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  • mapping Field with variable type using Hibernate Annotaion

    - by Zahra
    Hi. how can I have a field with variable type in my class? I use hibernate annotation for mapping to DB. I tried to use java.io.Serializable as field's type, but it mapped to database as a 01 amount which is true if I get it's object and cast it to it's true type. but I need to run a query on this objects that needs true amount of field.(right now I can't compare an integer field with a number) Does anyone have any idea how can I do this? Thanks in advance.

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  • Convert .jar to an OSX executable?

    - by Danny King
    Hello, I made a Java application which I would like to distribute on Windows, OSX and Linux without distributing a jar file. I used the great Windows exe wrapper http://launch4j.sourceforge.net/ to create an .exe file complete with my icon that won't scare Windows users. Are there similar wrappers that I can use for OSX/Unix? An important consideration is that I would like to have my own icon on the executable (especially for mac users). Thanks!

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  • com.mysql.jdbc.Driver classnotfoundException

    - by Mohammed_Q
    Im getting classnotfountexception on Class.forname("com.mysql.jdbc.Driver") im using: windows vista 64-bit, Eclipse Galileo, GWT framework i downloaded (mysql-connector-java-5.1.6-bin), but what the exact path i should add to. im getting this exception while im in gwt-projects, but normal projects working good, any idea how that should be done???...thanks

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  • Word documents generation in web app using Eclipse BIRT Report Engine

    - by Orr151
    Hi, Is it possible to generate word documents (*.doc) in java web application using Eclipse BIRT (Report Engine)? I want .rptdesign to be an input file in generating process. I could not find any example or tutorial. What would you recommend as an alternative solution. As far as I know Jasper Reports allow only RTF format generation. Thank you for your answer/explaination

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  • Converting back from toString to Object

    - by MontyBongo
    Is there any way to covert from toString back to the object in Java? For example: Map<String, String> myMap = new HashMap<String, String>(); myMap.put("value1", "test1"); myMap.put("value2", "test2"); String str = myMap.toString(); Is there any way to convert this String back to the Map?

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  • finally and return

    - by abson
    In the below example, class ex8 { public void show() { try { int a=10/0; return;} catch(ArithmeticException e) { System.out.println(e); return ;} finally { System.out.println("Finally"); } } public static void main(String[] args) { new ex8().show(); } } the output is: java.lang.ArithmeticException: / by zero Finally How is it that Finally gets printed in spite of return statement in catch?

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  • whiteboard application

    - by alice
    Hi..i wanted to develop a whiteboard application..i know the basics of java..but have no idea where to start from..so..i'd really appreciate if you could guide me..as in..where do i start from??..plz...i reallly need ths..

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  • whiteboard application

    - by alice
    Hi..i wanted to develop a whiteboard application..i know the basics of java..but have no idea where to start from..so..i'd really appreciate if you could guide me..as in..where do i start from??

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  • Standard Interfaces

    - by Amir Rachum
    I've used Java for some time and I keep hearing about interfaces such as Cloneable, Iterable and other X-ables. I was wondering if there is a list somewhere of all of these and more importantly - which ones do you regularly use day-to-day? For example, I've read that Cloneable is considered badly written and isn't widely used.

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  • k-combinations of a set of integers in ascending size order

    - by Adamski
    Programming challenge: Given a set of integers [1, 2, 3, 4, 5] I would like to generate all possible k-combinations in ascending size order in Java; e.g. [1], [2], [3], [4], [5], [1, 2], [1, 3] ... [1, 2, 3, 4, 5] It is fairly easy to produce a recursive solution that generates all combinations and then sort them afterwards but I imagine there's a more efficient way that removes the need for the additional sort.

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  • How does Eclipse/IDEA/etc. debugger obtain the information about local variable values and watch exp

    - by Bubba88
    I always thought that varibales are mapped to stack locations once your Java source is compiled; additionally, they may include the info about the variable names and their scope in classfiles, but that's optional AFAIK. The question is - how do my Eclipse/IDEA IDEs allow me to set a watch expression containing the local variable name? To me, it's hard to understand :)

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  • Conditional operator in if-statement?

    - by Pindatjuh
    I've written the following if-statement in Java: if(methodName.equals("set" + this.name) || isBoolean() ? methodName.equals("is" + this.name) : methodName.equals("get" + this.name)) { ... } Is this a good practice to write such expressions in if, to separate state from condition? And can this expression be simplified?

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  • How do I format a String in an email so Outlook will print the line breaks?

    - by MattGrommes
    I'm trying to send an email in Java but when I read the body of the email in Outlook, it's gotten rid of all my linebreaks. I'm putting \n at the ends of the lines but is there something special I need to do other than that? The receivers are always going to be using Outlook. I found a page on microsoft.com that says there's a 'Remove line breaks' "feature" in Outlook so does this mean there's no solution to get around that other than un-checking that setting? Thanks

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  • NamespaceContext and using namespaces with XPath

    - by Jherico
    Resolving an xpath that includes namepsaces in Java appears to require the use of a NamespaceContext object, mapping prefixes to namespace urls and vice versa. But I can find no mechanism for getting a NamespaceContext other than implementing it myself. This seems counter-intuitive. Is there any easy way to acquire a NamespaceContext from a document, or to create one, or failing that, to forgo prefixes altogether and specify the xpath with fully qualified names?

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  • What is Dispatcher Servlet in Spring?

    - by theband
    http://maestric.com/wiki/lib/exe/fetch.php?w=&h=&cache=cache&media=java:spring:spring_mvc.png In the above image, HTTP request sends something to Dispatcher Servlet. My Question is what does Dispatcher Servlet do. Is it something like getting the information thrown from the web page and throwing it to the controller.

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  • assigning a specific record in a ResultSet to a variable

    - by kilhra
    Hi I want to retrieve a set of records from a database, do a rs.next() and then assign the result of this to a variable to pass to a method that will use this record, in the same way that I would without assigning it to a variable and passing it to a method is there any way to do this? I'm using JAVA (1.5)

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