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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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• 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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• How to count java nio connection number

  - by bruce dou

  How to count java nio connection number

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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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• 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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• No output from exception

  - by Grasper

  Why does this code not print an exception stack trace? import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; public class Playground { /** * @param args */ public static void main(String[] args) { startThread(); } private static void startThread() { ScheduledExecutorService timer = Executors .newSingleThreadScheduledExecutor(); Runnable r = new Runnable() { int dummyInt = 0; boolean dummyBoolean = false; @Override public void run() { dummyInt = Integer.parseInt("AAAA"); if (dummyBoolean) { dummyBoolean= false; } else { dummyBoolean= true; } } }; timer.scheduleAtFixedRate(r, 0, 100, TimeUnit.MILLISECONDS); } } How can I get it to? I would expect to see this: java.lang.NumberFormatException: For input string: "AAAA" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at Playground$1.run(Playground.java:25) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source) at java.util.concurrent.FutureTask.runAndReset(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

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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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• 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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• 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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• 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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• Why is this giving me 2 different sets of timezones?

  - by chobo2

  Hi I have this line to get all the timezones Dictionary<string, TimeZoneInfo> storeZoneName = TimeZoneInfo.GetSystemTimeZones().ToDictionary(z => z.DisplayName); Now when I upload I try it on my local machine I get this (UTC-12:00) International Date Line West (UTC-11:00) Coordinated Universal Time-11 (UTC-11:00) Samoa (UTC-10:00) Hawaii (UTC-09:00) Alaska (UTC-08:00) Baja California (UTC-08:00) Pacific Time (US & Canada) (UTC-07:00) Arizona (UTC-07:00) Chihuahua, La Paz, Mazatlan (UTC-07:00) Mountain Time (US & Canada) (UTC-06:00) Central America (UTC-06:00) Central Time (US & Canada) (UTC-06:00) Guadalajara, Mexico City, Monterrey (UTC-06:00) Saskatchewan (UTC-05:00) Bogota, Lima, Quito (UTC-05:00) Eastern Time (US & Canada) (UTC-05:00) Indiana (East) (UTC-04:30) Caracas (UTC-04:00) Asuncion (UTC-04:00) Atlantic Time (Canada) (UTC-04:00) Cuiaba (UTC-04:00) Georgetown, La Paz, Manaus, San Juan (UTC-04:00) Santiago (UTC-03:30) Newfoundland (UTC-03:00) Brasilia (UTC-03:00) Buenos Aires (UTC-03:00) Cayenne, Fortaleza (UTC-03:00) Greenland (UTC-03:00) Montevideo (UTC-02:00) Coordinated Universal Time-02 (UTC-02:00) Mid-Atlantic (UTC-01:00) Azores (UTC-01:00) Cape Verde Is. (UTC) Casablanca (UTC) Coordinated Universal Time (UTC) Dublin, Edinburgh, Lisbon, London (UTC) Monrovia, Reykjavik (UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna (UTC+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague (UTC+01:00) Brussels, Copenhagen, Madrid, Paris (UTC+01:00) Sarajevo, Skopje, Warsaw, Zagreb (UTC+01:00) West Central Africa (UTC+02:00) Amman (UTC+02:00) Athens, Bucharest, Istanbul (UTC+02:00) Beirut (UTC+02:00) Cairo (UTC+02:00) Harare, Pretoria (UTC+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius (UTC+02:00) Jerusalem (UTC+02:00) Minsk (UTC+02:00) Windhoek (UTC+03:00) Baghdad (UTC+03:00) Kuwait, Riyadh (UTC+03:00) Moscow, St. Petersburg, Volgograd (UTC+03:00) Nairobi (UTC+03:30) Tehran (UTC+04:00) Abu Dhabi, Muscat (UTC+04:00) Baku (UTC+04:00) Port Louis (UTC+04:00) Tbilisi (UTC+04:00) Yerevan (UTC+04:30) Kabul (UTC+05:00) Ekaterinburg (UTC+05:00) Islamabad, Karachi (UTC+05:00) Tashkent (UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi (UTC+05:30) Sri Jayawardenepura (UTC+05:45) Kathmandu (UTC+06:00) Astana (UTC+06:00) Dhaka (UTC+06:00) Novosibirsk (UTC+06:30) Yangon (Rangoon) (UTC+07:00) Bangkok, Hanoi, Jakarta (UTC+07:00) Krasnoyarsk (UTC+08:00) Beijing, Chongqing, Hong Kong, Urumqi (UTC+08:00) Irkutsk (UTC+08:00) Kuala Lumpur, Singapore (UTC+08:00) Perth (UTC+08:00) Taipei (UTC+08:00) Ulaanbaatar (UTC+09:00) Osaka, Sapporo, Tokyo (UTC+09:00) Seoul (UTC+09:00) Yakutsk (UTC+09:30) Adelaide (UTC+09:30) Darwin (UTC+10:00) Brisbane (UTC+10:00) Canberra, Melbourne, Sydney (UTC+10:00) Guam, Port Moresby (UTC+10:00) Hobart (UTC+10:00) Vladivostok (UTC+11:00) Magadan, Solomon Is., New Caledonia (UTC+12:00) Auckland, Wellington (UTC+12:00) Coordinated Universal Time+12 (UTC+12:00) Fiji (UTC+12:00) Petropavlovsk-Kamchatsky (UTC+13:00) Nuku'alofa When I run it on a different local machine or my server I have this. <option value="(GMT) Casablanca">(GMT) Casablanca</option> <option value="(GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London">(GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London</option> <option value="(GMT) Monrovia, Reykjavik">(GMT) Monrovia, Reykjavik</option> <option value="(GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna">(GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna</option> <option value="(GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague">(GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague</option> <option value="(GMT+01:00) Brussels, Copenhagen, Madrid, Paris">(GMT+01:00) Brussels, Copenhagen, Madrid, Paris</option> <option value="(GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb">(GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb</option> <option value="(GMT+01:00) West Central Africa">(GMT+01:00) West Central Africa</option> <option value="(GMT+02:00) Amman">(GMT+02:00) Amman</option> <option value="(GMT+02:00) Athens, Bucharest, Istanbul">(GMT+02:00) Athens, Bucharest, Istanbul</option> <option value="(GMT+02:00) Beirut">(GMT+02:00) Beirut</option> <option value="(GMT+02:00) Cairo">(GMT+02:00) Cairo</option> <option value="(GMT+02:00) Harare, Pretoria">(GMT+02:00) Harare, Pretoria</option> <option value="(GMT+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius">(GMT+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius</option> <option value="(GMT+02:00) Jerusalem">(GMT+02:00) Jerusalem</option> <option value="(GMT+02:00) Minsk">(GMT+02:00) Minsk</option> <option value="(GMT+02:00) Windhoek">(GMT+02:00) Windhoek</option> <option value="(GMT+03:00) Baghdad">(GMT+03:00) Baghdad</option> <option value="(GMT+03:00) Kuwait, Riyadh">(GMT+03:00) Kuwait, Riyadh</option> <option value="(GMT+03:00) Moscow, St. Petersburg, Volgograd">(GMT+03:00) Moscow, St. Petersburg, Volgograd</option> <option value="(GMT+03:00) Nairobi">(GMT+03:00) Nairobi</option> <option value="(GMT+03:00) Tbilisi">(GMT+03:00) Tbilisi</option> <option value="(GMT+03:30) Tehran">(GMT+03:30) Tehran</option> <option value="(GMT+04:00) Abu Dhabi, Muscat">(GMT+04:00) Abu Dhabi, Muscat</option> <option value="(GMT+04:00) Baku">(GMT+04:00) Baku</option> <option value="(GMT+04:00) Port Louis">(GMT+04:00) Port Louis</option> <option value="(GMT+04:00) Yerevan">(GMT+04:00) Yerevan</option> <option value="(GMT+04:30) Kabul">(GMT+04:30) Kabul</option> <option value="(GMT+05:00) Ekaterinburg">(GMT+05:00) Ekaterinburg</option> <option value="(GMT+05:00) Islamabad, Karachi">(GMT+05:00) Islamabad, Karachi</option> <option value="(GMT+05:00) Tashkent">(GMT+05:00) Tashkent</option> <option value="(GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi">(GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi</option> <option value="(GMT+05:30) Sri Jayawardenepura">(GMT+05:30) Sri Jayawardenepura</option> <option value="(GMT+05:45) Kathmandu">(GMT+05:45) Kathmandu</option> <option value="(GMT+06:00) Almaty, Novosibirsk">(GMT+06:00) Almaty, Novosibirsk</option> <option value="(GMT+06:00) Astana, Dhaka">(GMT+06:00) Astana, Dhaka</option> <option value="(GMT+06:30) Yangon (Rangoon)">(GMT+06:30) Yangon (Rangoon)</option> <option value="(GMT+07:00) Bangkok, Hanoi, Jakarta">(GMT+07:00) Bangkok, Hanoi, Jakarta</option> <option value="(GMT+07:00) Krasnoyarsk">(GMT+07:00) Krasnoyarsk</option> <option value="(GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi">(GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi</option> <option value="(GMT+08:00) Irkutsk, Ulaan Bataar">(GMT+08:00) Irkutsk, Ulaan Bataar</option> <option value="(GMT+08:00) Kuala Lumpur, Singapore">(GMT+08:00) Kuala Lumpur, Singapore</option> <option value="(GMT+08:00) Perth">(GMT+08:00) Perth</option> <option value="(GMT+08:00) Taipei">(GMT+08:00) Taipei</option> <option value="(GMT+09:00) Osaka, Sapporo, Tokyo">(GMT+09:00) Osaka, Sapporo, Tokyo</option> <option value="(GMT+09:00) Seoul">(GMT+09:00) Seoul</option> <option value="(GMT+09:00) Yakutsk">(GMT+09:00) Yakutsk</option> <option value="(GMT+09:30) Adelaide">(GMT+09:30) Adelaide</option> <option value="(GMT+09:30) Darwin">(GMT+09:30) Darwin</option> <option value="(GMT+10:00) Brisbane">(GMT+10:00) Brisbane</option> <option value="(GMT+10:00) Canberra, Melbourne, Sydney">(GMT+10:00) Canberra, Melbourne, Sydney</option> <option value="(GMT+10:00) Guam, Port Moresby">(GMT+10:00) Guam, Port Moresby</option> <option value="(GMT+10:00) Hobart">(GMT+10:00) Hobart</option> <option value="(GMT+10:00) Vladivostok">(GMT+10:00) Vladivostok</option> <option value="(GMT+11:00) Magadan, Solomon Is., New Caledonia">(GMT+11:00) Magadan, Solomon Is., New Caledonia</option> <option value="(GMT+12:00) Auckland, Wellington">(GMT+12:00) Auckland, Wellington</option> <option value="(GMT+12:00) Fiji, Kamchatka, Marshall Is.">(GMT+12:00) Fiji, Kamchatka, Marshall Is.</option> <option value="(GMT+13:00) Nuku'alofa">(GMT+13:00) Nuku'alofa</option> <option value="(GMT-01:00) Azores">(GMT-01:00) Azores</option> <option value="(GMT-01:00) Cape Verde Is.">(GMT-01:00) Cape Verde Is.</option> <option value="(GMT-02:00) Mid-Atlantic">(GMT-02:00) Mid-Atlantic</option> <option value="(GMT-03:00) Brasilia">(GMT-03:00) Brasilia</option> <option value="(GMT-03:00) Buenos Aires">(GMT-03:00) Buenos Aires</option> <option value="(GMT-03:00) Georgetown">(GMT-03:00) Georgetown</option> <option value="(GMT-03:00) Greenland">(GMT-03:00) Greenland</option> <option value="(GMT-03:00) Montevideo">(GMT-03:00) Montevideo</option> <option value="(GMT-03:30) Newfoundland">(GMT-03:30) Newfoundland</option> <option value="(GMT-04:00) Atlantic Time (Canada)">(GMT-04:00) Atlantic Time (Canada)</option> <option value="(GMT-04:00) La Paz">(GMT-04:00) La Paz</option> <option value="(GMT-04:00) Manaus">(GMT-04:00) Manaus</option> <option value="(GMT-04:00) Santiago">(GMT-04:00) Santiago</option> <option value="(GMT-04:30) Caracas">(GMT-04:30) Caracas</option> <option value="(GMT-05:00) Bogota, Lima, Quito, Rio Branco">(GMT-05:00) Bogota, Lima, Quito, Rio Branco</option> <option value="(GMT-05:00) Eastern Time (US &amp; Canada)">(GMT-05:00) Eastern Time (US &amp; Canada)</option> <option value="(GMT-05:00) Indiana (East)">(GMT-05:00) Indiana (East)</option> <option value="(GMT-06:00) Central America">(GMT-06:00) Central America</option> <option value="(GMT-06:00) Central Time (US &amp; Canada)">(GMT-06:00) Central Time (US &amp; Canada)</option> <option value="(GMT-06:00) Guadalajara, Mexico City, Monterrey">(GMT-06:00) Guadalajara, Mexico City, Monterrey</option> <option value="(GMT-06:00) Saskatchewan">(GMT-06:00) Saskatchewan</option> <option value="(GMT-07:00) Arizona">(GMT-07:00) Arizona</option> <option value="(GMT-07:00) Chihuahua, La Paz, Mazatlan">(GMT-07:00) Chihuahua, La Paz, Mazatlan</option> <option value="(GMT-07:00) Mountain Time (US &amp; Canada)">(GMT-07:00) Mountain Time (US &amp; Canada)</option> <option value="(GMT-08:00) Pacific Time (US &amp; Canada)">(GMT-08:00) Pacific Time (US &amp; Canada)</option> <option value="(GMT-08:00) Tijuana, Baja California">(GMT-08:00) Tijuana, Baja California</option> <option value="(GMT-09:00) Alaska">(GMT-09:00) Alaska</option> <option value="(GMT-10:00) Hawaii">(GMT-10:00) Hawaii</option> <option value="(GMT-11:00) Midway Island, Samoa">(GMT-11:00) Midway Island, Samoa</option> <option value="(GMT-12:00) International Date Line West">(GMT-12:00) International Date Line West</option> They are different. Same line of code but one is GMT and one is UTC. How can I force it to be always the same? Also I want to have a default choice of "UTC" but I am not sure what the diff is between this (UTC-11:00) Coordinated Universal Time-11 and this (UTC-02:00) Coordinated Universal Time-02

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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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• Detecting cause of RuntimeException: Unable to stop activity

  - by Pentium10

  I have a really weird error, and I don't know what is causing this. It happens when I leave the Activity. 05-16 12:26:20.360: ERROR/AndroidRuntime(11648): Uncaught handler: thread main exiting due to uncaught exception 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): java.lang.RuntimeException: Unable to stop activity {com.myapk/com.myapk.modules.viewPairing}: java.lang.NullPointerException 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3596) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3674) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.app.ActivityThread.access$2800(ActivityThread.java:126) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1965) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.os.Handler.dispatchMessage(Handler.java:99) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.os.Looper.loop(Looper.java:123) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.app.ActivityThread.main(ActivityThread.java:4595) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at java.lang.reflect.Method.invokeNative(Native Method) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at java.lang.reflect.Method.invoke(Method.java:521) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at dalvik.system.NativeStart.main(Native Method) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): Caused by: java.lang.NullPointerException 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.app.Activity.performStop(Activity.java:3848) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3591) 05-16 12:26:20.400: ERROR/AndroidRuntime(11648): ... 11 more

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• Java .doc generation

  - by bozo

  Hi, anyone knows an easy method to generate mail merge .doc file from Java? So, I want to create a Word (95/97) document in Word, put some simple placeholders in it (only single value, no iterators and other advanced tags) like the ones used with mailmerge option, and then at runtime replace those placeholders with values from Java. One option is to use Jasperreports, but this would require that I create exact replica of non-trivial Word document in Jasper format, which is not easy and is hard to change later. Is there some method of filling placeholders in Word from Java, which does not require low-level document alteration with positioning and others low-level .doc tags from code, but something like this: docPreparer.fillPlaceholder('placeholder1', 'my real value from runtime'); Some CRMs do this via ActiveX control for internet explorer, and it works great (they use Word's mailmerge) but I need an all-Java solution. Ideas? Thanks, Bozo

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• Biometric implementation in Java application and Image Comparision

  - by harigm

  How do I compare the 2 images in Java based web application. I have installed the Biometric thumb reader, I need to read the user Thumb and compare it with his thumb image which is captured during the registration process. Initially I am storing the image in the Mysql as Blob. Else I can store that image in a separate folder as well Please suggest which is best way to do 1)Shall i Use the Java script 2)Is there any built in Java API to perform this

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• Getting problem in collision detection in Java Game

  - by chetans

  Hi I am developing Spaceship Game in which i am getting problem in collision detection of moving images Game has a spaceship and number of asteroids(obstacles) i want to detect the collision between them How can i do this?`package Game; import java.applet.Applet; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Image; import java.awt.MediaTracker; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.net.MalformedURLException; import java.net.URL; public class ThreadInApplet extends Applet implements KeyListener { private static final long serialVersionUID = 1L; Image[] asteroidImage; Image spaceshipImage; int[] XPosObst,YPosObst; int numberOfObstacles=0,XPosOfSpaceship,YPosOfSpaceship; int spaceButtnCntr=0,noOfObstaclesLevel=20; boolean gameStart=false,collideUp=false,collideDown=false,collideLeft=false,collideRight=false; private Image offScreenImage; private Dimension offScreenSize,d; private Graphics offScreenGraphics; int speedObstacles=1; String spaceshipImagePath="images/spaceship.png",obstacleImagepath="images/asteroid.png"; String buttonToStart="Press Space to start"; public void init() { try { asteroidImage=new Image[noOfObstaclesLevel]; XPosObst=new int[noOfObstaclesLevel]; YPosObst=new int[noOfObstaclesLevel]; XPosOfSpaceship=getWidth()/2-35; YPosOfSpaceship=getHeight()-100; spaceshipImage=getImage(new URL(getCodeBase(),spaceshipImagePath)); for(int i=0;i<noOfObstaclesLevel;i++) { asteroidImage[i]=getImage(new URL(getCodeBase(),obstacleImagepath)); XPosObst[i]=(int) (Math.random()*700); YPosObst[i]=0; } MediaTracker tracker = new MediaTracker (this); for(int i=0;i<noOfObstaclesLevel;i++) { tracker.addImage (asteroidImage[i], 0); } } catch (MalformedURLException e) { e.printStackTrace(); } setBackground(Color.black); addKeyListener(this); } public void paint(Graphics g) { g.setColor(Color.white); if(gameStart==false) { g.drawString(buttonToStart, (getWidth()/2)-60, getHeight()/2); } g.drawString("HEADfitted Solutions Pvt.Ltd.", (getWidth()/2)-80, getHeight()-20); for(int n=0;n<numberOfObstacles;n++) { if(n>0) g.drawImage(asteroidImage[n],XPosObst[n],YPosObst[n],this); } g.drawImage(spaceshipImage,XPosOfSpaceship,YPosOfSpaceship,this); } @SuppressWarnings("deprecation") public void update(Graphics g) { d = size(); if((offScreenImage == null) || (d.width != offScreenSize.width) || (d.height != offScreenSize.height)) { offScreenImage = createImage(d.width, d.height); offScreenSize = d; offScreenGraphics = offScreenImage.getGraphics(); } offScreenGraphics.clearRect(0, 0, d.width, d.height); paint(offScreenGraphics); g.drawImage(offScreenImage, 0, 0, null); } public void keyReleased(KeyEvent arg0){} public void keyTyped(KeyEvent arg0) {} Thread mainThread=new Thread() { synchronized public void run () { try { //System.out.println("in main thread"); if (gameStart==true) { moveObstacles.start(); if(collide()==false) { createObsThread.start(); } } } catch (Exception e) { e.printStackTrace(); } } }; Thread createObsThread=new Thread() { synchronized public void run () { if (spaceButtnCntr==1) { if (collide()==false) { for(int g=0;g<noOfObstaclesLevel;g++) { try { sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } numberOfObstacles++; } } } } }; Thread moveObstacles=new Thread() // Moving Obstacle images downwards after every 10 ms { synchronized public void run () { while(YPosObst[19]!=600) { if (collide()==false) { //createObsThread.start(); for(int l=0;l } repaint(); try { sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } } } }; public void keyPressed(KeyEvent e) { if(e.getKeyCode()==32) { gameStart=true; spaceButtnCntr++; if (spaceButtnCntr==1) { mainThread.start(); } } if(gameStart==true) { if(e.getKeyCode()==37 && collideLeft==false)//Spaceship movement left { new Thread () { synchronized public void run () { XPosOfSpaceship-=10; repaint(); } }.start(); } if(e.getKeyCode()==38 && collideUp==false)//Spaceship movement up { new Thread () { synchronized public void run () { YPosOfSpaceship-=10; repaint(); } }.start(); } if(e.getKeyCode()==39 && collideRight==false)//Spaceship movement right { new Thread () { synchronized public void run () { XPosOfSpaceship+=10; repaint(); } }.start(); } if(e.getKeyCode()==40 && collideDown==false)//Spaceship movement down { new Thread () { synchronized public void run () { YPosOfSpaceship+=10; repaint(); } }.start(); } } } /*public boolean collide() { int x0, y0, w0, h0, x2, y2, w2, h2; x0=XPosOfSpaceship; y0=YPosOfSpaceship; h0=spaceshipImage.getHeight(null); w0=spaceshipImage.getWidth(null); for(int i=0;i<20;i++) { x2=XPosObst[i]; y2=YPosObst[i]; h2=asteroidImage[i].getHeight(null); w2=asteroidImage[i].getWidth(null); if ((x0 > (x2 + w2)) || ((x0 + w0) < x2)) return false; System.out.println(x2+" "+y2+" "+h2+" "+w2); if ((y0 > (y2 + h2)) || ((y0 + h0) < y2)) return false; } return true; }*/ public boolean collide() { int x1,y1,x2,y2,x3,y3,x4,y4; //coordinates of obstacles int a1,b1,a2,b2,a3,b3,a4,b4; //coordinates of spaceship a1 =XPosOfSpaceship; b1=YPosOfSpaceship; a2=a1+spaceshipImage.getWidth(this); b2=b1; a3=a1; b3=b1+spaceshipImage.getHeight(this); a4=a2; b4=b3; for(int a=0;a if(x1>=a1 && x1<=a2 && x1<=b3 && x1>=b1) return (true); if(x2>=a1 && x2<=a2 && x2<=b3 && x2>=b1) return(true); //********checking asteroid touch spaceship from up direction******** if(y3==b1 && x4>=a1 && x4<=a2) { collideUp = true; return(true); } if(y3==b1 && x3>=a1 && x3<=a2) { collideUp = true; return(true); } //********checking asteroid touch spaceship from left direction****** if(x2==a1 && y4>=b1 && y4<=b3) { collideLeft=true; return(true); } if(x2==a1 && y2>=b1 && y2<=b3) { collideLeft=true; return(true); } //********checking asteroid touch spaceship from right direction***** if(x1==a2 && y3>=b2 && y3<=b4) { collideRight=true; return(true); } if(x1==a2 && y1>=b2 && y1<=b4) { collideRight=true; return(true); } //********checking asteroid touch spaceship from down direction***** if(y1==b3 && x2>=a3 && x2<=a4) { collideDown=true; return(true); } if(y1==b3 && x1>=a3 && x1<=a4) { collideDown=true; return(true); } else { collideUp=false; collideDown=false; collideLeft=false; collideRight=false; } } return(false); } } `

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• Abstract class in Java

  - by keyur

  What is an "abstract class" in Java?

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• Advertising API for Java ME applications?

  - by Wonil

  Hello, I know AdMob is not for Java ME. Do you know any other advertising API or services that can be used in Java ME application? It might be really good if I can earn some money with my free Java ME applications.

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• how to convert tis-620 string to utf-8 string in java

  - by gorgai

  how to convert tis-620 string to utf-8 string in java

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• Communicating between PHP and Java using ActiveMQ/Stomp

  - by scompt.com

  Background I have two services that need to communicate with each other over a message queue. One is a legacy service written in PHP and the other is in Java. Sooner than later, the PHP service will be rewritten in Java. The current way they communicate with each other is to write to a shared database, which the other service polls. This is what I'm trying to get away from and replace with a message queue. Problem The communication I'm working on right now is from the PHP service to the Java service. It needs to send a relatively complex object (strings and and integers and lists and maps of strings and integers). Ideally, the solution would be workable in PHP and ideal in Java, as that's going to be the legacy of this project. Possible Solutions 1.

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