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  • What is causing Null Pointer Exception in the following code in java? [migrated]

    - by Joe
    When I run the following code I get Null Pointer Exception. I cannot figure out why that is happening. Need Help. public class LinkedList<T> { private Link head = null; private int length = 0; public T get(int index) { return find(index).item; } public void set(int index, T item) { find(index).item = item; } public int length() { return length; } public void add(T item) { Link<T> ptr = head; if (ptr == null) { // empty list so append to head head = new Link<T>(item); } else { // non-empty list, so locate last link while (ptr.next != null) { ptr = ptr.next; } ptr.next = new Link<T>(item); } length++; // update length cache } // traverse list looking for link at index private Link<T> find(int index) { Link<T> ptr = head; int i = 0; while (i++ != index) { if(ptr!=null) { ptr = ptr.next; } } return ptr; } private static class Link<S> { public S item; public Link<S> next; public Link(S item) { this.item = item; } } public static void main(String[] args) { new LinkedList<String>().get(1); } }

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  • Unable to connect to CopSSH when running Windows service, works when running sshd directly

    - by Joe Enos
    I've been using CopSSH (that uses OpenSSH and Cygwin, so I don't know which of the three is the problem) as my SSH server application at home on Windows 7 Ultimate 32 bit. I have used it for about a year with no real problems, other than it sometimes takes 2 or 3 connection attempts to get through, but it's always worked within a few attempts. A few days ago, it just stopped working. The Windows service is still running, and I've rebooted, restarted the service, etc. with no change. On the client (using Putty on Windows), I get the message "Software caused connection abort". On the server, my event viewer registers the following: fatal: Write failed: Socket operation on non-socket I finally got it working, but only by executing sshd.exe directly from the command line on the server. No special flags or options, just straight execution, and then when I connect remotely, it goes through. I do have firewall and anti-virus software which appears to be configured properly, but the fact that things work when running sshd.exe also indicates that the firewall is fine. I thought the service and executable did exactly the same thing, but apparently there's some difference. Does anyone have any ideas on where I should look for the problem? If I can't find something, I suppose I can write a Windows service or scheduled task that fires off sshd.exe directly and ensures that it stays running, but that's kind of a last resort, since it's just wrapping around something that should already work. I appreciate your help.

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  • how to think like a computer scientist java edition exercise 7.2 [on hold]

    - by James Canfield
    I cannot figure out how to write this program, can someone please help me?! The purpose of this method is to practice manipulating St rings. Create a new program called Name.java. This program will take a name string consisting of EITHER a first name followed by a last name (nonstandar d format) or a last name followed by a comma then a first name (standard format). Ie . “Joe Smith” vs. “Smith, Joe”. This program will convert the string to standard format if it is not already in standard format. Write a method called hasComma that takes a name as an argument and that returns a boolean indicating whether it contains a comma. If i t does, you can assume that it is in last name first format. You can use the indexOf String m ethod to help you. Write a method called convertName that takes a name as an argument. It should check whether it contains a comma by calling your hasComma method. If it does, it should just return the string. If not, then it should assume th at the name is in first name first format, and it should return a new string that contains the name converted to last name comma first format. Uses charAt, length, substring, and indexOf methods. In your main program, loop, asking the user for a n ame string. If the string is not blank, call convertName and print the results. The loop terminat es when the string is blank. HINTS/SUGGESTIONS: Use the charAt, length, substring, and indexOf Str ing methods. Use scanner for your input. To get the full line, complete with spaces, use reader.nextLine()

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  • What is the difference between these two find algorithms? [migrated]

    - by Joe
    I have these two find algorithm which look the same to me. Can anyone help me out why they are actually different? Find ( x ) : if x.parent = x then return x else return Find ( x.parent ) vs Find ( x ) : if x.parent = x then return x else x.parent <- Find(x.parent) return x.parent I interpret the first one as int i = 0; return i++; while the second one as int i = 0; int tmp = i++; return tmp which are exactly the same to me.

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  • Virtualize Mac OS X on a Mac

    - by Joe Mako
    I use Virtual Box on a Mac OS X 10.6.2 MacBook Pro. Can I create/run a Mac OS X 10.5 guest OS on this setup? If not, what setup would allow me to run multiple versions of Mac OS X on the same machine?

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  • Oracle and Deloitte Consulting - Governance, Risk and Compliance

    Lee Dittmar, principal with Deloitte Consulting's Enterprise Governance practice; Folia Grace, Oracle's Vice President of ERP and CPM Applications Marketing; and Lane Leskela, Oracle's Senior Product Marketing Director for Governance, Risk and Compliance Applications talk with Fred about the technology issues organizations are facing around governance, risk and compliance (GRC) and Deloitte's and Oracle's approach to helping organizations achieve and sustain GRC.

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  • What folders to encrypt with EFS on Windows 7 laptop?

    - by Joe Schmoe
    Since I've been using my laptop more as a laptop recently (carrying it around) I am now evaluating my strategy to protect confidential information in case it is stolen. Keep in mind that my laptop is 6 years old (Lenovo T61 with 8 GB or RAM, 2GHz dual core CPU). It runs Windows 7 fine but it is no speedy demon. It doesn't support AES instruction set. I've been using TrueCrypt volume mounted on demand for really important stuff like financial statements forever. Nothing else is encrypted. I just finished my evaluation of EFS, Bitlocker and took a closer look at TrueCrypt again. I've come to conclusion that boot partition encryption via Bitlocker or TrueCrypt is not worth the hassle. I may decide in the future to use Bitlocker or TrueCrypt to encrypt one of the data volumes but at this point I intend to use EFS to encrypt parts of my hard drive that contain data that I wouldn't want exposed. The purpose of this post is to get your feedback about what folders should be encrypted from the general point of view (of course everyone will have something specific in addition) Here is what I thought of so far (will update if I think of something else): 1) AppData\Local\Microsoft\Outlook - Outlook files 2) AppData\Local\Thunderbird\Profiles and AppData\Roaming\Thunderbird\Profiles- Thunderbird profiles, not sure yet where exactly data is stored. 3) AppData\Roaming\Mozilla\Firefox\Profiles\djdsakdjh.default\bookmarkbackups - Firefox bookmark backup. Is there a separate location for "main" Firefox bookmark file? I haven't figured it out yet. 4) Bookmarks for Chrome (don't know where it's bookmarks are) and Internet Explorer ($Username\Favorites) - I don't really use them but why not to secure that as well. 5) Downloads\, My Documents\ and My Pictures\ folders I don't think I need to encrypt, say, latest service pack for Visual Studio. So I will probably create subfolder called "Secure" in all of these folders and set it to "Encrypted". Anything sensitive I will save in this folder. Any other suggestions? Again, this is from the point of view of your "regular office user".

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  • Can I make Gimp 2.8.4 in OSx make the file I just opened be the top window automatically?

    - by joe larson
    When I open an image file in Gimp 2.8.4 in OSx Mountain Lion 10.8.4 via the File Open menu, it does not automatically make that image the top window, requiring that I then find that window via the Window menu. Very jarring UX! Is there a way to modify this behavior so that it behaves like most GUI applications and brings the document just opened to the fore? Is this a bug in Gimp 2.8? Interestingly in my Ubuntu 12.04 with Gimp 2.6.12 this is not a problem. Since I haven't used Gimp much at all until this month, I don't know if this is a new problem or not.

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  • Double Filter in Excel

    - by Joe
    I'm trying to "stack" filters in excel, so to speak. I want to filter column A to show anything greater than 30 and then I want to filter column B to show the top ten items. When I do this, however, it shows me all rows that fit both criteria (only five records). I want to first fit the criteria for column A and then filter these results to show the top ten items in column B (10 records total). I know that I could just copy the rows from my first filter to a new sheet and then filter the new worksheet, but is there any way to apply both filters so that I don't physically have to delete records this way? Thanks for your help!

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  • NFSv3 Asynchronous Write Depends on Block Size?

    - by Joe Swanson
    I am trying to figure out if my NFSv3 deployment is performing SAFE asynchronous writes. I suspect that it is doing strictly synchronous writes, as I am getting poor performance in general. I used Wireshark to look at the 'stable' flag in write calls, and look for 'commit' calls. I noticed that, with especially large block sizes, writes to appear to be performed asynchronously: dd if=/dev/zero of=/proj/re3/0/zero bs=2097152 count=512 However, smaller block sizes appear to be performed strictly synchronously: dd if=/dev/zero of=/proj/re3/0/zero bs=8192 count=655360 What gives? How does the client decide whether to tell the server to perform writes synchronously or asynchronously? Is there any way I can get smaller block sizes to be performed asynchronously?

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  • Qmail: relay only from selected servers based on rDNS

    - by Frank
    I'm looking for a way to disable Qmail relaying for everyone, but allow one certain group of hosts to do so. These hosts all use the same identifying rDNS entry. In Exchange 2003, Postfix, Exim and cPanel this can be achieved pretty easily. However, the only to do this with Qmail is to do this based on IP's. The IP's however tend to change. These changes can occur at any time, and it is impossible to keep all the servers up-to-date to the new IP's. Running a script that resolves the hostname and whitelists them accordingly is my last-resort option, but this is not fool-proof. Does anyone know whether this is possible and if so, how? Thanks!

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  • Amazon RDS Pros/Cons of Multiple DBs per instance

    - by Joe Flowers
    I run two completely independent websites. I am moving their MySQL databases to Amazon RDS. I'm not going to do Multi A/Z deployment - let's remove that variable from this question. I'm not sure whether to create a single RDS instance with two databases, or two Amazon RDS instances with a single database. Ignore cost for the sake of this question. I will not hit the 1 TB data limit so let's ignore that. However, it is extremely important that crashing one of the websites doesn't impact the other. Based on this document - http://docs.amazonwebservices.com/AmazonRDS/latest/UserGuide/Concepts.DBInstance.html I'm assuming that if I write terrible code that crashes one of the databases in a given RDS instance, it could possibly take down the entire RDS instance (and thus inadvertantly affect the other database). Is that correct? Thanks

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  • An easily customizable linux distribution using minimal disk space?

    - by Frank
    I'm looking for a linux distribution that can be easily used to create my own distribution that's the same system with some software installed. So basically I should be able to create an iso which, when installed, will have the linux distribution with my desired installed. More specifically, I plan on installing mysql and a bit of my own software which shouldn't be too big. However, this distribution needs to be extremely small in terms of disk space. The distribution, including mysql should not exceed 100mb. It should, of course still be able to connect to the internet and perform other standard functions. I don't need X/any sort of window manager, and would prefer not to have it since it would increase disk usage. Currently I have tried ttylinux and tiny core linux. I've found that ttylinux, while is extremely small, has almost nothing so that mysql can't even be installed. Tiny core linux, on the other hand is a bit too big. I've found openembedded and linux from scratch, but I would prefer for the install and build process to be much easier. What other distribution would you recommend for my purposes? Minimizing disk usage is the most important, followed by ease of installing and creating the custom distribution.

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  • How much of slow and fast flash memory a "flash memory" have? [migrated]

    - by gsc-frank
    Trying to know what is the best of my flash memories to use ReadyBoost I realize that I don't know how much of fast flash memory each of my flash drives have. One can read: In some situations, you might not be able to use all of the memory on your device to speed up your computer. For example, some flash memory devices contain both slow and fast flash memory, but ReadyBoost can only use fast flash memory to speed up your computer. From http://windows.microsoft.com/is-IS/windows7/Using-memory-in-your-storage-device-to-speed-up-your-computer

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  • Correlating %RDY in esxtop to CPU Usage in Guest

    - by Joe
    We recently upgrade a number of our VmWare hosts from 4.1 to 5.5 and noticed many of the VMs saw a step-wise jump in CPU usage as shown by the guest VM. We have not yet upgraded vmwaretools on any of the guests, but after investigating a bit more we saw many of these guests with a high %RDY value (50%) when viewed under esxtop. Unfortunately Linux (the guest) just shows "high CPU usage" without any insight into what portion of that is coming from %RDY (VmWare saying, "your guest is waiting on CPU from the host"). Are there any tools, /proc entries, etc. that can shed light on that information?

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  • Outsourcing Web Development ? Benefits and Risks

    Outsourcing of web development is a trend that has caught up in recent times. Originally people were skeptical in sending work abroad, but now-a-days it is a modern day boon. It can be a huge cost sa... [Author: Dawn Lee - Web Design and Development - April 10, 2010]

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  • USB ports not recognizing devices (vista)

    - by frank
    I'm trying to fix a problem on a Vista machine where all the USB ports seem to have power but they don't recognize devices plugged into them. It seemed to start after I plugged my mp3 player (sansa clip) into it and disconnect it. So it sounds similar to this article http://support.microsoft.com/kb/817900 but that was for XP. And I did try all the fixes (including the registry entry) but they did not help. It also sounds similar to this SU question 50110 but I don't think it is the mother board. I have see other places that suggest reinstalling the OS...but that seems like a last resort type of thing. I have also seen a suggestion of doing a system restore but not sure if that will help. Any ideas of what I can try?

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  • How do I share a Quick Style Set I have created?

    - by Frank Conte
    I have created a Quick Style Set in Word 2010 that I would like to share with colleagues. I have called this QSS OurReport. Another web site suggested the following For Windows 7, the folder should be Users[username]\AppData\Roaming\Microsoft\QuickStyles. Open Word File options advanced Scroll all the way down to section titled “General” Click “File locations” Click “User templates” – this will bring you to templates but also quick styles folder I have no Quick Styles Folder in my Roaming file locations

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  • Have a Microsoft Exchange and Google Apps Email Running on the Same Domain

    - by Joe Sampson
    A company that I work for just acquired another company that was using Google Apps for it's email. We use Microsoft Outlook Exchange. The founders of the company (who are leaving) want to maintain a few email addresses on Google Apps for them to use over the next year. Does anyone know if it's possible to have just a few Google Apps email addresses working on a domain and the rest of the domain running on Outlook Exchange?

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  • Subversion Edge LDAP (require CAC Certificate not Username and Password)

    - by Frank Hale
    What I've Done: I've successfully installed and configured Subversion Edge 3.1.2 with LDAP support on a Windows 2008 server. I have configured LDAP users and am able to use LDAP credentials to work on repositories just fine. No issues whatsoever. Works great! What I Want To Do: I've been searching for several hours now in hopes to find some information on how to configure Subversion Edge server to require client certificates for user authentication against an LDAP environment. I have not found anything yet that gives me an indication of how to do it. I know there are SVN clients that are capable of prompting for CAC certificates but I cannot figure out how to set my server up to require it. NOTE: CAC authentication is already setup and working in the windows environment. Desired Outcome: When running svn commands that require authentication against my Subversion Edge Server I want it to prompt me for my CAC certificate instead of my Active Directory username and password. If anyone has any information on this I'd greatly appreciate it. EDIT: I'm still digging so if I find out anything I'll update this question with what I found.

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