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• Spring Web application internal visual monitoring heap space and permgen.

  - by Veniamin

  If I have created web application used Spring framework(based on maven), can I include some module/dependency/plugin into my app to monitor Heap space, Permgen, etc. It whould be greate to get some charts output likes as in VisuaVM. For example: http://localhost:8080/monitoring = Including something likes VisualVM I have found next dependency without link to repo: <dependency> <groupId>com.sun.tools.visualvm</groupId> <artifactId>core</artifactId> <version>1.3.3</version> </dependency> How to use it?

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• Pass page scope attributes to a JSP using pagecontext.include for use in JSTL?

  - by hal10001

  We're using this JSP template solution almost verbatim at work: http://java.sun.com/developer/technicalArticles/javaserverpages/jsp_templates/ When it gets JSP pages to be included, it uses pageContext.include, which leaves us with one problem, and that is that we have a lot of scriplet code that gets initialized in the JSP itself (tag soup). My thought was to modify the template tag with an additional attribute that is a package path reference to a class with an init or execute method. That execute would get called first, and would add page context attributes before including the JSP. We would then use JSTL to access those attributes. However, I was told this wouldn't work because of how pageContext.include works, and the inability to pass through attributes scoped to the page. Is that true, and are there workarounds? I'm so-so on knowing all my scoping rules.

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• Why is an anonymous inner class containing nothing generated from this code?

  - by Andrew Westberg

  When run through javac on the cmd line Sun JVM 1.6.0_20, this code produces 6 .class files OuterClass.class OuterClass$1.class OuterClass$InnerClass.class OuterClass$InnerClass2.class OuterClass$InnerClass$InnerInnerClass.class OuterClass$PrivateInnerClass.class When run through JDT in eclipse, it produces only 5 classes. OuterClass.class OuterClass$1.class OuterClass$InnerClass.class OuterClass$InnerClass2.class OuterClass$InnerClass$InnerInnerClass.class OuterClass$PrivateInnerClass.class When decompiled, OuterClass$1.class contains nothing. Where is this extra class coming from and why is it created? package com.test; public class OuterClass { public class InnerClass { public class InnerInnerClass { } } public class InnerClass2 { } //this class should not exist in OuterClass after dummifying private class PrivateInnerClass { private String getString() { return "hello PrivateInnerClass"; } } public String getStringFromPrivateInner() { return new PrivateInnerClass().getString(); } }

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• Minimizing Java Thread Context Switching Overhead

  - by binil

  I have a Java application running on Sun 1.6 32-bit VM/Solaris 10 (x86)/Nahelem 8-core(2 threads per core). A specific usecase in the application is to respond to some external message. In my performance test environment, when I prepare and send the response in the same thread that receives the external input, I get about 50 us advantage than when I hand off the message to a separate thread to send the response. I use a ThreadPoolExecutor with a SynchronousQueue to do the handoff. In your experience what is the acceptable delay between scheduling a task to a thread pool and it getting picked up for execution? What ideas had worked for you in the past to try improve this?

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• Checking JRE version inside browser

  - by Brian Lewis

  Basically, I'm wanting to figure out the best way to check the user's JRE version on a web page. I have a link to a JNLP file that I only want to display if the user's JRE version is 1.6 or greater. I've been playing around with the deployJava JavaScript code (http://java.sun.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html) and have gotten it to work in every browser but Safari (by using deployJava.versionCheck). For whatever reason, Safari doesn't give the most updated JRE version number - I found this out by displaying the value of the getJREs() function. I have 1.6.0_20 installed, which is displayed in every other browser, but Safari keeps saying that only 1.5.0 is currently installed. I've also tried using the createWebStartLaunchButtonEx() function and specifying '1.6.0' as the minimum version, but when I click the button nothing happens (in any browser). Any suggestions?

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• Call REST service while impersonating a user that is already authorized to the glasfish server

  - by user1894489

  There are two web-applications deployed on a glassfish server. Both web applications provide a REST web service. the access to both web-services is secured via glassfish security constraints (at the moment BASIC Auth and file-realm). Let's say a user is accessing the service of web application A. After he is authorized, service A wants to call service B via REST client. Is there a way for a service to impersonate a user that is already authorized to the glasfish server? Maybe something like forwarding the security context or editing the headers? Is there another Filter? @Context private SecurityContext securityContext; username = securityContext.getUserPrincipal().getName(); password = ??? client.addFilter(new com.sun.jersey.api.client.filter.HTTPBasicAuthFilter(username, password)); Thanks!

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• how to show image from ms access to jpanel in java netbeans

  - by Shiv

  I have used this code : private void okActionPerformed(java.awt.event.ActionEvent evt) { try { String Update = name.getText(); Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection connection = DriverManager.getConnection("jdbc:odbc:NewPData"); PreparedStatement psmnt = connection.prepareStatement("SELECT Image FROM Table1 where Name='" + Update + "'"); ResultSet rs = psmnt.executeQuery(); Blob blob = rs.getBlob("Image"); int b; InputStream bis = rs.getBinaryStream("Image"); FileOutputStream f = new FileOutputStream("Image.jpg"); while ((b = bis.read()) >= 0) { f.write(b); } f.close(); bis.close(); icon = new ImageIcon(blob.getBytes(1L, (int) blob.length())); lblImage.setIcon(icon); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } Exception it show is java.lang.UnsupportedOperationException i have stored image first in ms access and now i want to show it on a label plz help

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• Startup params for Silverlight 4 app

  - by Number8

  Hello -- We are moving our SL3 app to SL4. First step was to open it in VS2010; it converted w/o problem. However, parameters specified for the start page are not passed along. That is, if we specify ourStartPage.aspx?Slam=Dunk&Glass=Sun in app.xaml.cs, Application_Startup(), e.InitParams is empty. How do we fix this? Thanks for any advice.... (Note that the very same startup string worked in VS2008.)

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• Http post with basic authorization don't work in java

  - by glebreutov

  This code work without exceptions but post request does not work. What I do wrong? I use Java 1.6, JBoss 4.2.3 String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + "<message><service id=\"210\"/><to>+"+phone+"</to>" + "<body content-type=\"text/plain\">"+message+"</body></message>"; String userPassword = "login:password"; URL url = new URL(ksGateUrl); URLConnection urlc = url.openConnection(); urlc.setDoOutput(true); urlc.setUseCaches(false); urlc.setAllowUserInteraction(false); urlc.setRequestProperty("Authorization", "Basic " + new sun.misc.BASE64Encoder().encode (userPassword.getBytes())); OutputStreamWriter wr = new OutputStreamWriter(urlc.getOutputStream(), "UTF-8"); wr.write(xml); wr.flush();

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• What is a good way to quantify C++ knowledge and skill?

  - by LoudNPossiblyRight

  I have only recently started to study (with the hopes of mastering) C++, one because i have started to love it and two because it's a good career/profession move. At the same time i wish to quantify my knowledge and skill so as to set my self apart from those who just throw C/C++ on their resumes and fish. Is there an open, industry and community recognized way of quantifying ones knowledge and skill in C++? I have looked at Brainbench, MS C++ certificates, and other online certification sites which offer to rate you at $50-$200 per test however there doesn't seem to be a standard on how to rate knowledge and skill. It's one thing for MS or Oracle/Sun to have certifications for their products but C++ is a standard, shouldn't there be a standard way or rating one's knowledge and skill there in? Thanks.

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• JVM specification and Java compiler code useful for SCJP preparation ?

  - by BenoitParis

  I'm preparing the SCJP exam with the almost official study book ("SCJP Sun Certified Programmer for Java 6 Exam 310-065") I understand that Java programming is writting code that fulfills a certain high-level contract; So that Java can stay platform-independent. However, I have trouble understanding and remembering things when it comes to highly specific SCJP items (and they are numerous) The book stays high-level and does not provide examples of how one compiler would handle things. This is the same thing for runtime issues (JVM level): things are too much abstract for me. Rules often seems arbitrary and therefore, with no well defined purpose, are difficult to remember. Or maybe it's that sometimes I just don't get the underlying purpose. And here is the question: Would a JVM specification and/or some java compiler code help in preparing the SCJP? Have you had the need for such material or is the book sufficient enough? Also, please share the resources you used, apart from the book.

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• server.sh gives me following error Exception"main" java.lang.NoClassDefFoundError:

  - by NickNaik

  i am trying to start the "Program D" from the terminal, command in terminal "sh server.sh" gives me following error Starting Alicebot Program D. Exception in thread "main" java.lang.NoClassDefFoundError: org/alicebot/server/net/AliceServer Caused by: java.lang.ClassNotFoundException: org.alicebot.server.net.AliceServer at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) My Server.sh file ALICE_HOME=.SERVLET_LIB=lib/servlet.jar ALICE_LIB=lib/aliceserver.jar JS_LIB=lib/js.jar # Set SQL_LIB to the location of your database driver. SQL_LIB=lib/mysql_comp.jar # These are for Jetty; you will want to change these if you are using a different http server. HTTP_SERVER_LIBS=lib/org.mortbay.jetty.jar:lib/javax.xml.jaxp.jar:lib/org.apache.crimson.jar PROGRAMD_CLASSPATH=$SERVLET_LIB:$ALICE_LIB:$JS_LIB:$SQL_LIB:$HTTP_SERVER_LIBS java -classpath $PROGRAMD_CLASSPATH -Xms64m -Xmx64m org.alicebot.server.net.AliceServer $1

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• Scala Eclipse IDE suddenly ignoring breakpoints

  - by malsmith

  I've been using Scala 2.8RC1 and Scala Eclipse plugin for 2.8 RC1 happily for a few days. However, last night after adding a couple jar files to my environment (apache http client jars) the debugger just stopped stopping at breakpoints in scala code. Java code stops fine at breakpoints. I tried creating a new mimimal scala app breakpoints don't stop. I've tried switching to sun-jre-1.6.0.20 from the openjdk-1.6.18 I had been using. I've switched to the scala 2.8 nightly and also eclipse plugin for scala nightly builds. No luck. I would greatly appreciate ideas for fixes. Rather frustrating as the initial experience with 2.8 was really great.

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• Cannot connect via HTTPS in Java app on MacOSX (Certificate validation issue)

  - by johnnyx

  I have a java application that connects to a webservice over https. The domain where i host the webservice has a valid Goddaddy issued SSL certificate. The application works fine on Windows but on MacOSx i receive the following exception when attempting to connect to the webservice via https. sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target I've tested it on two machines running Mac OS X 10.7.2 with the latest java runtime updates. I understand this is usually a problem with self signed certificates that need to be added manually, but i have a valid Godaddy issued certificate. In webbrowsers (safari & firefox) on mac os the certificate is recognized and seems ok. I even tried adding the certificate to the key chain manually like in the gase of a self signed one but to no result.

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• Alternatives libraries for loading PNG images

  - by Robert

  My java J2SE application is reading a lot of (png) images from the web and some of them use features such as a transparency color for true-color images (tRNS section) that Sun's/Oracle's PNGImageReader implementation simply ignores. Therefore the common solution for loading via ImageIO.read(...); does not work for me as it relies on this incomplete PNGImageReader implementation. Does anybody know a png reader implementation that can read all forms of PNG images correctly - those with color table or true-color and alpha transparency or transparent color? As it is for a GPL project it should be a non-commercial one that can be included without licensing problems into the app. Edit: My be this question was too specific. Therefore let be redesign my question: Who knows alternative implementations and libraries that are able to load PNG files? I will then test the implementations for their capabilities to load some test png images. Edit2: The end result have to be a BufferedImage

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• handling Javascript actions in PDF with Java

  - by Stroboskop

  I'm trying to make PDF forms (aka AcroForms) editable in Java. So far i got the GUI editing and printing working using Bruno Lowagie's iText and Sun's pdf-renderer. But now i'm close to scrapping it all, because after switching from try & error to reading the PDF specification, i realized that it's all worthless unless i can make the multitude of possible JavaScript actions work as well. I don't think iText can do that. So in short: are there any Java libraries that do proper form handling including actions? Or maybe even a Java GUI component to edit form data?

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• Solution for distributing MANY simple network tasks?

  - by EmpireJones

  I would like to create some sort of a distributed setup for running a ton of small/simple REST web queries in a production environment. For each 5-10 related queries which are executed from a node, I will generate a very small amount of derived data, which will need to be stored in a standard relational database (such as PostgreSQL). What platforms are built for this type of problem set? The nature, data sizes, and quantities seem to contradict the mindset of Hadoop. There are also more grid based architectures such as Condor and Sun Grid Engine, which I have seen mentioned. I'm not sure if these platforms have any recovery from errors though (checking if a job succeeds). What I would really like is a FIFO type queue that I could add jobs to, with the end result of my database getting updated. Any suggestions on the best tool for the job?

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• show only those columns which have data value

  - by Zankar

  I don't known that it is possible or not but i want to ask a question to you as suppose i have a table as table1 id | mon | tue | wed | thu | fri | sat | sun 1 | 100 | 200 | 0 | 0 | 0 | 0 | 0 2 | 200 | 0 | 300 | 0 | 0 | 0 | 0 So from given table result should be ... id | mon | tue | wed | 1 | 100 | 200 | 0 | 2 | 200 | 0 | 300 | as shown in table1 different columns of week. If all values in a column is 0 or null then query should ignore to show that column(as shown in result) Note: if we run a query as select * from table1 it shows all columns. While I don't wants a query like select id,mon,tue,wed from table1 because no. of showing columns may change. Please reply to me. Thank you....

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• Java Thread - Synchronization issue

  - by Yatendra Goel

  From Sun's tutorial: Synchronized methods enable a simple strategy for preventing thread interference and memory consistency errors: if an object is visible to more than one thread, all reads or writes to that object's variables are done through synchronized methods. (An important exception: final fields, which cannot be modified after the object is constructed, can be safely read through non-synchronized methods, once the object is constructed) This strategy is effective, but can present problems with liveness, as we'll see later in this lesson. Q1. Is the above statements mean that if an object of a class is going to be shared among multiple threads, then all instance methods of that class (except getters of final fields) should be made synchronized, since instance methods process instance variables?

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• Line by line image swing

  - by user1046017

  I want to show an image as it is downloading, I have the URL, and I am trying to get the image parts like this: InputStream openStream = url.openStream(); DataInputStream dis = new DataInputStream(new BufferedInputStream(openStream)); ByteArrayOutputStream os = new ByteArrayOutputStream(); while ((s = dis.read(b)) != -1) { os.write(b , 0, s); support.firePropertyChange("stream", null, os); } This way, any listener get the stream and creates an image, this way: if("stream".equals(evt.getPropertyName())){ try { ByteArrayOutputStream stream = (ByteArrayOutputStream) evt.getNewValue(); byte[] byteArray = stream.toByteArray(); stream.flush(); Image createImage = Toolkit.getDefaultToolkit().createImage(byteArray); this.getContentPane().add(new JLabel(new ImageIcon(createImage))); } catch (IOException ex) { Logger.getLogger(ImageTest.class.getName()).log(Level.SEVERE, null, ex); } } However, I am getting a "Premature end of JPEG file sun.awt.image.ImageFormatException: JPEG datastream contains no image" error, the image is a JPG image format, is there any library or method known to make something similar?

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• Class declaration bug (NoClassDefFoundError caused by ClassNotFoundException)

  - by aladine

  Please advise me what's wrong with this class declaration: ExchEngine.java package engine; public class ExchEngine { public ExchEngine() { } public static void main(String[] args) { ExchEngine engine=new ExchEngine() ; } } When I compile this file, I always get exception: java.lang.NoClassDefFoundError: test_engine/ExchEngine Caused by: java.lang.ClassNotFoundException: test_engine.ExchEngine at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) Exception in thread "main" This seems very weird that ExchEngine.java is inside a package and it cannot run itself. Thanks for any help.

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• Contents changed(cleared?) when access the pointer returned by std::string::c_str()

  - by justamask

  string conf()     {         vector v;         //..         v = func(); //this function returns a vector         return v[1];     }     void test()     {         const char* p = conf().c_str();         // the string object will be alive as a auto var         // so the pointer should be valid till the end of this function,right?           // ... lots of steps, but none of them would access the pointer p         // when access p here, SOMETIMES the contents would change ... Why?         // the platform is solaris 64 bit         // compiler is sun workshop 12         // my code is compiled as  ELF 32-bit MSB relocatable SPARC32PLUS Version 1, V8+ Required         // but need to link with some shared lib which are ELF 32-bit MSB dynamic lib SPARC Version 1, dynamically linked, stripped     }

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• Scanner's Read Line returning NoSuchElementException

  - by Brian

  This is my first time using StackOverflow. I am trying to read a text file which consists of a single number one the first line. try { Scanner s = new Scanner(new File("HighScores.txt")); int temp =Integer.parseInt(s.nextLine()); s.close(); return temp; } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } However, I get an error: java.util.NoSuchElementException: No line found at java.util.Scanner.nextLine(Unknown Source) at GameStart.getHighScore(GameStart.java:334) at GameStart.init(GameStart.java:82) at sun.applet.AppletPanel.run(Unknown Source) at java.lang.Thread.run(Unknown Source) I know that HighScores.txt is not empty, so why is this problem occuring? I tried using BufferedReader, and BufferReader.readLine() return null.

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• Website Images not indexed by Google, Yahoo and Bing

  - by Nabil Kadimi

  Hi, My classifieds website has been present online since 2006, the html pages are indexed and rank as expected whereas a search on Google Images for site:example.com returns nothing & in Yahoo or Bing it returns only a few image results, 8 to 10. Here is an example of a response HTTP headers as reported by Firebug: Date Sat, 15 Jan 2011 20:38:21 GMT Server Apache Cache-Control max-age=34560000 Expires Sun, 19 Feb 2012 20:38:21 GMT Accept-Ranges bytes Last-Modified Fri, 14 Jan 2011 21:59:16 GMT Vary Accept-Encoding Content-Encoding gzip Content-Length 21675 Connection close Content-Type image/jpeg What should I do to tell search engines to index my website images? Thanks in advance.

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• Persisting non-entity class that extends an entity (jpa) - example?

  - by Michal Minicki

  The JPA tutorial states that one can have a non-entity that extends entity class: Entities may extend both entity and non-entity classes, and non-entity classes may extend entity classes. - http://java.sun.com/javaee/5/docs/tutorial/doc/bnbqa.html Is it possible to persist such structure? I want to do this: @Entity abstract class Test { ... } class FirstConcreteTest extends Test { ... } // Non-ntity class SecondConcreteTest extends Test { ... } // Non-entity Test test = new FirstConcreteTest(); em.persist(test); What I would like it to do is to persist all fields mapped on abstract Test to a common database table for all concrete classes (first and second), leaving all fields of first and second test class unpersisted (these can contain stuff like EJBs, jdbc pools, etc). And a bonus question. Is it possible to persist abstract property too? @Entity abstract class Test { @Column @Access(AccessType.PROPERTY) abstract public String getName(); } class SecondConcreteTest extends Test { public String getName() { return "Second Concrete Test"; } }

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