java.lang.IllegalArgumentException: java.lang.ClassCastException@da7659

[Alex Black]

Hi, I'm grasping at straws here, but today and yesterday our Lift app
started throwing exceptions on most pages of our site, a simple
restart of jetty would resolve it, this happened 4 times within 48
hours, and we haven't seen anything like this over the last 9 months.

- Once the exception starts happening, it happens every time on most
pages on the site, the web server returns a 500 error
- Jetty logs a stack trace for each error
- I've got a stack trace snippet below, and the next line that I've
trimmed is in our code, and its the SAME line every time, the line is
pointing to a value in a list initialization, e.g. our method looks
like this:

class Foo {
def getList: List[Bar] = {
List(
A,
B,
C,
D
)
}
}

and the line of code is one of the items in the list, say B in this
example.

Stack trace snippet:

2010-09-10 13:04:20,659 [32389375@qtp-22743805-199] ERROR lift -
Exception being returned to browser when processing Req(List(), Map(),
ParsePath(List(comparison),,true,false), , GetRequest, Empty)
java.lang.IllegalArgumentException:
java.lang.ClassCastException@da7659
at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:597)

Any ideas?
- how do I interpret the error? Is it saying a ClassCast exception
occurred and that caused an IllegalArgument exception? and perhaps
we've lost the details on the original ClassCast exception?
- does this look familiar to anyone?
- I've found people with similar stack traces on the net, with no
resoultion in site, e.g. http://hi.baidu.com/aiqi13/blog/item/22b854092a6ebfa52eddd4de.html

thx

- Alex

[David Pollak]

Alex,

If you don't mind going private (off list), I'll be happy to look at your source code and your configuration and see if anything looks out of whack.

I have seen issues where the temporary directory that jetty puts its stuff in (which is in /tmp) will get house-cleaned and cause apps to behave unexpectedly.  But this is looking to me like a class loader issue.

Anyway, I'll be glad to help out as I can to discover the root cause of the issue and help you address it.

Thanks,

David

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[Christoph Henkelmann]

Hi,

I don't know if this also applies to Jetty, but we had similar issues with
tomcat once when classes where loaded twice by different classloaders in
tomcat because jars where in the lib directory of the webapp and the global
lib directory of tomcat.

Even if they are the same class, being loaded by different classloaders made
them incompatible, so we had a class cast exception (if I remember correctly)

Removing duplicate jar files resolved the issue in our case.

-Chris

[Alex Black]

Hi David, thanks for the generous offer, that sounds great. Lets talk
Monday.

On Sep 11, 7:53 pm, David Pollak <feeder.of.the.be...@gmail.com>
wrote:

> > liftweb+u...@googlegroups.com<liftweb%2Bunsu...@googlegroups.com >
> > .

> > For more options, visit this group at
> >http://groups.google.com/group/liftweb?hl=en.
>
> --
> Lift, the simply functional web frameworkhttp://liftweb.net

> Beginning Scalahttp://www.apress.com/book/view/1430219890

[Alex Black]

Thanks Chris, we'll look around for duplicate JAR files, what you
describe does seem to line up with the symptoms. It does seem like
Jetty is loading a new class (or classes), but I'm not yet sure what
is triggering/causing that.

On Sep 12, 5:01 am, Christoph Henkelmann <blog...@henkelmann.eu>
wrote:

[Karl Ivar Dahl]

Hi Alex, did you find the reason for this error?

Please share for the benefit of the Googling late-comers :)

I'm looking at the exact same thing in my Tomcat logs.

Thanks,

Karl Ivar

[Alex Black]

Hi Karl, I'm afraid I don't remember at this point.

I did a few searches through my email and from what I can tell the issue went away.  Internally our only theory at the time was that we had a misconfiguration in our deployment servers that was deploying when we weren't expecting  and possibly deploying from some other branch.

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[Diego Medina]

Maybe starting a new thread will let us help you better.

Some questions that come to mind:

1- did you check if you have duplicate jars in your war file?

2- Is this something that started happening all of the sudden, with no code change from your side?

3- did you upgrade scala and or lift before this started happening?

Thanks

  Diego

On Wed, Aug 14, 2013 at 3:39 AM, Karl Ivar Dahl <kid...@gmail.com> wrote:

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http://fmpwizard.telegr.am