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  • Is there a goto statement in java?

    - by Venkats
    I'm confused about this. Most of us have been told that there is no goto statement in Java. But I found that it is one of the keyword in Java. Where can it be used? If it can not be used, then why was it included in Java as a keyword?

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  • Java Simple Chat Box

    - by Allen
    I am trying to create a very simple chat window that simply has the ability to display some text, which i add to from time to time. However I get the following run time error when attempting to append text to the window: java.lang.ClassCastException: javax.swing.JViewport cannot be cast to javax.swing.JTextPane at ChatBox.getTextPane(ChatBox.java:41) at ChatBox.getDocument(ChatBox.java:45) at ChatBox.addMessage(ChatBox.java:50) at ImageTest2.main(ImageTest2.java:160) Here is the class to handle the basic operations: public class ChatBox extends JScrollPane { private Style style; public ChatBox() { StyleContext context = new StyleContext(); StyledDocument document = new DefaultStyledDocument(context); style = context.getStyle(StyleContext.DEFAULT_STYLE); StyleConstants.setAlignment(style, StyleConstants.ALIGN_LEFT); StyleConstants.setFontSize(style, 14); StyleConstants.setSpaceAbove(style, 4); StyleConstants.setSpaceBelow(style, 4); JTextPane textPane = new JTextPane(document); textPane.setEditable(false); this.add(textPane); } public JTextPane getTextPane() { return (JTextPane) this.getComponent(0); } public StyledDocument getDocument() { return (StyledDocument) getTextPane().getStyledDocument(); } public void addMessage(String speaker, String message) { String combinedMessage = speaker + ": " + message; StyledDocument document = getDocument(); try { document.insertString(document.getLength(), combinedMessage, style); } catch (BadLocationException badLocationException) { System.err.println("Oops"); } } } if there is a simpler way to do this, by all means let me know. I only need the text to be of a single font type, and uneditable by the user. Aside from that, I just need to be able to append text on the fly.

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  • Setting java.awt.headless=true programmatically

    - by reto
    I'm trying to set java.awt.headless=true during the application startup but it appears like I'm to late and the non-headless mode is already started: static { System.setProperty("java.awt.headless", "true"); /* java.awt.GraphicsEnvironment.isHeadless() returns false */ } Is there another way set headless=true beside -Djava.awt.headless? I would prefer to not configure anything on the console. Thanks! Reto

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  • Compiling Java code in terminal having a Jar in CLASSPATH

    - by Masi
    How can you compile the code using javac in a terminal by using google-collections in CLASSPATH? Example of code trying to compile using javac in a terminal (works in Eclipse) import com.google.common.collect.BiMap; import com.google.common.collect.HashBiMap; public class Locate { ... BiMap<MyFile, Integer> rankingToResult = HashBiMap.create(); ... } Compiling in terminal src 288 % javac Locate.java Locate.java:14: package com.google.common.collect does not exist import com.google.common.collect.BiMap; ^ Locate.java:15: package com.google.common.collect does not exist import com.google.common.collect.HashBiMap; ^ Locate.java:153: cannot find symbol symbol : class BiMap location: class Locate BiMap<MyFile, Integer> rankingToResult = HashBiMap.create(); ^ Locate.java:153: cannot find symbol symbol : variable HashBiMap location: class Locate BiMap<MyFile, Integer> rankingToResult = HashBiMap.create(); ^ 4 errors My CLASSPATH src 289 % echo $CLASSPATH /u/1/bin/javaLibraries/google-collect-1.0.jar

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  • Can you do icon overlays using Java on Windows OS

    - by Saviz
    I would like to manupilate badges or icon overlays using Java on windows. Basically some files on the drive to have overlays depending what state those files are in. This should be visible through windows explorer. Something simillar to how DropBox does things. Is that possible? I've seen several articles on this topic but none of them use Java. They all seem to use C++ or C# or COM objects. I was looking for a Java solution for windows. Of course I'd like to have a Java solution on Mac's too. Not sure if this is possible but before I give up I thought I ask.

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  • Java obfuscators

    - by jbu
    I'm looking for a good Java obfuscator. I've done initial research into the following Java obfuscators: proguard, yguard, retroguard, dasho, allatori, jshrink, smokescreen, jobfuscate, marvin, jbco, jode, javaguard, jarg, joga, cafebabe, donquixote, mwobfu, bbmug, zelix klassmaster, sandmark, jcloak, thicket, blufuscator, and java code protector. I tried proguard and it has a really nice GUI, seems really stable, and seems to be the most popular, but it seemed to not like some enumeration on a referenced jar file (not within the code I was trying to obfuscate) which was weird. Yguard seems to require some interaction with ant, which I didn't know too much about. What is a good java obfuscator? It doesn't need to be free, it just needs to work well and be easy to use.

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  • How to register a QueryExecuterFactory in jasper reports in java

    - by Bosso
    Hi, I implemented JRQueryExecuter and want to use it in a report. Using iReport I managed to register and use the executer. Now I want to use it in a java application, but I can't find any resources how to register the factory. I thought it's enough to have the implementation in the classpath, but I get the following exception: Caused by: net.sf.jasperreports.engine.JRException: No query executer factory class registered for tmql queries. at net.sf.jasperreports.engine.query.DefaultQueryExecuterFactoryBundle.getQueryExecuterFactory(DefaultQueryExecuterFactoryBundle.java:80) at net.sf.jasperreports.engine.util.JRQueryExecuterUtils.getQueryExecuterFactory(JRQueryExecuterUtils.java:57) at net.sf.jasperreports.engine.design.JRDesignDataset.queryLanguageChanged(JRDesignDataset.java:1006) Can anybody give me a hint? regards Hannes

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  • Reading inputs in java

    - by Gandalf StormCrow
    Hello everyone I'm trying to improve my Java skills by solving some problems from ACM, now the thing is my sample input looks like this : 3 100 34 100 75 250 27 2147483647 101 304 101 303 -1 -1 So at first I'm just trying to read them but its not working here is the java code: import java.io.BufferedInputStream; import java.util.Scanner; public class Main { public static void main(String args[]) { Scanner stdin = new Scanner(new BufferedInputStream(System.in)); while (stdin.hasNext()) { System.out.println(stdin.nextInt() + " and the next " + stdin.nextInt()); } } } I'm trying to send these inputs as an argument, and not by reading them from file, here is how: The program just spins(executes) but not printing anything. How can I fix this?

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  • Java operator precedence guidelines

    - by trashgod
    Misunderstanding Java operator precedence is a source of frequently asked questions and subtle errors. I was intrigued to learn that even the Java Language Specification says, "It is recommended that code not rely crucially on this specification." JLS §15.7 Preferring clear to clever, are there any useful guidelines in this area? Here are a number of resources on the topic: JLS Operators JLS Precedence Java Glossary Princeton Sun Tutorial University of West Florida Usenet discussion Additions or corrections welcome.

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  • "java.lang.ClassNotFoundException: javax.ejb.EJBObject" when running JAR

    - by Bernhard V
    Hi, I'm getting a "java.lang.ClassNotFoundException: javax.ejb.EJBObject" error when I'm running my application as a JAR file. When running it in Eclipse everything is working fine. The application properly access the main class and the main method. But when it tries to load the application context it cannot resolve a reference to an EJB bean. I then get the following error: Error creating bean with name 'bc' defined in class path resource [blabla.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/ejb/EJBObject at org.springframework.beans.factory.support.BeanDefinitionValueResolver .resolveReference(BeanDefinitionValueResolver.java:275) ... Caused by: java.lang.ClassNotFoundException: javax.ejb.EJBObject I've included all runtime-scoped dependencies with Maven in the JAR file. Do you know any further information regarding this error?

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  • Java JMS Messaging

    - by London
    Hello, I have a working example of sending message to server and server receiving it via qpid messaging. Here is simple hello world to send to server : http://pastebin.com/M7mSECJn And here is server which receives requests and sends response(the current client doesn't receive response) : http://pastebin.com/2mEeuzrV Here is my property file : http://pastebin.com/TLEFdpXG They all work perfectly, I can see the messages in the qpid queue via Qpid JMX management console. These examples are downloaded from https://svn.apache.org/repos/asf/qpid/trunk/qpid/java/client/example (someone may need it also). I've done Jboss messaging using spring before, but I can't manage to do the same with qpid. With jboss inside applicationsContext I had beans jndiTemplate, conectionFactory, destinationQueue, and jmscontainer like this : <!-- Queue configuration --> <bean id="jndiTemplate" class="org.springframework.jndi.JndiTemplate"> <property name="environment"> <props> <prop key="java.naming.factory.initial">org.jnp.interfaces.NamingContextFactory</prop> <prop key="java.naming.provider.url">jnp://localhost:1099</prop> <prop key="java.naming.factory.url.pkgs">org.jboss.naming:org.jnp.interfaces</prop> <prop key="java.naming.security.principal">admin</prop> <prop key="java.naming.security.credentials">admin</prop> </props> </property> </bean> <bean id="connectionFactory" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiTemplate" ref="jndiTemplate" /> <property name="jndiName" value="ConnectionFactory" /> </bean> <bean id="queueDestination" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiTemplate" ref="jndiTemplate" /> <property name="jndiName"> <value>queue/testQueue</value> </property> </bean> <bean id="jmsContainer" class="org.springframework.jms.listener.DefaultMessageListenerContainer"> <property name="connectionFactory" ref="connectionFactory" /> <property name="destination" ref="queueDestination" /> <property name="messageListener" ref="listener" /> </bean> and of course sender and listener : Now I'd like to rewrite this qpid example using spring context logic. Can anyone help me?

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  • Setting classpath java for use in Runtime.exec

    - by phil swenson
    I am trying to spawn a process using Runtime.exec. I want to use my current classpath : System.getProperty("java.class.path") Unfortunately, I am having all kinds of issues. When it works on my mac, it doesn't work on Windows. And doesn't work on my mac ever when there is a space in the classpath. The error I always get is ClassDefNotFound, so it's related to how I'm building and passing in the classpath. here is some sample code: String startClass = "com.test.MyClass" String javaHome = System.getProperty("java.home"); String javaCmd = javaHome + "/bin/java"; String classPath = "-Djava.class.path=" + System.getProperty("java.class.path"); String[] commands = new String[]{javaCmd, classPath, startClass}; String commandString = StringUtils.join(commands, " "); Process process = Runtime.getRuntime().exec(commandString); So, how should I setup the classpath? Thanks for any help

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  • "Forked Java VM exited abnormally" error from junit tests

    - by Alb
    I have a java junit test that passes when run alone on a development machine. We also have a hudson job which runs all the tests, invoked via ant, on a Mac OS X 10.4 node with Java 1.5. The test was passing in the hudson build until recently but now (with no related code changes) one test fails everytime with the following error: Error Message Forked Java VM exited abnormally. Please note the time in the report does not reflect the time until the VM exit. Stacktrace junit.framework.AssertionFailedError: Forked Java VM exited abnormally. Please note the time in the report does not reflect the time until the VM exit. googling shows many others seem to have run into the same problem but there I couldn't find any answer.

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  • Java stuff you didn't know you didn't know

    - by pretzelstick
    What are some Java language features or Java related tools that you were embarrassed to find that you didn't know about? Examples for me are: jmap RuntimeException Please post things every Java programmer should know about, be they language features, tools, or facts about how the JVM works, but that you found out about long after you should have.

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  • bundles in java?

    - by fayer
    in symfony 2.0 and django there are bundles that contain everything for a feature (html, css, js, img, php/python). so if you want to delete one feature, you basically just delete that bundle and unregister it from "main". are there java frameworks for this too? or is it different in java cause java is a compiling language. thanks

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  • Weblogic EJB calls start to fail under moderate load with OptionalDataException

    - by MarkoU
    Our system setup consists of two Weblogic 10.3 servers: one hosts the presentation layer and the other hosts the EJBs. The system runs fine under moderate load for some time (one to several days) after which EJB method calls from the presentation server to the EJB server start to fail with the following error: java.rmi.RemoteException: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: java.io.OptionalDataException Stack trace: java.io.OptionalDataException at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1349) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at weblogic.utils.io.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:197) at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:564) at weblogic.utils.io.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:193) at weblogic.jndi.internal.RootNamingNode_WLSkel.invoke(Unknown Source) at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:589) at weblogic.rmi.cluster.ClusterableServerRef.invoke(ClusterableServerRef.java:230) at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:477) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363) at weblogic.security.service.SecurityManager.runAs(Unknown Source) at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:473) at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118) Once the first OptionalDataException is encountered all subsequent calls fail with the same result. Some sources suggest that this might be related to cluster multicast port being misconfigured. However, these servers do not belong to a cluster. Booting the EJB server always temporarily resolves the issue, but the issue seems to occur again after some time. Any ideas?

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  • Java REPL onsole

    - by Don
    Hi, I'm looking for a console that I can use to test out snippets of Java code. Either a desktop app, or a web app (like the Groovy web console). Ideally, the console should automatically import commonly used package like java.io.* java.util.* So that I can copy and paste code from a class without having to add a bunch of imports. Does such a thing exist? Thanks, Donal

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  • Can't debug Java Windows Services with jhat, jps, jstack

    - by Matthew McCullough
    I frequently showcase the jhat, jps, and jstack tool set to developers on Linux and Mac. However, a developer recently indicated that these are unusable in Windows if the Java app in question is running as a Windows Service. A Sun-filed bug says something very similar, but was closed due to inactivity. I have tested this out for myself, and indeed it appears true, though I can hardly believe it. Here is the setup: Tomcat or similar running as a Windows service with the "Log On As" == "Local System" A user with Admin privileges logged in to the same Windows machine. Admin opens Windows Task Manager, can see java.exe running Admin opens console, types "jps", gets back a list of processes that does not include Tomcat's java service process. As a brute force attempt, get the PID of tomcat as a service from Windows Task Manager. Type jstack < pid . Get a reply: < pid no such process This appears reproducible under Windows XP, Windows 2003 Server, and Windows 7. Java versions 1.5 and 1.6 yield the same outcome. Is there a way from the terminal, even though logged in as Admin, to "sudo up" to get JPS and the other tools to see the java service?

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  • Serial Communication between Java RXTX and Arduino

    - by SharpBarb
    I'm trying to communicate between my PC (Windows 7 using Netbeans and RXTX) with an Arduino Pro, using the serial port. The Arduino is actually connected to the PC using an FTDI cable. The code is based on the Java SimpleRead.Java found here. Currently the Arduino simply prints out a string when it starts up. My Java program should print the number of bytes that have been read and then print out the contents. The Java program works, sort of... If the string is long (10 bytes or so) the output will get broken up. So if on the Arduino I print Serial.println("123456789123456789"); //20 bytes including '\r' and '\n' The output of my Java program may look something like: Number of Bytes: 15 1234567891234 Number of Bytes: 5 56789 or Number of Bytes: 12 1234567891 Number of Bytes: 8 23456789 I'm thinking it's a timing problem, because when I manually go through the code using the debugger, the result string is always what it should be: one 20 byte string. I've been messing with various things but I haven't been able to fix the problem. Here is the part of the code that is giving me problems: static int baudrate = 9600, dataBits = SerialPort.DATABITS_8, stopBits = SerialPort.STOPBITS_1, parity = SerialPort.PARITY_NONE; byte[] readBuffer = new byte[128]; ... ... public void serialEvent(SerialPortEvent event) { if (event.getEventType() == SerialPortEvent.DATA_AVAILABLE) { try { if (input.available() > 0) { //Read the InputStream and return the number of bytes read numBytes = input.read(readBuffer); String result = new String(readBuffer,0,numBytes); System.out.println("Number of Bytes: " + numBytes); System.out.println(result); } } catch (IOException e) { System.out.println("Data Available Exception"); } }

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  • Experience migrating legacy Cobol/PL1 to Java

    - by MadMurf
    ORIGINAL Q: I'm wondering if anyone has had experience of migrating a large Cobol/PL1 codebase to Java? How automated was the process and how maintainable was the output? How did the move from transactional to OO work out? Any lessons learned along the way or resources/white papers that may be of benefit would be appreciated. EDIT 7/7: Certainly the NACA approach is interesting, the ability to continue making your BAU changes to the COBOL code right up to the point of releasing the JAVA version has merit for any organization. The argument for procedural Java in the same layout as the COBOL to give the coders a sense of comfort while familiarizing with the Java language is a valid argument for a large organisation with a large code base. As @Didier points out the $3mil annual saving gives scope for generous padding on any BAU changes going forward to refactor the code on an ongoing basis. As he puts it if you care about your people you find a way to keep them happy while gradually challenging them. The problem as I see it with the suggestion from @duffymo to Best to try and really understand the problem at its roots and re-express it as an object-oriented system is that if you have any BAU changes ongoing then during the LONG project lifetime of coding your new OO system you end up coding & testing changes on the double. That is a major benefit of the NACA approach. I've had some experience of migrating Client-Server applications to a web implementation and this was one of the major issues we encountered, constantly shifting requirements due to BAU changes. It made PM & scheduling a real challenge. Thanks to @hhafez who's experience is nicely put as "similar but slightly different" and has had a reasonably satisfactory experience of an automatic code migration from Ada to Java. Thanks @Didier for contributing, I'm still studying your approach and if I have any Q's I'll drop you a line.

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  • Java RS232 Comm on Vista-64 bit

    - by DD
    We have a Java application which needs to communicate with a peripheral device over Virtual Serial COM port. We use the RS232 Java COMM API (javax.comm.properties, comm.jar, win32com.dll) to achieve the same. Currently the code works fine on Windows XP 32-bit, Vista 32-bit and Windows 7. However we are having a problem trying to communicate on Vista 64-bit. I read from the Java forums that there is no 64-bit support for the Java COMM API I was wondering if anyone was facing a similar situation and were able to resolve the same in some way?

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  • What is missing from the Java API?

    - by Jack
    I started using Java years ago and I've always found almost everything I need inside the standard API provided with JDK SE, with the exception of specific things that don't fit well inside a generic API, like GUI elements (graphs or so on) or advanced mathematical API.. So I was wondering: Which are the most important things that the Java API is missing? When I say "important", I mean either things that you have often needed, but have had to rely on custom libraries, or things that are usually are included in APIs, but not in Java's.

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  • useful Java books?

    - by Peter
    Hi all, I am looking for a Java book that gives you some useful Java tips and best practices. Seems like "Effective Java" is a good candidate? Do you have any other recommendations?

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