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• Interpolating Large Datasets On the Fly

  - by Karl

  Interpolating Large Datasets I have a large data set of about 0.5million records representing the exchange rate between the USD / GBP over the course of a given day. I have an application that wants to be able to graph this data or maybe a subset. For obvious reasons I do not want to plot 0.5 million points on my graph. What I need is a smaller data set (100 points or so) which accurately (as possible) represents the given data. Does anyone know of any interesting and performant ways this data can be achieved? Cheers, Karl

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• Log response-time in restlet-based webservice

  - by amarillion

  What is the simplest way to log the response-time for a restlet-based webservice? I want to make sure that our webservice has a reasonable response time. So I want to be able to keep an eye on response times, and do something about the requests that take too long. The closest thing I could find is this recipe: http://www.naviquan.com/blog/restlet-cookbook-log, it explains how to change the log format. But there doesn't seem to be a parameter for response times, so probably a completely different approach is needed.

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• Problem with Writing files using FileWriter automatically with Quartz Scheduler

  - by Jeeva

  I have chosen nearly 200 files to write on a position automatically on a particular time. Created a separate job names in Quartz scheduler. The job will be triggered on a time. I can read the files only after all the files have been written. I could not read after one file is written. I have closed the FileWriter after one file written. What is the solution to access the file and read which have been written into the hard Disk

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• XMLOutputStream, repairing namespaces, and attributes without namespaces

  - by comment_bot

  A simple task: write an element with an unnamespaced attribute: String nsURI = "http://example.com/"; XMLOutputFactory outF = XMLOutputFactory.newFactory(); outF.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true); XMLStreamWriter out = outF.createXMLStreamWriter(System.out); out.writeStartElement(XMLConstants.DEFAULT_NS_PREFIX, "element", nsURI); out.writeAttribute(XMLConstants.DEFAULT_NS_PREFIX, XMLConstants.NULL_NS_URI, "attribute", "value"); out.writeEndElement(); out.close(); Woodstox's answer: <element xmlns="http://example.com/" attribute="value"></element> JDK 6 answer: <zdef-159241566:element xmlns="" xmlns:zdef-159241566="http://example.com/" attribute="value"></zdef-159241566:element> What?! Further, if we add a prefix to the element: out.writeStartElement(ns, "element", nsURI); JDK 6 no longer attempts to emit xmlns="": <ns:element xmlns:ns="http://example.com/" attribute="value"></ns:element> I'm fairly sure this is a bug in JDK 6. Am I right? And could anyone suggest a work around that will keep both libraries (and any others) happy? I don't want to require woodstox if I can help it.

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• Rotate a Swing JLabel

  - by Johannes Rössel

  I am currently trying to implement a Swing component, inheriting from JLabel which should simply represent a label that can be oriented vertically. Beginning with this: public class RotatedLabel extends JLabel { public enum Direction { HORIZONTAL, VERTICAL_UP, VERTICAL_DOWN } private Direction direction; I thought it's be a nice idea to just alter the results from getPreferredSize(): @Override public Dimension getPreferredSize() { // swap size for vertical alignments switch (getDirection()) { case VERTICAL_UP: case VERTICAL_DOWN: return new Dimension(super.getPreferredSize().height, super .getPreferredSize().width); default: return super.getPreferredSize(); } } and then simply transform the Graphics object before I offload painting to the original JLabel: @Override protected void paintComponent(Graphics g) { Graphics2D gr = (Graphics2D) g.create(); switch (getDirection()) { case VERTICAL_UP: gr.translate0, getPreferredSize().getHeight()); gr.transform(AffineTransform.getQuadrantRotateInstance(-1)); break; case VERTICAL_DOWN: // TODO break; default: } super.paintComponent(gr); } } It seems to work—somehow—in that the text is now displayed vertically. However, placement and size are off: Actually, the width of the background (orange in this case) is identical with the height of the surrounding JFrame which is ... not quite what I had in mind. Any ideas how to solve that in a proper way? Is delegating rendering to superclasses even encouraged?

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• jstl taglib not found, where have I gone wrong?

  - by James.Elsey

  I'm trying to add Google Maps onto my JSPs by using the googlemaps jstl taglib. I've added this into my maven pom <dependency> <groupId>com.lamatek</groupId> <artifactId>googlemaps</artifactId> <version>0.98c</version> <scope>provided<>/scope </dependency> This then included the googlemaps-0.98c library under my project libraries in NetBeans, I right clicked and selected Manually install artifact and located the googlemaps.jar file I had downloaded. I've then added this into my taglibs file <%@taglib prefix="googlemaps" uri="/WEB-INF/googlemaps" %> And have then included this where I actually want to show a map on my jsp <googlemaps:map id="map" width="250" height="300" version="2" type="STREET" zoom="12"> <googlemaps:key domain="localhost" key="xxxx"/> <googlemaps:point id="point1" address="74 Connors Lane" city="Elkton" state="MD" zipcode="21921" country="US"/> <googlemaps:marker id="marker1" point="point1"/> </googlemaps:map> But when I load up my application, I get the following error. org.apache.jasper.JasperException: /jsp/dashboard.jsp(1,1) /jsp/common/taglibs.jsp(6,56) PWC6117: File "/WEB-INF/googlemaps" not found root cause org.apache.jasper.JasperException: /jsp/common/taglibs.jsp(6,56) PWC6117: File "/WEB-INF/googlemaps" not found Have I missed something simple? I'm unable to spot what I've done wrong so far.. Thanks

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• org.apache.commons.httpclient.HttpClient stuck on request

  - by Roman

  Hi All I have that code : while(!lastPage && currentPage < maxPageSize){ StringBuilder request = new StringBuilder("http://catalog.bizrate.com/services/catalog/v1/us/" + " some more ..."); currentPage++; HttpClient client = new HttpClient(new MultiThreadedHttpConnectionManager()); client.getHttpConnectionManager().getParams().setConnectionTimeout(15000); GetMethod get = new GetMethod(request.toString()); HostConfiguration configuration = new HostConfiguration(); int iGetResultCode = client.executeMethod(configuration, get); if (iGetResultCode != HttpStatus.SC_OK) { System.err.println("Method failed: " + get.getStatusLine()); return; } XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(get.getResponseBodyAsStream()); while (reader.hasNext()) { int type = reader.next(); // some more xml parsing ... } reader.close(); get.releaseConnection(); } Somehow the code gets suck from time to time on line : executing request. I cant find the configuration for a request time out (not the connection timeout) , can someone help me maybe , or is there something that I am doing basely wrong ? The client I am using.

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• Android relative layout problem

  - by DixieFlatline

  Hello! I just can't display the button at the bottom of the screen. I have 2 textviews and 2 edittexts set as gone, and they become visible when user clicks checkbox. It's only then that my button gets positioned properly Otherwise it sits on top of the app at launch of my app.(see here: http://www.shrani.si/f/3V/10G/4nnH4DtV/layoutproblem.png) I also tried android:layout_alignParentBottom="true" but that doesnt help either. <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/scrollview" android:layout_width="fill_parent" android:layout_height="wrap_content"> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:id="@+id/txt1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Krajevna skupnost: " android:layout_alignParentTop="true" /> <Spinner android:id="@+id/spinner1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:prompt="@string/ks_prompt" android:layout_below="@id/txt1" /> <TextView android:id="@+id/txt2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Zadeva: " android:layout_below="@id/spinner1" /> <Spinner android:id="@+id/spinner2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:prompt="@string/pod_prompt" android:layout_below="@id/txt2" /> <TextView android:id="@+id/tv1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Zadeva: " android:layout_below="@id/spinner2" /> <EditText android:id="@+id/prvi" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/tv1" /> <TextView android:id="@+id/tv2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/prvi" android:text="Vsebina: " /> <EditText android:id="@+id/drugi" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/tv2" /> <CheckBox android:id="@+id/cek" android:text="Obvešcaj o odgovoru" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/drugi" /> <TextView android:id="@+id/tv3" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/cek" android:text="Email: " android:visibility="gone"/> <EditText android:id="@+id/tretji" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/tv3" android:visibility="gone" /> <TextView android:id="@+id/tv4" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/tretji" android:visibility="gone" android:text="Telefon: " /> <EditText android:id="@+id/cetrti" android:layout_width="fill_parent" android:layout_height="wrap_content" android:visibility="gone" android:layout_below="@id/tv4" /> <Button android:id="@+id/gumb" android:text="Klikni" android:typeface="serif" android:textStyle="bold" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:layout_below="@id/cetrti" /> </RelativeLayout> </ScrollView>

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• Json Jackson deserialization without inner classes

  - by Eto Demerzel

  Hi everyone, I have a question concerning Json deserialization using Jackson. I would like to deserialize a Json file using a class like this one: (taken from http://wiki.fasterxml.com/JacksonInFiveMinutes) public class User { public enum Gender { MALE, FEMALE }; public static class Name { private String _first, _last; public String getFirst() { return _first; } public String getLast() { return _last; } public void setFirst(String s) { _first = s; } public void setLast(String s) { _last = s; } } private Gender _gender; private Name _name; private boolean _isVerified; private byte[] _userImage; public Name getName() { return _name; } public boolean isVerified() { return _isVerified; } public Gender getGender() { return _gender; } public byte[] getUserImage() { return _userImage; } public void setName(Name n) { _name = n; } public void setVerified(boolean b) { _isVerified = b; } public void setGender(Gender g) { _gender = g; } public void setUserImage(byte[] b) { _userImage = b; } } A Json file can be deserialized using the so called "Full Data Binding" in this way: ObjectMapper mapper = new ObjectMapper(); User user = mapper.readValue(new File("user.json"), User.class); My problem is the usage of the inner class "Name". I would like to do the same thing without using inner classes. The "User" class would became like that: import Name; import Gender; public class User { private Gender _gender; private Name _name; private boolean _isVerified; private byte[] _userImage; public Name getName() { return _name; } public boolean isVerified() { return _isVerified; } public Gender getGender() { return _gender; } public byte[] getUserImage() { return _userImage; } public void setName(Name n) { _name = n; } public void setVerified(boolean b) { _isVerified = b; } public void setGender(Gender g) { _gender = g; } public void setUserImage(byte[] b) { _userImage = b; } } This means to find a way to specify to the mapper all the required classes in order to perform the deserialization. Is this possible? I looked at the documentation but I cannot find any solution. My need comes from the fact that I use the Javassist library to create such classes, and it does not support inner or anonymous classes. Thank you in advance

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• Packing values into a single int

  - by user303907

  Hello, Let's say I have a couple of variables like apple, orange, banana I have 8 apples, 1 orange, 4 bananas. Is it possible to somehow convert those values into a single integer and also revert back to their original values based on the computed integer value? I found an example online. int age, gender, height; short packed_info; . . . // packing packed_info = (((age << 1) | gender) << 7) | height; . . . // unpacking height = packed_info & 0x7f; gender = (packed_info >>> 7) & 1; age = (packed_info >>> 8); But it doesn't seem to work as it should when I entered random numbers.

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• Auto increment column i JDO, GAE

  - by Viktor

  Hi, I have a data class with some fields, one is a URL that I consider the PK, if I add a new item (do a new sync) and save it it should overwrite the item in the database if it's the same URL. But I also need a "normal" Long id that is incremented for every object in the database and for this one I always get null unless I tags it as a PK, how can a get this incrementation but not have the column as my PK? @Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY) private Long _id; @Persistent private String _title; @PrimaryKey @Persistent private String _url; /Viktor

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• j2me - compare 2 dates

  - by Tal

  I am developing a J2ME application (CLDC 1.1 and MIDP 2.0) and I was wondering, What is the best way to get the time span between 2 dates? thanks, Tal.

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• How to get the Jabber ID for a Multi User Chat nick

  - by Kutzi

  I'm trying to get the Jabber ID for a nick in a multi user chat, but the following code returns only null: class JabberMUCMessageListenerAdapter implements PacketListener { private final MultiUserChat muc; public JabberMUCMessageListenerAdapter(MultiUserChat muc) { this.muc = muc; } @Override public void processPacket(Packet p) { if (p instanceof Message) { final Message msg = (Message) p; String jid = muc.getOccupant(msg.getFrom()).getJid(); // returns null ... } } } Does anyone know, what I'm doing wrong?

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• Constructor with less arguments from a constructor

  - by mike_hornbeck

  I have Constructor Tree(int a, int b, int c) and second Constructor Tree(int a, int b, int c, String s). How to load second constructor from first just to save writing all the logics ? I thought about something like this but it gives me 'null' object. public Tree(int a, int b, int c){ Tree t1 = new Tree(a, b, c, "randomString"); }

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• gwt-RPC problem! what is the best practice on using gwt-RPC?

  - by guaz

  Dear all, I want draw a chart based on the date retrieve from the database by using RPC. But everytime I fail to get the result. My rpc function is working. I think is the sequence of the process. below is my class: public class TrafficPattern_1 extends GChart { TrafficPattern_1() { final DBServiceAsync dbService = GWT .create(DBService.class); dbService.SendData(null, null, new AsyncCallback<Container_TrafficPattern>() { @Override public void onFailure(Throwable caught) { } @Override public void onSuccess(Container_TrafficPattern result) { // TODO Auto-generated method stub pContainer.SetaDate(result.aDate.get(1)); } }); pContainer.aDate.get(0); setChartSize(350, 200); setChartTitle("<h2>Temperature vs Time<h2>"); setPadding("8px"); //setPixelSize(380, 200); getXAxis().setAxisLabel("<small><b><i>Time</i></b></small>"); getXAxis().setHasGridlines(true); getXAxis().setTickCount(6); // Except for "=(Date)", a standard GWT DateTimeFormat string getXAxis().setTickLabelFormat("=(Date)h:mm a"); getYAxis().setAxisLabel("<small><b><i>&deg;C</i></b></small>"); getYAxis().setHasGridlines(true); getYAxis().setTickCount(11); getYAxis().setAxisMin(11); getYAxis().setAxisMax(16); addCurve(); getCurve().setLegendLabel("<i> </i>"); getCurve().getSymbol().setBorderColor("blue"); getCurve().getSymbol().setBackgroundColor("blue"); // getCurve().getSymbol().setFillSpacing(10); // getCurve().getSymbol().setFillThickness(3); getCurve().getSymbol().setSymbolType(SymbolType.LINE); getCurve().getSymbol().setFillThickness(2); getCurve().getSymbol().setFillSpacing(1); for (int i = 0; i < dateSequence.length; i++) // Note that getTime() returns milliseconds since // 1/1/70--required whenever "date cast" tick label // formats (those beginning with "=(Date)") are used. getCurve().addPoint(dateSequence[i].date.getTime(), dateSequence[i].value); }

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• Populating a ListView from a SQLite database in Android

  - by LordSnoutimus

  Hi, I am trying to populate a ListView in a separate class with data taken from a SQLite database held in another class. What would be the easiest way to do so? Thanks

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• any good jsch examples?

  - by jshen

  I'm trying to run a command over ssh with jsch, but jsch has virtually no documentation and the examples I've found via google are terrible. For example, this one doesn't show code for handling the output stream. And, this one using an ugly hack to know when to stop reading from the output stream.

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• JAX-WS client with Axis service

  - by Jon

  I'm relatively new to web services, but I need to integrate a call to an existing service in my application. Ideally, I'd like to use JAX-WS because I'm looking for the simplest, quickest-to-develop solution on my end, and MyEclipse is able to generate a JAX-WS client from a WSDL. Unfortunately, the WSDL I've inherited was built from what appears to be Axis using RPC. Will this still work? When trying to generate the code, I get these errors, and the web searches I've found seem to say that it's the service end that needs to upgrade: <restriction base="soapenc:Array"> <attribute ref="soapenc:arrayType" wsdl:arrayType="impl:MyTypeList[]" /> </restriction> WS-I: (BP2108) An Array declaration uses - restricts or extends - the soapEnc:Array type, or the wsdl:arrayType attribute is used in the type declaration WS-I: (BP2122) A wsdl:types element contained a data type definition that is not an XML schema definition <wsdlsoap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://ws.host.com" use="encoded" / WS-I: (BP2406) The use attribute of a soapbind:body, soapbind:fault, soapbind:header and soapbind:headerfault does not have value of "literal".

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• Multiple dex files define Lcom/google/api/client/auth/oauth/AbstractOAuthGetToken;

  - by Elad Benda

  I have just followed this tutorial: https://developers.google.com/drive/quickstart-android so I don't see a reason for duplicated libs in my project. I have added the drive Client lib via Google plugin for eclipse When I build my android app with this manifest <uses-sdk android:minSdkVersion="15" android:targetSdkVersion="16" /> <uses-permission android:name="android.permission.READ_CALENDAR" /> <uses-permission android:name="android.permission.WRITE_CALENDAR" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.GET_ACCOUNTS"/> <uses-permission android:name="android.permission.INTERNET" /> <application android:icon="@drawable/todo" android:label="@string/app_name" > <activity android:name=".TodosOverviewActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".TodoDetailActivity" android:windowSoftInputMode="stateVisible|adjustResize" > <intent-filter> <action android:name="android.intent.action.SEND" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="image/*" /> </intent-filter> </activity> <provider android:name=".contentprovider.MyTodoContentProvider" android:authorities="de.vogella.android.todos.contentprovider" > </provider> </application> I get the following error: [2013-10-27 00:43:58 - Dex Loader] Unable to execute dex: Multiple dex files define Lcom/google/api/client/auth/oauth/AbstractOAuthGetToken; [2013-10-27 00:43:58 - de.vogella.android.todos] Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define Lcom/google/api/client/auth/oauth/AbstractOAuthGetToken; how can I fix this?

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• spring roo vs appfuse generate service /dao layer

  - by cometta

  I am looking for feedback from experienced users on spring roo and appfuse. Which do you think does a better job reverse engineering database tables and generating a service layer, dao layer, and jpa entities? If I am not mistaken, spring roo currently cannot reverse engineer a database.

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• Noftification between J2EE components.

  - by Pratik

  Hi There! I have a design problem . My application has multiple J2EE components ,In simple terms one acts as a service provider(Non UI) and others are consumers(UI webapp) . The consumer gets the configuration data from the service provider(this basically reads the data from DB) during the start up and stores it in the Cache. The cache gets refreshed after periodic time to reflect any changes done at the database. The Problem Apart from the cache refresh ,I also want to notify the consumers when someone changes the DB . that configuration has been changed please reload it. What notification mechanism's can I use to achieve this. Thanks! Pratik

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• Putting JComboBox into JTable

  - by Dan

  Hi, I want to put individual JComboBoxes into each cells of a JTable. ie. The JComboBox content is not identical for each cell. I basically would like to be able to just call the following code to add a row of JComboBox into the JTable. Anyone has any idea? Thanks JComboBox cb1 = new JComboBox(...); JComboBox cb2 = new JComboBox(...); model.addRow(new Object[] {"Row name", cb1, cb2} ); JComboBox cb3 = new JComboBox(...); JComboBox cb4 = new JComboBox(...); model.addRow(new Object[] {"Row name 2", cb3, cb4} ); This is the resultant view if I do the above. http://www.freeimagehosting.net/uploads/a6292e08ee.png The closest example code I can find is as follows. But it is for where JComboBox content is identical for the individual column. Not the solution I need. TableColumn col = table.getColumnModel().getColumn(vColIndex); col.setCellEditor(new MyComboBoxEditor(values)); where public class MyComboBoxEditor extends DefaultCellEditor { public MyComboBoxEditor(String[] items) { super(new JComboBox(items)); } }

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• JPQL check many-to-many relationship

  - by Juriy

  Just a quick question: There's the entity (for example User) who is connected with the ManyToMany relationship to the same entity (for example this relation describes "friendship" and it is symmetric). What is the fastest way in terms of execution time to check if User A is a "friend" of user B? The "dumb" way would be to fetch whole List and then check if user exists there but that's obviously the overhead. I'm using JPA 2 Here's the sample code: @Entity @Table(name="users") public class UserEntity { @ManyToMany(fetch = FetchType.LAZY) private List<UserEntity> friends; .... }

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• Strange jboss console error

  - by c0mrade

  Hello everyone, I'm creating additional module to already multi-module maven project. And for this one I want everything to be like in other modules(meaning dependencies) just to test hello world, then I'll go do some more complex stuff. And it does print hello world as it should when deployed onto jboss server, but I get some strange error on console, had anyone had similar experience? and how can I fix it? Here it is : 15:48:35,789 ERROR [STDERR] log4j:ERROR A "org.jboss.logging.appender.FileAppender" object is not assignable to a "org.apache.log4j.Appender" variable. 15:48:35,789 ERROR [STDERR] log4j:ERROR The class "org.apache.log4j.Appender" was loaded by 15:48:35,790 ERROR [STDERR] log4j:ERROR [BaseClassLoader@9a8d9b{vfszip:/C:/jboss-5.1.0.GA/server/default/deploy/new-module-0.0.1-SNAPSHOT.war/}] whereas object of type 15:48:35,790 ERROR [STDERR] log4j:ERROR "org.jboss.logging.appender.FileAppender" was loaded by [org.jboss.bootstrap.NoAnnotationURLClassLoader@506411]. 15:48:35,790 ERROR [STDERR] log4j:ERROR Could not instantiate appender named "FILE".

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• How to use JTA support in Tomcat 6 for Hibernate ?

  - by EugeneP

  They recommend using JTA transaction support in JEE environment. But how to configure JTA in Tomcat6 so that Hibernate Session could use it ? Starting with version 3.0.1, Hibernate added the SessionFactory.getCurrentSession() method. Initially, this assumed usage of JTA transactions, where the JTA transaction defined both the scope and context of a current session. Given the maturity of the numerous stand-alone JTA TransactionManager implementations, most, if not all, applications should be using JTA transaction management, whether or not they are deployed into a J2EE container. Based on that, the JTA-based contextual sessions are all you need to use.

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