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  • How to detect open database connection with Hibernate / JPA?

    - by John K
    I am learning JPA w/Hibernate using a Java SE 6 project. I'd simply like to be able to detect if the connection between Hibernate and my database (MS SQL Server) is open. For example, I'd like to be able to detect this, log it, and try reconnecting again in 60 seconds. This is what I thought would work but isOpen() doesn't appear to be what I want (always is true): EntityManagerFactory emf = Persistence.createEntityManagerFactory("rcc", props); if (emf != null && emf.isOpen()) { EntityManager em = emf.createEntityManager(); if (em == null || !emf.isOpen()) // error connecting to database else ... This seems to me to be a simple problem, but I cannot find an answer!

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  • How can you prevent an individual window being captured by Print-Screen?

    - by John
    I noticed a few times than when I print-screen while Media Player is running, the content is replaced with a grey rectangle. I've no idea if it's deliberate due to DRM, or some technical issue, but it struck me that being able to deliberately block screen-capture might be a useful feature in some scenarios. I am not looking to fix the problem, but replicate it! Is there some specific message each HWND gets for print-screen - does Windows do a special repaint or simply dump buffers to the clipboard? I guess I'd prefer to focus this on Win32 specifically, but as long as it's Windows-related then fine.

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  • How to register XHTML namespaces??

    - by John Tyler
    My page use to validate for XHTML but I added the addthis buttons to page and it gives a new namespace: E.G.: <a addthis:url="http://domain.tld/path/to/stuff" addthis:title="Teh Title here"> I tried: <html xmlns="http://www.w3.org/1999/xhtml" xmlns:addthis="http://addthis.com/" lang="en"> Doesn't work. Can we register namespaces for the validator??? I AM EMOTIONALLY ATTACHED TO VALID XHTML. I like addthis, I think its the best button of its kind (yes, I need to use the namespace properties, I know you dont have to but I do for what im doing PHP project) :(

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  • Using Unix Process Controll Methods in Ruby

    - by John F. Miller
    Ryan Tomayko touched off quite a fire storm with this post about using Unix process control commands. We should be doing more of this. A lot more of this. I'm talking about fork(2), execve(2), pipe(2), socketpair(2), select(2), kill(2), sigaction(2), and so on and so forth. These are our friends. They want so badly just to help us. I have a bit of code (a delayed_job clone for DataMapper that I think would fit right in with this, but I'm not clear on how to take advantage of the listed commands. Any Ideas on how to improve this code? def start say "*** Starting job worker #{@name}" t = Thread.new do loop do delay = Update.work_off(self) break if $exit sleep delay break if $exit end clear_locks end trap('TERM') { terminate_with t } trap('INT') { terminate_with t } trap('USR1') do say "Wakeup Signal Caught" t.run end end

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  • Git ignore file for vb.net projects

    - by John C
    Placing a vb.net project under git control in windows (was previously under VSS - long sad story of repository corruption, etc). How should I set up the ignore file? The exclusions I'm thinking of using are: *.exe *.pdb *.manifest *.xml *.log (is git case sensitive on windows? Should I exclude *.Log as well?) *.scc (I gather these were left over from VSS - maybe I should delete them?) Is this a sensible list? Should I be excluding directories?

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  • Help decoupling Crystal Report from CrystalReportViewer

    - by John at CashCommons
    I'm using Visual Studio 2005 with VB.NET. I have a number of Crystal Reports, each with their own associated dialog resource containing a CrystalReportViewer. The class definitions look like this: Imports System.Windows.Forms Imports CrystalDecisions.CrystalReports.Engine Imports CrystalDecisions.Shared Public Class dlgForMyReport Private theReport As New myCrystalReport Public theItems As New List(Of MyItem) Private Sub OK_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK_Button.Click Me.DialogResult = System.Windows.Forms.DialogResult.OK Me.Close() End Sub Private Sub Cancel_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Cancel_Button.Click Me.DialogResult = System.Windows.Forms.DialogResult.Cancel Me.Close() End Sub Private Sub dlgForMyReport_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load theReport.SetDataSource(theItems) 'Do a bunch of stuff here to set data items in theReport Me.myCrystalReportViewer.ReportSource = theReport End Sub End Class I basically instantiate the dialog, set theItems to the list I want, and call ShowDialog. I now have a need to combine several of these reports into one report (possibly like this) but the code that loads up the fields in the report is in the dialog. How would I go about decoupling the report initialization from the dialog? Thanks!

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  • Proxy calls across a DMZ

    - by John
    We need to determine a quick way for our web application deployed in a DMZ to communicate to our SQL server that lives in the protected network. Only port 80 is open and available, and no direct SQL traffic is allowed across the firewall. So take the following simple system. A web page (default.aspx) makes a call (string GetData()) that resides in an assembly (Simple.DLL). GetData() uses ADO.NET to open a connection, execute a SQL call, retrieve the data, and return the data to the caller. However, since only port 80 is available and no SQL traffic is allowed, what could we do to accomplish our goal? I believe a .NET remoting solution would work, and I have heard of an architecture where a remoting layer proxies the call from Simple.DLL in the DMZ to another Simple.DLL that runs on the protected side. The remoting layer handles the communication between the two DLL’s. Can someone shed some light on how WCF/remoting can help us and how to get started with a solution?

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  • firefox displaying .swf with wrong dimensions

    - by John Leonard
    I can't figure this one out. I have a flex app with fixed dimensions (950 x 700). I'm compiling the swf and using the default wrapper that flex generates. in some instances of Firefox, the dimensions are wrong. On top of that, with different domains, I get the .swf rendered with different dimensions (both wrong). Firefox 3.6.3 on one computer works fine. On another, the dimensions are off. Swf example and if you don't see a clipped swf...here are the screenshots. Rendered incorrectly on one domain And rendered in another domain with different bad dimensions. I'm at a total loss. When I embed the .swf with swfobject, I get the same issue. In the example you see, there's nothing in the app except for a single label centered on the stage.

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  • Jena result in UTF-8 format

    - by john
    How can I get in Jena (Java language) result in UTF-8 format? My code: Query query= QueryFactory.create(queryString); QueryExecution qexec= QueryExecutionFactory.sparqlService("http://lod.openlinksw.com/sparql", queryString); ResultSet results = qexec.execSelect(); List<QuerySolution> list = ResultSetFormatter.toList(results); System.out.println(list.get(i).get("churchname"));

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  • Getting the .NET Class associated with a process

    - by John P. Grieb
    As part of a WMI Coupled provider that I'm creating I need to write an instance enumerator. The code I have is below. What I need to do is get the Class instance associated with the process. Any ideas? static public WMIProviderSample GetInstance([ManagementName("ID")] int processId) { try { Process[] processes = Process.GetProcessesByName("WMI Provider Sample"); foreach (Process process in processes) { if (process.Id == processId) { // Need to convert the process to an instance of WMIProviderSampel } } return null; } catch (ArgumentException) { return null; } }

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  • How to decode a html string using xslt

    - by John ClearZ
    I am trying to style an rss feed using xslt. I want to display an image that is stored in the tag on the feed. The problem is it is encoded to display as text on the page instead of being rendered. The following is an example of part of the string. 1). <description>&lt;img src="http&amp;#58;&amp;#47;&amp;#47;buavhw.blu.livefilestore.com&amp;#47;y1ppCokLxFJSG2cmyPdvg... I had to add extra coding to the string above to get it to appear properly here. The string below is how it appears when I paste it directly into the text box. 2). <description><img src="http&#58;&#47;&#47;buavhw.blu.livefilestore.com&#47;y1ppCokLxFJSG2cmyPdvg... If I copy and paste it again from the preview window it only then becomes the following string. 3). <description><img src="http://buavhw.blu.livefilestore.com/y1ppCokLxFJSG2cmyPdvg...

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  • Does Delphi really handle dynamic classes better than static?

    - by John
    Hello, I was told more than once that Delphi handles dynamic classes better than static.Thereby using the following: type Tsomeclass=class(TObject) private procedure proc1; public someint:integer; procedure proc2; end; var someclass:TSomeclass; implementation ... initialization someclass:=TSomeclass.Create; finalization someclass.Free; rather than type Tsomeclass=class private class procedure proc1; public var someint:integer; class procedure proc2; end; 90% of the classes in the project I'm working on have and need only one instance.Do I really have to use the first way for using those classes? Is it better optimized,handled by Delphi? Sorry,I have no arguments to backup this hypothesis,but I want an expert's opinion. Thanks in advance!

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  • Doxygen: grouping documentation by folder in a multi-project codebase

    - by John
    In one project, some pages were added - it was a new project in which doxygen was being tested properly - adding comments & pages - rather than simply auto-generating docs from our existing code-base. The problem is when doxygen is run on the main code-base, that project's pages show up at a top level. e.g they have a main-page and some sub-pages. But what we'd want is all those pages pushed down one level so you have main-project-main-project-pages. One question is what happens if multiple projects have a main-page? Do they get combined, or throw errors? Another question is if you can tell doxygen to use paths and containing folders to auto-generate groups or sections or page-hierarchies in some way? Going through all out projects to properly assign classes to groups is a mammoth task, so ideally everything in a directory would get put in a group of that name, as a way to make the documentation of non-doxygen codebases better. Sorry my question is a bit vague, the problem is even after reading the docs the terminology isn't totally clear yet. Hopefully the kind of question I'm asking is clear, if not I'll try to cobble an example file-structure together.

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  • Writing a simple RSpec test to check that Rake tasks are correct

    - by John Feminella
    I'm trying to be diligent about checking my rake tasks with RSpec tests, but in the process of feeling my way around I seem to have hit a wall. I've got a really simple RSpec test that looks like this: # ./test/meta_spec.rb describe "Rake tasks" do require 'rake' before(:each) do @rake = Rake::Application.new @rake.load_rakefile # => Error here! Rake.application = @rake end after(:each) do Rake.application = nil end it "should have at least one RSpec test to execute" do Rake.application["specs"].spec_files.size.should > 0 end end I have a simple task called "specs" defined in ./Rakefile.rb which has an RSpec task that includes all the *_spec.rb files. If I put the @rake.load_rakefile method in, I want that Rakefile to load. But instead it just bombs out. If I comment it out, however, the test fails because the "specs" task is (understandably) not defined. Where am I going wrong?

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  • Unescape _xHHHH_ XML escape sequences using Python

    - by John Machin
    I'm using Python 2.x [not negotiable] to read XML documents [created by others] that allow the content of many elements to contain characters that are not valid XML characters by escaping them using the _xHHHH_ convention e.g. ASCII BEL aka U+0007 is represented by the 7-character sequence u"_x0007_". Neither the functionality that allows representation of any old character in the document nor the manner of escaping is negotiable. I'm parsing the documents using cElementTree or lxml [semi-negotiable]. Here is my best attempt at unescapeing the parser output as efficiently as possible: import re def unescape(s, subber=re.compile(r'_x[0-9A-Fa-f]{4,4}_').sub, repl=lambda mobj: unichr(int(mobj.group(0)[2:6], 16)), ): if "_" in s: return subber(repl, s) return s The above is biassed by observing a very low frequency of "_" in typical text and a better-than-doubling of speed by avoiding the regex apparatus where possible. The question: Any better ideas out there?

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  • jQuery returning two elements for each one it finds?

    - by John Rudy
    I'll start by saying I'm fairly new to jQuery. For the most part, I've found it intuitive and powerful, but this one circumstance has me thoroughly stumped. In the following method, the call to .each() returns two elements for every one found. It iterates over a set of table rows given IDs starting with the word, "communication," and followed by an ID number. For each row it returns, it processes twice. Using Firebug, I've validated that the DOM only has a single instance of each table row in question. Also using Firebug, I've validated that the method is not being called twice; the iteration in .each() is truly going over each returned table row twice. By the time all the AJAX call goodness is done, I'll have two entries in the database for each row created in the table. This is the code that's causing the issues: function getCommunications() { var list = $('[id^=communication]'); var communications = new Array(); list.each(function () { var communication = { ID: $(this).find('.commCompanyID').val(), /* * SNIP: more object properties here that are * unnecessary to this discussion */ }; communications.push(communication); }); return communications; } At the point of return communications, the Array returned will contain twice as many elements as there are table rows. I should note that nearly identical code (but going against specific lists of divs) is working on the same page. It's just the table that's suffering the issues. I'm using jQuery 1.4.1, the version which shipped with Visual Studio .NET 2010. The table markup is fully dynamic -- that is, aside from the header row, it's dependent on data either returned at page load or created by the user via a dialog box. I'll drop in just the code for what's created at page load; again using Firebug I've validated that what I create dynamically when an end user creates a row with the dialog box matches. (This should be readable by anyone, but for the record this is an ASP.NET MVC 2.0 project.) <table id="commTable"> <tr> <th></th> <th> Date / Time </th> <th> Contact </th> <th> Type </th> <th> Duration </th> <th> Notes </th> </tr> <% foreach (var item in Model) { %> <tr id="communication<%: item.ID %>"> <td> <a href="#" onclick="showEditCommunicationForm(<%: item.ID %>"> Edit</a> <span class="commDeleteButton"> <a href="#" onclick="deleteCommunication(<%: item.ID %>)"> Delete</a> </span> </td> <td> <span class="commDateTime"><%: item.DateTime %></span> <input type="hidden" class="commID" value="<%: item.ID %>" /> <input type="hidden" class="commIsDeleted" value="<%: item.IsDeleted %>" /> </td> <td> <span class="commSourceText"><%: item.Company.CompanyName %></span> <input type="hidden" class="commCompanyID" value="<%: item.CompanyID %>" /> </td> <td> <%: item.CommunicationType.CommunicationTypeText %> <input type="hidden" class="commTypeID" value="<%: item.CommunicationTypeID %>" /> </td> <td> <span class="commDuration"><%: item.DurationMinutes %></span> Minutes </td> <td> <span class="commNotes"><%: item.Notes %></span> </td> </tr> <% } %> </table>

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  • R: ggplot2, how to get the parameters from a plotted linear model smoother?

    - by John
    I have a data.frame with 3 time series in it, shown below. When I plot them with a smoother time series, I want to be able to get the parameters of the linear model that I plot, but I can't see how to do that? > data day od series_id 1 1 0.10 A1 2 3 1.00 A1 3 5 0.50 A1 4 7 0.70 A1 5 1 1.70 B1 6 3 1.60 B1 7 5 1.75 B1 8 7 1.70 B1 9 1 2.10 C1 10 3 2.30 C1 11 5 2.50 C1 12 7 2.70 C1 data = data.frame (day = c(1,3,5,7,1,3,5,7,1,3,5,7), od = c(0.1,1.0,0.5,0.7 ,1.7,1.6,1.75,1.7 ,2.1,2.3,2.5,2.7), series_id = c("A1", "A1", "A1","A1", "B1", "B1","B1", "B1", "C1","C1", "C1", "C1")) r <- ggplot(data = data, aes(x = day, y = od)) r + stat_smooth(aes(group = series_id, color = series_id),method="lm")

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