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• Program not running from expected directory?

  - by twpc

  I am working on a web-based program, using Java. I am not sure exactly how to phrase this, but I expect the program to be running from within the c:/Resin/webapps/apps directory. However, when I reference a file in the program like this: "../files/randomfile.pdf", it cannot find that file. It works when I reference it like this: "c:/Resin/webapps/files/randomfile.pdf". How to I change the "running location"? (And what is the technical term for this?)

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• Ways to wrap 32-bit .dll so it will work in a 64-bit OS

  - by dcarlet101

  So, I've been using JPIB to communicate with GPIB devices in my java program. However, I have run into a snag. Newer systems are built on 64 bit OS's. However, the jpib.dll file is written in 32-bit. I can't think of any kind of calls that it would need to make that are truly 64-bit dependent. The real trouble here is that the JPIB project hasn't been updated since september of 2006. I've tried emailing the dev through SourceForge but I don't think I'll get anywhere with that. Does anyone know of any ways around this? Or know how (and could tell me how) to recompile the .dll into AMD-64 compliance?

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• Count The Amount Of Data In An Array Including SOME Null

  - by Josephine

  I'm coding in java and I need to create a function that returns the number of Data objects that are currently in an ArrayList. At the moment I have this: int count = 0; for (int i = 0; i < data.length; i++) { if (data[i] != null) { count ++; } } return count; But the problem is that an array list that includes null data is acceptable, and I have to count their null data towards this counter. How do I include the null data that's in the middle of this array, and not the null data that's not supposed to be counted for? For example, I have some tester code that adds (8),null,null,(23),(25) to the array, and this function should return 5 when the initial array size is 10. Thank you so much

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• Generate service layer with Hibernate

  - by gmate

  Hi all! I generate *.hbm.xml mapping files and *.java file from the DB schema, with Hibernate tools. My question is, that is there any option, to generate service classes also? These are the classes where I implement the store(), find(), delete(), etc... methods. I know that for C# there are many solutions to generate almost everything. I'm looking for the same, but with Hibernate. Is there any? Thanks for every reply in advance!

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• Hibernate criterion Projection alias not being used

  - by sbzoom

  Do Hibernate Projection aliases even work? I could swear it just doesn't. At least, it doesn't do what I would expect it to do. Here is the java: return sessionFactory.getCurrentSession().createCriteria( PersonProgramActivity.class ).setProjection( Projections.projectionList().add( Projections.alias( Projections.sum( "numberOfPoints" ), "number_of_points" ) ).add( Projections.groupProperty( "person.id" ) ) ).setFirstResult( start ).setFetchSize( size ).addOrder( Order.desc( "numberOfPoints" ) ).list(); Here is the SQL that it generates: select sum(this_.number_of_points) as y0_, this_.person_id as y1_ from PERSON_PROGRAM_ACTIVITY this_ group by this_.person_id order by this_.number_of_points desc It doesn't seem to use the alias at all. I would think setting the alias would mean that "sum(this_.number_of_points)" would be aliased as "number_of_points" and not "y0_". Is there some trick I am missing? Thanks.

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• Reference to fnc.

  - by atch

  Hi guys, Is there a way in java to do something like this: void fnc(void Reference_to_other_func()); What I'm trying is basically I have number of places where I need to display this same text to the user and the only difference is which method is invoked after this text. So for example instead of writing: System.out.println("Hello"); f1(); //in some other place System.out.println("Hello"); f2(); //etc I would like to define one function: public void f(void Reference_to_other_func()) { System.out.println("Hello"); Reference_to_other_func();//HERE I'M INVOKING } and then instead of repeating this whole code I could write something like this: f(f1); //in some other place f(f2) //etc. Thanks for answers

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• String as \x03\x00\x00\x00 to integer

  - by marta

  Helo: I have a question, that I solved in c, but now I want to do it in hava: I have a String like: '\x03\x00\x00\x00' This is representing an hexadecimal value of a integer. I transform to 0x03\0x00... And now I want to obtain the integer, but I don't know how to do it in java could someone give me some idea ? Thanks in advance (Is it some way to use this format ('\x03\x00\x00\x00' ) directly without use byte[] arrays? and in C can I use this format directly to build a integer (int)?)

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• Hibernate + Spring + session + cache

  - by andromeda

  We are using Hibernate with Spring for our Java application. We find out that when a session update something in database other sessions can not see the update. For example user1 get the account balance from database then user2 increase the balance , if user1 get the object another time he see the account balance before updating (seems that session use the value from its cache) but we want to get the updated object with new account balance. User1 use one session during all activity that is different from user2 session. Is any configuration to force to get the updated object from database? or any other help?

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• Integrate existing Spring based web application with a CMS

  - by anne_developer

  We have stable spring based (spring 2.x) web application. We have a new requirement which is our data entry operators should be able to login to some kind of an admin module and simply change the text in the web pages, change the color etc. I have seen PHP based CMS’s that allows authorized user to change the content in WYSIWYG manner. If anyone of you knows such open source Java CMS or third party application, which can facilitate such thing, please let me know. Please note: we cannot write our application from scratch. We are looking for pluggable component.

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• Algorithm for finding all paths in a NxN grid

  - by Periastron

  Imagine a robot sitting on the upper left hand corner of an NxN grid. The robot can only move in two directions: right and down. How many possible paths are there for the robot? I could find solution to this problem on Google, but I am not very clear with the explanations. I am trying to clearly understand the logic on how to solve this and implement in Java. Any help is appreciated. Update: This is an interview question. For now, I am trying to reach the bottom-right end and print the possible paths.

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• Retrieving images when database is in remote location...

  - by sasidhar

  Hi everyone, I am developing an application using java, my application would be accessed by number of different users simultaneously and the database resides in a central server. The access of the database from remote server is handled by just giving the appropriate IP of the server in the hibernate configure file. My question is, i have to store a picture regarding each user of the database, i heard that storing the image in the database and retrieving it from the database is not advised and has negative impact on the performance. Is it so ? What are the other possible ways i can implement this ? What is the best way to do it..? Please help....

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• JButtons don't imediatly change on mouse event

  - by out_sider

  I'm using the java swing library to develop a board game called DAO. The problem is that after the human player makes its move, by clicking on the JButton with the piece image that he wants to play, I call the computer AI routine but inside the mouse event function. By doing this only when the function returns, the computer ends its turn, do the JButtons refresh their Images (setIcon comes in). I'd like to know how can I force the JButtons to change their image at the moment they are clicked and not only when the mouse event function ends (as I need to handle data inside it). I've tried all of this myButtons[i][j].setIcon(xIcon); myButtons[i][j].revalidate(); myButtons[i][j].repaint(); myButtons[i][j].validate(); None worked. Thx in advance

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• Strings - Filling In Leading Zeros Wtih A Zero

  - by headscratch

  I'm reading an array of hard-coded strings of numeric characters - all positions are filled with a character, even for the leading zeros. Thus, can confidently parse it using substring(start, end) to convert to numeric. Example: "0123 0456 0789" However, a string coming from a database does not fill in the leading zero with a 'zero character', it simply fetches the '123 456 789', which is correct for an arithmetic number but not for my needs and makes for parsing trouble. Before writing conditionals to check for leading zeros and adding them to the string if needed, is there a simple way of specifying they be filled with a character ? I'm not finding this in my Java book... I could have done the three conditionals in the time it took to post this but, this is more about 'education'... Thanks

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• Mercurial - Files nog showing on server (ls command)

  - by Bumbolt

  I'm trying to setup a java buildserver with jenkins,maven and mercurial. Now my mercurial server is working i can push, pull and commit. Running the command 'hg serve' on the server allows me to see commits from my clients. But when i go manually into the repository (cd in server-terminal) and do an 'ls' command i can't see any file. When i clone the repository onto a new client i DO recieve the files pushed by the other clients. This is somewhat strange behaviour. Does anyone recognize this? What should i do to fix this?

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• How to update mutual entries in DB?

  - by Sthita

  I am not able to perform mutual update to my Database. My Requirement is like this : Insert IDS UPDate DB Entries ID ConnectedTo ID connectedTo connectedVia 2 1 --- No Entry ----- 2 3 -- No Entry ----- When ID 1 Comes in to picture (Enties happened to Table) 1 4 1 3 2 1 5 2 4 1 1 2 2 5 1 When ID 3 Comes into picture (Enties happened to Table) 3 4 3 5 1 3 1 ---- 3 2 ---- Similarly when ID 4 Comes in to picture 4 9 4 2 3 4 10 4 5 1 4 3 4 2 1 4 1 1 9 4 1 10 4 Its basically Updating the mutual connections.No Duplicate entries should happen. Like for example 2 3 and 3 2 are mutually connected and 1 is associated with them so there is no need to insert (3 2 via 1). I think this is my requirement. Anything possible combinations i have missed please let me know. i will Update. Please help me writing the logic or any example using jdbc and java.

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• Send data over telnet without pressing enter

  - by Matt

  I've recently started messing around with Java sockets and telnet... I want the user to be able to connect to the server, just type a letter and have it sent to the server, without pressing enter to send it. I'm sure there's no way for the server to set this up, but maybe telnet has a parameter or something which could allow this? Maybe if I got the user to type stty cbreak or stty raw before running telnet, this would work? (UNIX only, I know!) If I can get telnet to do this then it saves me having to write a special client just for this feature...

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• Problems to make programming more interesting for school students [closed]

  - by Jomoos

  I have to teach Java programming to school students and all are around the age of 15. None of them had any previous experience in programming. That is, I have to start from the very basics. I do like to make the sessions more interesting, and to make them love programming. I do need simple problems or puzzles -- not complex ones, simple ones -- that can increase their curiosity, and made them think and love programming. I do like to have problems for all of the concepts (like branching, looping, encapsulation, inheritance, composition, etc.,). Notes: I do have a time-frame of 1 hour for each session. Computers are not available. Maybe I can bring my laptop and show a demo to them. There are 7 students in the class.

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• HashMap "WriteOnce" Implementation .. need help

  - by JavaNewbie

  import java.util.*; public class HashMapExample { public static class WriteOnceMap<K, V> extends HashMap<K, V> { public V put(K key, V value) { /* WriteOnceMap is a map that does not allow changing value for a particular key. It means that put() method should throw IllegalArgumentException if the key is already assosiated with some value in the map. Please implement this method to conform to the above description of WriteOnceMap. */ } public void putAll(Map<? extends K, ? extends V> m) { /* Pleaase implement this method to conform to the description of WriteOnceMap above. It should either (1) copy all of the mappings from the specified map to this map or (2) throw IllegalArgumentException and leave this map intact if the parameter already contains some keys from this map. */ } } }

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• Create tables for a dictionary?

  - by heffaklump

  I'm making a dictionary database in SQLite and need some tips. My SQL is a bit rusty ;) Would you consider this good SQL? It's done with Java JDBC. This is for creating the tables. CREATE TABLE word ( id INTEGER, entry STRING, pos STRING ); CREATE TABLE translation ( word_id INTEGER REFERENCES word(id), entry STRING ); And when filling with data i give each word a number (id) and that words translations get the same number as word_id. What would be the best way of pulling out translations for a specific word?

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• Interview Q: given an array of numbers, return array of products of all other numbers (no division)

  - by polygenelubricants

  I was asked this question in a job interview, and I'd like to know how others would solve it. I'm most comfortable with Java, but solutions in other languages are welcome. Given an array of numbers, nums, return an array of numbers products, where products[i] is the product of all nums[j], j != i. Input : [1, 2, 3, 4, 5] Output: [(2*3*4*5), (1*3*4*5), (1*2*4*5), (1*2*3*5), (1*2*3*4)] = [120, 60, 40, 30, 24] You must do this in O(N) without using division.

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• How to convert string to integer?

  - by user1260584

  So I'm having a hard time with my situation and need some advice. I'm trying to convert my two Strings that I have into integers, so that I can use them in math equations. Here is what I tried, however it brings me an error in the app. ' equals.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub num1 = edit.getText().toString(); num2 = edit.getText().toString(); int first = Integer.parseInt(num1); int second = Integer.parseInt(num2); edit.setText(first + second); } }); Is there something that I am doing wrong? Thank you for any help. EDIT: Yes this is Java. num1 and num2 are strings that I have previously named. What do you mean by trim?

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• date comparison inside a list returned

  - by rob

  I have a ArrayList returned from a service which contains date-timestamp as String values (with values: 2010-05-06T23:38:18,2010-05-06T23:32:52,2010-04-28T18:23:06,2010-04-27T20:34:02,2010-04-27T20:37:02) to be more specific, This is part of a parent ArrayList ObjectHistory. This list contains the datestamp and serial number. I need to pick the correct serial number. Objecthistory is the List object and I need to get the latest timestamp within this ObjectHistory. I need to pick the latest timestamp from this Arraylist in Java 6. How should I be doing this? Should I do convert these values into calendar-time? I am in panic mode as this has to be done directly in production.

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• Vim plugin only works when file is provided as arg to launch command

  - by nsfyn55

  I am using the plugin java_getset.vim. The issue is that the plugin's commands are only available when I launch vim with the file as an argument. user@machine~: vim myfile.java If launch vim and use command-t or NerdTree to open the file in a buffer the plugin's commands are not accessible. All the filetype detection stuff is configured and working(I have syntax highlighting and indentation). The plugin source appears to be written to the letter according the the vim docs for a filetype plugin. Can anyone help me understand what changes a can make so that I can use this plugin in conjunction with Command-t?

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• How to transfer large file (File size > Heap Size) over the network?

  - by neo

  How to transfer large file (File size Heap/RAM Size) over the network ? Lets say I have file (size 10GB) I want to transfer it machine a (RAM 512mb) to machine b (RAM 512mb). Want achieve this using java code. First, is it possible ? Any recommendation on framework. If possible, can we speed this up using threading ? Important criteria: file's data sequence needs to be maintained during transfer. Any example will be great help.

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• How to change the text int JLabel under the while or for loop?

  - by guilgamos

  I want to create a simple clock by using java. The code is very simply that i will give an example shown below for(int i=0;i<=60;i++) jLabel11.setText( Integer.toString(i) ); The problem is while I'm running my program the result didn't show the update in sequence. I mean it show only 60 digit immediately. It didn't show the change from 1 to 2 to 3 ... something like this. How can i fix this problem. Thank you in advance.

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