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• Capturing Set Behavior with Mutating Elements

  - by Carl

  Using the Guava library, I have the following situation: SetMultimap<ImmutableFoo, Set<Foo>> setMM = HashMultimap.create(); Set<Foo> mask = Sets.newHashSet(); // ... some iteration construct { setMM.put(ImmutableFoo1, Sets.difference(SomeSetFoo1,mask)); setMM.put(ImmutableFoo1, Sets.difference(SomeSetFoo2,mask)); mask.add(someFoo); } that is, the same iteration to create the setMM is also used to create the mask - this can of course result in changes to hashCode()s and create duplicates within the SetMultimap backing. Ideally, I'd like the duplicates to drop without me having to make it happen, and avoid repeating the iteration to separately construct the multimap and mask. Any easy libraries/Set implementations to make that happen? Alternatively, can you identify a better way to drop the duplicates than: for (ImmutableFoo f : setMM.keySet()) setMM.putAll(f,setMM.removeAll(f)); revisiting the elements is probably not a performance problem, since I could combine a separate filter operation that needs to visit all the elements anyway.

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• Client Web Service call over SSL using Apache Axis

  - by java_pill

  I'm using Apache Axis 1.5.1 to code a web service client connecting to a service over SSL. My application is running in Tomcat with SSL configuration setup in JKS. However, when I connect to the server, the connection is failing because the cert from our client is not being sent to the server. Is this something that has to be set in the client through code? Also note that the server does not need any user name or password authentication. With SSL turned off, everything works fine. Thanks,

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• Netbeans can't find running Tomcat

  - by Yurish

  Hi! I'm running Tomcat inside of Netbeans. I added Tomcat server(not bundled with Netbeans) to Servers in Netbeans. But, when i'm trying to run Tomcat, it starts(i can visit Tomcat home page), but Netbeans can't find it running. Where is the problem? No stacktrace in Tomcat. When i'm deploying my project`s war in this Tomcat manually, everything works, but i need to deploy it automatically from Netbeans. Configuration: Netbeans 6.8 + Tomcat 6.0.26 + JSF and Hibernate project.

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• Setting refresh-policies in Ehcache

  - by Alex Ciminian

  Is there any to specify a data refresh policy in Ehcache? I am currently migrating an application from OSCache to Ehcache and I can't seem to find any way to specify when an element needs refreshing, besides setting timeToIdle and timeToLive. What I want is: on accessing an element from the cache, check with it's associated resource to see if it was updated later than the lastUpdateTime of the cache element. If yes, refresh the cache; else serve the content from the cache. In OSCache this was done by catching NeedsRefreshExceptions and setting custom refresh policies for the elements. I've been digging around in the docs for a while now, but I wasn't able to find any methods or examples of how I could accomplish this in Ehcache. Any help would be appreciated :). Alex

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• How did I center a jpanel in a jpanel with netbeans?

  - by Jim Nordlander

  With Netbeans I've succeded center a jpanel with fixed size, within an other jpanel. Now I can't repeat it - only copy it. How did I do? (or should I do to center x and y a jpanel with fixed size in another jpanel). The result differs in code: Working - search for .addContainerGap( and see next not working: javax.swing.GroupLayout center3Layout = new javax.swing.GroupLayout(center3); center3.setLayout(center3Layout); center3Layout.setHorizontalGroup( center3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 1064, Short.MAX_VALUE) .addGroup(center3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(center3Layout.createSequentialGroup() .addContainerGap(30, Short.MAX_VALUE) .addComponent(mainPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(30, Short.MAX_VALUE))) ); center3Layout.setVerticalGroup( center3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 650, Short.MAX_VALUE) .addGroup(center3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(center3Layout.createSequentialGroup() .addContainerGap(23, Short.MAX_VALUE) .addComponent(mainPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(23, Short.MAX_VALUE))) ); Not working - search for .addGap compared with above working. javax.swing.GroupLayout center2Layout = new javax.swing.GroupLayout(center2); center2.setLayout(center2Layout); center2Layout.setHorizontalGroup( center2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 1073, Short.MAX_VALUE) .addGroup(center2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(center2Layout.createSequentialGroup() .addGap(0, 34, Short.MAX_VALUE) .addComponent(mainPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(0, 35, Short.MAX_VALUE))) ); center2Layout.setVerticalGroup( center2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 654, Short.MAX_VALUE) .addGroup(center2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(center2Layout.createSequentialGroup() .addGap(0, 25, Short.MAX_VALUE) .addComponent(mainPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(0, 25, Short.MAX_VALUE))) ); I've looked side by side in properties etc - please help! :)

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• GridLayout with single column

  - by Albinoswordfish

  Right now I'm trying to use a GridLayout with only a single column. However I'm having a problem where I don't want the object, in this case a JButton, to be stretched the entire width of the JPanel that it's on. Is there a way to decrease the width of the JButton so that it does not stretch the entire width of the JPanel. I've tried using setPreferredSize and setSize with no results. Is this just the way GridLayout works or is there something I'm missing?

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• Google App Engine - Uploading blobs and authentication

  - by Keyur

  (I tried asking this on the GAE forums but didn't get an answer so am trying it here.) Currently to upload blobs, the app engine's blob store service creates a unique one- time URL that a user can post blobs to. My requirement is that I only want authenticated / authorized users to post blobs in my application. I can achieve this currently if the page that includes the multipart form to upload blobs is in my application. However, I am looking to providing a "REST API" for my users to upload their blobs. While it is true that the one-time nature of the upload URL mitigates the chances of rogue use but it's still possible. I was wondering if there is anyone on the app engine team here that can consider a feature where developers can register an upload listener. (Or if there is already a way, I'll be all ears). A standard servlet filter could also potentially do the job. This will give us an opportunity to authenticate / validate / decorate requests before the request gets forwarded to the blob store service. Thanks, Keyur

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• Why does ActiveMQ hold messages that should be deleted from Topic?

  - by rauch

  I use ActiveMQ as Notification System(Pub/Sub model). On server: if any changes of data occur, Server send this updated data (File) to Topic using BlobMessages. There are few Clients, that subscribe on this Topic and get updated File if it exsist in Topic. The problem is that all of BlobMessages, that were sent to Topic, are hold by ActiveMQ all time. this.producer = new ProducerTool.Builder("tcp://localhost:61616?jms.blobTransferPolicy.uploadUrl=http://localhost:8161/fileserver/", "ServerProdTopic").topic(true) .transacted(false).durable(false).timeToLive(10000L).build(); this.consumer = new ConsumerTool.Builder("tcp://localhost:61616", "ServerConsTopic").topic(true) .transacted(false).durable(false).build(); consumer.setMessageListener(this); The File is sent: connection = createConnection(); session = createSession(connection); producer = createProducer(session); BlobMessage blobMsg = ((ActiveMQSession) session).createBlobMessage(resource); blobMsg.setStringProperty("sourceName", resource.getName()); producer.send(blobMsg); if (transacted) { System.out.println("Producer Committing..."); session.commit(); } Where createProducer is: protected Connection createConnection() throws JMSException, Exception { ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url); //connectionFactory.getBlobTransferPolicy().setUploadUrl("http://localhost:8161/fileserver/"); Connection connection = connectionFactory.createConnection(); connection.start(); ((ActiveMQConnection) connection).setCopyMessageOnSend(false); return connection; } All, that could be useful I set as need: Session.AUTO_ACKNOWLEDGE; Non-Durable Subscription; TimeToLive = 9000; JMSDeliveryMode = Non-Persistent; What I have at runtime: in ActiveMQ directory: ~/apache-activemq-5.3.0/webapps/fileserver/ tere are all File, that where delivered and not delivered to Subscribers. Why? Sometimes Server send Big Files about 1 GB....And even this Files are hold at that directory, Even after stopping Subscribers(Clients), Publisher(Server) and ActiveMQ Broker.

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• Apache with JBOSS using AJP (mod_jk) giving spikes in thread count.

  - by Beginner

  We used Apache with JBOSS for hosting our Application, but we found some issues related to thread handling of mod_jk. Our website comes under low traffic websites and has maximum 200-300 concurrent users during our website's peak activity time. As the traffic grows (not in terms of concurrent users, but in terms of cumulative requests which came to our server), the server stopped serving requests for long, although it didn't crash but could not serve the request till 20 mins. The JBOSS server console showed that 350 thread were busy on both servers although there was enough free memory say, more than 1-1.5 GB (2 servers for JBOSS were used which were 64 bits, 4 GB RAM allocated for JBOSS) In order to check the problem we were using JBOSS and Apache Web Consoles, and we were seeing that the thread were showing in S state for as long as minutes although our pages take around 4-5 seconds to be served. We took the thread dump and found that the threads were mostly in WAITING state which means that they were waiting indefinitely. These threads were not of our Application Classes but of AJP 8009 port. Could somebody help me in this, as somebody else might also got this issue and solved it somehow. In case any more information is required then let me know. Also is mod_proxy better than using mod_jk, or there are some other problems with mod_proxy which can be fatal for me if I switch to mod__proxy? The versions I used are as follows: Apache 2.0.52 JBOSS: 4.2.2 MOD_JK: 1.2.20 JDK: 1.6 Operating System: RHEL 4 Thanks for the help.

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• from http to https

  - by Chez

  I have got a simple web app. A web page with a form to submit. A servlet on the serverside. It works. I am now asked to change it so that the address of the form changes from http://www.example.com/myForm.html to https://www.example.com/myForm.html What are the steps to do this ? do I have to change my servlet ? my deployment ? my web page ? all of them ? Thanks

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• problem while rerendering the form in jsf1.1?

  - by Hari

  In my application I have to show a panel on same page after click of a button. For that I am passing my form id on rerender attribute of the button. the funtionalty is working fine but the problem is the whole form get resized and all component come close to each other. the same page i refresh the same page, then it look's fine, or if i redirect the same page again from my bean it stays fine. but i should not follow this appoach.

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• Amount of data stored in session

  - by srinannapa

  What technique should we use to make the httpsession object not loaded heavily with data. Example : Request 1 ---- httpSession loaded with an arraylist of 50,000 different objects. session.setAttribute("data",arraylist); Request 2 ---- httpSession loaded with an arraylist of 40,000 different objects. session.setAttribute("data",arraylist); Assume the server is loaded heavily with multiple sessions and huge data in them. Let us say from my above example request1..1000 at a time. Which means 1000 session objects with huge data. What is the alternate way to solve instead storing them in session like this?

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• How to define index by several columns in hibernate entity?

  - by foobar

  Morning. I need to add indexing in hibernate entity. As I know it is possible to do using @Index annotation to specify index for separate column but I need an index for several fields of entity. I've googled and found jboss annotation @Table, that allows to do this (by specification). But (I don't know why) this functionality doesn't work. May be jboss version is lower than necessary, or maybe I don't understant how to use this annotation, but... complex index is not created. Why index may not be created? jboss version 4.2.3.GA Entity example: package somepackage; import org.hibernate.annotations.Index; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity @org.hibernate.annotations.Table(appliesTo = House.TABLE_NAME, indexes = { @Index(name = "IDX_XDN_DFN", columnNames = {House.XDN, House.DFN} ) } ) public class House { public final static String TABLE_NAME = "house"; public final static String XDN = "xdn"; public final static String DFN = "dfn"; @Id @GeneratedValue private long Id; @Column(name = XDN) private long xdn; @Column(name = DFN) private long dfn; @Column private String address; public long getId() { return Id; } public void setId(long id) { this.Id = id; } public long getXdn() { return xdn; } public void setXdn(long xdn) { this.xdn = xdn; } public long getDfn() { return dfn; } public void setDfn(long dfn) { this.dfn = dfn; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } } When jboss/hibernate tries to create table "house" it throws following exception: Reason: org.hibernate.AnnotationException: @org.hibernate.annotations.Table references an unknown table: house

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• SwarmCache Hibernate configuration

  - by archer

  Could anyone hint me how to configure SwarmCache for Hibernate to work in cluster (distributed cache)? Probably there are some other alternatives (please, don't suggest JBoss Cache)?

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• How to generate custom JSESSIONID, based on some hash of user's data in order to replicate session

  - by Shaman

  Is it possible to override Tomcat's embedded generator of JSESSIONID, to be able to create custom values of this cookie, based on user's login? Why do I need this: I have a load balancer with "sticky sessions", configured to route requests with the same JSESSIONID to the same server, and I want to prevent situation, when same user can start two different sessions on different servers.

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• Joda: what's the difference between Period, Interval and Duration?

  - by Gerard

  Why do we need three classes? Which one performs better? Why is dividing a Period or Duration or Interval instance not implemented? E.g. p = p.divideBy(2);

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• Parsing xml with dom4j or jdom or anyhow

  - by c0mrade

  Hello, I wanna read feed entries and I'm just stuck now. Take this for example : http://stackoverflow.com/feeds/question/2084883 lets say I wanna read all the summary node value inside each entry node in document. How do I do that? I've changed many variations of code this one is closest to what I want to achieve I think : Element entryPoint = document.getRootElement(); Element elem; for(Iterator iter = entryPoint.elements().iterator(); iter.hasNext();){ elem = (Element)iter.next(); System.out.println(elem.getName()); } It goes trough all nodes in xml file and writes their name. Now what I wanted to do next is if(elem.getName() == "entry") to get only the entry nodes, how do I get elements of the entry nodes, and how to get let say summary and its value? tnx

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• How to programmatically check availibilty of internet connection in Android?

  - by Fahad

  Hi! I want to check programmatically whether there is an internet connection in android phone/emulator. So that once I am sure that an internet connection is present then I'll make a call to the internet. So its like "Hey emulator! If you have an internet connection, then please open this page, else doSomeThingElse();" hope you get the idea. I would highly appreciate a quick response I need it quite early. regards Fahad Ali Shaikh

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• jdb conditional breakpoint

  - by wizard@

  I remote debug my application using JDB, just JDB, no IDEs, is there a way in jdb to set a conditional breakpoint? eg: stop at MyClass:80 when mystr.equals("abc")

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• Adding a JLabel to JLayeredPane from event listener not dragging.

  - by Cody

  Ok, So for some reason When I add components to a JLayeredPane in its constructor: JLabel label = new JLabel(); label.setSize(100,100); label.setText("This works"); add(label); It works perfectly fine, but If a add it later in the JLayeredPane's parent EDT it doesnt let me move the objects around but they let me see the objects. Adding from EDT: JLabel label = new JLabel(); label.setToolTipText(url.getHost()); label.setIcon(icon); label.setBorder(new LineBorder(null)); label.setSize(icon.getIconWidth(), icon.getIconHeight()); dressFrame.layeredPane.add(label, JLayeredPane.DRAG_LAYER); Dragging method: Component c = findComponentAt(e.getX(), e.getY()); if (c instanceof JLayeredPane) { pieceSelected = false; return; } Point parentLocation = c.getLocation(); xAdjustment = parentLocation.x - e.getX(); yAdjustment = parentLocation.y - e.getY(); movingPiece = c; movingPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment); pieceSelected = true;

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• getting incorrect error even if the condition is fulfilled

  - by Tapan Desai

  I am trying to show the message based on the text shown on webpage after a particular action. If the webpage contains text MESSAGE HAS BEEN SUBMITTED SUCCESSFULLY, I want to print Message sent successfully on the screen otherwise MESSAGE SENDING FAILED. Everything is working fine but for one thing. PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(sendConnection.getOutputStream()), true); printWriter.print(sendContent); printWriter.flush(); printWriter.close(); //Reading the returned web page to analyse whether the operation was sucessfull BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(sendConnection.getInputStream())); StringBuilder SendResult = new StringBuilder(); String line; while ((line = bufferedReader.readLine()) != null) { SendResult.append(line); } if (SendResult.toString().contains("MESSAGE HAS BEEN SUBMITTED SUCCESSFULLY")) { System.out.println("Message sent to " + phoneNumber + " successfully."); } else { System.err.println("Message could not send to " + phoneNumber + ". Also check login credentials"); } bufferedReader.close(); The problem is that even if the webpage contains the text MESSAGE HAS BEEN SUBMITTED SUCCESSFULLY, the condition always goes into ELSE part and show MESSAGE SENDING FAILED but thats not true because the message has been sent and i see the MESSAGE HAS BEEN SUBMITTED SUCCESSFULLY on the webpage. Can anyone tell me where am i going wrong?

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• JDBC/OSGi and how to dynamically load drivers without explicitly stating dependencies in the bundle?

  - by Chris

  Hi, This is a biggie. I have a well-structured yet monolithic code base that has a primitive modular architecture (all modules implement interfaces yet share the same classpath). I realize the folly of this approach and the problems it represents when I go to deploy on application servers that may have different conflicting versions of my library. I'm dependent on around 30 jars right now and am mid-way though bnding them up. Now some of my modules are easy to declare the versioned dependencies of, such as my networking components. They statically reference classes within the JRE and other BNDded libraries but my JDBC related components instantiate via Class.forName(...) and can use one of any number of drivers. I am breaking everything up into OSGi bundles by service area. My core classes/interfaces. Reporting related components. Database access related components (via JDBC). etc.... I wish for my code to be able to still be used without OSGi via single jar file with all my dependencies and without OSGi at all (via JARJAR) and also to be modular via the OSGi meta-data and granular bundles with dependency information. How do I configure my bundle and my code so that it can dynamically utilize any driver on the classpath and/or within the OSGi container environment (Felix/Equinox/etc.)? Is there a run-time method to detect if I am running in an OSGi container that is compatible across containers (Felix/Equinox/etc.) ? Do I need to use a different class loading mechanism if I am in a OSGi container? Am I required to import OSGi classes into my project to be able to load an at-bundle-time-unknown JDBC driver via my database module? I also have a second method of obtaining a driver (via JNDI, which is only really applicable when running in an app server), do I need to change my JNDI access code for OSGi-aware app servers?

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• JMS have javax.jms.InvalidDestinationException when client stop working

  - by Tran

  I use JMS for sending requests from a client to a server. My client sends a request to the server. While the server is working with my request, my client stops (network problem) before the server finishes. When the server is finished, it'll return to the client, but the server can't see the client which sent the request to server, at which point, the server will return an exception in log file. The exception is : javax.jms.InvalidDestinationException: Cannot publish to a deleted Destination: temp-queue://ID:PC0092-49463-1344231871819-0:0:9 [^] My question is: what do I need to do in this case? Can I catch or disable this exception? And how can I do it? (Sorry, If my english is not good.)

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• Testing JavaMail Related Modules

  - by Hamza Yerlikaya

  Part of my application depends on JavaMail, moving arranging messages etc. Is it possible to test this module without firing a IMAP server to run the tests on? I am always stuck when it comes to testing stuff that depends on external servers or modules.

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• Advantages/disadvantages of Glassfish v3 Prelude vs Springsource dm server for Web applications?

  - by cletus

  Both of these appservers are at least in part OSGI based. One (Glassfish) is obviously J2EE while the other isn't. Now I'm at the stage of choosing a platform for a new project and the natural choice is Glassfish v3 Prelude. This does raise the issue of perhaps we should be using S2AP instead. The question then is this: does the springsource dm server offer any compelling reason to use it over Glassfish? And vice versa.

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