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Posted to dev@tomcat.apache.org by bu...@apache.org on 2014/03/10 19:03:32 UTC
[Bug 56242] New: Deploying a Velocity-based web application can
thwart Attach API connections for monitoring
https://issues.apache.org/bugzilla/show_bug.cgi?id=56242
Bug ID: 56242
Summary: Deploying a Velocity-based web application can thwart
Attach API connections for monitoring
Product: Tomcat 8
Version: trunk
Hardware: PC
OS: Mac OS X 10.4
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: chris@christopherschultz.net
This may not be a Tomcat bug, but I think it best to report it here as it's
more likely the Tomcat team will be able to find the root cause.
The attached web application WAR does nothing other than define a <servlet>
that comes out of the box with Velocity and Velocity Tools. The mere presence
of this servlet appears to cause the JVM to reject certain Attach API
connections -- such as those from jconsole, VisualVM, and other profiling
tools.
VisualVM will connect after an error ("attach: task_for_pid(23490) failed (5)"
in the console, longer stack trace available which basically says "couldn't
connect") but the JMX tab will be unavailable.
Any help with discovering the root cause of this issue would be greatly
appreciated.
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[Bug 56242] Deploying a Velocity-based web application can thwart
Attach API connections for monitoring
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56242
--- Comment #1 from Christopher Schultz <ch...@christopherschultz.net> ---
Created attachment 31379
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31379&action=edit
Minimal web application WAR that reproduces the problem.
I had to remove the following files to reduce the size enough to attach to the
BZ issue. They should be trivially-retrievable from ASF's web site(s):
deleting: WEB-INF/lib/commons-beanutils-1.8.3.jar
deleting: WEB-INF/lib/commons-collections-3.2.1.jar
deleting: WEB-INF/lib/commons-digester-1.8.jar
deleting: WEB-INF/lib/commons-lang-2.4.jar
deleting: WEB-INF/lib/commons-logging-1.1.1.jar
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[Bug 56242] Deploying a Velocity-based web application can thwart
Attach API connections for monitoring
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56242
Mark Thomas <ma...@apache.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
OS| |All
--- Comment #3 from Mark Thomas <ma...@apache.org> ---
If you start Tomcat with -Xverify:none (not something I'd recommend doing) the
problem goes away. This looks like a VisualVM bug that is triggered by one of
the velocity classes.
As an alternative, attach VisualVM and then deploy the Velocity app.
For those wondering how I stumbled across the solution:
1. Google "attach: task_for_pid(23490) failed (5)"
2. Read through the VisualVm bug reports that finds
3. Specifically read this one: https://java.net/jira/browse/VISUALVM-326
4. Experiment with the settings suggested in that report to see which are
actually required
I'd recommend opening a VisalVM bug for this.
I concur that this is a Mac specific error.
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[Bug 56242] Deploying a Velocity-based web application can thwart
Attach API connections for monitoring
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56242
--- Comment #4 from Christopher Schultz <ch...@christopherschultz.net> ---
I'll give -x:verify:none a try (on the client?) but this also happens with both
jconsole and YourKit. Might this be an underlying JVM bug? I didn't try with
other versions (e.g. OpenJDK, IBM, or Sun/Oracle Java 6) yet.
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[Bug 56242] Deploying a Velocity-based web application can thwart
Attach API connections for monitoring
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56242
Christopher Schultz <ch...@christopherschultz.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
OS|Mac OS X 10.4 |Mac OS X 10.9
--- Comment #2 from Christopher Schultz <ch...@christopherschultz.net> ---
Might me Mac/JVM specific. Konstantin was unable to reproduce on Windows.
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