DO NOT REPLY [Bug 16577] - WebappClassLoader delegates to parent loader
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16577
WebappClassLoader delegates to parent loader
[EMAIL PROTECTED] changed:
What|Removed |Added
Status|RESOLVED|REOPENED
Resolution|WONTFIX |
--- Additional Comments From [EMAIL PROTECTED] 2003-01-30 18:34 ---
Remy,
Even if this behavior is not *required* by the specification it is still a
good idea to be backward compatible with previous Tomcat releases (IMHO).
The reason why this matters to us (the company I work for), is that some of
our code is designed to work with particular versions/implementations of
libraries.
I think I see how this can be fixed:
Note the private field defined on line 192 of the source...
/**
* Set of package names which are not allowed to be loaded from a webapp
* class loader without delegating first.
*/
private static final String[] packageTriggers = {
javax, // Java extensions
org.xml.sax, // SAX 1 2
org.w3c.dom, // DOM 1 2
org.apache.xerces, // Xerces 1 2
org.apache.xalan // Xalan
};
The loading classes from packages starting with the above names is
delegated to the parent loader. This behavior is not backward compatible
with previous class loading behavior. In particular, this makes the use
of another XML library not possible within a given app context. (Yes, there
are other problems when running against the 1.4 version of the JDK with the
XML libraries, but that is another matter.)
I'm not sure why it is here in the first place, but the simple solution
is to empty this private string array field.
Regards,
-Babak
-
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DO NOT REPLY [Bug 16577] - WebappClassLoader delegates to parent loader
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG RELATED COMMENTS THROUGH THE WEB INTERFACE AVAILABLE AT http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16577. ANY REPLY MADE TO THIS MESSAGE WILL NOT BE COLLECTED AND INSERTED IN THE BUG DATABASE. http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16577 WebappClassLoader delegates to parent loader [EMAIL PROTECTED] changed: What|Removed |Added Status|REOPENED|RESOLVED Resolution||WONTFIX --- Additional Comments From [EMAIL PROTECTED] 2003-01-30 18:41 --- This is not a feature which is open for discussion, actually. javax.* will be treated as delegate first, to get around the Sun policy of bundling random extensions in J2SE (and the spec *does* require delegation for the J2SE classes). This solution is by far the lesser of many CL evils introduced in JDK 1.4. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
DO NOT REPLY [Bug 16577] - WebappClassLoader delegates to parent loader
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG RELATED COMMENTS THROUGH THE WEB INTERFACE AVAILABLE AT http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16577. ANY REPLY MADE TO THIS MESSAGE WILL NOT BE COLLECTED AND INSERTED IN THE BUG DATABASE. http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16577 WebappClassLoader delegates to parent loader --- Additional Comments From [EMAIL PROTECTED] 2003-01-30 19:14 --- Okay, thanks for clearing that up (the part about not being open for discussion). In light of your decision you might want to tell the documentation folks that information in http://jakarta.apache.org/tomcat/tomcat-4.1-doc/class-loader-howto.html is outdated and incorrect (the part about how libraries are loaded) in each context. I think I've done my part. Ciao, -b. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
DO NOT REPLY [Bug 16577] - WebappClassLoader delegates to parent loader
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG RELATED COMMENTS THROUGH THE WEB INTERFACE AVAILABLE AT http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16577. ANY REPLY MADE TO THIS MESSAGE WILL NOT BE COLLECTED AND INSERTED IN THE BUG DATABASE. http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16577 WebappClassLoader delegates to parent loader [EMAIL PROTECTED] changed: What|Removed |Added Status|NEW |RESOLVED Resolution||WONTFIX --- Additional Comments From [EMAIL PROTECTED] 2003-01-30 07:04 --- The behavior mentioned in the specification is only a recommendation. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
