[JBoss-user] [Performance Tuning] - Re: SessionBean vs. Static Method
I'd prefer staless bean which operates with local enity beans. It should be slower than usual static method but it will bring all the advances from message above. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3948884#3948884 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3948884 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Performance Tuning] - Re: SessionBean vs. Static Method
Static methods live inside one virtual machine and it is you who must take resposibility to "scale" solution and take other decisions on mny other issues. On other hand, J2EE containers does much the dirty work for you. You just need to give some details in deplayment descriptors. Container will decide how many instances of the loader/saved it needs to serve all incoming requests with optimal latency. Also J2EE edition of the loader/saver might be scaleable between many machines if J2ee container supports scaling. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3948882#3948882 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3948882 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Re: Single UPDATE instead of SELECT, then UPDATE
The problem has been solved.
I'd like to share the story.
The question was going from obivious lack of J2EE and JBoss experience and
understanding.
I was absolutely sure that dataSource.getConnection() returns free connection
and this free connection means new transaction.
I've had tried to use same datasource for cmp beans and session beans. Lets say
it is registered as java:jdbc/cmp in global evinonent (possibly other
depoyments use java:DefaultDS or java:MySqlDS).
I've placed a ref link to it for my Session bean Cashier. In xdoclet attributes
it looks like:
| @ejb.resource-ref res-ref-name="dataSource" ref-type="javax.sql.DataSource"
jndi-name="java:jdbc/cmp" res-auth="Container"
| @jboss.resource-ref res-ref-name="dataSource" jndi-name="java:jdbc/cmp"
|
Cashier session bean has a private field of javax.sql.DataSource type
dataSource. It is being initialized in ejbCreate()
| public void ejbCreate() throws CreateException {
|try {
| InitialContext ctx = new InitialContext();
| this.dataSource = (DataSource) ctx.lookup("java:comp/env/dataSource");
| //
|} catch (NamingException nEx) {
| throw new RuntimeException(nEx);
|}
| }
|
Now dataSource field is usable.
So deposit() method from example above has changed to
| public void deposit(Integer customerId, int value) throws RemoteException {
| Connection conn = null;
| try {
|conn = this.dataSource.getConnection();
|PreparedStatement stmt = conn.prepareStatement("UPDATE customer SET
credits=credits+? WHERE id =?");
|stmt.setInt(1, value);
|stmt.setObject(2, customerId);
|stmt.executeUpdate();
| } catch {
| /// bla bla. catch some common exceptions
| } finally {
|if(conn != null) {
|try {
| conn.close();
|} catch (SQLException sqlEx) {
| // log error
|}
|}
| }
| }
|
That is really simple and was hard for me to believe.
Queries generated inside new deposit method come inside transaction which is
managed by container! (I've verified it from mysql query logs). It is forbidden
to use conn.commit(), conn.rollback() and conn.setAutoComint(...) methods, an
exception will be thrown and whole transaction will be rolled back.
Similar solution has been applied to many methods for local edition of the
Cashier bean.
Total application has been stress tested with REPETABLE_READ isolation level
for mysql. Works perfectly.
At least one drawback indeed exist, now sql code moved to java code (or
deployment descriptors). It is not very beautiful to my humble opinion.
P.S. Next question of curiosity. Will other containers behave in the same way?
I hope it will never come to find an answer myself :).
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[JBoss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Re: Automatic generation of primary key
I don't know what it could be then :(. As far as i understand, general idea of pk generation is to tell EJB engine what type (class) of pk it will be, and tell details to jboss personally. Something about integer type should be mentioned in ejb-jar.xml and particular instructions in jbosscmp-jdbc.xml How your ejbCreate and ejbPostCreate looks like? It should not contain pk field in signature and no calls to pk inside i mean nothing of getId() (could be not assigned yet) and setId(id) will override autoincremented value. That is just my current understanding, it works for me. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3948702#3948702 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3948702 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB/JBoss] - Re: Single UPDATE instead of SELECT, then UPDATE
Oh, same on me... wrong forum. Somebody please remove topic from here. I've already reposted it to "Persistance" forum http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3948303#3948303 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3948304#3948304 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3948304 --- All the advantages of Linux Managed Hosting--Without the Cost and Risk! Fully trained technicians. The highest number of Red Hat certifications in the hosting industry. Fanatical Support. Click to learn more http://sel.as-us.falkag.net/sel?cmd=lnk&kid=107521&bid=248729&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Persistence,JBoss/CMP, Hibernate, Database] - Single UPDATE instead of SELECT, then UPDATE
Good afternoon.
Common entty bean contain a number of set and get methods. Here we have a
Customer bean with field named credits.
Also we have a Session bean named Cashier with deposit method. In general this
method looks like:
|
| public void deposit(Integer customerId, int value) throws RemoteException {
| try {
| CustomerLocal customer =
this.customerHome.findByPrimaryKey(customerId);
| int credits = customer.getCredits()+value;
| if(credits < 0) {
|throw new OutOfCreditsBuisenessException("");
| }
| customer.setCredits(credits);
| } catch {
| /// bla bla. catch some common exceptions
| }
| }
|
Invocation of this method results in two queries
1) SELECT credits FROM customer WHERE id=?
2) UPDATE customer SET credits=? WHERE id=?
That is good enoght for those who are using SERIALIZABLE tx isolation level. We
can not afford it with mysql here, the level leads to locks on customer table
(i.e. customer spends credits and deposits it a same time) and we have to use
REPETABLE_READ instead.
Is that possible somehow to merge two queries to one like:
UPDATE customer SET credits=credits+? WHERE id=?
I know that it is possible by using direct connection with db. But this will
mean new transaction per each deposit. Is that avoidable?
Could it be that SERIALIZABLE tx isolation level is a weak point of mysql and
we should consider migration to another db?
Thanks for attention.
P.s. Don't know if this forum best place for such a question. Hits where
shold-I-place-the-question are welcome too :).
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[JBoss-user] [EJB/JBoss] - Single UPDATE instead of SELECT, then UPDATE
Good afternoon.
Common entty bean contain a number of set and get methods. Here we have a
Customer bean with field named credits.
Also we have a Session bean named Cashier with deposit method. In general this
method looks like:
| public void deposit(Integer customerId, int value) throws RemoteException {
| try {
| CustomerLocal customer =
this.customerHome.findByPrimaryKey(customerId);
| int credits = customer.getCredits()+value;
| if(credits < 0) {
|throw new OutOfCreditsBuisenessException("");
| }
| customer.setCredits(credits);
| } catch {
| /// bla bla. catch some common exceptions
| }
| }
|
Invocation of this method results in two queries
1) SELECT credits FROM customer WHERE id=?
2) UPDATE customer SET credits=? WHERE id=?
That is good enoght for those who are using SERIALIZABLE tx isolation level. We
can not afford it with mysql here, the level leads to locks on customer table
(i.e. customer spends credits and deposits it a same time) and we have to use
REPETABLE_READ instead.
Is that possible somehow to merge two queries to one like:
UPDATE customer SET credits=credits+? WHERE id=?
I know that it is possible by using direct connection with db. But this will
mean new transaction per each deposit. Is that avoidable?
Could it be that SERIALIZABLE tx isolation level is a weak point of mysql and
we should consider migration to another db?
Thanks for attention.
P.s. Don't know if this forum best place for such a question. Hits where
shold-I-place-the-question are welcome too :).
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3948290#3948290
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[JBoss-user] [Messaging, JMS & JBossMQ] - Re: Memory leak and tons of org.jboss.mq.SpyTopic and org.jb
For those who will find this topic as answer to mysql "connection reset" search query. The problem has been solved too. Connection have had been really closed by mysql. It was and is set up with WAIT_TIMEOUT less than 1 minute (I guess that admin had tried to minimize connection leaks for php ?) I have changed connection string in -ds.xml file to jdbc:mysql://spinity.com:3306/java?autoReconnectForPools=true&sessionVariables=wait_timeout=28800 (don't forget to mark the string as CDATA) note sessionVariables=wait_timeout=28800 I'm not sure that autoReconnectForPools is a good idea. Useful links http://dev.mysql.com/doc/refman/5.0/en/cj-configuration-properties.html http://wiki.jboss.org/wiki/Wiki.jsp?page=SetUpAMysqlDatasource (here stated that autoReconnect is not a good idea, but nothing about autoReconnectForPools). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3926780#3926780 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3926780 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Messaging, JMS & JBossMQ] - Re: Memory leak and tons of org.jboss.mq.SpyTopic and org.jb
"hosierdm" wrote : Why are you explicitly acknowledging your messages in the client when you clearly have the session set to auto acknowledge? That is undoubtly kind of mistake (or more likely mess) in code. Now it fixed. - - - About JIRA. Adrian, should i place it there or better not? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3924771#3924771 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3924771 --- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Messaging, JMS & JBossMQ] - Re: Memory leak and tons of org.jboss.mq.SpyTopic and org.jb
One leak source has been found. Producer sessions were started as (note false) session = conn.createTopicSession(false, TopicSession.AUTO_ACKNOWLEDGE); Consumer sessions started as (note true) session = conn.createTopicSession(true, TopicSession.AUTO_ACKNOWLEDGE); and onMessage(message) contains message.acknowledge(); I think that since producer was not transactional and was with AUTO_ACKNOWLEDGE flag, each time when clint call to message.acknowledge(); instance of org.jboss.mq.AcknowledgementRequest was created. --- I've replased true to false in client side and have removed message.acknowledge(). It helped much! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3924556#3924556 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3924556 --- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Messaging, JMS & JBossMQ] - Re: JBoss 3.2.5 Deployment Errors
I would say that your some of your .xml files are broken. Try to check'em using some xml reader. IE will be enought. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3923968#3923968 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3923968 --- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Messaging, JMS & JBossMQ] - Additional information.
configuration Jboss 4.0.3 JDK 1.5.0_06 SunOS 5.9 Generic_118559-09 i86pc i386 i86pc mysql 4.1 I've noticed that SELECT count(*) FROM JMS_MESSAGES returns amount of org.jboss.mq.AcknowledgementRequest and org.jboss.mq.SpyTopic objects in jmap -histo output. What could it mean? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3923887#3923887 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3923887 --- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Messaging, JMS & JBossMQ] - Re: Memory leak and tons of org.jboss.mq.SpyTopic and org.jb
Forgot to place question. Does anybody have ideas how to 1) eliminate memory leaks 2) connection resets from mysql ? Thanks for advance. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3923806#3923806 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3923806 --- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Messaging, JMS & JBossMQ] - Memory leak and tons of org.jboss.mq.SpyTopic and org.jboss.
Hello people.
I'm new to JBoss (~month of experience), however i've migrated production
installation of project to JBoss from SunApplication server.
It runs much better, but we're now facing memory leak.
We're running jboss as application server and some socket daemons as clients
for the server.
Now both (client and server) consumes memory. I've compared "jmap -histo pid"
results for client after 12 hours of heavy load.
It is obivious that amount
org.jboss.mq.SpyTopic and
org.jboss.mq.AcknowledgementRequest has grown
Was (1column is bytes, 2nd - amount of instances, 3d - class name):
anonymous wrote : 182016 7584org.jboss.mq.SpyTopic
| 181992 7583org.jboss.mq.AcknowledgementReque
|
After 12 hours
anonymous wrote :
| 917760 38240 org.jboss.mq.SpyTopic
| 917736 38239 org.jboss.mq.AcknowledgementRequest
|
The client-server uses JMS communication a lot.
Client message handler:
| public void onMessage(javax.jms.Message message) {
| try {
| message.acknowledge();
| MapMessage mapMessage = (MapMessage) message;
|//...actions on message
| } catch (JMSException jmsEx) {
| logger.log(Level.INFO, "Error processing message", jmsEx);
| } catch (ClassCastException cCEx) {
| logger.fine(cCEx.getMessage());
| }
|
| }
|
Server side (in session and eninty beans) message producer
| private void notifyClientListeners(Integer playerId, String serverId) {
| try {
| TopicSession session = null;
| Topic topic = this.serverTopic; // acquired in
ejbCreate from JNDI env.
| TopicConnectionFactory tcf = this.jmsFactory; //
acquired in ejbCreate from JNDI env.
| TopicConnection conn =
tcf.createTopicConnection(this.jmsUserName, this.jmsUserPassword);
|
| session = conn.createTopicSession(false,
TopicSession.AUTO_ACKNOWLEDGE);
| conn.start();
|
| TopicPublisher send = session.createPublisher(topic);
|
| MapMessage mapMessage = session.createMapMessage();
| mapMessage.setString(JMSConstants.JMS_MESSAGE_NAME,
JMSConstants.JMS_PLAYER_CONNECT);
| mapMessage.setInt(JMSConstants.JMS_PLAYER_ID,
playerId.intValue());
| mapMessage.setString(JMSConstants.JMS_SERVER_ID, serverId);
|
| send.publish(mapMessage);
|
| send.close();
| session.close();
| conn.close();
| } catch (Exception ex) {
| logger.log(Level.WARNING, "Unable to notify servers", ex);
| }
| }
|
JMS connectivity works using mysql. Here we have a error too. Sometimes
following error occures:
anonymous wrote : 06:25:45,394 WARN [LocalManagedConnectionFactory] Destroying
connection that is not valid, due to the following exception: [EMAIL PROTECTED]
| com.mysql.jdbc.CommunicationsException: Communications link failure due to
underlying exception:
|
| ** BEGIN NESTED EXCEPTION **
|
| java.net.SocketException
| MESSAGE: Connection reset
|
| STACKTRACE:
|
| java.net.SocketException: Connection reset
| at java.net.SocketInputStream.read(SocketInputStream.java:113)
| at
com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
|
This error occures in many cases, JMS, entiny beans and so on. But we don't
have data loss.
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[JBoss-user] [Persistence,JBoss/CMP, Hibernate, Database] - Re: WARN [TxConnectionManager] Connection error occured
Good afternood. I've faced this problem too. Actually i don't know what is it, but it doesn't affect my project since i've added this line to datasource setup file. SELECT 1 My configuration is Solaris/JBoss 4.0.3/mysql 4.1 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3923605#3923605 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3923605 --- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
