https://issues.apache.org/bugzilla/show_bug.cgi?id=52326
Bug #: 52326
Summary: Lower log level for failed class loading
Product: Tomcat 7
Version: 7.0.23
Platform: PC
Status: NEW
Severity: minor
Priority: P2
Component: Catalina
AssignedTo: dev@tomcat.apache.org
ReportedBy: fha...@apache.org
Classification: Unclassified
Reference: https://jira.springsource.org/browse/SPR-8894
Tomcat attempts to load classes when it searches for annotations. These class
loading attempts when failed, should be silently ignored.
If the application attempts to load the classes later, it will receive the
actual error. However, when Tomcat prints out the stack trace of this class
loading error, it gives the wrong signal. There is actually not anything wrong
in the application itself, so a WARN as tomcat logs with a stack trace becomes
misleading.
The initial fix would be: ContextConfig.java to drop log level to debug in
checkHandleTypes method
Class<?> clazz = null;
try {
clazz = context.getLoader().getClassLoader().loadClass(className);
} catch (NoClassDefFoundError e) {
log.debug(sm.getString("contextConfig.invalidSciHandlesTypes",
className), e);
return;
} catch (ClassNotFoundException e) {
log.warn(sm.getString("contextConfig.invalidSciHandlesTypes",
className), e);
return;
} catch (ClassFormatError e) {
log.warn(sm.getString("contextConfig.invalidSciHandlesTypes",
className), e);
return;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.warn(sm.getString("contextConfig.invalidSciHandlesTypes",
className), t);
return;
}
The better fix would be to achieve the same without classloading at all.
Other containers do ignore any type of classloading errors during this
sequence.
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