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  • JDBC/OSGi and how to dynamically load drivers without explicitly stating dependencies in the bundle?

    - by Chris
    Hi, This is a biggie. I have a well-structured yet monolithic code base that has a primitive modular architecture (all modules implement interfaces yet share the same classpath). I realize the folly of this approach and the problems it represents when I go to deploy on application servers that may have different conflicting versions of my library. I'm dependent on around 30 jars right now and am mid-way though bnding them up. Now some of my modules are easy to declare the versioned dependencies of, such as my networking components. They statically reference classes within the JRE and other BNDded libraries but my JDBC related components instantiate via Class.forName(...) and can use one of any number of drivers. I am breaking everything up into OSGi bundles by service area. My core classes/interfaces. Reporting related components. Database access related components (via JDBC). etc.... I wish for my code to be able to still be used without OSGi via single jar file with all my dependencies and without OSGi at all (via JARJAR) and also to be modular via the OSGi meta-data and granular bundles with dependency information. How do I configure my bundle and my code so that it can dynamically utilize any driver on the classpath and/or within the OSGi container environment (Felix/Equinox/etc.)? Is there a run-time method to detect if I am running in an OSGi container that is compatible across containers (Felix/Equinox/etc.) ? Do I need to use a different class loading mechanism if I am in a OSGi container? Am I required to import OSGi classes into my project to be able to load an at-bundle-time-unknown JDBC driver via my database module? I also have a second method of obtaining a driver (via JNDI, which is only really applicable when running in an app server), do I need to change my JNDI access code for OSGi-aware app servers?

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  • Passing Validation exceptions via WCF REST

    - by Coppermill
    I am using WCF and REST, and I have complex types, which are working fine. Now I need to check for validation, I am thinking of using DataAnnotations e.g. public class Customer { [Required] public string FirstName {get;set;} } Now where the issue is how do I pass this validation down to the REST service? ALso I need to validate the object when it comes back, and throw an exception, if I am to throw an exception then what is the best way of doing this using REST?

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  • Disable capture tone of nokia E71

    - by Eric
    I want to disable the capture tone of my nokia E71,but there isn't disable option in the configuration,only four types of tone to select. Is there a method to do this? PS,I know some other phone has capture tone disable option.

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  • Java unchecked method invocation

    - by Sam
    I'm trying to setup a multithreaded application using SQLite4java, and everything is working fine. However, according to the getting started tutorial I am meant to create an object of type "object" and in order to return a value of null (due to use of generic types). Here is the suggested code: queue.execute(new SQLiteJob<Object>() { protected Object job(SQLiteConnection connection) throws SQLiteException { // this method is called from database thread and passed the connection connection.exec(...); return null; } }); Source The following example code I created produces the same error: error: test.java:9: warning: [unchecked] unchecked method invocation: <T,J>execute(J) in com.almworks.sqlite4java.SQLiteQueue is applied to (query<java.lang.Integer>) queue.execute(new query<Integer>()); test.java: import com.almworks.sqlite4java.*; import java.util.ArrayList; import java.io.File; class test{ public static void main(String[] args){ File f = new File("file.db"); SQLiteQueue queue = new SQLiteQueue(f); queue.execute(new query<Integer>()); } } query.java: import com.almworks.sqlite4java.SQLiteException; import com.almworks.sqlite4java.SQLiteJob; import com.almworks.sqlite4java.SQLiteConnection; import com.almworks.sqlite4java.SQLiteStatement; import java.util.ArrayList; class query<T> extends SQLiteJob{ protected ArrayList<Integer> job(SQLiteConnection connection) throws SQLiteException{ ArrayList<Integer> ints = new ArrayList<Integer>(); //DB Stuff return ints; } } I have read a lot about how this particular message appears when people fail to specify a type for an ArrayList. However, I am not attempting to cast the object or do anything with it. It is merely a mechanism implemented by the library developers in order to return a null. I do not believe this to be an issue relating directly to the library, which is why I'm asking this on StackOverflow. I believe it all comes down to my lack of experience with generic types. I've already spent a few hours on this and don't feel like I am getting anywhere. How do I stop the warning?

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  • breakdown c++ code size

    - by Evan Rogers
    I'm looking for a nice stackoverflow-style answer to the first question in this old blog post, which I'll repeat below: "I’d really like some tool (ideally, g++ based) that shows me what parts of compiled/linked code are generated from what parts of C++ source code. For instance, to see whether a particular template is being instantiated for hundreds of different types (fixable via a template specialization) or whether code is being inlined excessively, or whether particular functions are larger than expected."

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  • Dynamically created jagged rectangular array

    - by gagar1n
    In my project I have a lot of code like this: int[][] a = new int[firstDimension][]; for (int i=0; i<firstDimension; i++) { a[i] = new int[secondDimension]; } Types of elements are different. Is there any way of writing a method like createArray(typeof(int), firstDimension, secondDimension); and getting new int[firstDimension][secondDimension]? Once again, type of elements is known only at runtime.

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  • TFS Client APIs for creating workitem templates?

    - by amazedsaint
    Of course, it is pretty possible to create work items, get a list of work items etc in TFS. In addition to this, we need to have the functionality of allowing our users to create their own work item templates, for various file types. Whether the TFS Client APIs are capable of uploading work item templates to TFS server?

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  • What is Lazy Loading?

    - by Brian Boatright
    What is Lazy Loading? [Edit after reading a few answers] Why do people use this term so often? Say you just use a ASP/ADO recordset and load it with data or ADO.NET Datasource for a gridview. I guess I should have asked why people use the term Lazy Loading, what "other" types are their?

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  • Javascript Chart to Excel

    - by George
    Hi I'm using highcharts to create some charts (pie, bar, etc...) using just Javascript. These charts do not use Flash or anything like that. Is it possible for me to convert the resulting HTML page with the Javascript chart to an excel document that properly shows the image? I've tried the standard change mime types for excel and so far I've only been able to export an HTML table on the page, but no chart.

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  • Using Castle DynamicProxy is it possible to change the invocation target on class proxy?

    - by Gareth D
    Hi Using Castle DynamicProxy v2, I'd like to change the target of an invocation for a class proxy. The new target is simply a different instance of the same type as the original target. The target types do not implement a common interface so I cannot use the IProxyTargetAccessor as detailed in Krzysztof's post on the subject - I cannot cast from a class proxy invocator to a IProxyTargetAccessor. Is there a way to do this?

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  • Django - Testing with parts of original database

    - by Murkin
    Hello everyone, My database has two types of entries: The very dynamic (users, comments, etc) and the more static (email templates, flat-pages). During testing I want a clean DB but with the real 'semi-static' data. Is there a way to make Django's testing system to load parts of the original DB ? Thanks

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  • What is JAF? What is its purpose?

    - by Manoj
    Hi All, I am unable to understand the purpose of JAF(java activation Framework). Please explain me in simple terms or else where can i find simple material to learn. In Java Mail API, they are using JAF. I read, it was like finding the supporting data types of an object. But i couldn't understand. Please teach me!!

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  • Enum as a Parameter in Dynamics AX

    - by Lauren
    My report has a parameter which uses a base enum. The enum has 4 different options to choose when running the report. How do I insert an option which uses all 4 at once? For example, I have an enum named Phone and it has 4 types: 1 = None, 2 = Home, 3 = Mobile, 4 = Work. In a drop down, how do I add option 5 = None+Home+Mobile+Work? Thank you!

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  • C# Custom data type!

    - by Betamoo
    After I decided at last to implement my Int128 in C#, I thought it would be nice to make it look like other dotNet data types.. But I could not implement the following feature: suffix initialization: such as 13L and 0.2D Can I make my own suffix in C#? And if I can not.. how can I initialize it? i.e Int128 a= ??

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  • Why is FLT_MIN equal to zero on OS X?

    - by Nick Forge
    limits.h specifies limits for non-floating point math types, e.g. INT_MIN and INT_MAX. These values are the most negative and most positive values that you can represent using an int. In float.h, there are definitions for FLT_MIN and FLT_MAX. If you do the following: NSLog(@"%f %f", FLT_MIN, FLT_MAX); You get the following output: FLT_MIN = 0.000000, FLT_MAX = 340282346638528859811704183484516925440.000000 FLT_MAX is equal to a really large number, as you would expect, but why does FLT_MIN equal zero?

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  • Let the user choose what type of document to open

    - by Koning Baard XIV
    I'm creating an NSDocument application, with two document types: Website and Webservice. This is in my Info.plist: <key>CFBundleDocumentTypes</key> <array> <dict> <key>CFBundleTypeName</key> <string>Website</string> <key>CFBundleTypeExtensions</key> <array> <string>website</string> </array> <key>LSTypeIsPackage</key> <true/> <key>CFBundleTypeRole</key> <string>Editor</string> <key>LSHandlerRank</key> <string>Default</string> <key>NSDocumentClass</key> <string>AWWebSite</string> </dict> <dict> <key>CFBundleTypeName</key> <string>Web Service</string> <key>CFBundleTypeExtensions</key> <array> <string>webservice</string> </array> <key>LSTypeIsPackage</key> <true/> <key>CFBundleTypeRole</key> <string>Editor</string> <key>LSHandlerRank</key> <string>Default</string> <key>NSDocumentClass</key> <string>AWWebService</string> </dict> </array> Now, whenever the user opens the application, selects the 'New' item from the menubar, or clicks the Dock icon while there are no open windows, I want to show a window with two options, each for one of the document types. Can anyone help me with this? Thanks

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  • What are the benefits of using ORM over XML Serialization/Deserialization?

    - by Tequila Jinx
    I've been reading about NHibernate and Microsoft's Entity Framework to perform Object Relational Mapping against my data access layer. I'm interested in the benefits of having an established framework to perform ORM, but I'm curious as to the performance costs of using it against standard XML Serialization and Deserialization. Right now, I develop stored procedures in Oracle and SQL Server that use XML Types for either input or output parameters and return or shred XML depending on need. I use a custom database command object that uses generics to deserialize the XML results into a specified serializable class. By using a combination of generics, xml (de)serialization and Microsoft's DAAB, I've got a process that's fairly simple to develop against regardless of the data source. Moreover, since I exclusively use Stored Procedures to perform database operations, I'm mostly protected from changes in the data structure. Here's an over-simplified example of what I've been doing. static void main() { testXmlClass test = new test(1); test.Name = "Foo"; test.Save(); } // Example Serializable Class ------------------------------------------------ [XmlRootAttribute("test")] class testXmlClass() { [XmlElement(Name="id")] public int ID {set; get;} [XmlElement(Name="name")] public string Name {set; get;} //create an instance of the class loaded with data. public testXmlClass(int id) { GenericDBProvider db = new GenericDBProvider(); this = db.ExecuteSerializable("myGetByIDProcedure"); } //save the class to the database... public Save() { GenericDBProvider db = new GenericDBProvider(); db.AddInParameter("myInputParameter", DbType.XML, this); db.ExecuteSerializableNonQuery("mySaveProcedure"); } } // Database Handler ---------------------------------------------------------- class GenericDBProvider { public T ExecuteSerializable<T>(string commandText) where T : class { XmlSerializer xml = new XmlSerializer(typeof(T)); // connection and command code is assumed for the purposes of this example. // the final results basically just come down to... return xml.Deserialize(commandResults) as T; } public void ExecuteSerializableNonQuery(string commandText) { // once again, connection and command code is assumed... // basically, just execute the command along with the specified // parameters which have been serialized. } public void AddInParameter(string name, DbType type, object value) { StringWriter w = new StringWriter(); XmlSerializer x = new XmlSerializer(value.GetType()); //handle serialization for serializable classes. if (type == DbType.Xml && (value.GetType() != typeof(System.String))) { x.Serialize(w, value); w.Close(); // store serialized object in a DbParameterCollection accessible // to my other methods. } else { //handle all other parameter types } } } I'm starting a new project which will rely heavily on database operations. I'm very curious to know whether my current practices will be sustainable in a high-traffic situation and whether or not I should consider switching to NHibernate or Microsoft's Entity Framework to perform what essentially seems to boil down to the same thing I'm currently doing. I appreciate any advice you may have.

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  • C++ type-checking at compile-time

    - by Masterofpsi
    Hi, all. I'm pretty new to C++, and I'm writing a small library (mostly for my own projects) in C++. In the process of designing a type hierarchy, I've run into the problem of defining the assignment operator. I've taken the basic approach that was eventually reached in this article, which is that for every class MyClass in a hierarchy derived from a class Base you define two assignment operators like so: class MyClass: public Base { public: MyClass& operator =(MyClass const& rhs); virtual MyClass& operator =(Base const& rhs); }; // automatically gets defined, so we make it call the virtual function below MyClass& MyClass::operator =(MyClass const& rhs); { return (*this = static_cast<Base const&>(rhs)); } MyClass& MyClass::operator =(Base const& rhs); { assert(typeid(rhs) == typeid(*this)); // assigning to different types is a logical error MyClass const& casted_rhs = dynamic_cast<MyClass const&>(rhs); try { // allocate new variables Base::operator =(rhs); } catch(...) { // delete the allocated variables throw; } // assign to member variables } The part I'm concerned with is the assertion for type equality. Since I'm writing a library, where assertions will presumably be compiled out of the final result, this has led me to go with a scheme that looks more like this: class MyClass: public Base { public: operator =(MyClass const& rhs); // etc virtual inline MyClass& operator =(Base const& rhs) { assert(typeid(rhs) == typeid(*this)); return this->set(static_cast<Base const&>(rhs)); } private: MyClass& set(Base const& rhs); // same basic thing }; But I've been wondering if I could check the types at compile-time. I looked into Boost.TypeTraits, and I came close by doing BOOST_MPL_ASSERT((boost::is_same<BOOST_TYPEOF(*this), BOOST_TYPEOF(rhs)>));, but since rhs is declared as a reference to the parent class and not the derived class, it choked. Now that I think about it, my reasoning seems silly -- I was hoping that since the function was inline, it would be able to check the actual parameters themselves, but of course the preprocessor always gets run before the compiler. But I was wondering if anyone knew of any other way I could enforce this kind of check at compile-time.

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  • Generate money type fields using code first EF CTP5

    - by BBHorus
    In this blog post: EF4 Code First Control Unicode and Decimal Precision, Scale with Attributes, Dane Morgridge used attributes to control the creation of different types on your database. ...And I found this pretty unique BTW!!! How do I generate money type fields in my resulting database using code first API of EF CTP5, if is possible to do it from your model, using conventions or attributes? Sorry about my English is not my main language. Thanks in advance.

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  • strcasecmp in C returns 156 instead of 0, any ideas why?

    - by hora
    I have the following code: printf("num: %d\n", strcasecmp(buf, "h\n")); And I get the following results when I try plugging in different letters: a: -7 g: -1 i: 1 j: 2 h: 156 H: 156 Should strcasecmp not return 0 when buf is equal to H or h? Any ideas why it's returning 156? I need to figure out how to check whether the user types H or h. Thanks!

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  • Correct way to model recursive relationship in Django

    - by Yuval A
    My application has two node types: a parent node which can hold recursive child nodes. Think of it like the post-comment system in SO, but comments can be recursive: parent_1 child_11 child_12 child_121 child_3 parent_2 child_21 child_211 child_2111 Important to note that the parent nodes have different attributes and behavior than the child nodes. What is the correct (and presumably most efficient) way of modeling this relationship in Django?

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