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• How to find foreign-key dependencies pointing to one record in Oracle?

  - by daveslab

  Hi folks, I have a very large Oracle database, with many many tables and millions of rows. I need to delete one of them, but want to make sure that dropping it will not break any other dependent rows that point to it as a foreign key record. Is there a way to get a list of all the other records, or at least table schemas, that point to this row? I know that I could just try to delete it myself, and catch the exception, but I won't be running the script myself and need it to run clean the first time through. I have the tools SQL Developer from Oracle, and PL/SQL Developer from AllRoundAutomations at my disposal. Thanks in advance!

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• Why does casting a NaN to a long yeild a valid result?

  - by brainimus

  In the sample code below I am dividing by zero which when I step through it with the debugger the (dividend / divisor) yeilds an Infinity or NaN (if the divisor is zero). When I cast this result to a long I get a valid result, usually something like -9223372036854775808. Why is this cast valid? Why doesn't it stop executing (throw an exception for example) rather than assign an arbitrary value? double divisor = 0; double dividend = 7; long result = (long)(dividend / divisor);

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• EntityFramwork System.OutOfMemoryException on 100MB upload

  - by Win

  Upload works fine for 62MB file. However, it throws exception if it is 100MB. I found few questions in stackoverflow, but none is very specific about datatype. Appreciate your help! ASP.Net 4, IIS7, EntityFramework 4.1, Visual Studio 2010 SP1, SQL 2008 DataType is varbinary(max) applicationHost.config <section name="requestFiltering" overrideModeDefault="Allow" /> web.config <httpRuntime maxRequestLength="1148576" executionTimeout="3600"/> <security > <requestFiltering> <requestLimits maxAllowedContentLength="112400000" /> </requestFiltering> </security>

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• Azure Blobs - ArgumentNullException when calling UploadFile()

  - by Ariel

  I’m getting the following exception when trying to upload a file with the following code: string encodedUrl = "videos/Sample.mp4" CloudBlockBlob encodedVideoBlob = blobClient.GetBlockBlobReference(encodedUrl); Log(string.Format("Got blob reference for {0}", encodedUrl), EventLogEntryType.Information); encodedVideoBlob.Properties.ContentType = contentType; encodedVideoBlob.Metadata[BlobProperty.Description] = description; encodedVideoBlob.UploadFile(localEncodedBlobPath); I see the "Got blob reference" message, so I assume the reference resolves correctly. Void Run() C:\Inter\Projects\PoC\WorkerRole\WorkerRole.cs (40) System.ArgumentNullException: Value cannot be null. Parameter name: value at Microsoft.WindowsAzure.StorageClient.Tasks.Task`1.get_Result() at Microsoft.WindowsAzure.StorageClient.Tasks.Task`1.ExecuteAndWait() at Microsoft.WindowsAzure.StorageClient.CloudBlob.UploadFromStream(Stream source, BlobRequestOptions options) at Microsoft.WindowsAzure.StorageClient.CloudBlob.UploadFile(String fileName, BlobRequestOptions options) at EncoderWorkerRole.WorkerRole.ProcessJobOutput(IJob job, String videoBlobToEncodeUrl) in C:\Inter\Projects\PoC\WorkerRole\WorkerRole.cs:line 144 at EncoderWorkerRole.WorkerRole.Run() in C:\Inter\Projects\PoC\WorkerRole\WorkerRole.cs:line 40 Interestingly, I'm running that same snippet from an on-premises server i.e., outside of Azure and it works correctly. Ideas welcome, thanks!

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• Using Drools to provide error processing and consequence management

  - by Mike

  Hi, I am working on a module whose purpose is to process Java exceptions and decide upon a strategy for dealing with them. The exceptions could be things I know about (explicit business exceptions eg TransformationException) or more general environmental stuff (JMS errors, IO errors etc) The facts inserted into the knowledge base are all the same class, and wrap (contain) an Exception. I want to write a rule that will explicitly match the exceptions I know how to deal with (eg TransformationException) and have another rule that catches 'everything else' The problem seems to me to be that for a fact containing a TransformationException, both rules will fire and the output will be uncertain. How would I go about writing such exclusive rules without relying on salience to steer the order of execution (this seems to be bad practice from what I have read)? I have a solution in place that I am not happy with whereby the outcome depends on the order in which the rules are defined in my .drl.

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• Capistrano SSH::AuthenticationFailed, not prompting for password

  - by Sparkmasterflex

  I've been using capistrano successfully for a while now and all of a sudden in every project I've lost the ability to deploy. Environment: os X (Mavericks) ruby 1.9.3p194 rvm (locally, not on server) rails 3.2 and up RubyGems 1.8.25 I'm not using rsa_keys or anything I want capistrano to prompt for user and password. Suddenly it has decided not to ask for a password, but does ask for user. Then it rolls back and gives me the following error. [deploy:update_code] exception while rolling back: Capistrano::ConnectionError, connection failed for: sub.example.com (Net::SSH::AuthenticationFailed: Authentication failed for user [email protected]) connection failed for: sub.example.com (Net::SSH::AuthenticationFailed: Authentication failed for user [email protected]) This has occurred on my personal laptop and my iMac at work. It occurs when deploying to two different servers (both linux) I'm completely at a loss here. Any ideas?

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• Hierarchy of modules in guice

  - by Niko

  Hi, I'd like to run a unit test where a constant is slightly different than in the standard version. That is, in my default module, the following is bindConstant().annotatedWith(Names.named("number of players")).to(4); but in testing, I'd like to try this line instead: bindConstant().annotatedWith(Names.named("number of players")).to(2); Id like to achieve that without copying all of the rest of the module. What I really want is a "default" module that is "below" a more specialized module, such that in case of conflict, the specialized module wins (instead of throwing an exception, which is what guice does). In essence, my question is: how does anybody arrange for more than one module without lots of code duplication?

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• How can i use listDictionary?

  - by Phsika

  i can fill my listdictinary but, if running error returns to me in " foreach (string ky in ld.Keys)"(invalid operation Exception was unhandled) Error Detail : After creating a pointer to the list of sample collection has been changed. C# ListDictionary ld = new ListDictionary(); foreach (DataColumn dc in dTable.Columns) { MessageBox.Show(dTable.Rows[0][dc].ToString()); ld.Add(dc.ColumnName, dTable.Rows[0][dc].ToString()); } foreach (string ky in ld.Keys) if (int.TryParse(ld[ky].ToString(), out QuantityInt)) ld[ky] = "integer"; else if(double.TryParse(ld[ky].ToString(), out QuantityDouble)) ld[ky]="double"; else ld[ky]="nvarchar";

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• respond_to? and protected methods

  - by mlomnicki

  It may not be so obvious how respond_to? works in ruby. Consider that: class A def public_method end protected def protected_method end private def private_method end end obj = A.new obj.respond_to?(:public_method) # true - that's pretty obvious obj.respond_to?(:private_method) # false - as expected obj.respond_to?(:protected_method) # true - WTF? So if 'obj' responds to protected_method we should expect obj.protected_method not to raise an exception, shouldn't we? ...but it raises obviously Documentation points that calling respond_to? with 2nd argument set to true check private method as well obj.respond_to?(:private_method, true) # true And that's far more reasonable So the question is how to check if object responds to public method only? Is there a solution better than that? obj.methods.include?(:public_method) # true obj.methods.include?(:protected_method) # false

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• Tag property null when data binding

  - by rotary_engine

  Can anyone see what is wrong with this? The Tag property is returning null however the Binding for Id property is definately returning an int value. <ListBox ItemsSource="{Binding ElementName=myDomainDataSource, Path=Data}"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Path=Id, Mode=OneWay}" /> <HyperlinkButton Content="Edit" Tag="{Binding ElementName=Id, Mode=OneWay}" Click="Edit_Click" /> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> and then... private void Edit_Click(object sender, RoutedEventArgs e) { ContentControl c = sender as ContentControl; // exception - c.Tag is null int id = (int)c.Tag; } The Id property is showing a value on the UI, but doesn't seem to be getting stored in the buttons Tag property.

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• Java Thread - Synchronization issue

  - by Yatendra Goel

  From Sun's tutorial: Synchronized methods enable a simple strategy for preventing thread interference and memory consistency errors: if an object is visible to more than one thread, all reads or writes to that object's variables are done through synchronized methods. (An important exception: final fields, which cannot be modified after the object is constructed, can be safely read through non-synchronized methods, once the object is constructed) This strategy is effective, but can present problems with liveness, as we'll see later in this lesson. Q1. Is the above statements mean that if an object of a class is going to be shared among multiple threads, then all instance methods of that class (except getters of final fields) should be made synchronized, since instance methods process instance variables?

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• Architecture Suggestions/Recommendations for a Web Application with Sub-Apps

  - by user579218

  Hello. I’m starting to plan an architecture for a big web application, and I wanted to get suggestions and/or recommendations on where to begin and which technologies and/or frameworks to use. The application will be an Intranet-based web site using Windows authentication, running on IIS and using SQL Server and ASP.NET. It’ll need to be structured as a main/shell application with sub-applications that are “pluggable” based on some configuration settings. The main or shell application is to provide the overall user interface structure – header/footer, dynamically built tabs for each available sub-app, and a content area in which the sub-application will be loaded when the user clicks on the sub-application’s tab. So, on start-up of the main/shell application, configuration information will be queried from a database, and, based on the user and which of the sub-apps are available, the main or shell app would dynamically build tabs (or buttons or something) as a way to access each individual application. On start-up, the content area will be populated with the “home” sub-app. But, clicking on an sub-app tab will cause the content area to be populated with the sub-app corresponding to the tab. For example, we’re going to have a reports application, a display application, and probably a couple other distinct applications. On startup of the main/shell application, after determining who the user is, the main app will query the database to determine which sub-apps the user can use and build out the UI. Then the user can navigate between available sub-apps and do their work in each. Finally, the entire app and all sub-apps need to be a layered design with presentation, service, business, and data access layers, as well as cross-cutting objects for things such as logging, exception handling, etc. Anyway, my questions revolve around where to begin to plan something like this application. What technologies/frameworks would work best in developing a solution for this application? MVC? MVP? WCSF? EF? NHibernate? Enterprise Library? Repository Pattern? Others???? I know all these technologies/frameworks are not used for the same purpose, but knowing which ones to focus on is a little overwhelming. Which ones would be the best choice(s) for a solution? Which ones work well together for an end-to-end design? How would one structure the VS project for something like this? Thanks!

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• MassTransit Saga - Errors & Inconsistencies

  - by Tolu

  I've implemented a masstransit saga that works as should, a lot of times. However, there are times when the messages go to the error queue or just seem to disappear. I'd like to know: 1. How do I get the reason/exception message that causes a message to go to the error queue? (NOTE: My handler logic is within a try-catch block so apparently these errors happen even before the handler logic is called) 2. What could be responsible for the lost messages? Thanks in advance.

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• C# Serial Communications - Received Data Lost

  - by Jim Fell

  Hello. Received data in my C# application is getting lost due to the collector array being over-written, rather than appended. private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e) { try { pUartData_c = serialPort1.ReadExisting().ToCharArray(); bUartDataReady_c = true; } catch ( System.Exception ex ) { MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } In this example pUartData_c is over-written every time new data is received. On some systems this is not a problem because the data comes in quickly enough. However, on other systems data in the receive buffer is not complete. How can I append received data to pUartData_c, rather than over-write it. I am using Microsoft Visual C# 2008 Express Edition. Thanks.

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• iPhone, how to dyanmic create new entity (table) via core data model?

  - by Robin

  as topic, I just want create new Entity(table) in sqlite , my code as follows: +(BOOL)CreateDataSet:(NSManagedObjectModel *) model attributes:(NSDictionary*)attributes entityName:(NSString*) entityName { NSEntityDescription *entityDef = [[NSEntityDescription alloc] init]; [entityDef setName:entityName]; [entityDef setManagedObjectClassName:entityName]; [model setEntities:[NSArray arrayWithObject:entityDef]]; //@step NSArray *properties = [CoreDataHelper CreateAttributes:attributes]; [entityDef setProperties:properties]; [entityDef release]; return TRUE; } but it throw errors: Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Can't modify an immutable model.' * Call stack at first throw: ( 0 CoreFoundation 0x01c5abe9 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x01daf5c2 objc_exception_throw + 47 2 CoreData 0x0152634a -[NSManagedObjectModel(_NSInternalMethods) _throwIfNotEditable] + 106 3 CoreData 0x01526904 -[NSManagedObjectModel setEntities:] + 36 .... that seem show the model is read only..... anyone can help on this problem? thanks

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• How to check if a pointer is null in C++ Visual 2010

  - by mariomario

  I am having problems here if I want to check if eerste points to nothing i get Blockquote Unhandled exception at 0x003921c6 in Bank.exe: 0xC0000005: Access violation reading location 0xccccccd0. and i am kinda wondering why he justs skips the if statement or doens't stop when the object eerste points to nothing Bank::Bank() { LijstElement *eerste = NULL; LijstElement *laatste = NULL; } Rekening * Bank::getRekening(int rekNr) { if(NULL != eerste) { LijstElement *nummer = eerste; while(nummer->volgende!= NULL) { Rekening *een = nummer->getRekening(); if(een->getRekNr()==rekNr) { return een; } else { nummer = nummer->volgende; } } } return NULL; }

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• how to find datakeys in oncheckedchanged event ?

  - by subodh

  <asp:Panel ID="pnlFocusAreaPanel" runat="server" GroupingText="Focus Area" Width="800"> <table cellspacing="0" cellpadding="0" width="750"> <tr> <td> <asp:GridView ID="dgFocusAreaDetails" runat="server" Width="100%" CssClass="dgStyle" AutoGenerateColumns="False" BorderColor="Silver" BorderWidth="1px" CellPadding="0" ShowHeader="False" OnSelectedIndexChanged="dgFocusAreaDetails_SelectedIndexChanged" DataKeyNames="PK_ID"> <FooterStyle Font-Underline="True" HorizontalAlign="Center" VerticalAlign="Middle"> </FooterStyle> <Columns> <asp:TemplateField HeaderText="Focus Area" HeaderStyle-BackColor="Silver"> <ItemStyle Width="90%" /> <ItemTemplate> <asp:Label runat="server" ID="lblFocusArea" Text='<%# DataBinder.Eval(Container.DataItem, "FOCUS_AREA_NAME").ToString()%>'> </asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Is Current Valid" HeaderStyle-BackColor="Silver"> <ItemStyle Width="10%" HorizontalAlign="Center" /> <ItemTemplate> <asp:CheckBox ID="chkFocusArea" runat="server" OnCheckedChanged="OnCheckChangedEvent" AutoPostBack="true" /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </td> </tr> <tr> <td align="left"> <asp:TextBox ID="txtFocusArea" runat="server" Width="300px" CausesValidation="true" CssClass="txtStyle" ValidationGroup="focusArea"> </asp:TextBox> <cc1:TextBoxWatermarkExtender ID="txtFocusAreaWaterMark" runat="server" TargetControlID="txtFocusArea" WatermarkText="Add Focus Area" WatermarkCssClass="WaterMarkStyle"> </cc1:TextBoxWatermarkExtender> <asp:Button ID="btnAddFocusArea" runat="server" Text="AddFocusArea" CssClass="btnStyle" OnClick="btnAddFocusArea_Click" CausesValidation="true" ValidationGroup="focusArea" /> <asp:RequiredFieldValidator ID="reqtxtFocusArea" runat="server" ControlToValidate="txtFocusArea" ErrorMessage="Please enter focus area" Display="Dynamic" ValidationGroup="focusArea"> </asp:RequiredFieldValidator> <asp:RegularExpressionValidator ID="regexFocusArea" runat="server" ErrorMessage="Invalid characters(<,>,#)" ControlToValidate="txtFocusArea" ValidationExpression="^([^&lt;#&gt;]*)$" ValidationGroup="focusArea" Display="Dynamic" SetFocusOnError="true"> </asp:RegularExpressionValidator> </td> </tr> </table> </asp:Panel> and in code behind protected void btnAddFocusArea_Click(object sender, EventArgs e) { string strFocusArea = txtFocusArea.Text; OleDbConnection myConnection = new OleDbConnection(ConfigurationSettings.AppSettings["SQLConnectionString"]); if (strFocusArea == string.Empty || strFocusArea == txtFocusAreaWaterMark.WatermarkText) { lblError.Text = "Focus area is not entered"; } else { string insertQuery = "INSERT INTO LK_CODECAT_FOCUS_AREA(FOCUS_AREA_NAME,FK_ADDED_BY,ADDED_ON) "+ " VALUES('" + strFocusArea + "', "+Session["UserID"] +", GETDATE())"; try { myConnection.Open(); OleDbCommand myCommandToInsert = new OleDbCommand(insertQuery, myConnection); myCommandToInsert.ExecuteNonQuery(); } catch(Exception exc) { ExceptionLogger.LogException(exc); } finally { if (myConnection != null) { myConnection.Close(); } } PopulateFocusArea(); } txtFocusArea.Text = txtFocusAreaWaterMark.WatermarkText; } private void PopulateFocusArea() { OleDbConnection myConnection = new OleDbConnection(ConfigurationSettings.AppSettings["SQLConnectionString"]); string selectQuery = "SELECT PK_ID, FOCUS_AREA_NAME, IS_CURRENT_FOCUS FROM LK_CODECAT_FOCUS_AREA LKCFA ORDER BY FOCUS_AREA_NAME"; if (Session["RoleID"].ToString() == "1" || ((Session["WorkID"].ToString() != "9") || (Session["WorkID2"].ToString() != "9") || (Session["WorkID3"].ToString() != "9"))) { try { myConnection.Open(); OleDbCommand myCommandFocusArea = new OleDbCommand(selectQuery, myConnection); OleDbDataAdapter myAdapter = new OleDbDataAdapter(myCommandFocusArea); DataSet ds = new DataSet(); myAdapter.Fill(ds); dgFocusAreaDetails.DataSource = ds; dgFocusAreaDetails.ShowHeader = true; dgFocusAreaDetails.DataBind(); } catch (Exception exc) { ExceptionLogger.LogException(exc); } finally { if (myConnection != null) { myConnection.Close(); } } } } protected void dgFocusAreaDetails_SelectedIndexChanged(object sender, EventArgs e) { string selectedCategory = dgFocusAreaDetails.SelectedRow.Cells[1].Text; int index = dgFocusAreaDetails.SelectedIndex; lblError.Text = dgFocusAreaDetails.DataKeys[index].Value.ToString(); } public void OnCheckChangedEvent(object sender, EventArgs e) { CheckBox chk = (CheckBox)sender; string chkfocusarea = ((Control)chk).ID; //string focusAreaDetails = dgFocusAreaDetails.SelectedRow.Cells[0].Text; int index =Convert.ToInt32(dgFocusAreaDetails.SelectedIndex); if (chk.Checked) { string updateQuery = "UPDATE [LK_CODECAT_FOCUS_AREA] SET [IS_CURRENT_FOCUS] = 1 WHERE PK_ID = " +Convert.ToInt32( dgFocusAreaDetails.DataKeys[index].Value)+" "; } else { lblError.Text = "unchecked"; } } i want to know how i find the datakeyvalue on checked event.

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• Writing WCF messages to a text log in configurable directory.

  - by Arsh

  Hello everyone, I have a WCF web service that is deployed at IIS. Part of the web service is to validate the inputs using EntLib 4.1 For ex, the string values can be of specific length and so on. In case of the validation being failed a fault exception is raised and the service is supposed to write the message in log file. How do I go about creating the log file to a location that can be configured from a config file. Basically how do we write messages from IIS (since the service is hosted at IIS, I am assuming that that will be the source !!!!) Regards.

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• apache commons http client efficiency

  - by wo_shi_ni_ba_ba

  I use apache commons http client to send data via post every second, is there a way to make the following code more efficient? I know http is stateless, but is there anything I can do to improve since the base url is always the same in this case(only the parameter value change. private void sendData(String s){ try { HttpClient client = getHttpClient(); HttpPost method = new HttpPost("http://192.168.1.100:8080/myapp"); System.err.println("send to server "+s); List formparams = new ArrayList(); formparams.add(new BasicNameValuePair("packet", s)); UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8"); method.setEntity(entity); HttpResponse resp=client.execute(method); String res = EntityUtils.toString(resp.getEntity()); System.out.println(res); } catch (Exception e) { e.printStackTrace(); } } private HttpClient getHttpClient() { if(httpClient==null){ httpClient = new DefaultHttpClient(); } return httpClient; }

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• How can a string timestamp with hours 0 to 24 be parsed

  - by user897052

  I am trying to parse a string timestamp of format "yyyyMMddHHmmss" with DateTime.ParseExact(). The catch is I must allow for an hour value of "24" (i.e. hours can be from 0 to 24; Note: I can't control the input values.) and, of course, that results in an exception. Are there any settings/properties I can set instead of manually parsing/using regex's? If not, any efficient parsing ideas? ex. DateTime.ParseExact("20120911240000", "yyyyMMddHHmmss", System.Globalization.CultureInfo.InvariantCulture); hour 24 means hour 0 of next day (so day + 1, hour = 0)

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• ASP.NET web site running in IIS and hosting WCF service fails to get connections on the TCP server

  - by Salil

  I am using the combination of Silverlight client application along with ASP.NET web site running in IIS and hosting WCF service. This WCF service uses the library that starts a TCP server and and initiates requests to the connected TCP clients when the silverlight client application makes the WCF async requests. When I use this library in a local WPF application, the TCP server is able to receive client connection requests and I can get info from these clients. But when I use the same library from the implementation of the WCF service inside the ASP .NET web site project (+ Silverlight client), the server strangely does not receive any connection requests i.e. when I create TcpListener object and issue a start, nothing happens (nor an exception is generated). My setup is I am using the Ethernet for the Internet and Wi-Fi for the TCP clients. Is the WCF service getting confused because of this? Is there any special WCF settings I should put in for TcpListener.Start to work?

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• Windows Phone 7 Application + WCF + SSL + Username Authentication

  - by s7orm

  Hello, I have developed a test service with WCF, which I try to consume from a Windows Phone 7 Application, however when calling a method from the service I get a weird exception: There was no endpoint listening at https://server/Service.svc that could accept the message. This is often caused by an incorrect address or SOAP action. The WCF service uses a custom binding with UserNameOverTransport authentication and SSL. For the authorization I am using an implementation of the UserNamePasswordValidator. If I try to consume the service from a console or silverlight application (cross domain policy is enabled) - it works fine (authorization as well). And the most weird thing is that the ServiceReferences.ClientConfig file generated for the WP7 App is exactly the same as the config file generated for the silverlight application. I have no idea what is wrong with my service...

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• GUID.TryParse() ?

  - by Jack Marchetti

  Obviously there is no public GUID.TryParse() in .NET CLR 2.0. So, I was looking into regular expressions [aka googling around to find one] and each time I found one there was a heated argument in the comments section about RegEx A doesn't work, use RegEx B. Then someone would write Regex C yadda yadda So anyway, What I decided to do was this, but I feel bad about it. public static bool IsGuid (string possibleGuid) { try { Guid gid = new Guid(possibleGuid); return true; } catch (Exception ex) { return false; } } Obviously I don't really like this since it's been drilled into me since day one to avoid throwing exceptions if you can defensibly code around it. Does anyonek now why there is no public Guid.TryParse() in the .NET Framework? Does anyone have a real Regular Expression that will work for all GUIDs?

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• Thread Question

  - by Polaris

  I have method which create background thread to make some action. In this background thread I create object. But this object while creating in runtime give me an exception : The calling thread must be STA, because many UI components require this. I know that I must use Dispatcher to make reflect something to UI. But in this case I just create an object and dont iteract with UI. This is my code: public void SomeMethod() { BackgroundWorker worker = new BackgroundWorker(); worker.DoWork += new DoWorkEventHandler(Background_Method); worker.RunWorkerAsync(); } void Background_Method(object sender, DoWorkEventArgs e) { TreeView tv = new TreeView(); } How can I create objects in background thread? I use WPF application

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• What's causing "Unable to retrieve native address from ByteBuffer object"?

  - by r0u1i

  As a very novice Java programmer, I probably should not mess with that kind of things. Unfortunately, I'm using a library which have a method that accepts a ByteBuffer object and throws when I try to use it: Exception in thread "main" java.lang.NullPointerException: Unable to retrieve native address from ByteBuffer object Is it because I'm not using a non-direct buffer? edit: There's not a lot of my code there. The library I'm using is jNetPcap, and I'm trying to dump a packet to file. My code takes an existing packet, and extract a ByteBuffer out of it: byte[] bytes = m_packet.getByteArray(0, m_packet.size()); ByteBuffer buffer = ByteBuffer.wrap(bytes); Then it calls on of the dump methods of jNetPcap that takes a ByteBuffer.

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