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• Dlink DWA-556 Access point fails to start on 2.6.35-25 while 2.6.35-24 works. How can I do this with >2.6.35-24?

  - by Azendale

  I'm using hostapd to run an access point with a Dlink DWA-556 wireless N card. However, I can no longer get it to start when I use kernels greater than 2.6.35-24. Here's a log where I ran the uname -a&&hostapd -c <configfile> on the different kernel versions. Linux erikbandersen 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 02:41:37 UTC 2010 x86_64 GNU/Linux Configuration file: hostapd.conf ctrl_interface_group=0 Opening raw packet socket for ifindex 248 BSS count 1, BSSID mask ff:ff:ff:ff:ff:ff (0 bits) SIOCGIWRANGE: WE(compiled)=22 WE(source)=21 enc_capa=0xf nl80211: Added 802.11b mode based on 802.11g information HT40: control channel: 2 secondary channel: 6 RATE[0] rate=10 flags=0x2 RATE[1] rate=20 flags=0x6 RATE[2] rate=55 flags=0x6 RATE[3] rate=110 flags=0x6 RATE[4] rate=60 flags=0x0 RATE[5] rate=90 flags=0x0 RATE[6] rate=120 flags=0x0 RATE[7] rate=180 flags=0x0 RATE[8] rate=240 flags=0x0 RATE[9] rate=360 flags=0x0 RATE[10] rate=480 flags=0x0 RATE[11] rate=540 flags=0x0 Passive scanning not supported Mode: IEEE 802.11g Channel: 2 Frequency: 2417 MHz Flushing old station entries Deauthenticate all stations Using interface wlan1 with hwaddr 1c:bd:b9:d5:e8:3c and ssid 'erikbandersen.com/freewifi' wlan1: Setup of interface done. MGMT (TX callback) ACK Malformed netlink message: len=436 left=256 plen=420 256 extra bytes in the end of netlink message MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb mgmt::auth authentication: STA=3c:4a:92:0e:41:2f auth_alg=0 auth_transaction=1 status_code=0 wep=0 New STA wlan1: STA 3c:4a:92:0e:41:2f IEEE 802.11: authentication OK (open system) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-AUTHENTICATE.indication(3c:4a:92:0e:41:2f, OPEN_SYSTEM) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-DELETEKEYS.request(3c:4a:92:0e:41:2f) authentication reply: STA=3c:4a:92:0e:41:2f auth_alg=0 auth_transaction=2 resp=0 (IE len=0) MGMT (TX callback) ACK mgmt::auth cb wlan1: STA 3c:4a:92:0e:41:2f IEEE 802.11: authenticated mgmt::assoc_req association request: STA=3c:4a:92:0e:41:2f capab_info=0x421 listen_interval=10 Validating WMM IE: OUI 00:50:f2 OUI type 2 OUI sub-type 0 version 1 QoS info 0x0 HT: STA 3c:4a:92:0e:41:2f HT Capabilities Info: 0x102c handle_assoc STA 3c:4a:92:0e:41:2f - no greenfield, num of non-gf stations 1 handle_assoc STA 3c:4a:92:0e:41:2f - 20 MHz HT, num of 20MHz HT STAs 1 hostapd_ht_operation_update current operation mode=0x0 hostapd_ht_operation_update new operation mode=0x7 changes=2 new AID 1 wlan1: STA 3c:4a:92:0e:41:2f IEEE 802.11: association OK (aid 1) MGMT (TX callback) ACK mgmt::assoc_resp cb wlan1: STA 3c:4a:92:0e:41:2f IEEE 802.11: associated (aid 1) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-ASSOCIATE.indication(3c:4a:92:0e:41:2f) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-DELETEKEYS.request(3c:4a:92:0e:41:2f) wlan1: STA 3c:4a:92:0e:41:2f RADIUS: starting accounting session 4DAC8224-00000000 MGMT (TX callback) ACK mgmt::action cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb Signal 2 received - terminating wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-DEAUTHENTICATE.indication(3c:4a:92:0e:41:2f, 1) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-DELETEKEYS.request(3c:4a:92:0e:41:2f) Removing station 3c:4a:92:0e:41:2f hostapd_ht_operation_update current operation mode=0x7 hostapd_ht_operation_update new operation mode=0x0 changes=2 Flushing old station entries Deauthenticate all stations . Linux erikbandersen 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 x86_64 GNU/Linux Configuration file: hostapd.conf ctrl_interface_group=0 Opening raw packet socket for ifindex 248 BSS count 1, BSSID mask ff:ff:ff:ff:ff:ff (0 bits) SIOCGIWRANGE: WE(compiled)=22 WE(source)=21 enc_capa=0xf nl80211: Added 802.11b mode based on 802.11g information Allowed channel: mode=1 chan=1 freq=2412 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=2 freq=2417 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=3 freq=2422 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=4 freq=2427 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=5 freq=2432 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=6 freq=2437 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=7 freq=2442 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=8 freq=2447 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=9 freq=2452 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=10 freq=2457 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=11 freq=2462 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=1 freq=2412 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=2 freq=2417 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=3 freq=2422 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=4 freq=2427 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=5 freq=2432 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=6 freq=2437 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=7 freq=2442 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=8 freq=2447 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=9 freq=2452 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=10 freq=2457 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=11 freq=2462 MHz max_tx_power=27 dBm HT40: control channel: 2 secondary channel: 6 RATE[0] rate=10 flags=0x2 RATE[1] rate=20 flags=0x6 RATE[2] rate=55 flags=0x6 RATE[3] rate=110 flags=0x6 RATE[4] rate=60 flags=0x0 RATE[5] rate=90 flags=0x0 RATE[6] rate=120 flags=0x0 RATE[7] rate=180 flags=0x0 RATE[8] rate=240 flags=0x0 RATE[9] rate=360 flags=0x0 RATE[10] rate=480 flags=0x0 RATE[11] rate=540 flags=0x0 Passive scanning not supported Mode: IEEE 802.11g Channel: 2 Frequency: 2417 MHz Could not set channel for kernel driver wlan1: Unable to setup interface. My wireless card is listed as 02:00.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter (rev 01) by lspci. Am I doing it wrong and there's a new way of doing it? I'm holding off upgrading to Natty because of this. What changed between the versions that would cause this? Should I report it as a bug?

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• Webinar, June 27: Application Intelligence and Connected Devices

  - by terrencebarr

  Oracle and Beecham have recently conducted a market survey on use of Connected Devices for M2M & Internet of Things (IoT) applications and new trends. On June 27, 9 am ET the first session in this webinar series addresses intelligence in connected devices. Join Peter Utzschneider from Oracle and Robin Duke-Woolley of Beecham Research as they discuss the findings from this survey and the implications for the M2M & IoT connected devices market: What are the key business drivers of your connected devices program? To what extent do you expect the intelligence required for M2M & IoT applications to change? Would these changes occur at the network edge, at the data center, or both? What are the impacts of these changes on ISV’s and device manufacturers? What are the opportunities for other M2M & IoT players? To attend, please register for free or click on the image. Cheers, – Terrence Filed under: Embedded Tagged: Connected, devices, iot, Java Embedded, Java ME Embedded, M2M, webinar

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• New to Java and Spring. What are some good design principles for an inexperienced java developer like me?

  - by Imtiaz Ahmad

  I am learning Java and have written a few small useful programs. I am new to spring but have managed to understand the concept of dependency injection for decoupling. I'm trying to applying that in my development work in an enterprise setting. What are the 3 most important design patterns I should master (not for interview purposes but ones that I will use every day in as a good java developer)? Also what are some good java design considerations and practices in coding specifically in Java? My goal is write good decoupled and coherent programs that are easy to maintain that don't make me standout as a java rookie. Stuff like not beginning my package names with com. have already made me precariously visible in my team. But they know I have 2 years of coding experience and its not in java.

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• exact answer for “what is j2ee?” - job interview

  - by shuuchan

  I'd like to ask if someone of you knows the exact meaning of JEE. That's because a collegue of mine was asked this question in a job interview, and was "unable to answer properly"... to speak with his interwiewer's words. And when he told me what he said to his interviewer I got really surprised, since it was more or less what I would have answered myself - in a concise form, the first paragraph of this article. J2EE (Java 2 Platform, Enterprise Edition) is a Java platform designed for the mainframe-scale computing typical of large enterprises. Sun Microsystems (together with industry partners such as IBM) designed J2EE to simplify application development in a thin client tiered environment. J2EE simplifies application development and decreases the need for programming and programmer training by creating standardized, reusable modular components and by enabling the tier to handle many aspects of programming automatically. That seems not to be enough, since the interviewer asked for "more precise and less general definition". Is there really a more precise definition for JEE? Or did my colleague just find the fussiest-interviewer-ever? :)

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• June 2012 Critical Patch Update for Java SE Released

  - by Eric P. Maurice

  Hi, this is Eric Maurice. Oracle just released the June 2012 Critical Patch Update for Java SE.  This Critical Patch Update provides 14 new security fixes across Java SE products.  As discussed in previous blog entries, Critical Patch Updates for Java SE will, for the foreseeable future, continue to be released on a separate schedule than that of other Oracle products due to previous commitments made to Java customers.  12 of the 14 Java SE vulnerabilities fixed in this Critical Patch Update may be remotely exploitable without authentication.  6 of these vulnerabilities have a CVSS Base Score of 10.0.  In accordance with Oracle’s policies, these CVSS 10 scores represent instances where a user running a Java applet or Java Web Start application has administrator privileges (as is typical on Windows XP).  When the user does not run with administrator privileges (typical on the Solaris and Linux operating systems), the corresponding CVSS impact scores for Confidentiality, Integrity, and Availability for these vulnerabilities would be "Partial" instead of "Complete", thus lowering these CVSS Base Scores to 7.5. Due to the high severity of these vulnerabilities, Oracle recommends that customers obtain and apply these security fixes as soon as possible: Developers should download the latest release at http://www.oracle.com/technetwork/java/javase/downloads/index.html    Java users should download the latest release of JRE at http://java.com, and of course  Windows users can take advantage of the Java Automatic Update to get the latest release. In addition, Oracle recommends removing old an unused versions  of Java as the latest version is always the recommended version as it contains the most recent enhancements, and bug and security fixes.  For more information: •Instructions on removing older (and less secure) versions of Java can be found at http://java.com/en/download/faq/remove_olderversions.xml  •Users can verify that they’re running the most recent version of Java by visiting: http://java.com/en/download/installed.jsp   •The Advisory for the June 2012 Critical Patch Update for Java SE is located at http://www.oracle.com/technetwork/topics/security/javacpujun2012-1515912.html

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• Java EE@NYC Java Meetup

  - by reza_rahman

  On November 19th, I spoke at the New York City Java Meetup Group. It's a well-organized group led by my good friends Dario Laverde and Timothy Fagan - I have spoken there numerous times. I did my Java EE 7 talk (the same one from Java2Days 2012). JavaEE.Next(): Java EE 7, 8, and Beyond from reza_rahman The talk went very well -- the official RSVP shows 163 attended. I gave away a few GlassFish T-shirts, laptop stickers and Arun Gupta's Java EE 6 pocket guide. More details on the talk here. I most certainly look forward to speaking there again.

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• WebLogic Server(JRockit) - ???????????????????????????|WebLogic Channel|??????

  - by ???02

  ?????????????????????????????????????????????????JVM???????????????Oracle JRockit JVM????????????????????????????????????????JVM???????????????????????????????????????????????????????????????JRockit JVM?????????????????????????    1) ??????????????????    2) ???????????????????·???????    3) ???·??????????    4) ????·??????????????    5) ?????????????    6) ????·????????????????1) ??????????????????????????????????????????????Java????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·?????????????????????????????????????JVM?????????·???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????JVM?????????????    ¦Oracle JRockit Mission Control??JRockit????·?????????????????????????·????·??????????·???????????????·???????????????????????????????????????????????????????????????·????·?????????????????Oracle JRockit Mission Control?????·?????????????    ¦-Xverbose???????????????????????????-Xverbose:memdbg,gcpause,gcreport????????????????·????????????????????????????????-Xverbose:memdbg????????????????·????????????????????????????·???????????????????????Java????????????????????????????????????????????????????????JVM???????????????2) ???????????????????·???????????????????????????????JRockit JVM??????????1?????????????·??????·??????????????????????????????????    1) ????????????????????????·??????·???    ????JRockit JVM???????????·??????·???????????????????????????·??????????????????·????????????????    2)??????????·????·??????    ???????·??????·??????????????????????????·??????????????????????????·????·???????????????????????????????????????????????    3)???????·????·????·????·??????    ???????·??????·??????????????????????????·?????????????????????·????·????·????·???????????????????????????????????????????????????·????????????????Oracle JRockit???????·??????·?????4.2??????·?????????????????????????????2.1) ????????????????????????·??????·???JRockit JVM???????????·??????·???(??????????·????????????)??????????????·??????????????????????????????????????????????·????·????????????????????·??????????????????????·???????????????????????????????????????·??????·?????????????????·????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·??????·?????JRockit JVM???????????·????????????????????????·??????????????????????java -Xgc:throughput myApplication 2.2) ???????????·????·????·?????? ???????·????????????????????????????????????????·????·?????????????????????????????????????????????????????????·????·????(-Xgc:singlepar)????????????????????·???????????????????????????????????????????? 2.3) ??????????·????·?????? ??????????????????????????????????????????????????????????????????·????·????(-Xgc:genpar)??????????????????????????????????????????????????????????????????·????·???????????????????????????????·????????????????????????????????????????????3) ???·???????????????????·????64MB??????3GB(64???·???????)???1GB(32???·???????)??????????????????????·???????????????????????????????(?????1GB???????)????????????????????????-Xms(?????·???)?-Xmx(?????·???)????????·??????????????·??????????????????????-Xms?-Xmx?????????????????????????????????????????????:java -Xms:2g -Xmx:2g myApplication???????????·??????????????????????????????????Oracle JRockit???????·??????·?????4.4????????????????????????????????4) ????·??????????????????(????)??????????·????(-Xgc:throughput?-Xgc:genpar???-Xgc:gencon)????????????????????????????????????Java???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·???????????????????????????????????????????????????????????????????    -Xgc:throughput???-Xgc:genpar???????????·????????????????????????????????????????·??????????????    -Xgc:gencon???????????????????·?????????????????·????????????????????????????·????????????????????????????????????(??????????·??????)????????????(?????????·??????)????????????????????????????????????·???????????????????????????????????????????????????·???????????????????????????????????-Xns?????????????:java -Xgc:gencon -Xms:2g -Xmx:2g -Xns:512m myApplication5) ???????????????????????????????????????????????????????????????????????JRockit JVM????????????????????????????????????·???????????????(-Xgc)?????????????????????????????????????????????????·????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????2?????????????????????????????????????????????????????????·?????????????????????????????????????·?????????????????????????????????????????????????????????????????????????Oracle JRockit???????·??????·?????4.3??????????????????????6) ????·??????????????????TLA??????????Java???????????????????????????????????????????????????????????TLA???????????????????????Oracle JRockit JVM?????TLA?????????????????????????????????????????????TLA??????????????????????????????????????????????????????????????????????????????JRockit????·????????????????????????????????????????????????????????????????????????TLA???????????????????????????????????????????????????TLA??????????????Oracle JRockit???????·??????·?????4.4.1??????·??????????????????????????

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• ????????????????????????|WebLogic Channel|??????

  - by ???02

  ?Oracle WebLogic Server Enterprise Edition??????????????JRockit Mission Control??????OS??Web?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????JRockit Mission Control?????????????????????????????????????????Application Grid???????? ????????????????? ???(?????? Fusion Middleware?????? ?????????)??????????????????JRockit Mission Control?????????(???)??????????·???????????????JRockit Mission Control　????????????WebLogic Server Enterprise Edition??????????JRockit Flight Recorder?????????????????????????????OS??JVM?Java????????????WebLogic Server????????????????????　WebLogic Server Enterprise Edition???????JRockit Mission Control(JRMC)?????????JRMC?WebLogic Server??????????????????????????OutOfMemory????????????????????????????????????????????????????????GUI????????JRockit Flight Recorder???JRMC?1?????????????Flight Recorder???/???????????????/????JRMC??GUI??????????????????　?????????WebLogic Server????????JRockit Mission Control?JRockit Flight Recorder?????????????????????????????????????????????????JRockit Mission Control???????????????――??????WebLogic Server??????????????????????????????????????????????????JRockit Mission Control?????????????????????????????????????????????????????????????????????????????????????????????????????WebLogic Server?JRockit Mission Control??????????????????????????????: ?????????! ?????????????????JRockit Flight Recorder???????????????????????????　?????????????A??????????????????????????????????·?????????????????????????????Oracle WebLogic Server????????????????????????????????????????·???????Oracle Coherence?????????　?????????????????????????????????????????????????????????????????????????????????CPU?????????????·???????????????????CPU??????????????????????????????????????　??????????????????????WebLogic Server?Oracle Coherence???????????????JVM????·????????????????????????????????????????????　?????????????????????????JRockit Flight Recorder?????????????????????????????????????JRockit Mission Control??????????????　?????????Oracle Coherence??????????????????Java Sleep?????????????????　JRockit Mission Control???????Java Sleep????????????????????????????????????????????????????????JRockit Mission Control??????????????Java Sleep??????????????????????Oracle Coherence???????????　???????Coherence??????????????????Coherence????????????????????????????????????Java Sleep??????????????????????　?????????????????????????????????????????????Coherence???1?????????????????????Coherence??????????????????????????????????　????????????????????????Oracle Coherence??????????????????????????????????????????????????????????JRockit Flight Recorder?JRockit Mission Control??????????????????????????????????????????????????Java????????????????????????????????????????????????????????????????????????????　????JRockit Mission Control?????????????API????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????JRockit Flight Recorder?JRockit Mission Control???????????????????????????????????WebLogic Server????????????????????????????????????　?????????JRockit Flight Recorder?JRockit Mission Control???????????????2???????????????Pick-Up???????????JVM?JRockit????????·???????Oracle JRockit ???????·??????·?????????JVM????????????????????????????????????????????????????????????Pick-Up???????Oracle JRockit????·????????Java?????????????????????????????????- ????????????????????????????????????????- ???????????????????????????????????????????????JRockit????·?????????????????????????????????????

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• ?????????OutOfMemory?????????????????|WebLogic Channel|??????

  - by ???02

  WebLogic Server Enterprise Edition????????????JRockit Mission Control????????????????????????????????????????????????????????????????????????????????Application Grid???????? ????????????????? ???(?????? Fusion Middleware?????? ???????????)??????????????????JRockit Mission Control?????2?????(???)????????????OutOfMemory????????　Java????????????????????1????????????????????????OutOfMemory?????????????·??????JVM????????????????????????????????????????????????B?????OutOfMemory????????????　B????????????????·?????????????????????????WebLogic Server???????????????OutOfMemory???????????????????????????????????????????????????????????????????????????????????????????????????????　????B???????????????JRockit Mission Control?1??????Memory Leak Detector?????OutOfMemory???????????????Memory Leak Detector?Java????????????·???????????????????????????????????????????????????????????????????????????????????????????????????????　Memory Leak Detector?????????????????????????????????????(byte[])???????????????????????????????????·??????(GC)????????????????????????????????　????????????????????????????????????????????????Memory Leak Detector????·??????????·??????????????????????????????????????????????????????????????ThreadLocal??????????????????????????40%??????????????????java.lang.ThreadLocal?????????　WebLogic Server???Java EE????????·????????????????/??????????????????????????????????????·???????????????????????·????ThreadLocal?????????????·???????????????????????·?????????????????ThreadLocal???????????????????????????ThreadLocal??????????????????????????????　???????ThreadLocal?????????????????Memory Leak Detector?????????????????????·?????????????????????????????(ThreadLocal???????????????)???????·????????????????????????????????????????????????????????????1????????????1?????·????????????????????????????????????????????·????????????????　??B???????WebLogic Server???????????????????????????????WebLogic Server????2???????????????????????????????????????????????????????????????????1?????????????2?????·?????????????2?????????·???????????　???ThreadLocal???????????????ThreadLocal????????????????Thread??????????????????????????????????????Thread???????????????????GC?????????????????GC????????????????????????·?????????????????????????????????????????????·?????????????????????????????(????????·???·???·????)?　WebLogic Server???????????????????????????????????????????????(?????????????????)???"????"?????????????????????????????GC??????????ThreadLocal???????????????????????????????????????GC?????????????????????????????????????????????????????????????????????????????????OutOfMemory?????????????????　??????????????????JRockit Flight Recorder?JRockit Mission Control????????????????????????????????????ThreadLocal????????????????????????????·???·????????????????????????????JRockit Flight Recorder/JRockit Mission Control????????WebLogic Server?????????????????????????????????·????????????????　????????????????????????????·???????????C??????????WebLogic Server??????????????????????????????????????????????4??(1????×4??)??????12??(2????×6??)???????????　??????????3?????????????????????????????????????????????????4??·???????3,500??????????????12??????????2,000???????????????????　???C??????????JVM????·????GC?????????????????????????OS???????????·??????????????????????????????????????????????　???????????????????????JRockit Flight Recorder?????????????????????????????????????·?????????????????30??????????????????????　???????????????????1?????????????????????(??????·?????)?????????????????????WebLogic Server??????????????????????????????????????????·?????????????????????　???????????????????????????????????????????????????????Spin(???)??????????????????·???????????????????????????????????????????????????????????·???????????????JRockit Flight Recorder??????????????????12??????????????·??????????????????(4??/1 JVM)????Java???·????????????(12??/1 JVM)????Java???·????????　??????·?????????CPU????????????????????????????·???????????????????????????????CPU??????????????????????????????????????????????????????·?????????????????????????????·????　?????????·??????????????????·????????????????????????????????????????????????????????????·??????????????????????????????????·?????????????????????·?????????????????(?????????????·???????????????????)?　WebLogic Server?JVM???Oracle JRockit???CPU???????JVM?????????????JVM?????????????????????????????????????????????????(JVM????-XX:BindToCPUs???????????CPU?????????JVM???-XX:NumaMemoryPolicy=strictlocal???????????????·?????????)??????????·???????????????????????????????(12??/1 JVM)????Java???·????????(?????)*　　　*　　　*　??????????3?????????????????????????????????????????????????WebLogic Server????OS?????????????????????????????????JRockit Flight Recorder??????????????JRockit Mission Control???????????????????????????????????????????WebLogic Server?????????????????????????????????????JRockit Flight Recorder /JRockit Mission Control??????????????????????????????????????????????????????????????????????????????????????

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• Error: java.security.AccessControlException: Access denied

  - by RMD

  Hi, I have to connect to a https url with username and password to read a file. I am not able to connect to the server (see the error log below). I do not have much java experience so I need help with this code. I would really appreciate some help to solve this! Thank you. Raquel CODE: import lotus.domino.; import java.net.; import java.io.*; import javax.net.ssl.HttpsURLConnection; public class JavaAgent extends AgentBase { public void NotesMain() { try { String username = "123"; String password = "456"; String input = username + ":" + password; String encoding = new sun.misc.BASE64Encoder().encode (input.getBytes()); //Open the URL and read the text into a Buffer String urlName = "https://server.org/Export.mvc/GetMeetings?modifiedSince=4/9/2010"; URL url = new URL(urlName); HttpsURLConnection connection = (HttpsURLConnection)url.openConnection(); connection.setRequestMethod("POST"); connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); connection.setRequestProperty("Content-Length", String.valueOf (encoding.length())); connection.setUseCaches(false); connection.setDoInput(true); connection.setDoOutput(true); connection.setAllowUserInteraction(true); connection.setRequestProperty("Authorization", "Basic " + encoding); connection.setRequestProperty("Cookie", "LocationCode=Geneva"); connection.connect(); BufferedReader rd = null; try{ rd = new BufferedReader(new InputStreamReader(connection.getInputStream())); } catch (IOException e) { System.out.println("Read failed"); System.exit(-1); } String line; while((line = rd.readLine()) != null) { System.out.println(line.toString()); } rd.close(); connection.disconnect(); } catch(Exception e) { e.printStackTrace(); } } } LOG: java.security.AccessControlException: Access denied (java.lang.RuntimePermission exitVM.-1) at java.security.AccessController.checkPermission(AccessController.java:108) at java.lang.SecurityManager.checkPermission(SecurityManager.java:532) at COM.ibm.JEmpower.applet.AppletSecurity.superDotCheckPermission(AppletSecurity.java:1449) at COM.ibm.JEmpower.applet.AppletSecurity.checkRuntimePermission(AppletSecurity.java:1311) at COM.ibm.JEmpower.applet.AppletSecurity.checkPermission(AppletSecurity.java:1611) at COM.ibm.JEmpower.applet.AppletSecurity.checkPermission(AppletSecurity.java:1464) at java.lang.SecurityManager.checkExit(SecurityManager.java:744) at java.lang.Runtime.exit(Runtime.java:99) at java.lang.System.exit(System.java:275) at JavaAgent.NotesMain(Unknown Source) at lotus.domino.AgentBase.runNotes(Unknown Source) at lotus.domino.NotesThread.run(Unknown Source)

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• how can i disable the default console handler, while using the java logging api ?

  - by loudiyimo

  Hi I am trying to implement the java logging in my application. I want to use two handlers. A file handler and my own console handler. Both of my handlers work fine. My logging is send to a file and to the console . My logging is also sent to the default console handler, which i do not want. If you run my code you will see extra two line sent to the console. I don't want to use de default console handler. Does anyone know how to disable the default console handler. I only want to use the two hadlers i have created. Handler fh = new FileHandler("test.txt"); fh.setFormatter(formatter); logger.addHandler(fh); Handler ch = new ConsoleHandler(); ch.setFormatter(formatter); logger.addHandler(ch); import java.util.Date; import java.util.logging.ConsoleHandler; import java.util.logging.FileHandler; import java.util.logging.Formatter; import java.util.logging.Handler; import java.util.logging.Level; import java.util.logging.LogManager; import java.util.logging.LogRecord; import java.util.logging.Logger; public class LoggingExample { private static Logger logger = Logger.getLogger("test"); static { try { logger.setLevel(Level.INFO); Formatter formatter = new Formatter() { @Override public String format(LogRecord arg0) { StringBuilder b = new StringBuilder(); b.append(new Date()); b.append(" "); b.append(arg0.getSourceClassName()); b.append(" "); b.append(arg0.getSourceMethodName()); b.append(" "); b.append(arg0.getLevel()); b.append(" "); b.append(arg0.getMessage()); b.append(System.getProperty("line.separator")); return b.toString(); } }; Handler fh = new FileHandler("test.txt"); fh.setFormatter(formatter); logger.addHandler(fh); Handler ch = new ConsoleHandler(); ch.setFormatter(formatter); logger.addHandler(ch); LogManager lm = LogManager.getLogManager(); lm.addLogger(logger); } catch (Throwable e) { e.printStackTrace(); } } public static void main(String[] args) { logger.info("why does my test application use the standard console logger ?\n" + " I want only my console handler (Handler ch)\n " + "how can i turn the standard logger to the console off. ??"); } }

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• Connect to SQLite Database using Eclipse (Java)

  - by bnabilos

  Hello, I'm trying to connect to SQLite database with Ecplise but I have some errors. This is my Java code and the errors that I get on output. Please see if you can help me. Thank you in advance. package jdb; import java.sql.*; public class Test { public static void main(String[] args) throws Exception { Class.forName("org.sqlite.JDBC"); Connection conn = DriverManager.getConnection("jdbc:sqlite:/Applications/MAMP/db/sqlite/test.sqlite"); Statement stat = conn.createStatement(); stat.executeUpdate("drop table if exists people;"); stat.executeUpdate("create table people (name, occupation);"); PreparedStatement prep = conn.prepareStatement( "insert into people values (?, ?);"); prep.setString(1, "Gandhi"); prep.setString(2, "politics"); prep.addBatch(); prep.setString(1, "Turing"); prep.setString(2, "computers"); prep.addBatch(); prep.setString(1, "Wittgenstein"); prep.setString(2, "smartypants"); prep.addBatch(); conn.setAutoCommit(false); prep.executeBatch(); conn.setAutoCommit(true); ResultSet rs = stat.executeQuery("select * from people;"); while (rs.next()) { System.out.println("name = " + rs.getString("name")); System.out.println("job = " + rs.getString("occupation")); } rs.close(); conn.close(); } } ans that what I get in Ecplise : Exception in thread "main" java.lang.ClassNotFoundException: org.sqlite.JDBC at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:315) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330) at java.lang.ClassLoader.loadClass(ClassLoader.java:250) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at jdb.Test.main(Test.java:7) Thank you

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• Linux configurations that would affect Java memory usage?

  - by wmacura

  Hi, Background: I have a set of java background workers I start as part of my webapp. I develop locally on Ubuntu 10.10 and deploy to an Ubuntu 10.04LTS server (a media temple (ve) instance). They're both running the same JVM: Sun JVM 1.6.0_22-b04. As part of the initialization script each worker is started with explicit Xmx, Xms, and XX:MaxPermGen settings. Yet somehow locally all 10 workers use 250MB, while on the server they use more than 2.7GB. I don't know how to begin to track this down. I thought the Ubuntu (and thus, kernel) version might make a difference, but I tried an old 10.04 VM and it behaves as expected. I've noticed that the machine does not seem to ever use memory for buffer or cache (according to htop), which seems a bit strange, but perhaps normal for a server? (edited) Some info: (server) root@devel:/app/axir/target# uname -a Linux devel 2.6.18-028stab069.5 #1 SMP Tue May 18 17:26:16 MSD 2010 x86_64 GNU/Linux (local) wiktor@beastie:~$ uname -a Linux beastie 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 x86_64 GNU/Linux (edited) Comparing PS output: (ps -eo "ppid,pid,cmd,rss,sz,vsz") PPID PID CMD RSS SZ VSZ (local) 1588 1615 java -cp axir-distribution. 25484 234382 937528 1615 1631 java -cp /home/wiktor/Code/ 83472 163059 652236 1615 1657 java -cp /home/wiktor/Code/ 70624 89135 356540 1615 1658 java -cp /home/wiktor/Code/ 37652 77625 310500 1615 1669 java -cp /home/wiktor/Code/ 38096 77733 310932 1615 1675 java -cp /home/wiktor/Code/ 37420 61395 245580 1615 1684 java -cp /home/wiktor/Code/ 38000 77736 310944 1615 1703 java -cp /home/wiktor/Code/ 39180 78060 312240 1615 1712 java -cp /home/wiktor/Code/ 38488 93882 375528 1615 1719 java -cp /home/wiktor/Code/ 38312 77874 311496 1615 1726 java -cp /home/wiktor/Code/ 38656 77958 311832 1615 1727 java -cp /home/wiktor/Code/ 78016 89429 357716 (server) 22522 23560 java -cp axir-distribution. 24860 285196 1140784 23560 23585 java -cp /app/axir/target/a 100764 161629 646516 23560 23667 java -cp /app/axir/target/a 72408 92682 370728 23560 23670 java -cp /app/axir/target/a 39948 97671 390684 23560 23674 java -cp /app/axir/target/a 40140 81586 326344 23560 23739 java -cp /app/axir/target/a 39688 81542 326168 They look very similar. In fact, the question now is why, if I add up the virtual memory usage on the server (3.2GB) does it more closely reflect 2.4GB of memory used (according to free), yet locally the virtual memory used adds up to a much more substantial 4.7GB but only actually uses ~250MB. It seems that perhaps memory isn't being shared as aggressively. (if that's even possible) Thank you for your help, Wiktor

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• Setup database for Unit tests with Spring, Hibernate and Spring Transaction Support

  - by Michael Bulla

  I want to test integration of dao-layer with my service-layer in a unit-test. So I need to setup some data in my database (hsql). For this setup I need an own transaction at the begining of my testcase to ensure that all my setup is really commited to database before starting my testcase. So here's what I want to achieve: // NotTranactional public void doTest { // transaction begins setup database // commit transaction service.doStuff() // doStuff is annotated @Transactional(propagation=Propagation.REQUIRED) } Here is my not working code: @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"/asynchUnit.xml"}) @DirtiesContext(classMode=ClassMode.AFTER_EACH_TEST_METHOD) public class ReceiptServiceTest implements ApplicationContextAware { @Autowired(required=true) private UserHome userHome; private ApplicationContext context; @Before @Transactional(propagation=Propagation.REQUIRED) public void init() throws Exception { User user = InitialCreator.createUser(); userHome.persist(user); } @Test public void testDoSomething() { ... } } Leading to this exception: org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here at org.springframework.orm.hibernate3.SpringSessionContext.currentSession(SpringSessionContext.java:63) at org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:687) at de.diandan.asynch.modell.GenericHome.getSession(GenericHome.java:40) at de.diandan.asynch.modell.GenericHome.persist(GenericHome.java:53) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196) at $Proxy28.persist(Unknown Source) at de.diandan.asynch.service.ReceiptServiceTest.init(ReceiptServiceTest.java:63) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) I dont know whats the right way to get the transaction around setup database. What I tried: @Before @Transactional(propagation=Propagation.REQUIRED) public void setup() { setup database } - Spring seems not to start transaction in @Before-annotated methods. Beyond that, thats not what I really want, cause there are a lot merhods in my testclass which needs a slightly differnt setup, so I need several of that init-methods. @Transactional(propagation=Propagation.REQUIRED) public void setup() { setup database } public void doTest { init(); service.doStuff() // doStuff is annotated @Transactional(propagation=Propagation.REQUIRED) } -- init seems not to get started in transaction What I dont want to do: public void doTest { // doing my own transaction-handling setup database // doing my own transaction-handling service.doStuff() // doStuff is annotated @Transactional(propagation=Propagation.REQUIRED) } -- start mixing springs transaction-handling and my own seems to get pain in the ass. @Transactional(propagation=Propagation.REQUIRED) public void doTest { setup database service.doStuff() } -- I want to test as real as possible situation, so my service should start with a clean session and no transaction opened So whats the right way to setup database for my testcase?

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• java-COM interop: Implement COM interface in Java

  - by mdma

  How can I implement a vtable COM interface in java? In the old days, I'd use the Microsft JVM, which had built in java-COM interop. What's the equivalent for a modern JRE? Answers to a similar SO question proposed JACOB. I've looked at JACOB, but that is based on IDispatch, and is aimed at controlling Automation serers. The COM interfaces I need are custom vtable (extend IUnknown), e.g. IPersistStream, IOleWindow, IContextMenu etc. For my use case, I could implement all the COM specifics in JNI, and have the JNI layer call corresponding interfaces in java. But I'm hoping for a less painful solution. It's for an open source project, so open source alternatives are preferred.

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• java util iterator but cannot import java.util.iterator

  - by qwertzuiop13

  Given this Code import java.util.Iterator; private static List<String> someList = new ArrayList<String>(); public static void main(String[] args) { someList.add("monkey"); someList.add("donkey"); //Code works when I change Iterator to java.util.Iterator, but import //is not possible? for(Iterator<String> i = someList.iterator(); i.hasNext(); ) { String item = i.next(); System.out.println(item); } } I receive the error: The type Iterator is not generic; it cannot be parameterized with arguments Eclipse tells me that the import java.util.iterator conflicts with a type defined in the same file. lol... ?

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• Java tool to remove warnings from code developed in java 1.4

  - by Nitin Ware

  Hi All, I am working on a soucre code which was developed using java 1.4 but now we want to migrate it to java 6. I was able to compile it but there are tons of warnings related to use of java generics wherever we have made use of collections framework. It is possible to remove them by manually make changes to them, but I wanna know if is there any tool which can run on the source code and remove all the warnings by making necessary changes ot the code. Any help will be highly appreciated. Cheers, Nitin Ware

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• MyClass cannot be cast to java.lang.Comparable: java.lang.ClassCastException

  - by user2234225

  I am doing a java project and I got this problem and don't know how to fix it. The classes in my project (simplified): public class Item { private String itemID; private Integer price; public Integer getPrice() { return this.price; } } public class Store { private String storeID; private String address; } public class Stock { private Item item; private Store store; private Integer itemCount; public Integer getInventoryValue() { return this.item.getPrice() * this.itemCount; } } Then I try to sort an ArrayList of Stock so I create another class called CompareByValue public class CompareByValue implements Comparator<Stock> { @Override public int compare(Stock stock1, Stock stock2) { return (stock1.getInventoryValue() - stock2.getInventoryValue()); } } When I try to run the program, it gives the error: Exception in thread "main" java.lang.ClassCastException: Stock cannot be cast to java.lang.Comparable Anyone know what's wrong?

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• How to run java code using Java code?

  - by Nitz

  Hey Guys i want to do basically two things 1)I want to know is there any way that i can run the java code, using some java code. 2 ) and if it is possible then , and whatever the out put is then it should get that out put [ maybe output or error or exception ] and show on my screen, so i need to get that also. I know this is possible bcz one of my senior had done that..but i don't know how? May be with using the java's inbuilt classes. Note: user will write the code in some text file and then i will store that file content in some variable and then may be run that code.

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• Java and gstreamer-java initialisation error

  - by Mark

  I am building a small app which will play streaming audio from the internet in java (mainly internet radio stations). I have decided to use the gstreamer-java library for the sound, which uses JNA. I would like to include a check in the code, to see whether the gstreamer library has been initialised. When I have left the "Gst.init()" code out (to mimic when the library has not been initialised correctly), the application throws out the following messages: (process:21888): GLib-GObject-CRITICAL **: /build/buildd/glib2.0-2.22.3/gobject/gtype.c:2458: initialization assertion failed, use IA__g_type_init() prior to this function (process:21888): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed The app calls the gstreamer-java library. The error messages appear but the thread continues to run, hogging the CPU. Is there any way to catch the error or to add a check to prevent it from happening? An alternative would be to put the "Gst.init()" in the main class, but I am not sure if this would always guarantee the gstreamer library is initialised.

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• when to choose ruby on rails over java [closed]

  - by Dany Y

  I have been working with Java EE for 6 years, and I have mostly used it even for simple applications like data-entry to database). I heard Ruby on Rails is superior to Java in this domain. What are the actual advantages of Ruby. and should I switch ? P.S : I know this is a subjective question, and the most probable answer is "depends on what you'll use it for", but this is exactly what I want to know when to use what. Thank you

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• Oracle Sun Java Roadshow

  - by Lajos Sárecz

  Jövo héten, május 20-án Oracle Sun Java Roadshow konferencia lesz Ramada Plaza Budapest Hotel helszínnel. Hogy jön ide a blog-ba egy Java konferencia kedvcsinálója? A tervezett program ismeretében talán már nem olyan meglepo. Ugyanis az egyik eloadás a közelmúltban megjelent Oracle Berkeley újdonságairól fog szólni. Bár az Oracle már 2006 februárjában felvásárolta a Berkeley DB-t, azóta Magyarországon nem volt olyan Oracle rendezvény, ahol érdemben szó esett volna róla, így mindenkit bíztatok, hogy ne hagyja ki ezt a lehetoséget.

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• JavaOne 2012 - Java Generics

  - by Sharon Zakhour

  At JavaOne 2012, Venkat Subramaniam of Agile Developer, Inc, presented a conference session titled "The Good, The Bad, and the Ugly of Java Generics." Dr Subramaniam discussed the use of generics, what to watch out for when using generics, and best practices. To learn more about working with generics, see the Generics trail in the Java Tutorials. The trail was recently expanded and coverage added for the following topics: Generics, Inheritance, and Subtypes Guidelines for Wildcard Use Restrictions on Generics Wildcard Capture and Helper Methods Effects of Type Erasure and Bridge Methods

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• Installed Sun Java 6 - configuration problem when running as sudo

  - by HorusKol

  I have install Sun Java 6 on an Ubuntu server and set an environment variable in the default profile as per the instructions at http://www.edugate.ie/workshop-guides/shibboleth-2-identity-provider-installation-linux-debian-or-ubuntu I then try to run an installer for a Java servlet - but when I run it as myself, it cannot create the required directory in /opt. When I run it as sudo, I am told that JAVA_HOME is not correct and it doesn't even start the installer - shouldn't this be coming from /etc/profile like it is for my normal user?

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• Zombiewood for your Java ME tech-enabled Nokia C3

  - by hinkmond

  Zombies... Zoooombies... Here come the zombies in the new Zombiewood game for your Java ME technology-enabled Nokia C3. Watch the video to check it out. See: Zombiewood on Java ME Nokia C3 If you had two handguns and a couple sticks of dynamite, I'm sure you'd be looking to shoot zombies and collect giant floating gold coins spinning on the sidewalk. 'Cause that's what you do in that situation, right? Hinkmond

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