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• Get rid of redundant cast to javax.xml.bind.JAXBElement<java.lang.Boolean> warning from CXF-generate

  - by Binary255

  I generate some code using CXF from a WSDL-file. When compiling the code with version "1.6.0_16" with the flag -Xlint I get the following warning: warning: [cast] redundant cast to javax.xml.bind.JAXBElement<java.lang.Boolean> [javac] this.r = ((JAXBElement<Boolean> ) value); What does the warning mean, should I be worried? As I have generated and not written the code, what can I do to get rid of this specific warning?

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• I want to genrate following JSON dataobject using org.json.simple.JSONObject, how to do it in java?

  - by Abhishek

  Hi all, I want to genrate following JSON dataobject using org.json.simple.JSONObject, how to do it in java? { friends : [ { name: 'David', interests: 'Cooking', }, { name: 'Charles', interests: 'Hiking', }, { name: 'Mary', interests: 'Football', }, ] } If code snipet is provided then that will be really helpful! Regards, Abhi

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• What is the best way to use Ext JS as part of Java / Spring / Hibernate based web application?

  - by Igor Romanov

  We want to try Ext JS on new project. Is there any well-known best practice for integrating Ext JS with server side Java (Spring/Hibernate/JS) application? Is DWR a good choice for that?

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• How can JVM arguments be passed to apps started through java webstart in MacOS?

  - by siva

  We have a application which is triggered from browser. This application consumes around 800 mb of memory. This works perfectly when invoked from any browsers in windows OS. The same application when triggered from MacOS throws an out of memory exception which occurs when the application is short of memory. Is there any way to increase the memory allocated for apps running in mac os environment. Also please let me know how JVM arguments can be passed to apps started through java webstart in macOS.

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• How do I apply the for-each loop to every character in a String in Java?

  - by oxinabox.ucc.asn.au

  So I want to iterate for each character in a string. So I thought: for (char c : "xyz") but I get a compiler error: StackCharTester.java:20: foreach not applicable to expression type How can I do this?

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• Is this valid Java code? My teacher claims it is, but I'm really not so sure.

  - by Sergio Tapia

  Granted he didn't show us actual code here, just mentioned it, I found it extremely bizarre. For example, according to what he said this is valid Java: public class Person { String Name; int Age; { //These two braces just chilling together - VALID? :O } }

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• Do I need to javadoc every single method or just the 'main' method in java?

  - by Chris

  Java example method: //Stores the user input into an integer variable called 'choice' int choice = keyboard.nextInt(); Do I need to write javadoc for a simple method like this or should I only document the main method of any program, if so then what sort of things should I write for the main method? Thanks, Chris.

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• Where we can I get a good study guide for java?

  - by Venkats

  Please suggests to me some good website to collect java materials for more specific. Thanks in Advance.

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• How to execute a blocking function that returns a value for a maximum amount of time in Java.

  - by gamernb

  How would I go about making a function that would do this in java. String result = null do { SendData() // Run Blocking Function: ReceiveData() Until it returns a result // or t seconds have elapsed // if something returned, result = something // else result = null } while(result == null);

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• How can I apply antialiasing to instances of Shape3D in Java?

  - by Jonathan

  How can I apply antialiasing to instances of Shape3D in Java? I have tried something along these lines: // enable antialiasing Appearance planeApp = new Appearance(); LineAttributes la = new LineAttributes(); la.setLineAntialiasingEnable(true); planeApp.setLineAttributes(la); myShape.setAppearance(planeApp);

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• How to use Scanner to read silently from STDIN in Java?

  - by Nazgulled

  Hi, Is it possible to use the Java Scanner to read from STDIN silently? I mean, without outputting any pressed chars to the terminal?

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• Java, HashMaps and using Strings as the keys - does the string value get stored twice?

  - by MalcomTucker

  If I have a HashMap that looks like this: HashMap<String, MyObject> where the String key is a field in MyObject, does this string value get stored twice? So when I add entries: _myMap.put(myObj.getName(), myObj); Am I using double the String size in terms of memory? Or does Java do something clever behind the scenes? Thanks

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• Is there something like the OllyDbg / SoftICE disassembler + debugger for java?

  - by Ran Biron

  Is there a utility similar to OllyDbg / SoftICE for java? I.e. execute class (from jar / with class path) and, without source code, show the disassembly of the intermediate code with ability to step through / step over / search for references / edit specific intermediate code in memory / apply edit to file... If not, is it even possible to write something like this (assuming we're willing to live without hotspot for the debug duration)?

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• What's the nearest substitute for a function pointer in Java?

  - by Bill the Lizard

  I have a method that's about 10 lines of code. I want to create more methods that do the exact same thing except for a calculation that's going to change one line of code. This is a perfect application for passing in a function pointer to replace that one line, but Java doesn't have function pointers. What's my best alternative?

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• Which SHA-256 is correct? The Java SHA-256 digest or the Linux commandline tool

  - by Peter Tillemans

  When I calculate in Java an SHA-256 of a string with the following method I get : 5e884898da2847151d0e56f8dc6292773603dd6aabbdd62a11ef721d1542d8 on the commandline I do : echo "password" | sha256sum and get 5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8 if we compare these more closely I find 2 subtle differences 5e884898da2847151d0e56f8dc6292773603dd6aabbdd62a11ef721d1542d8 5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8 or : 5e884898da28 47151d0e56f8dc6292773603d d6aabbdd62a11ef721d1542d8 5e884898da28 0 47151d0e56f8dc6292773603d 0 d6aabbdd62a11ef721d1542d8 Which of the 2 is correct here?

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• How do I send email over SMTP with SSL using Java client?

  - by Ido

  I need to send email over smtp with ssl using java client. I'm not sure how to do that. If I have my server certificate installed on my Windows machine, how do I use it? If I want it to work on a non-Windows machine, do I need to get the certificates in a different way? BTW: If the SMTP server that I use is using SSL, can I be sure that it will send the mail to the recipient using SSL?

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• How can we stop a running java process through windows cmd?

  - by Wing C. Chen

  I am a newbie in cmd, so please allow me to ask a stupid question: How can we stop a running java process through windows cmd? For example, if we start jetty(a mini web server) with the following cmd: start javaw -jar start.jar How do we find the process and stop it later? Obviously the following cmd does not work: stop javaw -jar start.jar

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• How does java implement flyweight pattern for string under the hood?

  - by Dan

  If you have two instances of a String, and they are equal, in Java they will share the same memory. How is this implemented under the hood?

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• How to build a function on the fly in java?

  - by stereos

  I'm parsing a text file that is being mapped to some java code like such: public void eval(Node arg) { if(arg.data.equals("rand")) { moveRandomly(); } else if(arg.data.equals("home")) { goHome(); }//snip.. This is going to need to be re-evaluated about a thousand times and I'd rather not have to traverse the whole thing every time. Is there any way to make this traversal once and then have it be a function that is called every other time?

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• How to hide a running process from task manager using java?

  - by Navin

  I want to hide a process from task manager using java code, and tell me how to get the process id while giving the process name as input............

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• How can i benchmark method execution time in java?

  - by KP65

  I have a program which i have myself written in java, but I want to test method execution times and get timings for specific methods. I was wondering if this is possible, by maybe somehow an eclipse plug-in? or maybe inserting some code? Many thanks

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• How to get UTF-8 working in java webapps?

  - by kosoant

  I need to get UTF-8 working in my Java webapp (servlets + JSP, no framework used) to support äöå etc. for regular Finnish text and Cyrillic alphabets like ??? for special cases. My setup is the following: Development encironment: Windows XP Production encironment: Debian Database used: MySQL 5.x Users mainly use Firefox2 but also Opera 9.x, FF3, IE7 and Google Chrome are used to access the site. How to achieve this?

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• How can a 1Gb Java heap on a 64bit machine use 3Gb of VIRT space?

  - by Graeme Moss

  I run the same process on a 32bit machine as on a 64bit machine with the same memory VM settings (-Xms1024m -Xmx1024m) and similar VM version (1.6.0_05 vs 1.6.0_16). However the virtual space used by the 64bit machine (as shown in top under "VIRT") is almost three times as big as that in 32bit! I know 64bit VMs will use a little more memory for the larger references, but how can it be three times as big? Am I reading VIRT in top incorrectly? Full data shown below, showing top and then the result of jmap -heap, first for 64bit, then for 32bit. Note the VIRT for 64bit is 3319m for 32bit is 1220m. * 64bit * PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 22534 agent 20 0 3319m 163m 14m S 4.7 2.0 0:04.28 java $ jmap -heap 22534 Attaching to process ID 22534, please wait... Debugger attached successfully. Server compiler detected. JVM version is 10.0-b19 using thread-local object allocation. Parallel GC with 4 thread(s) Heap Configuration: MinHeapFreeRatio = 40 MaxHeapFreeRatio = 70 MaxHeapSize = 1073741824 (1024.0MB) NewSize = 2686976 (2.5625MB) MaxNewSize = -65536 (-0.0625MB) OldSize = 5439488 (5.1875MB) NewRatio = 2 SurvivorRatio = 8 PermSize = 21757952 (20.75MB) MaxPermSize = 88080384 (84.0MB) Heap Usage: PS Young Generation Eden Space: capacity = 268500992 (256.0625MB) used = 247066968 (235.62142181396484MB) free = 21434024 (20.441078186035156MB) 92.01715277089181% used From Space: capacity = 44695552 (42.625MB) used = 0 (0.0MB) free = 44695552 (42.625MB) 0.0% used To Space: capacity = 44695552 (42.625MB) used = 0 (0.0MB) free = 44695552 (42.625MB) 0.0% used PS Old Generation capacity = 715849728 (682.6875MB) used = 0 (0.0MB) free = 715849728 (682.6875MB) 0.0% used PS Perm Generation capacity = 21757952 (20.75MB) used = 16153928 (15.405586242675781MB) free = 5604024 (5.344413757324219MB) 74.24378912132907% used * 32bit * PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 30168 agent 20 0 1220m 175m 12m S 0.0 2.2 0:13.43 java $ jmap -heap 30168 Attaching to process ID 30168, please wait... Debugger attached successfully. Server compiler detected. JVM version is 14.2-b01 using thread-local object allocation. Parallel GC with 8 thread(s) Heap Configuration: MinHeapFreeRatio = 40 MaxHeapFreeRatio = 70 MaxHeapSize = 1073741824 (1024.0MB) NewSize = 1048576 (1.0MB) MaxNewSize = 4294901760 (4095.9375MB) OldSize = 4194304 (4.0MB) NewRatio = 8 SurvivorRatio = 8 PermSize = 16777216 (16.0MB) MaxPermSize = 67108864 (64.0MB) Heap Usage: PS Young Generation Eden Space: capacity = 89522176 (85.375MB) used = 80626352 (76.89128112792969MB) free = 8895824 (8.483718872070312MB) 90.0629940005033% used From Space: capacity = 14876672 (14.1875MB) used = 14876216 (14.187065124511719MB) free = 456 (4.3487548828125E-4MB) 99.99693479832048% used To Space: capacity = 14876672 (14.1875MB) used = 0 (0.0MB) free = 14876672 (14.1875MB) 0.0% used PS Old Generation capacity = 954466304 (910.25MB) used = 10598496 (10.107513427734375MB) free = 943867808 (900.1424865722656MB) 1.1104107034039412% used PS Perm Generation capacity = 16777216 (16.0MB) used = 11366448 (10.839889526367188MB) free = 5410768 (5.1601104736328125MB) 67.74930953979492% used

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• How do I use xStream to output Java Objects with List properties?

  - by Zachary Spencer

  Hello, I am trying to output some Java objects as JSON, they have List properties which I want to be formatted as { "People" : [ { "Name" : "Bob" } , { "Name" : "Jim" } ] } However, I cannot figure out how to do this with XStream. It always outputs as { "Person" : { "Name" : "Bob" }, "Person" : { "Name" : "Bob" } Is there a way to fix this? I've put together some sample code with a unit test in github if you need something more concrete to play with: http://gist.github.com/371358 Thanks!

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• Are there any embeddable document database engines for Java? Something similar to MongoDB or CouchDB

  - by Juha Syrjälä

  Are there any embeddable document database engines for Java, that do not require separate server. I am looking for something similar to MongoDB or CouchDB.

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