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From "Pid *" <...@pidster.com>
Subject Re: JasperException: The value for the useBean class ___ attribute is invalid
Date Thu, 19 Apr 2012 07:25:56 GMT
On 19 Apr 2012, at 01:12, Konstantin Kolinko <knst.kolinko@gmail.com> wrote:

> 2012/4/19 Chris Patterson <tomcat@vittox.com>:
>> Dear Konstantin, thanks for asking, I will try to answer your questions
>>
>> My experience level is relative, idea is to spend less time sharing your
>> experience.
>> I have installed Tomcat servers for many years mostly on Unix/Linux,
>> and allready have a CentOS 5.6 with Tomcat 6.x (default) on  a local server.
>>
>
> OK. Thank you for detailed answer. It makes more sense now.
>
>> I could deploy my "Dynamic Web Application" (eclipse language) named Test-03
>> from a
>> WAR format and it worked for both cases. _So it should not be the "code"._
>> Of course it is not a Web App, its only a Test.
>>
>> Differences are:
>> Local host has Tomcat 6.x, VPS server has Tomcat 5.3.35
>> Local host has Java 1.6.0_22 / OpenJDK 64-Bit, VPS server has Java 1.6.0_29
>> / Java Hotspot 64-Bit
>>
>> I checked following files having basically the same default configuration:
>> server.xml, web.xml, context.xml
>>
>> When deployed on the /local server/ using the Tomcat Manager
>> I see the following directories:
>>
>>  docs
>>  examples
>>  host-manager
>>  manager
>>  ROOT
>>  sample
>>  Test-03
>>  Test-03.war
>>
>> Under ROOT is working the Test with URLs:
>>  localhost:8080/prg1.jsp
>>  localhost:8080/subdir/prg2.jsp

If you have deployed the broken config you originally posted then
there is a good chance that subdir is being treated as a web
application and Jasper is looking for the class in a non-existent
WEB-INF/lib.


p




>> Also work fine under Test-03
>>    localhost:8080/Test-03/prg1.jsp
>>    localhost:8080/Test-03/subdir/prg2.jsp
>>
>> The class files are respectively under ROOT/WEB-INF/classes and
>> Test-02/WEB-INF/classes
>> I just copied all content undet Test-03 to the ROOT folder and reloaded
>> (using the Manager)
>>
>
> There are two apparent differences with the above copy+reload
> procedure, as compared with "clean" deploy:
>
> 1. Reload != (Start + Stop).
>
> It is a more lightweight operation than stopping and then starting a
> webapp. Maybe something went wrong there.
>
>
> 2. You have not cleared the work directory of the ROOT webapp.
>
> So there might be previous compiled classes for those JSPs. Depending
> on timestamps they will be not recompiled.  (E.g. if you replace a jsp
> with an older copy of that jsp, it will not be recompiled. Check
> whether the clock on the server has the correct time. Thought it is
> easier to just clean the work directory for the webapp.)
>
>
> The resource id for that "The value for the useBean class" message is
> "jsp.error.invalid.bean".
>
> It is thrown is in jasper.compiler.Generator#visit() when it visits
> <jsp:useBean> node if it cannot load the class specified in the
> useBean tag.
>
> http://svn.apache.org/viewvc/tomcat/tc5.5.x/tags/TOMCAT_5_5_35/jasper/src/share/org/apache/jasper/compiler/Generator.java?view=markup#l1199
>
>
> You have to check that you did not forget to copy necessary supporting
> classes and libraries. If that fails, try to write a simple jsp that
> explicitly loads that class.
>
>> The same excersise on the VPS running CPanel for a domain like etrust.us
>> does only work for etrust.us/Test-03/prg1.jsp
>> When trying etrust.us/prg1.jsp it only works until trying
>> etrust.us/subdir/prg2.jsp,
>> then i get the error 500: JasperException: The value for the useBean class
>> ___ attribute is invalid
>>
>> Log file shows no more details about the issue.
>>
>> As "main directory" I mean the docBase referenced in the server.xml file.
>> I have read the Servlet Specificacion (2.4) and did several changes to the
>> configuration files with no success.
>>
>> Does someone here have any idea where to check some configuration ?
>>
>>
>> El 18/04/2012 12:08 p.m., Konstantin Kolinko escribió:
>>>
>>> 2012/4/18 Chris Patterson<tomcat@vittox.com>:
>>>>
>>>> More on this, now I think it is some configuration issue for the tomcat
>>>> server:
>>>>
>>>> I am using eclipse to check both JSP files, and they work without any
>>>> problems
>>>> in my PC. When deploying to Tomcat 5.5.35 to a sub-directory like de
>>>> project
>>>> name
>>>> they also work fine. For example at www.domain.com/Test1/prg1.jsp and
>>>> www.domain.com/Test1/subdir/prg2.jsp.
>>>>
>>>> If I copy them to the main directory with a shell command:
>>>> cp -pr * .. from the Test1 directory and undeploy the Test1 application
>>>> then only www.domain.com/prg1.jsp works and but the second one,
>>>> www.domain.com/subdir/prg2.jsp gives me the same (500) error:
>>>>
>>>> /prg2.jsp(26,0) The value for the useBean class attribute
>>>> jdbcbean.Stringbean is invalid.
>>>>
>>>>
>>>> Is this like a BUG ? Or perhaps something about the Java version ?
>>>> I have the following version running on a CentOS release 5.8:
>>>> java version "1.6.0_29"
>>>> Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
>>>> Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02, mixed mode)
>>>>
>>>> Hope this info help a little more to find a solution.
>>>>
>>>>
>>> What is your experience level?
>>>
>>> Do you know what a "web application" is?
>>> Have you read The Servlet specification, Documentation, etc.?
>>>
>>> Do you know where your classes must be put in a Web application?
>>>
>>> Your "main directory" terminology does not make sense.
>>>
>
> Best regards,
> Konstantin Kolinko
>
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