[jboss-jira] [JBoss JIRA] (WFLY-11116) Wildfly 12.0.0 Final Delay in Getting the Value Attributes of the Session Variables (Result in Null Pointer Exception)
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https://issues.jboss.org/browse/WFLY-11116?page=com.atlassian.jira.plugin...
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Paul Ferraro commented on WFLY-11116:
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Using the default configuration, any changes to the HttpSession made during the a given
request will be committed after the response is flushed. So, in your example, these
changes will not be visible to other threads until the commit is complete. This is where
REPEATABLE_READ isolation is important. Any request for that same HttpSession will block
until the previous commit completes.
Relaxing the isolation to READ_COMMITTED, would allow other threads to read the session
before that commit completes, but these read wold be dirty.
Alternatively, you can disable cache transactions altogether, in which case, every write
to the session will execute in a separate transaction. This allows multiple threads to
read and write to the session concurrently, using last write wins semantics. It sounds
like this better fits your application's expectations.
Wildfly 12.0.0 Final Delay in Getting the Value Attributes of the
Session Variables (Result in Null Pointer Exception)
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Key: WFLY-11116
URL: https://issues.jboss.org/browse/WFLY-11116
Project: WildFly
Issue Type: Bug
Components: Clustering
Affects Versions: 14.0.1.Final, 12.0.0.Final, 13.0.0.Final, 15.0.0.Final
Reporter: ziad saade
Assignee: Paul Ferraro
Priority: Critical
I have two Servlets Book and BookPreview the attribute is set in Book Servlet as follow:
Book.java
TestBean testBean=null;
if(session.getAttribute("testBean")!=null)
testBean = (TestBean)session.getAttribute("testBean");
else{
testBean=new TestBean();
session.setAttribute("testBean",testBean);
}
testBean.setAmount("10");
response.sendRedirect("BookPreview");
The session attribute can be retrieved and the page is loaded normally and the Amount
value is displayed however when submitting the form (Post Action in BookPreview.java) Null
Pointer exception is generated.
BookPreview.java
TestBean testBean = (TestBean)session.getAttribute("testBean");
String amount = testBean.getAmount; //Null pointer exception when submitting the form
<form method="Post" action="BookPreview">
</form>
TestBean.java
public class TestBean implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private String amount;
public String getAmount() {
return amount;
}
public void setAmount(String amount) {
this.amount = amount;
}
}
Kindly advice how to fix the problem at the level of the server configuration.
PS: I am not getting the exception when deploying the same application under other J EE
application servers (Tomcat....)
Thanks and Best Regards
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