[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #11 from Konstantin Kolinko  ---
(In reply to Konstantin Kolinko from comment #4)
> It sounds like a duplicate of bug 57823.
> 
> 
> By the way, regarding
> org.apache.catalina.startup.ContextConfig.processAnnotationsFile()
> method:
> 
> 1. This method needs debug logging. (There is none at the moment).
> 2. The following condition needs first && second swapped:
> 
> >> } else if (file.canRead() && file.getName().endsWith(".class")) {
> 
> As can be seen from stacktrace in Comment 0, the "canRead()" call is an I/O
> operation. This is more expensive than a filename check.
> 

The above improvements were implemented and will be in 7.0.68, 8.0.31, 9.0.0.M2
onwards.
(r1725165/r1725167/r1725170)

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #9 from nitsan_dan...@bmc.com ---
We've found the our classpath starts with a colon (for instance,
:/a.jar:/b.jar), after removing the leading colon Tomcat didn't scan [file:/]
and the problem was resolved.

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #10 from nitsan_dan...@bmc.com ---
Thank you guys for your help!

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #8 from Konstantin Kolinko  ---
(In reply to nitsan_daniel from comment #7)
My guess:

Either classpath is different between starts,

or the current working directory is different between starts (as misconfigured
classpath includes the current working directory),

or some other reason (different file tree, e.g. some remote drives not mounted
at boot time).

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #7 from nitsan_dan...@bmc.com ---
How can this be the problem if it's working on the first start but fails
starting from the second start and beyond.
The classpath is the same all the time.
If this was indeed the problem I would expect it to hang during the first start
as well.

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #4 from Konstantin Kolinko  ---
It sounds like a duplicate of bug 57823.


By the way, regarding
org.apache.catalina.startup.ContextConfig.processAnnotationsFile()
method:

1. This method needs debug logging. (There is none at the moment).
2. The following condition needs first && second swapped:

>> } else if (file.canRead() && file.getName().endsWith(".class")) {

As can be seen from stacktrace in Comment 0, the "canRead()" call is an I/O
operation. This is more expensive than a filename check.


> java.lang.Thread.State: RUNNABLE
>   at java.io.UnixFileSystem.checkAccess(UnixFileSystem.java:-1)
>   at java.io.File.canRead(File.java:768)
>   at 
> org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:1992)
>   at 
> org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:1988)
>   at 
> org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:1988)
>   

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

Konstantin Kolinko  changed:

   What|Removed |Added

 Resolution|INVALID |DUPLICATE

--- Comment #6 from Konstantin Kolinko  ---
(In reply to nitsan_daniel from comment #5)
> Created attachment 33377 [details]
> Debug logs

In tomcat.log.2:

Dec-27-2015 12:18:24 GMT DEBUG [org.apache.tomcat.util.scan.StandardJarScanner]
[localhost-startStop-1] [DEBUG] - Scanning JAR [/WEB-INF/lib/perf4j-0.9.16.jar]
from /WEB-INF/lib

Dec-27-2015 12:18:24 GMT DEBUG [org.apache.tomcat.util.scan.StandardJarScanner]
[localhost-startStop-1] [DEBUG] - Scanning JAR
[file:/opt/bmc/App_Visibility/portal/webapps/portal-console/WEB-INF/classes/]
from classpath

Dec-27-2015 12:18:24 GMT DEBUG [org.apache.tomcat.util.scan.StandardJarScanner]
[localhost-startStop-1] [DEBUG] - Scanning JAR [file:/] from classpath

Dec-27-2015 12:18:24 GMT DEBUG [org.apache.tomcat.util.scan.StandardJarScanner]
[localhost-startStop-1] [DEBUG] - Scanning JAR
[file:/opt/bmc/App_Visibility/common/lib/quartz-all-2.1.1.jar] from classpath

There is no hanging here (and I see no hanging in these debug logs), but
"file:/" is certainly in class path.

Thus it is a duplicate of bug 57823

*** This bug has been marked as a duplicate of bug 57823 ***

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #5 from nitsan_dan...@bmc.com ---
Created attachment 33377
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=33377=edit
Debug logs

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

Mark Thomas  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |INVALID

--- Comment #1 from Mark Thomas  ---
There is no evidence of a Tomcat bug in this report.

Please use the users mailing list to debug the problem you are seeing. If the
conclusion from that is that there is a bug here then this issue can be
re-opened and the necessary detail added.

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #2 from Konstantin Kolinko  ---
Read about annotation scanning in this FAQ article:
https://wiki.apache.org/tomcat/HowTo/FasterStartUp

I agree with Mark that there is not enough evidence here.

Annotation scanning is expected to take notable time, -- as explained in the
above FAQ entry.

Comments:

1) If you can turn on debug logging and are able to provide an evidence that
Tomcat performs the same work over and over, e.g. scans the same set of
classes, this would be a valid issue.

Tomcat uses standard java.util.logging API as provided by Java Runtime. The
Oracle JDK documentation describes how configure it. This configuration is
available for standalone applications as well.

2) A single thread dump does not say whether things change over time. The usual
advice is to take several (3) dumps over time.

https://wiki.apache.org/tomcat/FAQ/Troubleshooting_and_Diagnostics#Common_Troubleshooting_Scenario

3) Current version of Tomcat 8 is 8.0.30.

4) If you need help, ask on the Tomcat users' mailing list,
https://wiki.apache.org/tomcat/FAQ/Tomcat_User

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[Bug 58766] Embedded Tomcat 8 startup hangs on RedHat when calling addWebapp

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=58766

--- Comment #3 from nitsan_dan...@bmc.com ---
The problem is not about Tomcat loading slowly.
It is just stuck.

We've committed several thread dumps, all show the same problem.
Moreover, we've waiting for hours - tomcat won't return from this same method.

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