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Posted to users@tomcat.apache.org by Désilets,
Alain <Al...@nrc-cnrc.gc.ca> on 2018/07/16 11:45:01 UTC
Can't start Tomcat in debug mode
I am unable to start Tomcat in debug mode. I have searched and see that lots of people are having similar issues. I tried all the fixes that were proposed and none of them seem to work.
Here is what I have at the moment.
I have a file /Library/Tomcat/bin/setenv with the following content
# Trying to start Tomcat in debug mode...
#
# CATALINA_OPTS="-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"
JPDA_ADDRESS=8000
JPDA_TRANSPORT=dtsocket
JPDA_SUSPEND=n
Note that I tried setting the JPDA environment both ways (using CATALINA_OPTS and JPDA_* vars) and the result is the same.
To restart tomcat, I do the following command:
echo "" > /Library/Tomcat/logs/catalina.out ; /Library/Tomcat/bin/shutdown.sh; sleep 2; /Library/Tomcat/bin/catalina.sh jpda start; echo "Restarted tomcat, catalina.out is:"; cat /Library/Tomcat/logs/catalina.out
This produces the following output:
Using CATALINA_BASE: /Library/Tomcat
Using CATALINA_HOME: /Library/Tomcat
Using CATALINA_TMPDIR: /Library/Tomcat/temp
Using JRE_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home
Using CLASSPATH: /Library/Tomcat/bin/bootstrap.jar:/Library/Tomcat/bin/tomcat-juli.jar
Using CATALINA_BASE: /Library/Tomcat
Using CATALINA_HOME: /Library/Tomcat
Using CATALINA_TMPDIR: /Library/Tomcat/temp
Using JRE_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home
Using CLASSPATH: /Library/Tomcat/bin/bootstrap.jar:/Library/Tomcat/bin/tomcat-juli.jar
Tomcat started.
Restarted tomcat, catalina.out is:
16-Jul-2018 07:35:12.366 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
16-Jul-2018 07:35:12.366 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-8080"]
16-Jul-2018 07:35:12.426 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-8009"]
16-Jul-2018 07:35:12.483 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
16-Jul-2018 07:35:12.517 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-8080"]
16-Jul-2018 07:35:12.520 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-8009"]
16-Jul-2018 07:35:12.523 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-8080"]
16-Jul-2018 07:35:12.523 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-8009"]
When I go to http://localhost:8000, I get “This site can’t be reached”.
Same if I go to http://localhost:8080/.
But… if I restart tomcat using the same command as above, except without the ‘jpda’ argument to Catalina.sh, then 8080 is started fine, but not 8000 (which Is to be expected).
I checked to see if port 8000 is already busy by issueing this command:
sudo lsof -iTCP -sTCP:LISTEN -n -P | grep 8000
But is shows no process listening on that port. And I know that this command works because when I successfully start tomcat without ‘jpda’, if I use this command to check for port 8080, I get:
java 1925 desilets 60u IPv6 0xad510ad8630ef821 0t0 TCP *:8080 (LISTEN)
Not sure what to try next… have pretty much run out of options at this point.
Any help will be greatly appreciated.
Thx.
Alain Désilets
National Research Council of Canad
Re: Can't start Tomcat in debug mode
Posted by Désilets,
Alain <Al...@nrc-cnrc.gc.ca>.
On 2018-07-16, 9:28 AM, "Konstantin Kolinko" <kn...@gmail.com> wrote:
> >> ps: a HTTP request against the debug port will print this message in the
> >> catalina.out Debugger failed to attach: handshake failed - received >GET /
> >> HTTP/1.1< - expected >JDWP-Handshake<
> >
> > Yep, I get that message when running with jpda
>
> You have that message = You have started in debug mode = You tried
> connecting with a wrong client.
>
> I have impression that you have successfully started Tomcat in debug mode.
> The problem is that you cannot connect to it.
>
> Have you tried to connect with a proper debug client (IDE)?
Duh... I thought both the IDE AND the browser had to use port 8000. I now realize that port 8000 is just for the IDE to connect to the server and request a debugging session. The browser should still connect through 8080.
Now that I do that, everything works file.
Thx for the help everybody.
Alain
You may try using explicit IPv4 address, http://127.0.0.1:8000/
I wonder whether address=8000 can be used to specify IP address as well as port.
Also
> /Library/Tomcat
What version is that? Is it ours?
> I have a file /Library/Tomcat/bin/setenv
You tried many ways. I wonder which one wins.
All those environment variables are used to build the command line for
Java. I wonder whether java sees several copies of those options.
For example, if you start with suspend=y then Java will start, but it
will stop (like being on a breakpoint) at Tomcat startup sequence.
Have you looked into Tomcat log files? Look for output from
VersionLoggerListener.
http://tomcat.apache.org/tomcat-9.0-doc/config/listeners.html#Version_Logging_Lifecycle_Listener_-_org.apache.catalina.startup.VersionLoggerListener
Best regards,
Konstantin Kolinko
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Re: Can't start Tomcat in debug mode
Posted by Konstantin Kolinko <kn...@gmail.com>.
2018-07-16 15:56 GMT+03:00 Désilets, Alain <Al...@nrc-cnrc.gc.ca>:
>> lurodrig@:tomcat-9-0-5-installation$ lsof -i:8000
>> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
>> java 13522 lurodrig 4u IPv4 450991 0t0 TCP localhost:8000
>> (LISTEN)
>
> Gives me this
>
> java 2323 desilets 5u IPv4 0xad510ad86ad41671 0t0 TCP *:irdmi (LISTEN)
>
> which seems to indicate that Tomcat is NOT listening on locahost, but on something called *:irdmi. Not sure that this matters, because from what I can read on the net, *:irdmi corresponds to port 8000.
>
Note that the above lsof output for port 8000 says "IPv4",but the one
below for port 8080 says "IPv6".
>> lurodrig@:tomcat-9-0-5-installation$ lsof -i:8080
>> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
>> java 13522 lurodrig 51u IPv6 450993 0t0 TCP *:http-alt (LISTEN)
>
> Gives me this:
>
> java 2323 desilets 61u IPv6 0xad510ad8630f7d61 0t0 TCP *:http-alt (LISTEN)
>
> Again, I believe *:http-alt is just an alias for 8080, so it doesn't seem to matter.
>
> Note that if I start with 'catalina.sh start' (i.e. no jpda), I get *:http-al for 'lsof -8080' and nothing for 'lsof -8000'.
>
>> Hope it helps,
>
> So far, no. But I appreciate the effort. Any other ideas?
>
>> ps: a HTTP request against the debug port will print this message in the
>> catalina.out Debugger failed to attach: handshake failed - received >GET /
>> HTTP/1.1< - expected >JDWP-Handshake<
>
> Yep, I get that message when running with jpda
You have that message = You have started in debug mode = You tried
connecting with a wrong client.
I have impression that you have successfully started Tomcat in debug mode.
The problem is that you cannot connect to it.
Have you tried to connect with a proper debug client (IDE)?
You may try using explicit IPv4 address, http://127.0.0.1:8000/
I wonder whether address=8000 can be used to specify IP address as well as port.
Also
> /Library/Tomcat
What version is that? Is it ours?
> I have a file /Library/Tomcat/bin/setenv
You tried many ways. I wonder which one wins.
All those environment variables are used to build the command line for
Java. I wonder whether java sees several copies of those options.
For example, if you start with suspend=y then Java will start, but it
will stop (like being on a breakpoint) at Tomcat startup sequence.
Have you looked into Tomcat log files? Look for output from
VersionLoggerListener.
http://tomcat.apache.org/tomcat-9.0-doc/config/listeners.html#Version_Logging_Lifecycle_Listener_-_org.apache.catalina.startup.VersionLoggerListener
Best regards,
Konstantin Kolinko
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Re: Can't start Tomcat in debug mode
Posted by Désilets,
Alain <Al...@nrc-cnrc.gc.ca>.
Thx Luis,
> /Library/Tomcat/bin/catalina.sh jpda start should be good enough. If you
> have a look at the tomcat command line process are the JPDA options
> enabled? E.g.:
>
> $ $CATALINA_HOME/bin/catalina.sh jpda start
>
> $ ps -ef | grep --color dt_socket
> lurodrig 13522 2883 6 13:58 pts/5 00:00:04
> .../jdk1.8.0_162/bin/java...
> -agentlib:jdwp=transport=dt_socket,address=localhost:8000,server=y,suspend=n
> ... org.apache.catalina.startup.Bootstrap start
This is what I get:
501 2323 1 0 8:31am ttys001 0:25.08 /Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/bin/java
[...] -agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n [...] org.apache.catalina.startup.Bootstrap start
> In the catalina.out you should see something like: Listening for transport
> dt_socket at address: 8000
Yep, I get it.
> lurodrig@:tomcat-9-0-5-installation$ lsof -i:8000
> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> java 13522 lurodrig 4u IPv4 450991 0t0 TCP localhost:8000
> (LISTEN)
Gives me this
java 2323 desilets 5u IPv4 0xad510ad86ad41671 0t0 TCP *:irdmi (LISTEN)
which seems to indicate that Tomcat is NOT listening on locahost, but on something called *:irdmi. Not sure that this matters, because from what I can read on the net, *:irdmi corresponds to port 8000.
> lurodrig@:tomcat-9-0-5-installation$ lsof -i:8080
> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> java 13522 lurodrig 51u IPv6 450993 0t0 TCP *:http-alt (LISTEN)
Gives me this:
java 2323 desilets 61u IPv6 0xad510ad8630f7d61 0t0 TCP *:http-alt (LISTEN)
Again, I believe *:http-alt is just an alias for 8080, so it doesn't seem to matter.
Note that if I start with 'catalina.sh start' (i.e. no jpda), I get *:http-al for 'lsof -8080' and nothing for 'lsof -8000'.
> Hope it helps,
So far, no. But I appreciate the effort. Any other ideas?
> ps: a HTTP request against the debug port will print this message in the
> catalina.out Debugger failed to attach: handshake failed - received >GET /
> HTTP/1.1< - expected >JDWP-Handshake<
Yep, I get that message when running with jpda
Alain
Re: Can't start Tomcat in debug mode
Posted by Luis Rodríguez Fernández <uo...@gmail.com>.
Hello Alain,
/Library/Tomcat/bin/catalina.sh jpda start should be good enough. If you
have a look at the tomcat command line process are the JPDA options
enabled? E.g.:
$ $CATALINA_HOME/bin/catalina.sh jpda start
$ ps -ef | grep --color dt_socket
lurodrig 13522 2883 6 13:58 pts/5 00:00:04
.../jdk1.8.0_162/bin/java...
-agentlib:jdwp=transport=dt_socket,address=localhost:8000,server=y,suspend=n
... org.apache.catalina.startup.Bootstrap start
In the catalina.out you should see something like: Listening for transport
dt_socket at address: 8000
Asking for the debug and http ports:
lurodrig@:tomcat-9-0-5-installation$ lsof -i:8000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 13522 lurodrig 4u IPv4 450991 0t0 TCP localhost:8000
(LISTEN)
lurodrig@:tomcat-9-0-5-installation$ lsof -i:8080
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 13522 lurodrig 51u IPv6 450993 0t0 TCP *:http-alt (LISTEN)
Hope it helps,
Luis
ps: a HTTP request against the debug port will print this message in the
catalina.out Debugger failed to attach: handshake failed - received >GET /
HTTP/1.1< - expected >JDWP-Handshake<
2018-07-16 13:45 GMT+02:00 Désilets, Alain <Al...@nrc-cnrc.gc.ca>:
> I am unable to start Tomcat in debug mode. I have searched and see that
> lots of people are having similar issues. I tried all the fixes that were
> proposed and none of them seem to work.
>
> Here is what I have at the moment.
>
> I have a file /Library/Tomcat/bin/setenv with the following content
> # Trying to start Tomcat in debug mode...
> #
> # CATALINA_OPTS="-agentlib:jdwp=transport=dt_socket,address=
> 8000,server=y,suspend=n"
> JPDA_ADDRESS=8000
> JPDA_TRANSPORT=dtsocket
> JPDA_SUSPEND=n
>
> Note that I tried setting the JPDA environment both ways (using
> CATALINA_OPTS and JPDA_* vars) and the result is the same.
>
> To restart tomcat, I do the following command:
>
>
> echo "" > /Library/Tomcat/logs/catalina.out ;
> /Library/Tomcat/bin/shutdown.sh; sleep 2; /Library/Tomcat/bin/catalina.sh
> jpda start; echo "Restarted tomcat, catalina.out is:"; cat
> /Library/Tomcat/logs/catalina.out
>
> This produces the following output:
>
>
> Using CATALINA_BASE: /Library/Tomcat
>
> Using CATALINA_HOME: /Library/Tomcat
>
> Using CATALINA_TMPDIR: /Library/Tomcat/temp
>
> Using JRE_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_
> 102.jdk/Contents/Home
>
> Using CLASSPATH: /Library/Tomcat/bin/bootstrap.
> jar:/Library/Tomcat/bin/tomcat-juli.jar
>
> Using CATALINA_BASE: /Library/Tomcat
>
> Using CATALINA_HOME: /Library/Tomcat
>
> Using CATALINA_TMPDIR: /Library/Tomcat/temp
>
> Using JRE_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_
> 102.jdk/Contents/Home
>
> Using CLASSPATH: /Library/Tomcat/bin/bootstrap.
> jar:/Library/Tomcat/bin/tomcat-juli.jar
>
> Tomcat started.
>
> Restarted tomcat, catalina.out is:
>
>
>
> 16-Jul-2018 07:35:12.366 INFO [main] org.apache.catalina.core.StandardServer.await
> A valid shutdown command was received via the shutdown port. Stopping the
> Server instance.
>
> 16-Jul-2018 07:35:12.366 INFO [main] org.apache.coyote.AbstractProtocol.pause
> Pausing ProtocolHandler ["http-nio-8080"]
>
> 16-Jul-2018 07:35:12.426 INFO [main] org.apache.coyote.AbstractProtocol.pause
> Pausing ProtocolHandler ["ajp-nio-8009"]
>
> 16-Jul-2018 07:35:12.483 INFO [main] org.apache.catalina.core.StandardService.stopInternal
> Stopping service [Catalina]
>
> 16-Jul-2018 07:35:12.517 INFO [main] org.apache.coyote.AbstractProtocol.stop
> Stopping ProtocolHandler ["http-nio-8080"]
>
> 16-Jul-2018 07:35:12.520 INFO [main] org.apache.coyote.AbstractProtocol.stop
> Stopping ProtocolHandler ["ajp-nio-8009"]
>
> 16-Jul-2018 07:35:12.523 INFO [main] org.apache.coyote.AbstractProtocol.destroy
> Destroying ProtocolHandler ["http-nio-8080"]
>
> 16-Jul-2018 07:35:12.523 INFO [main] org.apache.coyote.AbstractProtocol.destroy
> Destroying ProtocolHandler ["ajp-nio-8009"]
>
>
>
> When I go to http://localhost:8000, I get “This site can’t be reached”.
>
>
>
> Same if I go to http://localhost:8080/.
>
>
>
> But… if I restart tomcat using the same command as above, except without
> the ‘jpda’ argument to Catalina.sh, then 8080 is started fine, but not 8000
> (which Is to be expected).
>
>
>
> I checked to see if port 8000 is already busy by issueing this command:
>
>
>
> sudo lsof -iTCP -sTCP:LISTEN -n -P | grep 8000
>
>
>
> But is shows no process listening on that port. And I know that this
> command works because when I successfully start tomcat without ‘jpda’, if I
> use this command to check for port 8080, I get:
>
>
>
> java 1925 desilets 60u IPv6 0xad510ad8630ef821 0t0 TCP
> *:8080 (LISTEN)
>
>
> Not sure what to try next… have pretty much run out of options at this
> point.
>
> Any help will be greatly appreciated.
>
> Thx.
>
> Alain Désilets
> National Research Council of Canad
>
--
"Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better."
- Samuel Beckett
RE: Can't start Tomcat in debug mode
Posted by Sebastian Trost <se...@dms-ag.ch>.
-----Original Message-----
From: Désilets, Alain <Al...@nrc-cnrc.gc.ca>
Sent: Monday, July 16, 2018 1:45 PM
To: Tomcat Users List <us...@tomcat.apache.org>
Subject: Can't start Tomcat in debug mode
> I am unable to start Tomcat in debug mode. I have searched and see that lots of people are having similar issues. I tried all the fixes that were proposed and none of them seem to work.
> Here is what I have at the moment.
> I have a file /Library/Tomcat/bin/setenv with the following content
> # Trying to start Tomcat in debug mode...
> #
> # CATALINA_OPTS="-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"
> JPDA_ADDRESS=8000
> JPDA_TRANSPORT=dtsocket
> JPDA_SUSPEND=n
Shouldn't it be "JDPA_TRANSPORT=dt_socket" - with the underscore?
Regards
Sebastian
[snip]