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• Is eclipse's Garbage Collector different than the default?

  - by Savvas Dalkitsis

  From questions posted here and an old one of mine I have created the impression that you cannot explicitly run the Java Garbage Collector whenever you please. If you call it, you simply instruct the system to call it whenever it can or thinks is appropriate. But in eclipse, if you press the "Run Garbage Collector" button you see an immediate reduction in memory usage. How is that possible? Is eclipse using a different Garbage Collector, does it have access to some secret API that we don't or is my conception of how the GC works wrong?

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• How to add an self defined attribute to ldap user?

  - by Arnab Das

  Hi, I have created an attribute in LDAP using the following code. attrs.put("NUMERICOID", "1.3.6.1.4.1.42.2.27.4.2.3.1.1.9"); attrs.put("NAME", "myattribute"); attrs.put("DESC", "for JNDITutorial example only"); attrs.put("SYNTAX", "1.3.6.1.4.1.1466.115.121.1.15"); DirContext schema = context.getSchema(""); DirContext newAttr = schema.createSubcontext ("AttributeDefinition/myattribute1", attrs); The attribute is created successfully, Now I am trying to add this attribute to a user say "user1"(uid). Attributes attributeslist = context.getAttributes(ld.getUserDN(username)); attributeslist.put("myattribute1", ""); context.modifyAttributes(ld.getUserDN("test5"), DirContext.REPLACE_ATTRIBUTE, attributeslist); But it gives me object class violation error. Can anyone help me to solve this? I need to add an user defined attribut to the user using java code.

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• Setting foreground color for HSSFCellStyle is always coming out black

  - by Ascalonian

  I am using POI to create an Excel spreadsheet in Java. I have the following code used for creating a header row: HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet("Report"); // some more code HSSFRow row = sheet.createRow(0); HSSFCell cell = row.createCell(cellNumber); HSSFCellStyle cellStyle = wb.createCellStyle(); cellStyle.setFillBackgroundColor(HSSFColor.GREY_25_PERCENT.index); cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND); HSSFFont font = wb.createFont(); font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); font.setColor(HSSFColor.WHITE.index); cellStyle.setFont(font); cell.setCellStyle(cellStyle); The issue I am having is that setting the fill background color on the cell always comes out black, no matter what color I pick. What am I doing wrong? If I don't use the "setFillPattern" line, no color shows up at all.

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• Dynamic programming: Largest diamond(rhombus) block

  - by Darksody

  I have a small program to do in Java. I have a 2D array filled with 0 and 1, and I must find the largest rhombus (as in square rotated by 90 degrees) and their numbers. Example: 0 1 0 0 0 1 1 0 1 1 1 0 1 0 1 1 1 1 0 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 Result: 1 1 1 1 1 1 1 1 1 1 1 1 1 The problem is similar to this SO question. If you have any idea, post it here.

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• "Ant all" not working for me

  - by bobjink

  I have got involved in a project. This project uses ant which is not something I am comfortable with. I have checked out the source code and tried running ant on the most outer directory. Running 'ant' in commando prompt takes 1 sec and I get a BUILD SUCCESFULL message. If I run 'ant all' I get a BUILD FAILED. Java.io.IOExceptio: Cannot run program "ant": CreateProcess=2, the system cannot find the file specified and then a long stacktrace. Most of the people on the project runs OS-X while I use Windows XP. Any help or information is appreciated :)

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• "Could not find the main class: bla.bla.yada", although specified correctly in the MANIFEST.MF

  - by Bernhard V

  Hi, I'm trying to run a .jar file with the command "java -jar Filename.jar", but I am always getting an error saying "Could not find the main class: bla.bla.yada". I build the whole application with Maven and specified a Main-Class in the MANIFEST.MF. The path in the file is correct and the class also exists at the right location in the jar. The ending .class is omitted in the MANIFEST.MF. I hope this is correct. Do you have any other hints?

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• CMIS explorer webapp

  - by Nicolas Raoul

  CMIS is a recently approved standard for accessing ECM repositories. My idea is to create a repository explorer using CMIS, under the form of an open source Java/JEE Web Application. The main interest would probably be for integrators, using it as a framework on which to quickly build repository access intranet/extranet applications. Of course, if such an open source project already exists, I would rather contribute to it rather than start a competing effort. So, does such an application/framework already exist? As open source? The only one I have found so far is chemistry-opencmis-test-browser, which is intended for tests and seems really inconvenient to extend for business use (no MVC, no IoC).

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• Libraries/Solutions for using XSL to create interactive web forms from XML

  - by Brabster

  This seems like a pretty straightforward thing to do, but I can't find anything off the open-source shelf. Is there a solution already out there that does the following: can be configured with an arbitrary XSL stylesheet generates a web form based on an arbitrary XML document and the XSL creates edit functionality in appropriate places in the rendered form updates the local representation of the XML document provides capabilities to view, save the new XML document Ideally, one that plugs into a Java web application. Even better if it can generate the XSL based on schema documents - but that might not be feasible, not really thought it through. For context, I'm thinking things like pleasant-for-humans editing of Maven POMs, ANT build.xml, etc. Cheers,

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• how does gwt work or rather how gwt loads the code into the app.html file

  - by Pero

  i would like to know what the rootPanel (which is in the entryClass) exactly is and how gwt loads the java code into the appname.html file via rootpanel. what happens there exactly? where is the connection between the rootpanel and the html file. i could not find any side which explains this process in a detail. the only thing i know i that all the created panels are div-elements. it would be very helpfulf if somebody could explain it or send some good links to websites which are explaining this issue. thx!

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• Findbugs warning: Equals method should not assume anything about the type of its argument

  - by Uri

  When running FindBugs on my project, I got a few instances of the error described above. Namely, my overriding versions of equals cast the RHS object into the same type as the object in which the overriding version is defined. However, I'm not sure whether a better design is possible, since AFAIK Java does not allow variance in method parameters, so it is not possible to define any other type for the equals parameter. Am I doing something very wrong, or is FindBugs too eager? A different way to phrase this question is: what is the correct behavior if the object passed to equals is not the same type as an LHS: Is this a false, or should there be an exception? For example: public boolean equals(Object rhs) { MyType rhsMyType = (MyType)rhs; // Should throw exception if(this.field1().equals(rhsMyType.field1())... // Or whatever }

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• getting core file

  - by ashwani66476

  Hello All I am running a Core JAVA application on AIX machine, and it creates a file named "core". My concern are 1. I am not able to open this "core" file in "Heap Analyzer" or "Thread Analyzer". 2. Which tools do I need to use, So that I can analyze this "core" file. 3. Could any one elaborate more about this file? why this "core" file creates. Waiting for response..... Many Thanks

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• sbt: "test" works "test:run" not

  - by Martin

  I try to establish a build pipeline on Jenkins with a Play(2.0.2) project. As I want to just build the sources once and use the classes for downstream builds, I now have created a "compile"-job, that runs "sbt test:compile". That works so far. The next job should then just run the compiled tests. If I use "sbt test" it works as expected, but compiles the sources again. But if I try to run "sbt test:run" it says: [info] Loading project definition from ~/myproject/project [info] Set current project to myproject (in build file: ~/myproject/) java.lang.RuntimeException: No main class detected. at scala.sys.package$.error(package.scala:27) [error] {file:~/myproject/test:run: No main class detected. The same happens locally. I can run "sbt test" but not "sbt test:run". Same error. Is there someone who can point me to the right direction?

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• deprecated readLine() What to change?

  - by user1681751

  I'm trying to get this to work in the eclipse, but the "readLine" is striked through and a notice says it is depreciated, the code works, albeit not the "while ((var2 = var5.readLine()) != null) {" bit.. So I'm wondering how to fix it, a java beginner. String var2 = ""; HttpURLConnection var3 = null; DataOutputStream var4 = null; DataInputStream var5 = null; ...more code here.... try { var5 = new DataInputStream(var3.getInputStream()); while ((var2 = var5.readLine()) != null) { System.out.println("Server Response " + var2); ScreenShotHelper.mc.thePlayer.addChatMessage("\u00a7aSuccessfully uploaded screenshot! Direct link:"); ScreenShotHelper.mc.thePlayer.addChatMessage("\u00a7a" + var2); } var5.close(); }

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• Dev efforts for different mobile platforms

  - by Juriy

  Hello guys, I'm in the middle of development of a client-server "socializing" that is supposed to run on several mobile devices. The project is pretty complex, involving networking, exchanging media, using geolocation services, and nice user UI. In terms of development efforts, technical risks and extensibility what is the best platform to start with? Taking into the account that the goal is go "live" as fast as possible with the mobile version. And second goal is to cover most users (but first is more important). iPhone (iPod iPad) Android BlackBerry Java ME, Symbian I realize that there are limitations on every platform, and there are different aspects to take into the account (for example iPhone has better developer's community then Android, J2ME runs in a terrible sandbox but covers most devices). Please share your pros and cons. I have the experience only with J2ME, unfortunately I can't evaluate other platforms.

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• Which build tool to teach?

  - by Helper Method

  While similiar questions have been asked, this one's focused on which is best/easiest to teach. I'm giving a weekly tutorial at my university focusing on data structures and algorithms. Fromn time to time I introduce tools which may prove helpful in future projects like JUnit, Mercurial, Eclipse etc.. I plan to show them some kind of build tool but I'm not sure which one to choose. I by myself have very little knowledge about build tools, except a little experience in using make. It's more the concept of a build tool I want to show them, not a special tool per se. Which would be the most easiest/future proof/whatever tool to show them? I've read a little bit about Gradle, which looks nice, but so far I think Ant could be a good choice (it's a Java course I'm giving).

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• rewrite URLs in CSS files

  - by Don

  Hi, I'm writing a Maven plugin that merges CSS files together. So all the CSS files that match /foo/bar/*.css might get merged to /foo/merged.css. A concern is that in a file such as /foo/bar/baz.css there might be a property such as: background: url("images/pic.jpg") So when the file is merged into /foo/merged.css this will need to be changed to background: url("bar/images/pic.jpg") The recalculated URL obviously depends on 3 factors: original URL original CSS file location merged CSS file location Assuming that the original and merged CSS files are both on the same filesystem, is there a general formula (or Java library) that can be used to calculate the new url given these 3 inputs? Thanks, Don

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• Twitter date unparseable?

  - by Andreas

  Hi, I want to convert the date string in a Twitter response to a Date object, but I always get a ParseException and I cannot see the error!?! Input string: Thu Dec 23 18:26:07 +0000 2010 SimpleDateFormat Pattern: EEE MMM dd HH:mm:ss ZZZZZ yyyy Method: public static Date getTwitterDate(String date) { SimpleDateFormat sf = new SimpleDateFormat(TWITTER); sf.setLenient(true); Date twitterDate = null; try { twitterDate = sf.parse(date); } catch (Exception e) {} return twitterDate; } I also tried this: http://friendpaste.com/2IaKdlT3Zat4ANwdAhxAmZ but that gives the same result. I use Java 1.6 on Mac OS X. Cheers, Andi

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• Validating a Postscript without trying to print it?

  - by Epaga

  Saving data to Postscript in my app results in a Postscript file which I can view without issues in GhostView, but when I try to print it, the printer isn't able to print it because it seems to be invalid. Is there a way to validate / find errors in Postscript files without actually sending it to a printer? Preferred would be some kind of Java API/library, but a program which does the same would be fine as well. Edit #1 : no I don't know why it's invalid, nor even necessarily if it's invalid, but would like to be able to validate it outside of ghostview, or figure out what's going on when it can't print. Answer : Well using the ps2ps trick I was able to see the output that Postscript does and there check the difference. The difference was that I am not allowed to have a decimal number for the width or height of images in the Postscript, but rather only integers. So I still didn't find a way to validate, but this way was good enough for my problem. Thanks.

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• Develop applications to mobiles

  - by muek

  Hi there, I have very easy question, but I simply have any idea of the answer. I have developed a small mobile-application using java, for my nokia. The problem is that when installed on my samsung the application simply crashed. Then I tried on my other nokia but different model, and I didn't got the normal behavior. So my question is, does anyone have any idea how companies that develop mobiles applications/games test their software. Does they have to have all models for all mobiles phones??

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• RegEx to match a pattern and exclude a part of the string

  - by rojanu

  Hi, I have got some strings to be matched via RegEx. We have a java application which reads the regex from a config file and takes two groups of strings, number of which are specified in the same config. E.g. CustomAction.523274ca945f.dialogLabel=Executing Custom Code... will be matched with (?m)^(?!#)\s*(\S*)\s*=\s*(\S*.*) What I need is to pick the first group "CustomAction.523274ca945f.dialogLabel" and exclude the random string in the middle so I end up with something like "CustomAction.dialogLabel" or "CustomAction..dialogLabel" well any other combination but the random string. Thanks

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• How to find multiples of the same integer in an arraylist?

  - by Dan

  Hi My problem is as follows. I have an arraylist of integers. The arraylist contains 5 ints e.g[5,5,3,3,9] or perhaps [2,2,2,2,7]. Many of the arraylists have duplicate values and i'm unsure how to count how many of each of the values exist. The problem is how to find the duplicate values in the arraylist and count how many of that particular duplicate there are. In the first example [5,5,3,3,9] there are 2 5's and 2 3's. The second example of [2,2,2,2,7] would be only 4 2's. The resulting information i wish to find is if there are any duplicates how many of them there are and what specific integer has been duplicated. I'm not too sure how to do this in java. Any help would be much appreciated. Thanks.

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• performance monitoring tools for multi-tenant web application

  - by Anton

  We have a need to monitor performance of our java web app. We are looking for some tolls which can help us with this task. The major difficulty is that we are SaaS provider with multi-tenant server architecture with hundreds of customers running on the same hardware. So far we tried commercial products like DynaTrace and Coradinat but unfortunately they don't get the job done so far. What we need is a simple report which would tell us if we had performance problems on each customer site in a specified period of time. Mostly it will be response time per customer but also we will need some more specifics based on the URLs. please let me know if someone had any experience with setting up such monitoring. Thanks!

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• Dynamic programming: Find largest diamond (rhombus)

  - by Darksody

  I have a small program to do in Java. I have a 2D array filled with 0 and 1, and I must find the largest rhombus (as in square rotated by 90 degrees) and their numbers. Example: 0 1 0 0 0 1 1 0 1 1 1 0 1 0 1 1 1 1 0 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 Result: 1 1 1 1 1 1 1 1 1 1 1 1 1 The problem is similar to this SO question. If you have any idea, post it here.

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• Trying to debug a plugin in tuxguitar, need help building the project in Eclipse.

  - by Shawn Simon

  I am not too familiar with java / eclipse but I am trying to debug a plugin in TuxGuitar. The plugin is the gtp plugin which allows reading of guitar pro files. I have imported the main project, TuxGuitar, and the TuxGuitar-gtp plugin. I have all build dependencies configured and the project builds. However, when I debug the app, the plugin is not available. The documentation says plugins are loaded from the share/plugins folder and they are jar files. I tried exporting the gtp plugin as a jar into the share/plugins folder, but it still does not load when I debug. Is there some sort of configuration I need to do in Eclipse? Thanks!

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• Programming with midi, and tuning notes to specific frequencies

  - by froggie0106

  I am working on a project in which I need to be able to generate midi notes of varying frequencies with as much accuracy as possible. I originally tried to write my program in Java, but it turns out that the sound.midi package does not support changing the tunings of notes unless the frequencies are Equal Tempered frequencies (or at least it didn't in 1.4, and I haven't been able to find evidence that this has been fixed in recent versions). I have been trying to find a more appropriate language/library to accomplish this task, but since this is my first time programming with MIDI and my need for specific tuning functionality is essential, I have been having considerable trouble finding exactly what I need. I am looking for advice from people who have experience writing MIDI programs as to what languages are useful, especially for tuning notes to specific frequencies. Any links to websites with API docs and example code would also be extremely helpful.

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