easy as changing the dialect configuration. - Increased Developer Productivity: - Think only in object terms not in query language terms. But I also feel that systems fall in one of the below categories, and Hibernate may not be suited for all these cases, I'm interested in your thoughts about this, do you agree with me? please let me know when would use HB in the following case and why. Write Only Systems: Read Only Systems: Write Mostly Systems: Read Mostly Systems: Regards Ramo

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• Why is new showat attribute required when using code generation?

  - by Patrick Karcher

  When I generate code using T4 templates in Visual Studio 2010, I get the following error for each of my asp controls when I try to compile: Control "ddState" is missing required attribute "showat". I have never gotten this error in previous versions of .NET. Further, I don't get this error when I manually construct my pages either by dragging/dropping, nor do I get it when I type out the control text myself. When I generate code, I have to manually add showat="client" to my tag for the compiler to be happy. It was my understanding that I never had to explicitly specify this tag. The following: <asp:dropdownlist id="ddState" runat="server" showat="client" /> solves the problem. Why do I have to add this to generated code but not other times? (It's a VS-2010 webforms project, using VB, in case that makes a difference.)

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• How can I enable auto-updates in a Qt cross-platform app?

  - by FX

  I love applications that are able to update themselves without any effort from the user (think: Sparkle framework for Mac). Is there any code/library I can leverage to do this in a Qt app, without having to worry about the OS details? At least for Windows/Mac/user-owned-linux-binaries. I could integrate Sparkle on the Mac version, code something for the linux case (only for a standalone, user-owned binary; I won't mess with distros packaging, if my program is ever packaged), and find someone to help me on the Windows side, but that's horribly painful. Surely I'm not the only one who wants to provide this to users?

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• designing database tables using JDBC

  - by Noona

  I am creating a users table using JDBC and mysql, each user has a permissions list that comprises Integer values, I am wondering if I should use an array for storing these values and then have only 1 record for this user in the table, or simply create a new table that comprises 2 columns: user ID and permissions, and then have multiple records for each user that specify the user name in one columns and one permission value in the second column, the second option seems to be redundant since a permission value is a simple object that isn't associated with any other objects (like a student and courses list for example, because the course is associated with many other objects, like grade, teacher, etc, so in this case it is natural to have multiple records), but the first one seems to be a bit unnatural to me, so if someone has experience with these things and direct me? thanks

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• Another Permutation Word Conundrum... With Linq?

  - by CraigF

  I have seen many examples of getting all permutations of a given set of letters. Recursion seems to work well to get all possible combinations of a set of letters (though it doesn't seem to take into account if 2 of the letters are the same). What I would like to figure out is, could you use linq (or not) to get all possible combinations of letters down to 3 letter combinations. For example, given the letters: P I G G Y I want an array of all possible cominations of these letters so I can check against a word list (scrabble?) and eventually get a list of all possible words that you can make using those letters (from 3 letters up to the total, in this case 5 letters).

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• How do I access the ASP.NET Configuration Tool when a site is live? This is ASP.NET MVC.

  - by Mike Marks

  I was wondering if it's possible to access the ASP.NET Configuration Tool once a site is live. To be able to create and edit users and roles is obviously very important, and from what I've been reading, once a site is deployed, the Configuration Tool is no longer accessible. If this is the case, HOW do I add users, etc.? By the way, I found a User Management plugin which brings a lot of the Configuration Tool's capabilities to the front end of a User Management section of the deployed website, but it DOES NOT offer the capability to add a new user. Help??? Thanks!!

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• How do I get the WinForm Designer to totally ignore a property on a custom control?

  - by Ian Ringrose

  This must be a FAQ, but I can’t find a duplicate question! There are lot of different attributes that control what the WinForm Designer does with properties on a custom control, I am never clear on the one I should use in this case. I am looking for: Designer does not show property in grid Designer does not read value of property Designer does not set property to default value E.g. Designer behaves as if the property was not there. Designer does not complain if it has already done one of the above before the attributes were added (hard!) Background. The code that is giving me the problem is: this.eventListControl.FilterSets = ((SystList<FilterSet>)(resources.GetObject("eventListControl.FilterSets"))); The FilterSets property should never have been touched by the winforms designer; it is now not Serializable and MsDev falls over every time a form that used the eventListControl is changed!

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• Why are my margins still collapsing?

  - by Brandon Dorsey

  My code in this "Fiddle" shows that I have adjacent elements which vertical margins are collapsing on one another. I understand that due to the nature of vertical margins in css, the largest of the two is chosen, In my case the p tag. What I am having trouble with is trying to break the margins by using a 1px border or 1px padding. I've seen it work with other workarounds such as position:absolute or float method. I am not understanding why using 1px border or padding is not working properly to give me 15px of space.

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• make a lazy var in scala

  - by ayvango

  Scala does not permit to create laze vars, only lazy vals. It make sense. But I've bumped on use case, where I'd like to have similar capability. I need a lazy variable holder. It may be assigned a value that should be calculated by time-consuming algorithm. But it may be later reassigned to another value and I'd like not to call first value calculation at all. Example assuming there is some magic var definition lazy var value : Int = _ val calc1 : () => Int = ... // some calculation val calc2 : () => Int = ... // other calculation value = calc1 value = calc2 val result : Int = value + 1 This piece of code should only call calc2(), not calc1 I have an idea how I can write this container with implicit conversions and and special container class. I'm curios if is there any embedded scala feature that doesn't require me write unnecessary code

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• onbeforeunload dilemma: iframe breaking vs. annoying message on refresh/back buttons click

  - by Tossapol

  I'm implementing a search service called SearchInsideOut. http://bit.ly/97SFyW This search service simply replaces web page results by full web pages (Yes, I used iframe). The problem I have to deal with is iframe-breaking pages. The promising solution I found is using onbeforeunload to let users decide whether to stay or leave my site. But this also creates another annoying behavior. When users click other links in my site, onbeforeunload will also be triggered. Fortunately, I could solve this case by placing window.onbeforeunload=null in the onclick event of those links of my site. Unfortunately, I have no idea how to detect external events like clicking "refresh/back" buttons. What should I do to solve this difficulty? All suggestions and comments are highly appreciated.

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• SQL select statement - returning records starting with variable length string

  - by alpheus

  I am using an alphabetical sorting feature and need a SQL statement to return records beginning with a variable length string. However, records also need to be returned if there are periods, spaces, or dashes between any of the characters in the string. For example, the string could be "M" (easy). Or "MA" (in which case it needs to return records starting with "MA", "M.A", "M A", and "M-A"). Or "MAA", and so on. This is the statement I have so far: "SELECT * from table where LEFT(name," + value.Length + ")='" + value + "'" But I can't work out how to get it to return results where there are periods, spaces or dashes in name. Any help constructing the statement would be great.

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• how to extract data from excel (apache poi) to put it in mysql table using jsp? [ SOLVED]

  - by Nihad KH

  I want to extract data from excel sheet to insert it into a mysql table using jsp, so far i've done this and its printing data into the outpout(using apache poi),what should i add to this code ? Output : Name Age Adress Mark 35 New york,AA Elise 22 India,bb Charlotte 45 France,cc Readexcel.jsp : <%@page import="java.sql.Statement"%> <%@page import="java.util.ArrayList"%> <%@page import="java.sql.PreparedStatement"%> <%@page import="java.sql.Connection"%> <%@page import="java.util.Date"%> <%@page import="org.apache.poi.ss.usermodel.Cell"%> <%@page import="org.apache.poi.ss.usermodel.Row"%> <%@page import="org.apache.poi.xssf.usermodel.XSSFSheet"%> <%@page import="org.apache.poi.xssf.usermodel.XSSFWorkbook"%> <%@page import="java.io.File"%> <%@page import="org.apache.commons.io.FilenameUtils"%> <%@page import="org.apache.commons.fileupload.FileItem"%> <%@page import="java.util.Iterator"%> <%@page import="java.util.List"%> <%@page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%> <%@page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%> <%@page import="org.apache.commons.fileupload.FileItemFactory"%> <%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>PRINT DATA FROM EXCEL FILE</title> </head> <body> <% try{ boolean ismultipart=ServletFileUpload.isMultipartContent(request); if(!ismultipart){ }else{ FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); List items = null; try{ items = upload.parseRequest(request); }catch(Exception e){ } Iterator itr = items.iterator(); while(itr.hasNext()){ FileItem item = (FileItem)itr.next(); if(item.isFormField()){ }else{ String itemname = item.getName(); if((itemname==null || itemname.equals(""))){ continue; } String filename = FilenameUtils.getName(itemname); File f = checkExist(filename); item.write(f); try{ XSSFWorkbook workbook = new XSSFWorkbook(item.getInputStream()); XSSFSheet sheet = workbook.getSheetAt(0); Iterator<Row> rowIterator = sheet.iterator(); while (rowIterator.hasNext()){ Row row = rowIterator.next(); Iterator<Cell> cellIterator = row.cellIterator(); while (cellIterator.hasNext()) { Cell cell = cellIterator.next(); switch (cell.getCellType()){ case Cell.CELL_TYPE_NUMERIC: out.print(cell.getNumericCellValue() + "t"); break; case Cell.CELL_TYPE_STRING: out.print(cell.getStringCellValue() + "t"); break;} } out.println(""); } }catch (Exception e){ e.printStackTrace(); } } } } }catch(Exception e){ } finally { out.close(); } %> <%! private File checkExist(String fileName){ String saveFile = "D:/upload/"; File f = new File(saveFile+"/"+fileName); if(f.exists()){ StringBuffer sb = new StringBuffer(fileName); sb.insert(sb.lastIndexOf("."),"-"+new Date().getTime()); f = new File(saveFile+"/"+sb.toString()); } return f; } %> </body> </html> I've created a table in my database named EXCELDATA with the header of the excel sheet : ExcelData (Name varchar(50),age int,adress varchar(50)); what should i add to this code to get the data from the excel sheet to the mysql table ??

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• How do I (or should I?) access the service layer from a SiteMesh template (views/layouts/main.gsp) in Grails?

  - by knorv

  I need to create a toplist in the page footer on a site that I'm building. The footer is created in the default SiteMesh layout template (views/layouts/main.gsp). In order to create the toplist access to the database is needed, so I've encapsulated all logic needed for the toplist creation in a service class (services/FooService). Please note that while services are usually accessed from the controller layer, in this case the default layout template (views/layouts/main.gsp) is not generated from a controller. Can the layout view (views/layouts/main.gsp) access a service class? How? Is this the correct design decision? If not, what is a better encapsulation and how do I interact with said encapsulation from the layout view (views/layouts/main.gsp)?

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• Having a fork match the original repo when the original master branch can't be merged in?

  - by a2h

  The related questions that SO offer me only answer simple cases that can be solved with a pull - however, that won't work for my case. There's a repository I've forked, with just a master branch, and I've forked it, and I've worked in both my master, and a new branch of my own, rw-style. The owner of the forked repository's committed some of my changes but not others; the black dots on the top right below represent commits from both my master and rw-style branches. I'm aware using the fork queue is not a good idea, so I'm staying away from it. Using git pull does work, but it creates a conflict that I would then need to resolve, and it also results in duplicate history for my master branch, and that doesn't look particularly pretty. I don't know any other solutions right now, so I'm currently considering just creating a patch from two commits that I haven't yet pushed, deleting my fork, creating it again from the original, and then applying my patches on top of it. Is that the only solution?

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• update each recordset with datareader

  - by knittl

  hi, my situation is the following: i have a datareader and loop over all records returned by a select statement and then call a function with a value from that row. but now i need to update a column in each row, after the function has been called. using a separate update statement seems like a huge overkill. what's the best method to do so? i've heard about dataadapters and datasets—but the only thing i know is that they exist, not how to use them (properly) in this case. platform is c# with sql server

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• comparing multidimensional array

  - by John K

  Hello everyone, I have the following array: Array ( [0] => Array ( [0] => 87 [1] => 55 [2] => 85 [3] => 86 ) [1] => Array ( [0] => 58 [1] => 84 ) [2] => Array ( [0] => 58 ) ) This array above is an example. The actual array is of variable size, but structured like this. Basically, I'd like to run array_intersect on each second level array and grab the value (number) that is common between them. In this case, it would be 58. I'm not quite sure where to start on this. Any advice?

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• Code Golf: Ghost Leg

  - by Anax

  The challenge The shortest code by character count that will output the numeric solution, given a number and a valid string pattern, using the Ghost Leg method. Examples Input: 3, "| | | | | | | | |-| |=| | | | | |-| | |-| |=| | | |-| |-| | |-|" Output: 2 Input: 2, "| | |=| | |-| |-| | | |-| | |" Output: 1 Clarifications Do not bother with input. Consider the values as given somewhere else. Both input values are valid: the column number corresponds to an existing column and the pattern only contains the symbols |, -, = (and [space], [LF]). Also, two adjacent columns cannot both contain dashes (in the same line). The dimensions of the pattern are unknown (min 1x1). Clarifications #2 There are two invalid patterns: |-|-| and |=|=| which create ambiguity. The given input string will never contain those. The input variables are the same for all; a numeric value and a string representing the pattern. Entrants must produce a function. Test case Given pattern: "|-| |=|-|=|LF| |-| | |-|LF|=| |-| | |LF| | |-|=|-|" |-| |=|-|=| | |-| | |-| |=| |-| | | | | |-|=|-| Given value : Expected result 1 : 6 2 : 1 3 : 3 4 : 6 5 : 5 6 : 2

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• How to render Max(Substring) with Lambda Extensions

  - by caifa

  Hi everybody. I'm using NHibernate with Lambda Extensions. I'd like to know how to nest a Max function with a Substring. The following statement retrieves Max("invoice_id") var ret = session .CreateCriteria<Invoice>() .SetProjection(Projections.Max("invoice_id")) .UniqueResult(); but in my case the field invoice_id is made in this way: 12345.10 where 12345 is the invoice number, and 10 refers to the current year (2010). So I need to calculate the Max function only over the first 5 digits. How can I do it?

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• How to display how many times each records in a table used by other table

  - by Fredy

  I have a problem with my query, below are two tables that tbl_tag and tbl_tag_usedby. I want to show how much of each record in tbl_tag used by record in tbl_tag_usedby. Here is a query that I use: SELECT t.*, COUNT(u.tagid) AS totale FROM tbl_tag t LEFT JOIN tbl_tag_usedby u ON u.tagid = t.id AND t.status =1 GROUP BY u.tagid and the results are as below: In this case the record id from 2 to 6 do not appear in the query results, I want record id from 2 to 6 are also shown and on the field "totale" its value is 0. Can anyone help me?

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• d3 tree - parents having same children

  - by Larry Anderson

  I've been transitioning my code from JIT to D3, and working with the tree layout. I've replicated http://mbostock.github.com/d3/talk/20111018/tree.html with my tree data, but I wanted to do a little more. In my case I will need to create child nodes that merge back to form a parent at a lower level, which I realize is more of a directed graph structure, but would like the tree to accomodate (i.e. notice that common id's between child nodes should merge). So basically a tree that divides like normal on the way from parents to children, but then also has the ability to bring those children nodes together to be parents (sort of an incestual relationship or something :)). Asks something similar - How to layout a non-tree hierarchy with D3 It sounds like I might be able to use hierarchical edge bundling in conjunction with the tree hierarchy layout, but I haven't seen that done. I might be a little off with that though.

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• Command line tool (PDF Workflow) in OSX that detects if key is down

  - by kroko

  Hello! I'm writing a OSX PDF Workflow in ObjC and C. A single executable ("UNIX Tool" as named in the Apple reference), that reads in the spooled PDF file, does some parsing. I'd like to give more functionality by enabling a key-down event handling, meaning - when user opens print dialog in an application - and chooses to left-mouse-click on the custom made pdf workflow to run it - depending on if a keyboard key is down (i.e. option key, but "any key down" would be enough for me) when running that workflow - a decision is made in the code. I have read NSEvent and Carbon Event Manager reference and it seems that in this case (a plain unix executable + not run as root) it's not possible. Or is it? Many thanks in advance, Kroko

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