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  • Any recommended java profiling tutorial?

    - by Wing C. Chen
    Is there any recommended java application profiling tutorial? I am now using jProfiler and eclipse TPTP with my profiling. However, although equipped with wonderful weapons, as a newbie in java profiling, I am still missing the general theory and skill in pinpointing the bottleneck. So would you please provide me with some recommended tutorial for java profiling?

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  • actionscript swf: why the swf is cached in one web server

    - by Bin Chen
    Hi, I have one swf and a program to load this swf. The swf is put in a server. I encounter a weird problem that if I put this swf in serverA, each time my program will issue a http request to that webserver(with 304 response). But when I move the swf from serverA to serverB, some weird things happen, the progrom will only issue the first time http request, and after that, it didn't send any http request, it looks like it uses the cache in the disk. I wonder is how can I configure serverA make the behavior the same as serverB, as I guess the problem may exists in the http response that make the program not retrieving the swf from serverB any more. Bin

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  • reStructuredText tool support

    - by Chen Levy
    I love reStructuredText, however the tools that support it are scattered all over the Internet. The official tool list is incomplete and/or outdated, and can be updated only via commit privileges. For some time there was a comprehensive list at the Wikipedia reStructuredText page, but this apparently "may not meet the notability guideline for web content" and is scheduled for removal. So to put it in a question form: What tool support can one expect to find when working with reStructuredText, e.g. text editors, Wiki software, converters to and from reStructuredText etc.?

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  • Spring MVC - Cannot map request parameters as a Map parameter in method?

    - by Ken Chen
    What I want to do is passing a map to the method in Controller using @RequestParam, but it seems not working. While this is working in Struts 2. Below is what I am trying: In JSP using JQuery: var order = {}; order['seq'] = "ASC"; var criteria = {}; criteria['label'] = "Directory"; $.post(context + 'menu/list', {"orders" : order, "criterias" : criteria} The parameters I am trying to post is an 'map' object order and criteria for listing menu. In Java: @RequestMapping("/{collection}/list") public @ResponseBody Map<String, ? extends Object> list(@PathVariable String collection, @RequestParam("criterias") Map<String, String> criteria, @RequestParam("orders") Map<String, String> order) { However, when I print out the map criteria & order in Java, it takes all value as below: Criteria: {criterias[label]=Directory, orders[seq]=ASC} Order: {criterias[label]=Directory, orders[seq]=ASC} Can @RequestParam in Spring be used to init a Map parameter?

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  • How to compile and build C# projects with Ant and Mono?

    - by Wing C. Chen
    I am currently working on a project with both java and C# codes within. Java takes the major role in this project. However, C# still takes a small part in it. I am using Ant to build the projects, and would very much like to use it to build C# too. I have learned that it's possible to build C# under Ant with the help of Mono. Can anybody provide any link of tutorial or guidance here? I was trying to google for it. But I haven't found any comprehensive data.

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  • android: using listpreference and retrieving key string...

    - by Allan
    I have a settings menu that pops up and in it is a listpreference type menu. It is associated with a settings.xml file where there are 'array-strings' within it. It all works good but I don't know how to retrieve the users preference. As an example, let's say the user picks a color (red, green, or blue). The list that I've made within my 'array-strings' contain the text red, green, and blue. Within my code, I would like to do something if the user has choosen red, something else if they choose blue, etc., etc. Would I use a 'case' statement or an 'if' statement? And most importantly, how would I retrieve the users preference - the key? (am I checking for a boolean?) Help would be appreciated...thank you...

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  • GlassFish Security Realm, Active Directory and Referral

    - by Allan Lykke Christensen
    I've setup up a Security Realm in Glassfish to authenticate against an Active Directory server. The configuration of the realm is as follows: Class Name: com.sun.enterprise.security.auth.realm.ldap.LDAPRealm JAAS context: ldapRealm Directory: ldap://172.16.76.10:389/ Base DN: dc=smallbusiness,dc=local search-filter: (&(objectClass=user)(sAMAccountName=%s)) group-search-filter: (&(objectClass=group)(member=%d)) search-bind-dn: cN=Administrator,CN=Users,dc=smallbusiness,dc=local search-bind-password: abcd1234! The realm is functional and I can log-in, but when ever I log in I get the following error in the log: SEC1106: Error during LDAP search with filter [(&(objectClass=group)(member=CN=Administrator,CN=Users,dc=smallbusiness,dc=local))]. SEC1000: Caught exception. javax.naming.PartialResultException: Unprocessed Continuation Reference(s); remaining name 'dc=smallbusiness,dc=local' at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2820) .... .... ldaplm.searcherror While searching for a solution I found that it was recommended to add java.naming.referral=follow to the properties of the realm. However, after I add this it takes 20 minutes for GlassFish to authenticate against Active Directory. I suspect it is a DNS problem on the Active Directory server. The Active Directory server is a vanilla Windows Server 2003 setup in a Virtual Machine. Any help/recommendation is highly appreciated!

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  • Java "constant string too long" compile error. Only happens using Ant, not when using Eclipse

    - by Allan
    I have a few really long strings in one class for initializing user information. When I compile in Eclipse, I don't get any errors or warnings, and the resulting .jar runs fine. Recently, I decided to create an ant build file to use. Whenever I compile the same class with ant, I get the "constant string too long" compile error. I've tried a number of ways to set the java compiler executable in ant to make sure that I'm using the exact same version as in Eclipse. I'd rather figure out how to get the same successful compile I get in Eclipse in Ant than try to rework the code to dynamically concatenate the strings.

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  • Whats wrong with my triple DES wrapper??

    - by Chen Kinnrot
    it seems that my code adds 6 bytes to the result file after encrypt decrypt is called.. i tries it on a mkv file.. please help here is my code class TripleDESCryptoService : IEncryptor, IDecryptor { public void Encrypt(string inputFileName, string outputFileName, string key) { EncryptFile(inputFileName, outputFileName, key); } public void Decrypt(string inputFileName, string outputFileName, string key) { DecryptFile(inputFileName, outputFileName, key); } static void EncryptFile(string inputFileName, string outputFileName, string sKey) { var outFile = new FileStream(outputFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite); // The chryptographic service provider we're going to use var cryptoAlgorithm = new TripleDESCryptoServiceProvider(); SetKeys(cryptoAlgorithm, sKey); // This object links data streams to cryptographic values var cryptoStream = new CryptoStream(outFile, cryptoAlgorithm.CreateEncryptor(), CryptoStreamMode.Write); // This stream writer will write the new file var encryptionStream = new BinaryWriter(cryptoStream); // This stream reader will read the file to encrypt var inFile = new FileStream(inputFileName, FileMode.Open, FileAccess.Read); var readwe = new BinaryReader(inFile); // Loop through the file to encrypt, line by line var date = readwe.ReadBytes((int)readwe.BaseStream.Length); // Write to the encryption stream encryptionStream.Write(date); // Wrap things up inFile.Close(); encryptionStream.Flush(); encryptionStream.Close(); } private static void SetKeys(SymmetricAlgorithm algorithm, string key) { var keyAsBytes = Encoding.ASCII.GetBytes(key); algorithm.IV = keyAsBytes.Take(algorithm.IV.Length).ToArray(); algorithm.Key = keyAsBytes.Take(algorithm.Key.Length).ToArray(); } static void DecryptFile(string inputFilename, string outputFilename, string sKey) { // The encrypted file var inFile = File.OpenRead(inputFilename); // The decrypted file var outFile = new FileStream(outputFilename, FileMode.OpenOrCreate, FileAccess.ReadWrite); // Prepare the encryption algorithm and read the key from the key file var cryptAlgorithm = new TripleDESCryptoServiceProvider(); SetKeys(cryptAlgorithm, sKey); // The cryptographic stream takes in the encrypted file var encryptionStream = new CryptoStream(inFile, cryptAlgorithm.CreateDecryptor(), CryptoStreamMode.Read); // Write the new unecrypted file var cleanStreamReader = new BinaryReader(encryptionStream); var cleanStreamWriter = new BinaryWriter(outFile); cleanStreamWriter.Write(cleanStreamReader.ReadBytes((int)inFile.Length)); cleanStreamWriter.Close(); outFile.Close(); cleanStreamReader.Close(); } }

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  • Marshal generic return types for com interop

    - by Israel Chen
    Is it possible to Marshal a generic return type as non-generic for COM interop? Let's say I have the following class: [ComVisible(true)] public class Foo { public IEnumerable GetStr() // Generic return type { yield break; } } I know that IEnumerable implements IEnumerable. Can I force tlbexp.exe (via return: attribute or some other way) to expose GetStr() method as a method returning IEnumerbale?

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  • Where is my validator?

    - by Danny Chen
    I have a validator in my page: <asp:RequiredFieldValidator ID="rfv1" runat="server" ControlToValidate="IdentifySEDSED1TxtDate" ErrorMessage="Significant Event Date 1 is missing" ValidType="SEDate">*</asp:RequiredFieldValidator> I found that in Page_Load: (below is a screen shot from the Watch Window) this.FindControl("rfv1") {Text = "*"} rfv1 The name 'rfv1' does not exist in the current context See, I can get this control with FindControl, but I can't get it using ID directly! What happens?

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  • API for parse/update UNIX configuration files

    - by Chen Levy
    Unix configuration files come in all shapes and forms. I know that Webmin has a Perl API that makes it easy to parse and modify most common configuration pro grammatically, while preserving changes that might have been made by hand. Are there any other libraries that has similar functionality, perhaps for other languages (Python, Ruby, C, C++, etc)?

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  • Eclipse crashes during SVN merges

    - by Wing C. Chen
    I am currently using Eclipse Version: 3.5.1. It works perfectly in normal conditions, even with the SVN plugin, the faulty component that I am about to talk about now. The thing is that whenever I am conducting a merge, eclipse shuts down. It just crashes without even leaving an error message or anything else. It happens too often so that I can hardly normally. I am now using RapidSVN for merges. However, I would still like to know if there is any way to improve my eclipse condition.

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  • How to exclude series in legend (Flex)

    - by Sean Chen
    Hello, In flex charting, I want to draw something like "reference lines" which are related to specific series, therefore these lines are not independent series and should not be shown in legend. Is it possible to exclude some series from chart legend? Thanks!

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  • ServerAlias www.example.com is not recognized

    - by Tianzhou Chen
    Below is my config file: NameVirtualHost 12.34.56.78:80 < VirtualHost 12.34.56.78:80 ServerAdmin [email protected] ServerName domain1.com ServerAlias www.domain1.com DocumentRoot /srv/www/domain1.com/public_html1/ ErrorLog /srv/www/domain1.com/logs/error.log CustomLog /srv/www/domain1.com/logs/access.log combined < /VirtualHost < VirtualHost 12.34.56.78:80 ServerAdmin [email protected] ServerName domain2.com ServerAlias www.domain2.com DocumentRoot /srv/www/domain2.com/public_html1/ ErrorLog /srv/www/domain2.com/logs/error.log CustomLog /srv/www/domain2.com/logs/access.log combined < /VirtualHost The thing is when I put www.domain1.com into browser, apache2 doesn't retrieve the web page resides in /srv/www/domain1.com/public_html1/, instead, it gets the page from the default document root defined in another file. However, if I put www.domain2.com, everything works fine. I don't see any difference between two VirtualHost config block, so I wonder what does make the difference. BTW, I haven't put any .htaccess file under their document root. Thanks for your advice! Tianzhou

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  • Identifying and Resolving Oracle ITL Deadlock

    - by Allan
    I have an Oracle DB package that is routinely causing what I believe is an ITL (Interested Transaction List) deadlock. The relevant portion of a trace file is below. Deadlock graph: ---------Blocker(s)-------- ---------Waiter(s)--------- Resource Name process session holds waits process session holds waits TM-0000cb52-00000000 22 131 S 23 143 SS TM-0000ceec-00000000 23 143 SX 32 138 SX SSX TM-0000cb52-00000000 30 138 SX 22 131 S session 131: DID 0001-0016-00000D1C session 143: DID 0001-0017-000055D5 session 143: DID 0001-0017-000055D5 session 138: DID 0001-001E-000067A0 session 138: DID 0001-001E-000067A0 session 131: DID 0001-0016-00000D1C Rows waited on: Session 143: no row Session 138: no row Session 131: no row There are no bit-map indexes on this table, so that's not the cause. As far as I can tell, the lack of "Rows waited on" plus the "S" in the Waiter waits column likely indicates that this is an ITL deadlock. Also, the table is written to quite often (roughly 8 insert or updates concurrently, as often as 240 times a minute), so and ITL deadlock seems like a strong possibility. I've increased the INITRANS parameter of the table and it's indexes to 100 and increased the PCT_FREE on the table from 10 to 20 (then rebuilt the indexes), but the deadlocks are still occurring. The deadlock seems to happen most often during an update, but that could just be a coincidence, as I've only traced it a couple of times. My questions are two-fold: 1) Is this actually an ITL deadlock? 2) If it is an ITL deadlock, what else can be done to avoid it?

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  • Detect block size for quota in Linux

    - by Chen Levy
    The limit placed on disk quota in Linux is counted in blocks. However, I found no reliable way to determine the block size. Tutorials I found refer to block size as 512 bytes, and sometimes as 1024 bytes. I got confused reading a post on LinuxForum.org for what a block size really means. So I tried to find that meaning in the context of quota. I found a "Determine the block size on hard disk filesystem for disk quota" tip on NixCraft, that suggested the command: dumpe2fs /dev/sdXN | grep -i 'Block size' or blockdev --getbsz /dev/sdXN But on my system those commands returned 4096, and when I checked the real quota block size on the same system, I got a block size of 1024 bytes. Is there a scriptable way to determine the quota block size on a device, short of creating a known sized file, and checking it's quota usage?

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  • How to use regex to match ASTERISK in awk

    - by Ken Chen
    I'm stil pretty new to regular expression and just started learning to use awk. What I am trying to accomplish is writing a ksh script to read-in lines from text, and and for every lines that match the following: *RECORD 0000001 [some_serial_#] to replace $2 (i.e. 000001) with a different number. So essentially the script read in batch record dump, and replace the record number with date+record#, and write to separate file. So this is what I'm thinking the format should be: awk 'match($0,"/*FTR")!=0{$2="$DATE-n++"; print $0} match($0,"/*FTR")==0{print $0}' $BATCH > $OUTPUT but obviously "/*FTR" is not going to work, and I'm not sure if changing $2 and then write the whole line is the correct way to do this. So I am in need of some serious enlightenment.

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  • Using listpreference and getting the key works but no ok button...

    - by Allan
    I'm using listpreference in my android app and getting my key values and all is well and works good (now that you guys have helped me) BUT - when my listpreference menus popup, they only contain a cancel button. Let's say the user is choosing between red, blue, and green. When the listpreference dialog first pops-up, the dialog only shows a cancel button. Because of that, the dialog disappears as soon as the user selects their choice. I would like it so that when the user chooses their setting, they see the radio button get highlighted and then they go ahead and click the ok button...but I don't have an ok button and can't figure out why. Any help would be awesome...al

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  • Simulating MySQL's ORDER BY FIELD() in Postgresql

    - by Peer Allan
    Hello all, Just trying out Postgresql for the first time, coming from MySQL. In our Rails application we have a couple of locations with SQL like so: SELECT * FROM `currency_codes` ORDER BY FIELD(code, 'GBP', 'EUR', 'BBD', 'AUD', 'CAD', 'USD') DESC, name ASC It didn't take long to discover that this is not supported/allowed in Postgresql. Does anyone know how to simulate this behaviour in Postgres or do we have to pull to sorting out into the code? Thanks Peer

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  • Difference between Document-oriented-DB and Bigtable clones

    - by chen
    We are looking for a suitable storage engine for our weblog history data. We looked at Bigtable's paper and understand it is suitable to us well. However, I also understand that Document-oriented-DB such as MongoDB seems to provide a little more powerful schema power -- i.e, it can model our data as well. I wonder how nowadays ppl choose a scalable NoSQL DB --- I read enough articles like "we looked at A, B and C, and we decided to use C". But I'd like to see some benchmark number. What I am saying is that if MongoDB and the like can provide same level of performance as Bigtable clones, why don't web companies choose it (preparing to deal with various potentially more complex data problem)? Thanks, By the way, I read an article (which convinced me at the moment) saying Cassandra does not fit the M/R operation, any comments?

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