[Persistence, JBoss/CMP, Hibernate, Database] - EntityManager.flush not flushing
by DaHunter
Hi,
I have created an EJB 3.0 application that consists of EJBs and JSP pages. I have a problem where a call to EntityManager.flush in a stateless session bean seems to be ignored. Here is what is happening:
A timer kicks off a stateless session been every X minutes. This bean does some work, sends an HTTP POST to another server and then logs an entry in an Oracle database that records that it sent the POST. This is done in a loop that could run 10 times, or hundreds of times. So every iteration of the loop makes an HTTP POST and creates 1 database record. After the end of each iteration I am calling flush to (try) and force the record to be written out to Oracle, and not just stored in JBoss? cache.
While the above loop is running, the server I sent the HTTP POST to in the loop above starts connecting to a JSP page I have created to say that it completed the work I sent it. The JSP page uses another stateless session bean, which looks up the database record created in the loop by its primary key and attempts to update it. The problem I am having occurs here. If the method with the loop above is still running, the database record is not found.
So JBoss is not storing the record in Oracle until the method completes, even though I am calling flush. And since my lookup for the record is based on its primary key, JBoss doesn?t check its cache but goes directly to the database (according to the docs I read anyway).
I am using JBoss 4.0.4. Does anyone have any tips or ideas as to how I can overcome this? Thanks!
DaHunter
View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4063504#4063504
Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4063504
19Â years
[Messaging, JMS & JBossMQ] - Re: No ClassLoaders found for: ClassLoading problem in JMS M
by avis1977
Thats correct... we are infact using the defineClass()
Is there a way still to make this class available to the RepositotyClass loader.
By the way the classLoader instance that I get at the point of time when I generate my code is an instance of the GenericClassLoader.
Are there any other alternatives cos all we have is bytes[] of the class file at the time when we load these classes in memory.
Earlier my code called defineClass on the currentClass.class.getClassLoader()
I have changed the implementation to use the Thread.currentThread().getContextClassLoader().
No luck here... I get the NoClassLoaders found for error in the first Try Catch.
Here is how the code looks like now
private Class createClass(ClassWriter writer, String className,
String baseClassName) throws Exception {
Class clazz = null;
String qualifiedClassName = className.replaceAll("/", ".");
try {
clazz = Thread.currentThread().getContextClassLoader().loadClass(
qualifiedClassName);
} catch (Exception e) {
Class c = Class.forName("java.lang.ClassLoader");
Class[] args = new Class[] { String.class, byte[].class, int.class,
int.class };
java.lang.reflect.Method method = c.getDeclaredMethod(
"defineClass", args);
Object[] params = new Object[] { qualifiedClassName,
writer.toByteArray(), new Integer(0),
new Integer(writer.toByteArray().length) };
ClassLoader loader = Thread.currentThread().getContextClassLoader();
method.setAccessible(true);
clazz = (Class) method.invoke(loader, params);
method = c.getDeclaredMethod("resolveClass",
new Class[] { Class.class });
method.setAccessible(true);
method.invoke(loader, new Object[] { clazz });
}
return clazz;
}
View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4063498#4063498
Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4063498
19Â years