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  • How to create a custom Annotation and processing it using APT ?

    - by Dhana
    Hi, I'm new to Java Annotation. I know how to create custom annotation but I don't know how to process that Annotation to generate the dynamic code just like ejb 3.0 and hibernate does. I read some articles based on APT but no one gives the details about how to process the Annotation. Are there any tutorials with sample code for processing custom Annotations? Thanks

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  • User Session Management with Spring

    - by Chris
    I am developing a flex java - spring web app and have set up the business logic using hibernate. I want to maintain sessions so that when the user logs in , i can track the logged in user to display information that is related to the username. I want to do this using spring if possible and wondered if anyone could redirect me to a tutorial or even explain the method to which this is achieved , or if it is hard to achieve. Thanks Chris

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  • Ant hangs randomly with executing

    - by deltamatrix
    Hi, I have noticed in recent times that when invoking my ant scripts to build and unit test my Java app, it randomly hangs at various points in the execution. The ant scripts are been invoked from my local machine on my remote clearcase view. Has anyone else had this problem? Please advise if you can.

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  • JVM Bug with JDWP

    - by Dan
    I found this bug report from Sun indicating a problem with certain Java versions and enabling a JDWP port. But that bug report doesn't indicate when or even if it was fixed. Does anyone have more up-to-date info on that? thanks

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  • Is possible to make sexy GUI with javaFX & swing ?

    - by phmr
    I would like to do a "sexy" / user-friendly / appealing GUI in java. Swing is a limited in terms of "skin" customisation. I'm thinking about JavaFX but I don't it yet, what can I achieve with this technology ? how hard is it ? do you have examples of real-life examples of Swing/JavaFX integration ? I would like to do something in this spirit of this, which is built on the .NET framework: original link: http://www.patrickpayet.com/net/?p=329

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  • Getting an error on a webservice call from C#

    - by ooo
    i am calling a java webservice from C#. i generate the wdsl proxy through visual studio which works fine and i see the methods. etc. I have one issue where i get this error in one of the requests: org.xml.sax.SAXException: No object was found for class type class com.ml.ets.ease.analytics.soap.Request does anyone have any idea why i might be getting this error.

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  • Problems running local copy of etherpad

    - by alpgs
    I get the following message when trying to execute etherpad/bin/run-local.sh: Exception in thread "main" java.lang.NoClassDefFoundError: net/appjet/oui/main I created CLASSPATH variable, export CLASSPATH="/home/user/src/etherpad/trunk/infrastructure/build" but that didn't help either. Although I can clearly see net/appjet/oui package in the build directory.

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  • Handle Proxy servers?

    - by govardhan
    We are doing one project. We have to develope website, that displays all proxy servers list and when user click on particular server it will be activated to him. For this I am confusing on use Java or PHP. which is simple to handle proxys. Please help me.

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  • Best practices regarding equals: to overload or not to overload?

    - by polygenelubricants
    Consider the following snippet: import java.util.*; public class EqualsOverload { public static void main(String[] args) { class Thing { final int x; Thing(int x) { this.x = x; } public int hashCode() { return x; } public boolean equals(Thing other) { return this.x == other.x; } } List<Thing> myThings = Arrays.asList(new Thing(42)); System.out.println(myThings.contains(new Thing(42))); // prints "false" } } Note that contains returns false!!! We seems to have lost our things!! The bug, of course, is the fact that we've accidentally overloaded, instead of overridden, Object.equals(Object). If we had written class Thing as follows instead, then contains returns true as expected. class Thing { final int x; Thing(int x) { this.x = x; } public int hashCode() { return x; } @Override public boolean equals(Object o) { return (o instanceof Thing) && (this.x == ((Thing) o).x); } } Effective Java 2nd Edition, Item 36: Consistently use the Override annotation, uses essentially the same argument to recommend that @Override should be used consistently. This advice is good, of course, for if we had tried to declare @Override equals(Thing other) in the first snippet, our friendly little compiler would immediately point out our silly little mistake, since it's an overload, not an override. What the book doesn't specifically cover, however, is whether overloading equals is a good idea to begin with. Essentially, there are 3 situations: Overload only, no override -- ALMOST CERTAINLY WRONG! This is essentially the first snippet above Override only (no overload) -- one way to fix This is essentially the second snippet above Overload and override combo -- another way to fix The 3rd situation is illustrated by the following snippet: class Thing { final int x; Thing(int x) { this.x = x; } public int hashCode() { return x; } public boolean equals(Thing other) { return this.x == other.x; } @Override public boolean equals(Object o) { return (o instanceof Thing) && (this.equals((Thing) o)); } } Here, even though we now have 2 equals method, there is still one equality logic, and it's located in the overload. The @Override simply delegates to the overload. So the questions are: What are the pros and cons of "override only" vs "overload & override combo"? Is there a justification for overloading equals, or is this almost certainly a bad practice?

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  • Adding google.maps.latlng within a loop

    - by Mick Morrison
    I am new to Java Script. I am using it, in combination with Java Server Faces. I want to add some points to define a Polilyne using GoogleMaps Apiv3. My problem is that I can't add a FOR statement to the javascript, because it dumps. If I comment this FOR loop, it also dumps. The dump I am getting is: "javax.servlet.ServletException: null source". Has anyone any suggestion to solve this? Thanks in advance, Emanuel <script type="text/javascript"> function initialize() { var longit = "${dateRange.longitude}" ; var lat = "${dateRange.latitude}" ; var latlng = new google.maps.LatLng(lat, longit); var myOptions = { zoom: 15, center: latlng, mapTypeId: google.maps.MapTypeId.ROADMAP }; var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions); var points = []; var cadena1 = "${dateRange.latArray}" ; var cadena2 = "${dateRange.longArray}" ; var latArray = cadena1.split('?'); var longArray = cadena2.split('?'); /* The code Below is the one that fails */ for (var i=0; i < latArray.length; i++) { points.push(new google.maps.LatLng(latArray[i], longArray[i])); } /* Finish of the error code */ // The Polilyne is created var mapPath = new google.maps.Polyline ({ path: points, strokeColor: "#FF0000", strokeOpacity: 1.0, strokeWeight: 4 }); mapPath.setMap(map); } </script> </head> <body onload="initialize()"> <h:graphicImage url="http://localhost:8080/gps_tracking/faces/resources/images/logo.jpg"> </h:graphicImage> <h1 align="center">Sol-Tech</h1><br /> <hr></hr> <div id="map_canvas" style="width:100%; height:100%"></div> </body>

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  • Recursion inside while loop, How does it work ?

    - by M.H
    Can you please tell me how does this java code work? : public class Main { public static void main (String[] args) { Strangemethod(5); } public static void Strangemethod(int len) { while(len > 1){ System.out.println(len-1); Strangemethod(len - 1); } } } I tried to debug it and follow the code step by step but I didn't understand it.

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  • get Phone numbers from android phone

    - by Luca
    Hi! First of all i'm sorry for my english... I've a problem getting phone numbers from contacts. That's my code import android.app.ListActivity; import android.database.Cursor; import android.os.Bundle; import android.provider.ContactsContract; import android.widget.SimpleAdapter; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; public class TestContacts extends ListActivity { private ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String,String>>(); private SimpleAdapter numbers; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.contacts); numbers = new SimpleAdapter( this, list, R.layout.main_item_two_line_row, new String[] { "line1","line2" }, new int[] { R.id.text1, R.id.text2 } ); setListAdapter( numbers ); Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null); while (cursor.moveToNext()) { String contactId = cursor.getString(cursor.getColumnIndex( ContactsContract.Contacts._ID)); String hasPhone = cursor.getString(cursor.getColumnIndex( ContactsContract.Contacts.HAS_PHONE_NUMBER)); //check if the contact has a phone number if (Boolean.parseBoolean(hasPhone)) { Cursor phones = getContentResolver().query( ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ contactId, null, null); while (phones.moveToNext()) { // Get the phone number!? String contactName = phones.getString( phones.getColumnIndex( ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)); String phoneNumber = phones.getString( phones.getColumnIndex( ContactsContract.CommonDataKinds.Phone.NUMBER)); Toast.makeText(this, phoneNumber, Toast.LENGTH_LONG).show(); drawContact(contactName, phoneNumber); } phones.close(); } }cursor.close(); } private void drawContact(String name, String number){ HashMap<String,String> item = new HashMap<String,String>(); item.put( "line1",name); item.put( "line2",number); list.add( item ); numbers.notifyDataSetChanged(); } } It'seems that no contact have a phone number (i've added 2 contacts on the emulator and i've tried also on my HTC Desire). The problem is that if (Boolean.parseBoolean(hasPhone)) returns always false.. How can i get correctly phone numbers? I've tried to call drawContact(String name, String number) before the if statement without querying for the phone number, and it worked (it draws two times the name). but on the LinearLayout they are not ordered alphabetically... how can i order alphabetically (similar to the original contacts app)? thank you in advice, Luca

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  • Problem with \' in URLencoding

    - by Bruce
    I am working on Java. Here is my code response = URLEncoder.encode(response, "UTF-8").replaceAll("\\+", "%20"); Problem comes when there is a ' (single quote) in the string response. It gets encoded to \'. eg - 'Collective Dynamics of Complex Networks' comes as \'Collective Dynamics of Complex Networks\' I want it to remain as it is. What should I do?

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  • How to check if a given Regex is valid?

    - by Philipp Andre
    Hi folks, I have a little program allowing users to type-in some regular expressions. afterwards i like to check if this input is a valid regex or not. I'm wondering if there is a build-in method in Java, but could not find such jet. Can you give me some advice? Best regards Phil

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  • can not find symbol

    - by joseph
    // Register JDBC driver Class.forName("net.sourceforge.jtds.jdbc.Driver"); method forName(java.Lang.String) Class.forName("net.sourceforge.jtds.jdbc.Driver); ^

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  • Recommend me a good JNI book

    - by Jose Figueroa
    Hello, I'm creating a software project in Java, is a remote administration tool. The thing is that I need to add some features with C++ and I read some about this process and I realized I need JNI, could you recommend me a good JNI Book or something related with ?

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