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• Reusing a PreparedStatement multiple times

  - by Steel Plume

  Hello, in the case of using PreparedStatement with a single common connection without any pool, can I recreate an instance for every dml/sql operation mantaining the power of prepared statements? I mean: for (int i=0; i<1000; i++) { PreparedStatement preparedStatement = connection.prepareStatement(sql); preparedStatement.setObject(1, someValue); preparedStatement.executeQuery(); preparedStatement.close(); } instead of: PreparedStatement preparedStatement = connection.prepareStatement(sql); for (int i=0; i<1000; i++) { preparedStatement.clearParameters(); preparedStatement.setObject(1, someValue); preparedStatement.executeQuery(); } preparedStatement.close(); my question arises by the fact that I want to put this code into a multithreaded environment, can you give me some advice? thanks

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• Getting a 404 when setting up MVC in IIS 6 and using .NET 4 beta 2

  - by joshcomley

  Hi all, I've completed this set up on a fair few IIS 6 boxes, but one is giving me a tough time. The problem occurs when I add the application extension mapping to: c:\windows\microsoft.net\framework\v4.0.21006\aspnet_isapi.dll When this is in place, I get a 404 error on every request. Even if I remove all files from the application directory apart from a basic test.htm and navigate to that, I still get a 404. I've unchecked the "Verify that file exists" I've set up a .NET 4 application pool and pointed my application to that I've changed the ASP.NET version to 4.0.21006 I've checked the IIS log file, and there's nothing useful in there (it only shows the first bunch of requests after each reboot and then stops logging) I've checked the application event log and nothing gets reported I've installed MVC 2 I've copied the set up onto another box, just to be sure, following all the same steps - and it all works! What else can I look out for?? N.B: If I set .NET to v2 in IIS, then I can successfully navigate to \test.htm

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• Upgrading to IIS7 stopped Firefox from receiving cookies?

  - by Ted Spence

  Our website has been using IIS6 for a long time. We test on IE8, Firefox, and Chrome. All browsers worked fine. We recently did an upgrade to IIS7, and Chrome and IE8 continue to work normally, but Firefox appears to be unable to get the ASP session cookie. As a result, when our code checks the Session[] object, we see nothing, we think the user has logged out, and the site resets your session. Does anyone know why upgrading to IIS7 would cause this behavior in Firefox? We've: 1) Reverted our application pool back to classic mode (no change); 2) Added a dummy value in the Global.asax object (no change); and 3) changed the web.config file from "authentication cookieless=autodetect" to "cookieless=usercookie" and back (no change).

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• Android: 2D. OpenGl or android.graphics?

  - by DroidIn.net

  I'm working with my friend on our first Android game. Basic idea is that every frame the whole surface is redrawn (1 large bitmap) which then sprinkled all over with large number of particles which produces effect of soapy bubbles where there's a pool of about 20 bitmaps which randomly gets picked to produce illusion that all bubbles (between 200 - 300) are all different. The math engine is in C (JNI) and currently all drawing is done using android.graphics package very similar (since that was the example I was using) to Lunar Lander. It works but animation is somewhat jerky and I can feel by temperature of my phone that it is very busy. Will we benefit from switching to OpenGL? And as a bonus question: what would be a good way to optimize the drawing mechanism (Lunar Lander like) we have now?

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• How to tell if a datareader is open on a connection and close it

  - by Earlz

  Hi, I'm setting up a little thing for connection pooling and on of the more common bugs that we have occur(its always an easy fix, but we just can't remember reader.Close()!) it is when we have a connection that is used by a lot of classes/methods and one method opens a data reader and forgets to close it. This isn't really bad cause a lot of times all you have to do is go into the debugger and go up one level and see the function before it was and check if it had an unclosed data reader. Now, here is the bigger problem. In this connection pool, if a datareader is open, then it's not known until a thread gets a connection and tries to use it and the thing that originally opened the data reader may no longer even be alive. So quite simply, how can you detect if a data reader is open on a connection and is there a way to close the reader without closing the connection?

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• ASP with Crystal Report 9 hangs on .NET framework 3.5

  - by Chris Yang

  We have an ASP (not ASP.NET) application running on Windows 2003 server. One of the functions of the application is to generate reports using Crystal Report 9. It has been working without any problem with .NET Framework 2.0 and now it is required to install .NET Framework 3.5 SP1 on the server but after we installed the 3.5 SP1, every time we run the application the Crystal report is not generated and the web page hangs so we have to recycle the application pool in IIS to get the application back going. Does anyone have any idea/solution to this problem? Any help will be greatly appreciate.

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• Cisco VPN Client Behind ASA 5505

  - by fdf33

  I'm trying to get connected to another ASA via Cisco VPN Client. I am behind an ASA 5505 myself and I am tryihng to VPN to a 5510. I get the message: Secure VPN Connection terminated locally by the Client. Reason 412: The remote peer is no longer responding. I can connect to the other ASA if I use a normal cheap Linksys. Here's the version of my ASA: Result of the command: "sh ver" Cisco Adaptive Security Appliance Software Version 8.4(1) Any help would be great. Thanks running-config : Saved : Written by enable_15 at 23:12:32.378 UTC Fri Jul 1 2011 ! ASA Version 8.4(1) ! hostname aaaasa domain-name aaa.local enable password xxxxxxxxxxxxxxx encrypted passwd xxxxxxxxxxxxxxxxxxxx encrypted names ! interface Vlan1 nameif inside security-level 100 ip address 192.168.1.254 255.255.255.0 ! interface Vlan2 nameif outside security-level 0 ip address xxx.xxx.xxx.xxx 255.255.254.0 ! interface Vlan5 no nameif security-level 50 ip address 172.16.0.254 255.255.255.0 ! interface Vlan500 no nameif security-level 100 ip address 10.10.10.1 255.255.255.0 ! interface Ethernet0/0 switchport access vlan 2 ! interface Ethernet0/1 ! interface Ethernet0/2 ! interface Ethernet0/3 ! interface Ethernet0/4 ! interface Ethernet0/5 ! interface Ethernet0/6 ! interface Ethernet0/7 ! boot system disk0:/asa841-k8.bin ftp mode passive dns domain-lookup inside dns domain-lookup outside dns server-group DefaultDNS name-server 4.2.2.2 domain-name aaa.local same-security-traffic permit inter-interface same-security-traffic permit intra-interface object network obj_any subnet 0.0.0.0 0.0.0.0 object network A_93.97.168.1 host 93.97.168.1 object network rdp host 192.168.1.2 object network NETWORK_OBJ_192.168.1.0_24 subnet 192.168.1.0 255.255.255.0 access-list 101 extended permit tcp any host 192.168.1.2 eq 3389 access-list 101 extended permit icmp any any echo-reply access-list 101 extended permit icmp any any source-quench access-list 101 extended permit icmp any any time-exceeded access-list 101 extended permit icmp any any unreachable access-list 102 extended permit ip any any pager lines 24 logging enable logging asdm informational mtu inside 1500 mtu outside 1492 ip local pool VPNPool 192.168.2.200-192.168.2.210 mask 255.255.255.0 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-641.bin no asdm history enable arp timeout 14400 ! object network rdp nat (inside,outside) static interface service tcp 3389 3389 ! nat (inside,outside) after-auto source dynamic any interface access-group 101 in interface outside access-group 102 out interface outside ! router ospf 1 network 192.168.1.0 255.255.255.0 area 0 log-adj-changes ! route outside 0.0.0.0 0.0.0.0 93.97.168.1 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute timeout tcp-proxy-reassembly 0:01:00 dynamic-access-policy-record DfltAccessPolicy http server enable http 192.168.1.0 255.255.255.0 inside no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart crypto ipsec ikev2 ipsec-proposal DES protocol esp encryption des protocol esp integrity sha-1 md5 crypto ipsec ikev2 ipsec-proposal 3DES protocol esp encryption 3des protocol esp integrity sha-1 md5 crypto ipsec ikev2 ipsec-proposal AES protocol esp encryption aes protocol esp integrity sha-1 md5 crypto ipsec ikev2 ipsec-proposal AES192 protocol esp encryption aes-192 protocol esp integrity sha-1 md5 crypto ipsec ikev2 ipsec-proposal AES256 protocol esp encryption aes-256 protocol esp integrity sha-1 md5 crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev2 ipsec-proposal AES256 AES192 AES 3DES DES crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP crypto map outside_map interface outside crypto ca trustpoint ASDM_TrustPoint0 enrollment self subject-name CN=ciscoasa proxy-ldc-issuer crl configure crypto ca certificate chain ASDM_TrustPoint0 certificate 8877d64d 30820248 308201b1 a0030201 02020488 77d64d30 0d06092a 864886f7 0d010105 05003036 3111300f 06035504 03130863 6973636f 61736131 21301f06 092a8648 86f70d01 09021612 63697363 6f617361 2e6e6a64 2e6c6f63 616c301e 170d3131 30353231 30383533 34325a17 0d323130 35313830 38353334 325a3036 3111300f 06035504 03130863 6973636f 61736131 21301f06 092a8648 86f70d01 09021612 63697363 6f617361 2e6e6a64 2e6c6f63 616c3081 9f300d06 092a8648 86f70d01 01010500 03818d00 30818902 818100ea 1aa95141 480e616c efee6816 a96d6511 313b6776 cd3dd57b cd84b4d2 5e108aee 7c980086 4d92e2eb b6c7bf66 4585af0a ccbf153a db9270be c6f5c67b db9dd8d1 2f78d033 3348b056 df4be0da 70e08953 53adf294 9db6c020 597d250f bf448b43 b90179c8 ff0b15d8 744632d9 31c1945f 0b11e258 b4c1d224 692efff4 7b2f5102 03010001 a3633061 300f0603 551d1301 01ff0405 30030101 ff300e06 03551d0f 0101ff04 04030201 86301f06 03551d23 04183016 8014493c 19db183a ab1af9e9 b1e44ad4 2a408b3c 89d1301d 0603551d 0e041604 14493c19 db183aab 1af9e9b1 e44ad42a 408b3c89 d1300d06 092a8648 86f70d01 01050500 03818100 1dd1760a fdd15941 4803fb9a cd6f44a7 2e275854 a1c0fbe1 d19f2cc9 182d43ef a547f854 8df96d15 3ea79c62 cf3fcb1c 5820360b c607dbfc 4de8bb16 19f727e9 b928a085 665816d8 138e4a35 ed610950 7910dd4a 0b1a9dd9 0e26f1c8 b78bc0cc cbf19eb2 4c4c3931 45199ea5 249e3266 661e44fd 7a00d376 dcfc6e4e d43f10b8 quit crypto isakmp nat-traversal 30 crypto ikev2 policy 1 encryption aes-256 integrity sha group 5 prf sha lifetime seconds 86400 crypto ikev2 policy 10 encryption aes-192 integrity sha group 5 prf sha lifetime seconds 86400 crypto ikev2 policy 20 encryption aes integrity sha group 5 prf sha lifetime seconds 86400 crypto ikev2 policy 30 encryption 3des integrity sha group 5 prf sha lifetime seconds 86400 crypto ikev2 policy 40 encryption des integrity sha group 5 prf sha lifetime seconds 86400 crypto ikev2 enable outside client-services port 443 crypto ikev2 remote-access trustpoint ASDM_TrustPoint0 telnet timeout 5 ssh 192.168.1.0 255.255.255.0 inside ssh timeout 5 console timeout 0 dhcpd auto_config outside ! dhcpd address 192.168.1.5-192.168.1.36 inside dhcpd dns 4.2.2.2 interface inside dhcpd enable inside ! threat-detection basic-threat threat-detection statistics host number-of-rate 3 threat-detection statistics port threat-detection statistics protocol threat-detection statistics access-list threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200 ntp server 82.219.4.31 source outside prefer ssl trust-point ASDM_TrustPoint0 outside webvpn enable outside anyconnect image disk0:/anyconnect-win-2.4.1012-k9.pkg 1 anyconnect profiles AnyConnectVPN_client_profile disk0:/AnyConnectVPN_client_profile.xml anyconnect profiles SSLAnyConnectVPN_client_profile disk0:/SSLAnyConnectVPN_client_profile.xml anyconnect enable tunnel-group-list enable group-policy GroupPolicy_AnyConnectVPN internal group-policy GroupPolicy_AnyConnectVPN attributes wins-server none dns-server value 4.2.2.2 vpn-tunnel-protocol ikev2 ssl-client ssl-clientless default-domain value aaa.local webvpn url-list none anyconnect profiles value AnyConnectVPN_client_profile type user group-policy GroupPolicy_SSLAnyConnectVPN internal group-policy GroupPolicy_SSLAnyConnectVPN attributes wins-server none dns-server value 4.2.2.2 vpn-tunnel-protocol ikev2 ssl-client default-domain value aaa.local webvpn anyconnect profiles value SSLAnyConnectVPN_client_profile type user username testuser password xxxxxxxxxxxxxxxxx encrypted privilege 0 username testuser attributes vpn-group-policy GroupPolicy_AnyConnectVPN tunnel-group SSLPOL type remote-access tunnel-group SSLPOL general-attributes default-group-policy GroupPolicy_AnyConnectVPN tunnel-group SSLAnyConnectVPN type remote-access tunnel-group SSLAnyConnectVPN general-attributes address-pool VPNPool default-group-policy GroupPolicy_SSLAnyConnectVPN tunnel-group SSLAnyConnectVPN webvpn-attributes group-alias SSLAnyConnectVPN enable ! class-map inspection_default match default-inspection-traffic ! ! policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect esmtp inspect ftp inspect h323 h225 inspect h323 ras inspect ip-options inspect netbios inspect rsh inspect rtsp inspect sip inspect skinny inspect sqlnet inspect sunrpc inspect tftp inspect xdmcp ! service-policy global_policy global prompt hostname context call-home profile CiscoTAC-1 no active destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService destination address email [email protected] destination transport-method http subscribe-to-alert-group diagnostic subscribe-to-alert-group environment subscribe-to-alert-group inventory periodic monthly subscribe-to-alert-group configuration periodic monthly subscribe-to-alert-group telemetry periodic daily Cryptochecksum:94a65341aa27d3929d5e92a32ba22120 : end

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• Managed language for scientific computing software

  - by heisen

  Scientific computing is algorithm intensive and can also be data intensive. It often needs to use a lot of memory to run analysis and release it before continuing with the next. Sometime it also uses memory pool to recycle memory for each analysis. Managed language is interesting here because it can allow the developer to concentrate on the application logic. Since it might need to deal with huge dataset, performance is important too. But how can we control memory and performance with managed language?

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• How to avoid this very heavy query that slows down the application?

  - by Juan Paredes

  Hi, We have a web application running in a production enviroment and at some point the client complained about how slow the application got. When we checked what was going on with the application and the database we discover this "precious" query that was being executed by several users at the same time (thus inflicting an extremely high load on the database server): SELECT NULL AS table_cat, o.owner AS table_schem, o.object_name AS table_name, o.object_type AS table_type, NULL AS remarks FROM all_objects o WHERE o.owner LIKE :1 ESCAPE :"SYS_B_0" AND o.object_name LIKE :2 ESCAPE :"SYS_B_1" AND o.object_type IN(:"SYS_B_2", :"SYS_B_3") ORDER BY table_type, table_schem, table_name Our application does not execute this query, I believe it is an Hibernate internal query. I've found little information on why Hibernate does this extremely heavy query, so any help in how to avoid it very much appreciated! The production enviroment information: Red Hat Enterprise Linux 5.3 (Tikanga), JDK 1.5, web container OC4J (whitin Oracle Application Server), Oracle Database 10.1.0.4, JDBC Driver for JDK 1.2 and 1.3, Hibernate version 3.2.6.ga, connection pool library C3P0 version 0.9.1. Thank you.

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• What's the best Communication Pattern for EJB3-based applications?

  - by Hank

  I'm starting a JEE project that needs to be strongly scalable. So far, the concept was: several Message Driven Beans, responsible for different parts of the architecture each MDB has a Session Bean injected, handling the business logic a couple of Entity Beans, providing access to the persistence layer communication between the different parts of the architecture via Request/Reply concept via JMS messages: MDB receives msg containing activity request uses its session bean to execute necessary business logic returns response object in msg to original requester The idea was that by de-coupling parts of the architecture from each other via the message bus, there is no limit to the scalability. Simply start more components - as long as they are connected to the same bus, we can grow and grow. Unfortunately, we're having massive problems with the request-reply concept. Transaction Mgmt seems to be in our way plenty. It seams that session beans are not supposed to consume messages?! Reading http://blogs.sun.com/fkieviet/entry/request_reply_from_an_ejb and http://forums.sun.com/message.jspa?messageID=10338789, I get the feeling that people actually recommend against the request/reply concept for EJBs. If that is the case, how do you communicate between your EJBs? (Remember, scalability is what I'm after) Details of my current setup: MDB 1 'TestController', uses (local) SLSB 1 'TestService' for business logic TestController.onMessage() makes TestService send a message to queue XYZ and requests a reply TestService uses Bean Managed Transactions TestService establishes a connection & session to the JMS broker via a joint connection factory upon initialization (@PostConstruct) TestService commits the transaction after sending, then begins another transaction and waits 10 sec for the response Message gets to MDB 2 'LocationController', which uses (local) SLSB 2 'LocationService' for business logic LocationController.onMessage() makes LocationService send a message back to the requested JMSReplyTo queue Same BMT concept, same @PostConstruct concept all use the same connection factory to access the broker Problem: The first message gets send (by SLSB 1) and received (by MDB 2) ok. The sending of the returning message (by SLSB 2) is fine as well. However, SLSB 1 never receives anything - it just times out. I tried without the messageSelector, no change, still no receiving message. Is it not ok to consume message by a session bean? SLSB 1 - TestService.java @Resource(name = "jms/mvs.MVSControllerFactory") private javax.jms.ConnectionFactory connectionFactory; @PostConstruct public void initialize() { try { jmsConnection = connectionFactory.createConnection(); session = jmsConnection.createSession(false, Session.AUTO_ACKNOWLEDGE); System.out.println("Connection to JMS Provider established"); } catch (Exception e) { } } public Serializable sendMessageWithResponse(Destination reqDest, Destination respDest, Serializable request) { Serializable response = null; try { utx.begin(); Random rand = new Random(); String correlationId = rand.nextLong() + "-" + (new Date()).getTime(); // prepare the sending message object ObjectMessage reqMsg = session.createObjectMessage(); reqMsg.setObject(request); reqMsg.setJMSReplyTo(respDest); reqMsg.setJMSCorrelationID(correlationId); // prepare the publishers and subscribers MessageProducer producer = session.createProducer(reqDest); // send the message producer.send(reqMsg); System.out.println("Request Message has been sent!"); utx.commit(); // need to start second transaction, otherwise the first msg never gets sent utx.begin(); MessageConsumer consumer = session.createConsumer(respDest, "JMSCorrelationID = '" + correlationId + "'"); jmsConnection.start(); ObjectMessage respMsg = (ObjectMessage) consumer.receive(10000L); utx.commit(); if (respMsg != null) { response = respMsg.getObject(); System.out.println("Response Message has been received!"); } else { // timeout waiting for response System.out.println("Timeout waiting for response!"); } } catch (Exception e) { } return response; } SLSB 2 - LocationService.Java (only the reply method, rest is same as above) public boolean reply(Message origMsg, Serializable o) { boolean rc = false; try { // check if we have necessary correlationID and replyTo destination if (!origMsg.getJMSCorrelationID().equals("") && (origMsg.getJMSReplyTo() != null)) { // prepare the payload utx.begin(); ObjectMessage msg = session.createObjectMessage(); msg.setObject(o); // make it a response msg.setJMSCorrelationID(origMsg.getJMSCorrelationID()); Destination dest = origMsg.getJMSReplyTo(); // send it MessageProducer producer = session.createProducer(dest); producer.send(msg); producer.close(); System.out.println("Reply Message has been sent"); utx.commit(); rc = true; } } catch (Exception e) {} return rc; } sun-resources.xml <admin-object-resource enabled="true" jndi-name="jms/mvs.LocationControllerRequest" res-type="javax.jms.Queue" res-adapter="jmsra"> <property name="Name" value="mvs.LocationControllerRequestQueue"/> </admin-object-resource> <admin-object-resource enabled="true" jndi-name="jms/mvs.LocationControllerResponse" res-type="javax.jms.Queue" res-adapter="jmsra"> <property name="Name" value="mvs.LocationControllerResponseQueue"/> </admin-object-resource> <connector-connection-pool name="jms/mvs.MVSControllerFactoryPool" connection-definition-name="javax.jms.QueueConnectionFactory" resource-adapter-name="jmsra"/> <connector-resource enabled="true" jndi-name="jms/mvs.MVSControllerFactory" pool-name="jms/mvs.MVSControllerFactoryPool" />

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• JDBC Realm: GlassFish v2.1 = OK; GlassFish v3 = fail with invaliduserreason

  - by Vik Gamov

  In my J2EE 5 application I have a JDBC Realm based security with Form method. Encrypt method is MD5 as default. The database is PostgreSQL 8.4 installed locally (or 8.3 available via lan). My app used to work finely on GlassFish v2.1 server with PostgreSQL 8.3, but now I need to deploy it on GlassFish v3. I am absolutely sure I have done all the same config on GFv3 like creating Connection Pool (which pings with no problem), JDBC Resource and JDBC Realm. But on GFv3 I get login exception with "invaliduserreason" while the database schema is just created from the working database script. I have checked the data and entered login/password thousand times and it seems that data is all right. So where can I find the reason of unworking security? Please, advice. NetBeans 6.8 Thanks.

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• Boost interprocess cached pools

  - by porgarmingduod

  I'm trying to figure out if my reading of the docs for boost interprocess allocators is correct. When using cached_adaptive_pool to allocate memory: typedef cached_adaptive_pool<int, managed_shared_memory::segment_manager> pool_allocator_t; pool_allocator_t pool_allocator(segment.get_segment_manager()); // Allocate an integer in the shared memory segment pool_allocator_t::pointer pool_allocator.allocate_one(); My understanding is that with multiple processes one can allocate and deallocate freely: That is, if I have a cached pool allocator for integers in one process, then it can deallocate integers allocated by similar pools in other processes (provided, of course, that they are working on the same shared memory segment). It may be a stupid question, but working with multiple processes and shared memory is hard enough, so I'd like to know 100% whether I got the basics right.

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• .NET Framework 4 RTM on Windows server 2008 R2

  - by mare

  I've just installed .NET 4 on Windows SErver 2008 R2 x64 and I am getting 500 Internal Server Error with an ASP.NET MVC application which was previously running fine on 3.5. The application was upgraded from targeting 3.5 to target 4 and I personally built it today on my development machine (changed in VS - Properties to .NET Framework 4). On the server I installed .NET Framework 4 Client profile and Full both automatically through the Web Platform Installer. ASP.NET MVC 2 was also installed through Platform Installer. I created a new .NET 4 application pool in IIS and placed the web app in it. Also I have custom errors turned Off in web.config but even so no detailed error is displayed - just the plain IIS 7.5 500 Internal Server Error. Any suggestions?

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• Can't resolve "UnauthorizedAccessException" with MVC 2 application running under IIS7

  - by Daniel Crenna

  We use MVC controllers that access System.File.IO in our application and they work fine in localhost (IIS 6.0-based Cassini). Deploying to IIS7, we have problems getting the controllers to work because they throw UnauthorizedAccessExceptions. We have done the following to try to resolve the issue: - Set NETWORK SERVICE and IUSR accounts to have permission on the files and folders in question - Ensured the App Pool is running under NETWORK SERVICE and loading the user profile - Application is running under full trust - We tried adding impersonation to web.config and giving NETWORK SERVICE write permissions Now, we alternate between getting UnauthorizedAccessException and an IIS7 404 page that suggests the routes are being ignored completely (for example we serve "/favicon.ico" via a controller when the physical file actually lives at /content/images/favicon.ico). We used ProcessMonitor to try to track down the issue but weren't successful.

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• Non-reentrant C# timer

  - by Oak

  I'm trying to invoke a method f() every t time, but if the previous invocation of f() has not finished yet, wait until it's finished. I've read a bit about the available timers (this is a useful link) but couldn't find any good way of doing what I want, save for manually writing it all. Any help about how to achieve this will be appreciated, though I fear I might not be able to find a simple solution using timers. To clarify, if x is one second, and f() runs the arbitrary durations I've written below, then: Step Operation Time taken 1 wait 1s 2 f() 0.6s 3 wait 0.4s (because f already took 0.6 seconds) 4 f() 10s 5 wait 0s (we're late) 6 f() 0.3s 7 wait 0.7s (we can disregard the debt from step 4) Notice that the nature of this timer is that f() will not need to be safe regarding re-entrance, and a thread pool of size 1 is enough here.

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• Netstat shows numerous CLOSE_WAIT states for mysql connections

  - by Sudheer

  The output of netstat -an shows many mysql connections in CLOSE_WAIT state and when i checked the processlist in mysql using 'SHOW PROCESSLIST' the connections shown in netstat do not appear. What possible could be the reason for this. I use tomcat with mysql-connector and use a Connection Pool as well. Is it that the application is not closing the mysql connection or is there any other reason for this behaviour... sometimes the CLOSE_WAIT reaches over 200. On the application level i made sure that i close all the connections(make sure i issue a close() command in the finally block) created using jdbc. Any help would be appreciated.

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• JMS Session pooling for large numbers of Topic subscribers

  - by matthewKizoom

  I'm writing an app that will create lots of JMS topic subscribers. What is best practise regarding reusing sessions? A session per subscriber? A pool of sessions? With a session per subscriber the thread count seems unreasonable. Is this a job for something like a ServerSessionPool? What I've seen so far seems to suggest that ServerSessionPool is more geared towards one receiver consuming messages concurrently rather than lots of receivers. I'm currently working with HornetQ 2.0.0GA embedded in JBoss 4.3.0CP6.

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• good documentation about "avoid catching throwable", in context of weblogic server

  - by Marcel

  hi all, i am currently refactoring an existing codebase (EJBs...) to rip out all blocks where a Throwable is catched inside of the EJB. try { ... do some business logic } catch(Throwable t){ ... log and swallow ... :-( } i want/need to convince the people around me with proper documentation that "catching throwable" is a no-go for an EJB (we have lots of discussions around this :-(( ). weblogic will handle all the "Error" conditions and maybe invalidate EJBs and put fresh(working) EJBs into the pool. catching Throwable would undermine all these security nets provided by weblogic. and catching throwable is bad practice anyway (but people here are reluctant and use the "throwable" hammer everywhere). is anyone able to point me to some online docs where this behaviour is explained (for weblogic or jboss or...). i searched via google and had a look at the weblogic docs but wasn't able to find anything, just generic java doc. any help highly appreciated cheers marcel

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• FBA site owner encounter access deny in sharepoint 2007

  - by intangible02

  I created a sharepoint 2007 publishing site first using windows authentication, then extended it to another site using FBA. I created a FBA user and set it as site collection admin as well as top site owner. I also make application pool which the FBA site is running in to run with a user account which is within administrator group. But I encounter access deny error when browsing certain links using this site owner account. Is there other settings I need to configure? I found in the web.config, the impersonation is set to true. How does this affect the access rights?

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• NSStream sockets missing data

  - by Chris T.

  I am trying to pull some sample data from FreeDB as a proof of concept, but I am having a tough time retrieving all of the data off the incoming stream (I am only getting the last bits for the final query listed here (if handshakeCode = 3) I think this may be something with the threading on the main runloop, but I am not sure. Odd thing is when the buffer size is larger than 1-2 bytes (which works as expected), I seem to be losing access to the data programmatically (the totalOutput variable on the first set of data is incomplete). I set up a packet capture, and it looks like those 1024 bytes are coming across the wire, but the app just isn't working with it. It looks like the next event is coming through and basically taking over. I tried using an NSLock to no avail as well. If I drop the buffer size down to 1 or 2, things seem to be reading just fine. This is probably obvious to someone who does this all the time, but this is my first foray into this with something I am familiar with, technology wise in other languages / platforms. The following code will show you what is happening. Run with the buffer set to 1024, and you will see a short final string, but once you set it to 1, you will see the amount of data I was expecting (I was even expecting it to be split, so that's not a big worry) #import <Foundation/Foundation.h> #import <Cocoa/Cocoa.h> //STACK OVERFLOW CODE: @interface stackoverflow : NSObject <NSStreamDelegate> { NSInputStream *iStream; NSOutputStream *oStream; int handshakeCode; NSString *selectedDiscId; NSString *selectedGenre; } -(void)getMatchesFromFreeDB; -(void)sendToOutputStream:(NSString*)command; @end @implementation stackoverflow -(void)getMatchesFromFreeDB { NSHost *host = [NSHost hostWithName:@"freedb.freedb.org"]; [NSStream getStreamsToHost:host port:8880 inputStream:&iStream outputStream:&oStream]; [iStream retain]; [oStream retain]; [iStream setDelegate:self]; [oStream setDelegate:self]; [iStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [oStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [iStream open]; [oStream open]; handshakeCode = 0; //not done any processing } -(void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode { switch(eventCode) { case NSStreamEventOpenCompleted: { NSLog(@"Stream open completed"); break; } case NSStreamEventHasBytesAvailable: { NSLog(@"Stream has bytes available"); if (aStream == iStream) { NSMutableString *totalOutput = [NSMutableString stringWithString:@""]; //read data uint8_t buffer[1024]; int len; while ([iStream hasBytesAvailable]) { len = [iStream read:buffer maxLength:sizeof(buffer)]; if (len 0) { NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSUTF8StringEncoding]; //this could have also been put into an NSData object if (nil != output) { //append to the total output [totalOutput appendString:output]; } } } NSLog(@"OUTPUT , %i:\n\n%@", [totalOutput lengthOfBytesUsingEncoding:NSUTF8StringEncoding], totalOutput); NSArray *outputComponents = [totalOutput componentsSeparatedByString:@" "]; //Attempt to get handshake code, since we haven't done it yet: if (handshakeCode == 1) { //we are just getting the sign-on banner: //let's move on: handshakeCode = 2; } else if (handshakeCode == 2) { handshakeCode = [[outputComponents objectAtIndex:0] intValue]; if (handshakeCode == 200) { NSLog(@"---Handshake OK %i", handshakeCode); NSMutableString *query = [NSMutableString stringWithString:@"cddb query f3114b11 17 225 19915 36489 54850 69425 87025 103948 123242 136075 152817 178335 192850 211677 235104 262090 284882 308658 4430\n"]; handshakeCode = 3; [self sendToOutputStream:query]; } } else if (handshakeCode == 3) { //now, we are reading out the matches: if ([[outputComponents objectAtIndex:0] intValue] == 200) //found exact match: { NSLog(@"Found exact match"); selectedGenre = [outputComponents objectAtIndex:1] ; selectedDiscId = [outputComponents objectAtIndex:2]; if (selectedGenre && selectedDiscId) { //send off the request to get the entry: NSString *query = [NSString stringWithFormat:@"cddb read %@ %@\n", selectedGenre, selectedDiscId]; [self sendToOutputStream:query]; handshakeCode = 4; } } } } break; } case NSStreamEventEndEncountered: { NSLog(@"Stream event end encountered"); break; } case NSStreamEventErrorOccurred: { NSLog(@"Stream error occurred"); break; } case NSStreamEventHasSpaceAvailable: { NSLog(@"Stream has space available"); if (aStream == oStream) { if (handshakeCode == 0) { handshakeCode = 1; [self sendToOutputStream:@"cddb hello stackoverflow localhost.localdomain test .01BETA\n"]; } } break; } } } -(void)sendToOutputStream:(NSString*)command { const uint8_t *rawCommand = (const uint8_t *)[command UTF8String]; [oStream write:rawCommand maxLength:strlen(rawCommand)]; NSLog(@"Sent command: %@",command); } @end int main (int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; stackoverflow *test = [[stackoverflow alloc] init]; [test getMatchesFromFreeDB]; NSRunLoop *runLoop = [NSRunLoop currentRunLoop]; [runLoop run]; [pool drain]; return 0; } Any help is much appreciated! Thanks

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• Asp.Net application/web service not working on Vista/IIS7: access right problem?

  - by Achim

  I have an .Net 3.5 based web service running at http://localhost/serivce.svc/. Then I have a Asp.Net application running at http://localhost/myApp. In Application_Load my App reads some XML configuration from the web service. That works fine on my machine, but: On Vista with IIS7 the request to the web services fails. The web service can be accessed via the browser without any problem. I configured the app pool of my App to run as admin. I added the admin to the IIS_USRS group, but it still cannot access the web service. impersonate=true/false seems not to make a difference.

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• accepts_nested_attributes_for and has_many :through relations.

  - by antiarchitect

  I want to make a simple examing application on RoR 2.3. The problem area is to make an exam_session in a one form with only one submit action. For the exam session there are selected some number of questions from the question pool in random order. For these questions there are selected some number of alternatives (to check is this a single answer question or multi answer question I use the number of correct alternatives: if only 1 - single, 1 - multi. Radiobuttons or checkboxes in form to answer depends on it). I have models: Questions ---< Alternative and ExamSession. I think there must be has_many :through relations between ExamSession and Questions and has_many :through relation between the intermediate table (for example QuestionsExamSession) and Alternative to point what alternatives are answers of the student on this Question. So the questions are: Is this scheme is too complicated and there is a way to do it simple and clear? Is there any way to organize models in such a way to make the form I want to work?

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• debugging error -- error attaching to w3wp.exe

  - by George2

  Hello everyone, I am using VSTS 2008 + .Net 3.5 + C#. And I developed a custom Forms authentication module for IIS 7.0 and I attach to w3wp.exe to debug this module. During the attach process (I just select Tools - Attach to Process, no further operation performed on the computer I am debugging -- I just wait for the attach to be completed), I met with the following error, any ideas what is wrong? The web server process that was being debugged has been terminated by Internet Information Services (IIS). This can be avoided by configuring Application Pool ping settings in IIS. See help for further details. thanks in advance, George

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• Raise event from http listener (Async listener handler)

  - by Sean

  Hello, I have created an simple web server, leveraging .NET HttpListener class. I am using ThreadPool.QueueUserWorkItem() to spawn a thread to listen to incoming requests. Threaded method uses HttpListener.BeginGetContext(callback, listener), and in callback method I resume with HttpListener.EndGetContext() as well as raise an even to notify UI that listener received data. This is the question - how to raise that event? Initially I used ThreadPool: ThreadPool.QueueUserWorkItem(state => ReceivedRequest(httpListenerContext, receivedRequestArgs)); But then started to doubt, maybe it should be a dedicated thread (as appose to waiting for a thread from pool): new Thread(() => ReceivedRequest(httpListenerContext, receivedRequestArgs)).Start(); Thoughts? 10X

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• Using Parallel Extensions with ThreadStatic attribute. Could it leak memory?

  - by the-locster

  I'm using Parallel Extensions fairly heavily and I've just now encountered a case where using thread locla storrage might be sensible to allow re-use of objects by worker threads. As such I was lookign at the ThreadStatic attribute which marks a static field/variable as having a unique value per thread. It seems to me that it would be unwise to use PE with the ThreadStatic attribute without any guarantee of thread re-use by PE. That is, if threads are created and destroyed to some degree would the variables (and thus objects they point to) remain in thread local storage for some indeterminate amount of time, thus causing a memory leak? Or perhaps the thread storage is tied to the threads and disposed of when the threads are disposed? But then you still potentially have threads in a pool that are longed lived and that accumulate thread local storage from various pieces of code the threads are used for. Is there a better approach to obtaining thread local storage with PE? Thankyou.

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