java-programmer >>How do you access your computer's time using Java?

How do you access your computer's time using Java?

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- 1
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    The program is a board game - the user chooses a building from a panel,
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    Game (main object):
    ....
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    { Thread.yield(); }
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    chooseResource is selected.
    So, the user clicks one of these buildings, which activates the
    following code, which is where the freeze occurs:
    
    String r = Game.game.chooseResource():
    state = Game.chooseResource;
    resource = "";
    while(resource.length()==0)
    Thread.yield();
    return resource;
    
    Now chooseResource does work in any other context - resource gets set
    by a mouseClicked event handler in a panel out there. But at this
    point, the GUI stops responding. The playerMessage never gets printed,
    and the click event never gets triggered. I did some investigating,
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    but even so, the cause of this behavior is beyond me. Any suggestions
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    programs with and where can i download it...
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    Where MITs/Berkeleys/IITs/Caltechs/Xerox Parcs CSEEs
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    I have a class like this:
    
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    int globalID;
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    I have an array of these.
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    CustomerOrder o = index.get(123)
    
    I could modify my class to be:
    
    class CustomerOrder {
    Integer globalID;
    ...
    }
    
    Perhaps it is my C++ background, but the idea of allocating an object for every
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    I figure a HashMap is the right tool of choice, e.g.:
    
    HashMap<Integer, CustomerOrder> index = new ...
    
    Has anyone out there already written a modified hashmap class that uses int as
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    Thanks for any tips :)
    
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    server,servername,username ,password);
    forgive me if they r not in the same order.now my question is wat is
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    Thanks in Advance.
    Srinivas Reddy Thatiparthy.
- 8
  - Eclipse bug?Eclipse bug? Using most recent version (as of a couple weeks ago,
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    responding -- or at least it is really sluggish if you try to use it
    again, and not just for a short time, but until you quit and restart it.
- 8
  - message Driven bean problemhi,
    
    i am trying to design an EJB application using session , entity and
    message beans
    
    it's a messaging board , a user can add a message , reply to a
    message , and delete the message
    
    when glasfish is running more than one application,
    
    the board client side keeps calling the wrong jms\
    
    // the addTopic class
    package web;
    
    import ejb.Topic;
    import java.io.*;
    
    import java.util.Date;
    import javax.annotation.Resource;
    import javax.jms.Connection;
    import javax.jms.ConnectionFactory;
    import javax.jms.JMSException;
    import javax.jms.MessageProducer;
    import javax.jms.ObjectMessage;
    import javax.jms.Queue;
    import javax.jms.Session;
    import javax.servlet.*;
    import javax.servlet.http.*;
    
    public class AddTopic extends HttpServlet {
    
    @Resource(mappedName = "jms/BoardTopicFactory")
    private ConnectionFactory connectionFactorys = null;
    @Resource(mappedName = "jms/BoardTopic")
    private Queue queue = null;
    private Connection connection = null;
    private Session session = null;
    
    @Override
    protected void doGet(HttpServletRequest request,
    HttpServletResponse response)
    throws ServletException, IOException {
    
    try {
    try {
    // creating a connection
    connection = connectionFactorys.createConnection();
    session = connection.createSession(false,
    Session.AUTO_ACKNOWLEDGE);
    MessageProducer messageProducer =
    session.createProducer(queue);
    
    ObjectMessage message = session.createObjectMessage();
    
    Topic topic = new Topic();
    // getting and setting all attributes required for the
    topic
    topic.setTopicDate(new Date());
    // topic name validation , if empty , do not add it to
    the database
    if (request.getParameter("topicName").equals("")) {
    } else {
    
    topic.setTopicName(request.getParameter("topicName"));
    
    message.setObject(topic);
    messageProducer.send(message);
    
    messageProducer.close();
    // connection.close();
    }
    } finally {
    if (session != null) {
    session.close();
    }
    if (connection != null) {
    connection.close();
    }
    }
    } catch (JMSException ex) {
    ex.printStackTrace();
    }
    
    getServletConfig().getServletContext().getRequestDispatcher("/
    index.jsp").forward(request, response);
    }
    
    @Override
    protected void doPost(HttpServletRequest request,
    HttpServletResponse response)
    throws ServletException, IOException {
    doGet(request, response);
    }
    
    /**
    * Returns a short description of the servlet.
    */
    @Override
    public String getServletInfo() {
    return "Short description";
    }
    // </editor-fold>
    }
    
    ----------------------------------------------------------------------------------------------------
    ///the jms class
    
    package ejb;
    
    import javax.annotation.Resource;
    import javax.ejb.ActivationConfigProperty;
    import javax.ejb.MessageDriven;
    import javax.ejb.MessageDrivenContext;
    import javax.jms.JMSException;
    import javax.jms.Message;
    import javax.jms.MessageListener;
    import javax.jms.ObjectMessage;
    import javax.persistence.EntityManager;
    import javax.persistence.PersistenceContext;
    
    @MessageDriven(mappedName = "jms/BoardTopic", activationConfig = {
    @ActivationConfigProperty(propertyName = "acknowledgeMode",
    propertyValue = "Auto-acknowledge"),
    @ActivationConfigProperty(propertyName = "destinationType",
    propertyValue = "javax.jms.Queue")
    })
    public class BoardTopicBean implements MessageListener {
    
    @PersistenceContext
    private EntityManager em;
    @Resource
    MessageDrivenContext mdc;
    
    public BoardTopicBean() {
    }
    
    public void onMessage(Message message) {
    ObjectMessage msg = null;
    try {
    msg = (ObjectMessage) message;
    
    persist(msg.getObject());
    
    } catch (JMSException e) {
    e.printStackTrace();
    mdc.setRollbackOnly();
    } catch (Throwable te) {
    te.printStackTrace();
    }
    }
    
    public void persist(Object object) {
    
    // save the object (MessageTable or Topic)
    em.persist(object);
    
    // if the object is a MessageTable then add this newly created/
    persisted object to the list of messages in the topic
    if (object instanceof MessageTable) {
    MessageTable msg = (MessageTable) object;
    Topic topic = msg.getTopic();
    
    if (topic == null) {
    em.remove(msg);
    } else {
    topic = em.find(Topic.class, topic.getId());
    topic.getMessages().add(msg);
    em.merge(topic);
    }
    } else {
    System.out.println("Wrong type in
    merge..................");
    }
    }
    }
    ----------------------------------------------------------------------------------------------------------------------
    some of the exceptions thrown to the console
    
    DirectConsumer:Caught Exception delivering
    messagecom.sun.messaging.jmq.io.Packet cannot be cast to
    com.sun.messaging.jms.ra.DirectPacket
    MQJMSRA_DM4001: :Exception:ObjectMessage.getObject()DeSerializing
    object::message=ejb.Topic
    javax.jms.MessageFormatException:
    MQJMSRA_DM4001: :Exception:ObjectMessage.getObject()DeSerializing
    object::message=ejb.Topic
    at
    com.sun.messaging.jms.ra.DirectObjectPacket.getObject(DirectObjectPacket.java:
    169)
    at ejb.HockeyMessagesBean.onMessage(HockeyMessagesBean.java:
    34)
    at sun.reflect.GeneratedMethodAccessor140.invoke(Unknown
    Source)
    at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
    25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
    com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:
    1067)
    at
    com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:176)
    at
    com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:
    2895)
    at
    com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:
    3986)
    at
    com.sun.ejb.containers.MessageBeanContainer.deliverMessage(MessageBeanContainer.java:
    1111)
    at
    com.sun.ejb.containers.MessageBeanListenerImpl.deliverMessage(MessageBeanListenerImpl.java:
    74)
    at
    com.sun.enterprise.connectors.inflow.MessageEndpointInvocationHandler.invoke(MessageEndpointInvocationHandler.java:
    179)
    at $Proxy52.onMessage(Unknown Source)
    at
    com.sun.messaging.jms.ra.OnMessageRunner.run(OnMessageRunner.java:258)
    at
    com.sun.enterprise.connectors.work.OneWork.doWork(OneWork.java:76)
    at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl
    $WorkerThread.run(ThreadPoolImpl.java:555)
    Caused by: java.lang.ClassNotFoundException: ejb.Topic
    at
    com.sun.enterprise.loader.EJBClassLoader.findClassData(EJBClassLoader.java:
    718)
    at
    com.sun.enterprise.loader.EJBClassLoader.findClass(EJBClassLoader.java:
    631)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:
    319)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at com.sun.messaging.jms.ra.DirectObjectPacket
    $ObjectInputStreamWithContextLoader.resolveClass(DirectObjectPacket.java:
    301)
    at
    java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:
    1575)
    at
    java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
    at
    java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
    1732)
    at
    java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:
    351)
    at
    com.sun.messaging.jms.ra.DirectObjectPacket.getObject(DirectObjectPacket.java:
    155)
    ... 15 more
    DirectConsumer:Caught Exception delivering
    messagecom.sun.messaging.jmq.io.Packet cannot be cast to
    com.sun.messaging.jms.ra.DirectPacket
    MQJMSRA_DM4001: :Exception:ObjectMessage.getObject()DeSerializing
    object::message=ejb.HockeyEntity
    javax.jms.MessageFormatException:
    MQJMSRA_DM4001: :Exception:ObjectMessage.getObject()DeSerializing
    object::message=ejb.HockeyEntity
    at
    com.sun.messaging.jms.ra.DirectObjectPacket.getObject(DirectObjectPacket.java:
    169)
    at ejb.BoardTopicBean.onMessage(BoardTopicBean.java:33)
    at sun.reflect.GeneratedMethodAccessor146.invoke(Unknown
    Source)
    at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
    25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
    com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:
    1067)
    at
    com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:176)
    at
    com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:
    2895)
    at
    com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:
    3986)
    at
    com.sun.ejb.containers.MessageBeanContainer.deliverMessage(MessageBeanContainer.java:
    1111)
    at
    com.sun.ejb.containers.MessageBeanListenerImpl.deliverMessage(MessageBeanListenerImpl.java:
    74)
    at
    com.sun.enterprise.connectors.inflow.MessageEndpointInvocationHandler.invoke(MessageEndpointInvocationHandler.java:
    179)
    at $Proxy56.onMessage(Unknown Source)
    at
    com.sun.messaging.jms.ra.OnMessageRunner.run(OnMessageRunner.java:258)
    at
    com.sun.enterprise.connectors.work.OneWork.doWork(OneWork.java:76)
    at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl
    $WorkerThread.run(ThreadPoolImpl.java:555)
    Caused by: java.lang.ClassNotFoundException: ejb.HockeyEntity
    at
    com.sun.enterprise.loader.EJBClassLoader.findClassData(EJBClassLoader.java:
    718)
    at
    com.sun.enterprise.loader.EJBClassLoader.findClass(EJBClassLoader.java:
    631)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:
    319)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at com.sun.messaging.jms.ra.DirectObjectPacket
    $ObjectInputStreamWithContextLoader.resolveClass(DirectObjectPacket.java:
    301)
    at
    java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:
    1575)
    at
    java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
    at
    java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
    1732)
    at
    java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:
    351)
    at
    com.sun.messaging.jms.ra.DirectObjectPacket.getObject(DirectObjectPacket.java:
    155)
    ... 15 more
    DirectConsumer:Caught Exception delivering
    messagecom.sun.messaging.jmq.io.Packet cannot be cast to
    com.sun.messaging.jms.ra.DirectPacket
    MQJMSRA_DM4001: :Exception:ObjectMessage.getObject()DeSerializing
    object::message=ejb.HockeyEntity
    
    -----------------------
    
    any idea guys???
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    Other than using JSplitPane to create a resizable JPanel, how can I make
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    Message posted via JavaKB.com
    http://www.javakb.com/Uwe/Forums.aspx/java-jvm/200505/1
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Author

Message

sambitmukherjee

Posted: 2004-10-3 20:29:00

Top

java-programmer, How do you access your computer's time using Java? What is the way of getting your system's current time(as shown in the
system tray in Windows) in Java?
Thanks.

Andrew Thompson

Posted: 2004-10-3 20:43:00

Top

java-programmer >> How do you access your computer's time using Java? On 3 Oct 2004 05:28:43 -0700, Sambit Mukherjee wrote:

> What is the way of getting your system's current time ..

<http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html#currentTimeMillis()>

>...(as shown in the system tray in Windows) ..

<http://java.sun.com/j2se/1.5.0/docs/api/java/util/Date.html>
<http://java.sun.com/j2se/1.5.0/docs/api/java/text/DateFormat.html>

HTH

--
Andrew Thompson
http://www.PhySci.org/codes/ Web & IT Help
http://www.PhySci.org/ Open-source software suite
http://www.1point1C.org/ Science & Technology
http://www.lensescapes.com/ Images that escape the mundane

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    There's also a server-side page type thingy (like JSP) but with
    much cleaner syntax (and easy typing).
    
    Enjoy !
- 14
  - Problem with RMI in LinuxI'm a newbie in the RMI programation.
    I downloaded the sample code in Java tutorial in java.sun.com and
    tried to compiled it. First, I compiled the interface class and was
    going to compile the stub and skeleton. However, after typing "rmic -d
    . engine.ComputeEngine" the following exception appeared:
    
    ComputeEngine_Stub.java:40: error:Syntax error: found '{'
    java.lang.Exception: exited with errorcode 1
    at java.lang.Throwable.fillInStackTrace(Throwable.java:native)
    at java.lang.Throwable.<init>(Throwable.java:38)
    at java.lang.Exception.<init>(Exception.java:24)
    at kaffe.tools.compiler.Compiler_kjc.compile(Compiler_kjc.java:53) at
    kaffe.rmi.rmic.RMIC.compile(RMIC.java:828)
    at kaffe.rmi.rmic.RMIC.processClass(RMIC.java:91) at
    kaffe.rmi.rmic.RMIC.run(RMIC.java:74) at
    kaffe.rmi.rmic.RMIC.main(RMIC.java:53)
    
    I'm working with the lastest version of jdk for Linux.
    Can you help me please??????
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