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Servlet Version Conflict [message #222686]

Fri, 17 October 2008 03:59

Eclipse User

Hello friends,
I am new to J2EE. I was doing some homework and got one error.
I think know why this error is coming but i don't know how to remove it.
If anybody could help me!
I am using Eclipse Ganymede. The compiler compliance level is
1.6. Installed jre is jre1.6.0_01. I have J2ee5(with Sun Application
Server PE9) installed. When i created new Dynamic Web Project and added a
servlet there were some errors telling that 'HttpServlet' class couldn't
found. So I added 'javax.servlet_2.4.0.v200806031604' jar's reference to
my project(in the Build Path) and errors were gone.
After that I exported my dynamic project into .war file and
deployed it using Sun Application Server PE9. Everything worked fine. I
launched my application and requested the specific servlet and i got
following error: javax.servlet.ServletException: Error allocating a
servlet instance. java.lang.UnsupportedClassVersionError: Bad version
number in .class file.
I thought it's due to the compliance level and installed jre
version which is conflicting with the J2EE5. So I changed the installed
jre and compliance level to inbuilt jre which comes with J2EE. But still i
am getting the same error.

Re: Servlet Version Conflict [message #222694 is a reply to message #222686]

Fri, 17 October 2008 09:00

Eclipse User

The problem is that your servlet classes are build with JDK 1.6 using
compliance level 1.6, but your application server is running with JDK 1.5.
The easiest way to solve this problem is to right-click your Web project
then choose Properties > Project Facets and modify the version of the Java
facet: choose a lower level - 5.0 or 1.4. After you click OK, your project
will be rebuilt and it should deploy and run without problems.

Greetings,
Kaloyan

"vallabh vaidya" <vallabh_vaidya@yahoo.co.in> wrote in message
news:a70014298f60f2f498e603d5f4143e3d$1@www.eclipse.org...
> Hello friends,
> I am new to J2EE. I was doing some homework and got one error.
> I think know why this error is coming but i don't know how to remove it.
> If anybody could help me!
> I am using Eclipse Ganymede. The compiler compliance level is
> 1.6. Installed jre is jre1.6.0_01. I have J2ee5(with Sun Application
> Server PE9) installed. When i created new Dynamic Web Project and added a
> servlet there were some errors telling that 'HttpServlet' class couldn't
> found. So I added 'javax.servlet_2.4.0.v200806031604' jar's reference to
> my project(in the Build Path) and errors were gone.
> After that I exported my dynamic project into .war file and
> deployed it using Sun Application Server PE9. Everything worked fine. I
> launched my application and requested the specific servlet and i got
> following error: javax.servlet.ServletException: Error allocating a
> servlet instance. java.lang.UnsupportedClassVersionError: Bad version
> number in .class file.
> I thought it's due to the compliance level and installed jre
> version which is conflicting with the J2EE5. So I changed the installed
> jre and compliance level to inbuilt jre which comes with J2EE. But still i
> am getting the same error.
>
>
>
>

Re: Servlet Version Conflict [message #222705 is a reply to message #222694]

Sat, 18 October 2008 00:55

Eclipse User

Thanks Kaloyan,
As u told I changed the Project Facets to 5 and now
everything is working fine. Thank you very much for your quick reply.

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