[jboss-user] [JBoss Seam] - Re: seam and batch/queue-processing

[motte79]

@kenglover: Thanks, but i'm using Quartz not EJB-Timers. I'm sorry, should have told it.

@pete.muir: I tried the approach by scheduling an asynchronous task at startup, which performs some operations and gives the control for the next operation to a new asynchronous task. This works fine for some time, but it always ends up in a java.lang.StackOverflowError.


  | Caused by: java.lang.StackOverflowError
  |         at java.lang.ClassLoader.findBootstrapClass(Native Method)
  |         at java.lang.ClassLoader.findBootstrapClass0(ClassLoader.java:891)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:301)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
  |         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
  |         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
  |         at org.apache.log4j.spi.ThrowableInformation.getThrowableStrRep(ThrowableInformation.java:58)
  |         at org.apache.log4j.spi.LoggingEvent.getThrowableStrRep(LoggingEvent.java:342)
  |         at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:304)
  |         at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.java:236)
  |         at org.apache.log4j.WriterAppender.append(WriterAppender.java:159)
  |         at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:230)
  |         at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:65)
  |         at org.apache.log4j.Category.callAppenders(Category.java:203)
  |         at org.apache.log4j.Category.forcedLog(Category.java:388)
  |         at org.apache.log4j.Category.log(Category.java:853)
  |         at org.jboss.seam.log.Log4JProvider.error(Log4JProvider.java:57)
  |         at org.jboss.seam.log.LogImpl.error(LogImpl.java:121)
  | 

The new instance is created by calling.


  | (Task)	Component.getInstance(Task.NAME, ScopeType.STATELESS, true);
  | 

I'm a little frustrated about this .. 

I'd like to poll the database for new messages (they are stored in a table) and perform some tasks/checks with it to get it into another sink (another table).
It's a system where n foreign processes send messages via http/POST. They get serialized into the first table and are processed later in a synchron recurring way by the Task. (because reordering has to be done, etc.)






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