March 2009 - jboss-user - Jboss List Archives

[JBoss Messaging] - Re: Viewing Messages in a JMS queue

by gaohoward

Hi , in JBM 1.4,for a queue the message count you see from jmx console means the sum of messages not delivered (including scheduled), messages being delivered (not acknowledged), and messages are paged into disk. For a topic, it is the sum of the above for all the subscribers. Please indicate the exact name of the methods so I can take a look. thanks. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220105#4220105 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220105

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[Security & JAAS/JBoss] - Re: Anyway of removing the MDB username and password from th

by thai777

Thank you for your reply jaikiran. The problem with using the -D option for the JVM will mean that anyone logged on to the machine will be able to view the username and password when they view the process using the ps command. However, I think you have just made me realised that we will be deploying on a Windows server for this application and will be using the Windows Service process to start JBoss so that might not pose a after all (i.e. we can use the -D option). Am I right? Will confirm this now. Still, it will be good to find out what was the problem with the properties-service.xml not loading for jboss.xml. Thanks, -Thai View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220104#4220104 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220104

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[EJB 3.0] - Re: javax.persistence.EntityNotFoundException: deleted entit

by jochen.reinhardt

Amendment to my last post: I guess, this may also happen in a recursive manner. I mean, having some entity types A and B, by deleting some instance of A you may get: delete A, delete all B referenced by A delete all A referenced by all B's affected by step 2 and so on... Please correct me, f I am mistaken... View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220103#4220103 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220103

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[EJB 3.0] - Re: javax.persistence.EntityNotFoundException: deleted entit

by jochen.reinhardt

Hi! Strange name, but OK... Please post your full error message with stack trace. Nevertheless, it seems to me like you have some on delete cascade in your m:n relationship. I can't really tell, may be you remove some referenced entities, and afterwards, you remove the referencing entity, which in turn tries to delete the referenced entities again. So please be more precise about your m:n relationship. Best regards, Jochen View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220102#4220102 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220102

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[EJB 3.0] - Re: persistence problem

by jochen.reinhardt

What about: this.persistenceManager.persist(...) ? Just a joke :D Look at your previous post for a possible answer... Cheers, Jochen View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220101#4220101 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220101

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[Persistence, JBoss/CMP, Hibernate, Database] - Re: Entities in clustered environment

by jochen.reinhardt

Hi, I must admit, I am new to clustering with JBoss. But I am currently learning for an exam for MySQL cluster. That would be what you called an high end database cluster ;-). The cost is 0,00$ or whatever currency you prefer :-D I guess having several databases is not feasable. There would be too much work to do for replacating between them. And as DB replication is usually done in an asynchronous way, you will never know when the second database applies the latest changes. As far as I know, replication is used for backup-purposes and cold standby. That means, you use the slave to do backups while the master is still running - stopping relplication during backup allows to make a consistent backup. In the second scenario, you change the application configuration to fall back to the replication slave when the master fails. This usually will cause loss of some data. As the updates happen asynchronously, there is no transaction support. I guess that can't be used for JBoss clustering. Instead, using a clustered database is what I would recommend. In case of MySQL, you'll have some NDB nodes, storing and retrieving cluster data in main memory, and several MySQL server nodes for accessing the cluster via SQL. A typical setup would be having four NDB nodes, two MySQL nodes and at least one management node for setting up and monitoring the cluster. I think, in a JBoss Cluster made up of two nodes, you should be able to use the MySQL server nodes as datasources. Your APP / \ AS1 <------> AS2 | | MySQL1 MySQL2 | | NDB1 <------> NDB2 | X | NDB3 <------> NDB4 Your APP: your application with some kind of interface to the user / caller. You could also be able to add some kind of load balancing proxy on top of your setup. AS: JBoss Application Server MySQL: MySQL server node NDB: MySQL cluster data node This way the DB would not be your single point of failure, as it is HA by design. But as I said, I really do not have any idea about JBoss clustering, so it may be that I am wrong in some points. But from a DB point of view, this would be a recommended setup. Best regards, Jochen PS: Clustering is very expensive, if you want to do it right. All componenent have to exist at leas twice. This is also true for your network equipment. E.g connecting all nodes using one switch will make the switch your single point of failure and so on... View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220100#4220100 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220100

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[EJB 3.0] - Re: many to many mapping problem

by jochen.reinhardt

The messages indicate, that you do not have your primary key set correctly. I think you have to do that manually. It's a bit tricky, as your primary key for skill level is a composition of two foreign keys. I think you have to correct that... I solved the problem by adding @Column (in the primary key class) and @JoinColumn (for your releationships) and @AttributeOverride (for your embedded primary key) annotation. For the JoinColumn, I had to set insertable and updateable to false, as the columns will be generated by the primary key. Use the same names for the columns in your primary key class as for the JoinColumns. I guess hibernate will have created distinct columns for your primary key and your relationship definition, but that's not what you really wanted. Check your schema to see what hibernat actually does on database level! Before saving your entities, be sure to set all fields of your bean. The primary key AND your relation fields - this feels like doing a little bit of work twice, but I think it turns out to be correct. For your relationships, try to find the correct settings for cascading. E.g, when you remove a vendor, you will also want that all skill levels for that vendor be removed. When you remove a skill, you may want that all skill levels be removed. Either use cascading or do it manually in your code. Good luck! Jochen View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220099#4220099 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220099

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[Security & JAAS/JBoss] - two authorization/authenications mechanisms in one j2ee app

by adamzrk

Hi I've got big problem. There is the system on which I do work, it uses NTLM to autheticate the user. There is special authenticator - the same like NtlmHttpFilter from Jcifs, but not a servlet - a special class (which is derived from AuthenticationBase from tomcat jars) packaged as jar together with login module, which I use in my app. Login module is used to authorise the user - retrieves roles from database. When user enteres the app url in the browser it is automatically logged in when she/he is logged in the domain. But when not - the browser shows the window to log in. I need in my app the second way to authenticate and authorise the user - login and password should be matched with these from db. I wrote a special jsp and servlet to do that. I also wrote loginModule to log user from db. But how can I do authorisation - so that user roles are retrieved correctly? Application uses ejb3 and user principal must be in the sessioncontext. Is that possible? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220098#4220098 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220098

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[JBoss AOP] - Pointcut intercepting methods with annotated arguments

by jarr

Is it possible to write a pointcut to intercept execution of some method which has some of its arguments annotated with certain annotation. For example method declared as follows: void someMethod(@SomeAnnotation String arg1) {...} It would be nice if pointcut like this would be possible: execution(* *->*(@SomeAnnotation *)) or even better: execution(* *->*(.., @SomeAnnotation *, ..)) - it would mean, that pointcut should match execution of any method with any of its arguments being annotated with @SomeAnnotation. If such pointcut worked it would be trivial to implement an aspect checking not null conditions on method arguments: void exampleMethod(String nullable, @NotNull String notNullable) {...} Regards Jarek View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220096#4220096 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220096

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[EJB 3.0] - javax.persistence.EntityNotFoundException: deleted entity pa

by abcdefghijklmnop

I get this exception everytime I try to delete an entity. There is a many-to-many reference within this entity. Before deleting an entity, I delete the references, which works fine. But the entity itself won't delete. The same exception appears when deleting entities that have no references at all. So I don't know where this comes from and how to solve. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220090#4220090 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4220090

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jboss-user March 2009