-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Mark,
On 8/10/12 5:06 AM, Mark Thomas wrote: > On 10/08/2012 04:57, Dale Ogilvie wrote: >> -----Original Message----- From: Mark Thomas >> [mailto:ma...@apache.org] Sent: Thursday, 9 August 2012 8:22 >> p.m. To: Tomcat Users List Subject: RE: ClassCastException >> org.apache.jasper.runtime.ELContextImpl cannot be cast to >> org.apache.jasper.el.ELContextImpl >> >>>> Dale Ogilvie <dale_ogil...@trimble.com> wrote: >>>> >>>> ClassCastException org.apache.jasper.runtime.ELContextImpl >>>> cannot be cast to org.apache.jasper.el.ELContextImpl >>>> >>>> That says to me that app1 already has an instance of >>>> org.apache.jasper.runtime.ELContextImpl which it is trying to >>>> cast to the tomcat version. So your statement that "Tomcat >>>> prevents a class loaded in app2 from being visible in app1" >>>> seems to be false. >> >>> Does that cast succeed? No. Why? Because the class isn't >>> visible to app1. >> >> Thanks again for your explanations here Mark. Apologies if you >> thought I was calling your credentials into question. Nothing of >> any sort entered into my mind. >> >> Trying not to be annoying, just to gain clarity. I'll rephrase >> your comment above for clarity of what I believe you are saying. >> >> "Does that cast of the org.apache.jasper.runtime.ELContextImpl >> instance succeed? No. Why? Because the >> org.apache.jasper.runtime.ELContextImpl class isn't visible to >> app1." >> >> If app1 has an instance of >> org.apache.jasper.runtime.ELContextImpl (provided by app2) whose >> class it knows nothing about, shouldn't the exception be: >> >> ClassNotFoundException org.apache.jasper.runtime.ELContextImpl >> >> NOT >> >> ClassCastException org.apache.jasper.runtime.ELContextImpl cannot >> be cast to org.apache.jasper.el.ELContextImpl >> >> The latter error does not tell me that the class >> org.apache.jasper.runtime.ELContextImpl isn't visible to app1. > > It will depend exactly what is going on but since it is a cast > that fails, ClassCastException doesn't seem to be unreasonable. > There may be a root cause that provides more detail. The full > exception should be in the logs. Actually, I would have expected the ClassCastException because the JVM is not trying to load a class at this point: the Class was loaded long before through some unrelated mechanism. When this failure occurs, the Class has been loaded and an object has already been created: the JVM is just checking a cast which (of course) fails. Dave, if this is reproducable, you ought to be able to catch it with a debugger and go and look at all the interesting details such as which ClassLoader loaded which class, what the exact type (Class + ClassLoader) of the object in question is, and exactly what type (Class + ClassLoader) is being used for the cast. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlAlHVcACgkQ9CaO5/Lv0PDdCQCgh08W+lt8fppRiEpahGXF1pRY MAsAn2YpMDkFjJ4Ll/EKiOuOEoaz2UEK =eQxK -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
