https://bz.apache.org/bugzilla/show_bug.cgi?id=57875
Bug ID: 57875
Summary: Classloading guide on Servlet API classes
Product: Tomcat 8
Version: 8.0.21
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Documentation
Assignee: dev@tomcat.apache.org
Reporter: psf...@clustertech.com
https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
The guide writes
Any JAR file that contains Servlet API classes will be explicitly ignored by
the classloader — Do not include such JARs in your web application.
I try including javaee-api-7.0.jar in my webapp in Tomcat 8. It contains
Servlet API classes as well as other JEE API such as JPA and JTA. My webapp
which depends on JPA and JTA runs normally, which implies the classes from
javaee-api-7.0.jar are loaded.
When the same webapp is deployed in Tomcat 7, the following error is shown and
my webapp failed to deploy because of NoClassDefFoundError of some JPA/JTA
class.
INFO:
validateJarFile(C:\apache-tomcat-7.0.54\webapps\ROOT\WEB-INF\lib\javaee-api-7.0.jar)
- jar not loaded.
See Servlet Spec 3.0, section 10.7.2. Offending class:
javax/servlet/Servlet.class
It appears that the classloader is changed in Tomcat 8 and that restriction is
lifted. If so, please update the guide accordingly.
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