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From Curtis Rueden <ctrue...@wisc.edu>
Subject Re: Is there a Maven plugin for the Java debugger (jdb)?
Date Tue, 15 Oct 2013 19:08:06 GMT
Hi Andrew,

Cool, glad you got it working. And if you get sick of passing the FQCN you
can of course do something like:

  <argument>com.my.stuff.${jdb}</argument>

Regards,
Curtis


On Tue, Oct 15, 2013 at 12:31 PM, Andrew Pennebaker
<apennebaker@42six.com>wrote:

> Ah, forgot to add the full namespace to the main class. This works:
>
> $ cat pom.xml
> ...
> <build>
>   <plugins>
>       <plugin>
>         <groupId>org.codehaus.mojo</groupId>
>         <artifactId>exec-maven-plugin</artifactId>
>         <configuration>
>           <executable>jdb</executable>
>           <arguments>
>             <argument>-classpath</argument>
>             <classpath />
>             <argument>${jdb}</argument>
>           </arguments>
>         </configuration>
>         <executions>
>           <execution>
>             <goals>
>               <goal>exec</goal>
>             </goals>
>           </execution>
>         </executions>
>       </plugin>
> ...
>
> $ mvn -Djdb=com.my.stuff.HelloWorld exec:exec
> run
>
>
> On Tue, Oct 15, 2013 at 11:50 AM, Curtis Rueden <ctrueden@wisc.edu> wrote:
>
> > Hi Andrew,
> >
> > > Exception occurred: java.lang.ClassNotFoundException
> > > (uncaught)"thread=main", java.net.URLClassLoader$1.run(), line=202
> bci=73
> >
> > Not sure what to tell you. I tested it with my project and was able to
> > launch my app from jdb as usual; see:
> >
> >
> https://github.com/imagej/imagej/commit/8cfe0fde7d89c71e083c992f5c7432b29f09c483
> >
> > > Are we sure the <argument>-classpath</argument><classpath />
bit is
> > > the correct way to hand jdb the CLASSPATH?
> >
> > Yep, at least on my OS X system with Sun Java 1.7.0_21:
> >
> > $ jdb -version
> > This is jdb version 1.6 (Java SE version 1.7.0_21)
> >
> > $ jdb -help | grep classpath
> >     -classpath <directories separated by ":">
> >
> > Is your "HelloMaven" class really in the default package? What happens if
> > you change "jdb" to "java" in your exec; can you launch your application
> in
> > non-debug mode that way? If not, there is something fishy with either
> your
> > java main class or your classpath.
> >
> > Regards,
> > Curtis
> >
> >
> > On Mon, Oct 14, 2013 at 8:56 AM, Andrew Pennebaker <
> apennebaker@42six.com
> > >wrote:
> >
> > > So close! I added the snippet inside my
> > > <build><plugins>...</plugins></build> in pom.xml. Thanks
for supplying
> > the
> > > exact code, by the way!
> > >
> > > But jdb is showing an error:
> > >
> > > $ mvn exec:exec -Djdb.mainClass=HelloMaven
> > > Initializing jdb ...
> > > > run
> > > run HelloMaven
> > > Set uncaught java.lang.Throwable
> > > Set deferred uncaught java.lang.Throwable
> > > >
> > > VM Started:
> > > Exception occurred: java.lang.ClassNotFoundException
> > > (uncaught)"thread=main", java.net.URLClassLoader$1.run(), line=202
> bci=73
> > >
> > > main[1]
> > >
> > > This happens for any class I hand exec:exec.
> > >
> > > This is the same error I see if I try to jdb <Class> manually.
> > >
> > > Are we sure the <argument>-classpath</argument><classpath />
bit is the
> > > correct way to hand jdb the CLASSPATH?
> > >
> > >
> > > On Fri, Oct 11, 2013 at 4:20 PM, Curtis Rueden <ctrueden@wisc.edu>
> > wrote:
> > >
> > > > Hi Andrew,
> > > >
> > > > > Could you elaborate on the exact <plugin>...</plugin>
snippet I
> would
> > > > > need to drop into my pom.xml in order to achieve this?
> > > >
> > > > <plugin>
> > > >   <groupId>org.codehaus.mojo</groupId>
> > > >   <artifactId>exec-maven-plugin</artifactId>
> > > >   <version>1.2.1</version>
> > > >   <configuration>
> > > >     <executable>jdb</executable>
> > > >     <arguments>
> > > >       <argument>-classpath</argument>
> > > >       <classpath />
> > > >       <argument>${jdb.mainClass}</argument>
> > > >     </arguments>
> > > >   </configuration>
> > > >   <executions>
> > > >     <execution>
> > > >       <goals>
> > > >         <goal>exec</goal>
> > > >       </goals>
> > > >     </execution>
> > > >   </executions>
> > > > </plugin>
> > > >
> > > > > If I could just `mvn exec:exec <Class>`, starting a jdb session
on
> > > > > <Class>.main(), that would be *perfect*.
> > > >
> > > > We can get close. If you use the block above, you would launch with:
> > > >
> > > >     mvn -Djdb.mainClass=<Class> exec:exec
> > > >
> > > > Where "jdb.mainClass" is the property used in the XML above. And if
> > that
> > > is
> > > > not concise enough for your taste you can choose a property with a
> > > shorter
> > > > name.
> > > >
> > > > Working example inside a profile with a specific main class is here:
> > > >
> > > >
> > > >
> > >
> >
> https://github.com/imagej/imagej/commit/8cfe0fde7d89c71e083c992f5c7432b29f09c483
> > > >
> > > > Regards,
> > > > Curtis
> > > >
> > > >
> > > > On Fri, Oct 11, 2013 at 1:47 PM, Andrew Pennebaker <
> > > apennebaker@42six.com
> > > > >wrote:
> > > >
> > > > > Thank you, Curtis, that looks like an excellent suggestion!
> > > > >
> > > > > Could you elaborate on the exact <plugin>...</plugin>
snippet I
> would
> > > > need
> > > > > to drop into my pom.xml in order to achieve this?
> > > > >
> > > > > If I could just `mvn exec:exec <Class>`, starting a jdb session
on
> > > > > <Class>.main(), that would be *perfect*.
> > > > >
> > > > >
> > > > > On Fri, Oct 11, 2013 at 1:20 PM, Curtis Rueden <ctrueden@wisc.edu>
> > > > wrote:
> > > > >
> > > > > > Hi all,
> > > > > >
> > > > > > Rather than getting into an eclipse vs. vim vs. emacs flamewar,
> I'd
> > > > > rather
> > > > > > just ask: Andrew, did you try attaching your jdb to a running
> java
> > > > > instance
> > > > > > launched via exec-maven-plugin as I suggested yet?
> > > > > >
> > > > > > You can configure exec-maven-plugin in your pom so that launching
> > the
> > > > > > compatible java process is as easy as "mvn exec:exec". You could
> > even
> > > > > > specify jdb as the executable directly if that's what you want
> and
> > > then
> > > > > you
> > > > > > wouldn't even need the attachment step. Using profiles (yes,
this
> > is
> > > > one
> > > > > of
> > > > > > their benign uses!) you can even set up multiple different
> > behaviors
> > > of
> > > > > > exec:exec for different common situations. Really I don't think
> > there
> > > > is
> > > > > > any need whatsoever for a dedicated "mvn exec:jdb" here.
> > > > > >
> > > > > > -Curtis
> > > > > > On Oct 11, 2013 10:53 AM, "Andrew Pennebaker" <
> > apennebaker@42six.com
> > > >
> > > > > > wrote:
> > > > > >
> > > > > > > Why would anyone want to do this? So we don't have to debug
> Maven
> > > > > > projects
> > > > > > > with Eclipse/IntelliJ, but the text editor of our choice.
This
> is
> > > > best
> > > > > > > accomplished by Maven tasks which interact with the command
> line
> > > jdb
> > > > > > tool.
> > > > > > >
> > > > > > >
> > > > > > > On Thu, Oct 10, 2013 at 5:27 PM, Russell Gold <
> > russ@gold-family.us
> > > >
> > > > > > wrote:
> > > > > > >
> > > > > > > > Why do you want to do that? I suspect we are not getting
at
> > your
> > > > > actual
> > > > > > > > requirement.
> > > > > > > >
> > > > > > > > On Oct 10, 2013, at 2:25 PM, Andrew Pennebaker <
> > > > > apennebaker@42six.com>
> > > > > > > > wrote:
> > > > > > > >
> > > > > > > > > Yes, various Java IDEs can debug Java code, including
Java
> > code
> > > > > > > organized
> > > > > > > > > in Maven projects. What I'm interested in is
debugging Java
> > > code
> > > > > in a
> > > > > > > > Maven
> > > > > > > > > project with an arbitrary text editor, not necessarily
> > Eclipse
> > > or
> > > > > > > > Intellij,
> > > > > > > > > for example Emacs, or even Notepad, by invoking
Maven tasks
> > > that
> > > > > > point
> > > > > > > to
> > > > > > > > > Maven plugins that interact with jdb.
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On Thu, Oct 10, 2013 at 2:09 PM, Sankaran, Nambi
<
> > > > > nsankaran@ebay.com
> > > > > > >
> > > > > > > > wrote:
> > > > > > > > >
> > > > > > > > >> It very is easy to debug maven from eclipse,
I have
> > documented
> > > > > how I
> > > > > > > > debug
> > > > > > > > >> maven-jetty-plugin using eclipse
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> http://nambisankaran.wordpress.com/2012/06/30/running-jetty-server-with-maven/
> > > > > > > > >>
> > > > > > > > >> -----Original Message-----
> > > > > > > > >> From: Andrew Pennebaker [mailto:apennebaker@42six.com]
> > > > > > > > >> Sent: Thursday, October 10, 2013 11:04 AM
> > > > > > > > >> To: Maven Users List
> > > > > > > > >> Subject: Re: Is there a Maven plugin for
the Java debugger
> > > > (jdb)?
> > > > > > > > >>
> > > > > > > > >> I could also use an IDE for package management,
but I'd
> > rather
> > > > use
> > > > > > > plain
> > > > > > > > >> Maven and an arbitrary text editor instead.
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> On Thu, Oct 10, 2013 at 11:21 AM, Russell
Gold <
> > > > > russ@gold-family.us
> > > > > > >
> > > > > > > > >> wrote:
> > > > > > > > >>
> > > > > > > > >>> The simplest way to do this is actually
to run it in your
> > IDE
> > > > > > > directly.
> > > > > > > > >>> IntellijIDEA community edition can import
your maven
> > project
> > > > and
> > > > > > thus
> > > > > > > > >>> get all of the dependencies. Then you
just run the
> program
> > in
> > > > the
> > > > > > > > >>> debugger. I presume Eclipse can do something
similar.
> > > > > > > > >>>
> > > > > > > > >>> On Oct 10, 2013, at 10:52 AM, Andrew
Pennebaker
> > > > > > > > >>> <apennebaker@42six.com>
> > > > > > > > >>> wrote:
> > > > > > > > >>>
> > > > > > > > >>>> Yes. I'm looking for a task like
`mvn jdb:debug <Class>`
> > > that
> > > > > > starts
> > > > > > > > >>>> a
> > > > > > > > >>> jdb
> > > > > > > > >>>> session on <Class>.main().
> > > > > > > > >>>>
> > > > > > > > >>>> I can run jdb on individual Java
code outside of a Maven
> > > > > > structure,
> > > > > > > > >>>> but
> > > > > > > > >>> I'm
> > > > > > > > >>>> not sure how to inform jdb of Java
code in a Maven
> > project,
> > > > > > Maven's
> > > > > > > > >>>> CLASSPATH handling, etc. etc.
> > > > > > > > >>>>
> > > > > > > > >>>>
> > > > > > > > >>>> On Thu, Oct 10, 2013 at 10:46 AM,
Benson Margulies <
> > > > > > > > >>> bimargulies@gmail.com>wrote:
> > > > > > > > >>>>
> > > > > > > > >>>>> What would that mean? Do you
want to execute the
> program
> > in
> > > > the
> > > > > > > > >>> debugger?
> > > > > > > > >>>>>
> > > > > > > > >>>>> On Thu, Oct 10, 2013 at 10:38
AM, Andrew Pennebaker
> > > > > > > > >>>>> <apennebaker@42six.com>
wrote:
> > > > > > > > >>>>>> I'd like to run jdb over
some of my classes in a Maven
> > > > > project.
> > > > > > Is
> > > > > > > > >>> there
> > > > > > > > >>>>> a
> > > > > > > > >>>>>> plugin I can drop into my
pom.xml?
> > > > > > > > >>>>>
> > > > > > > > >>>>>
> > > > > >
> -------------------------------------------------------------------
> > > > > > > > >>>>> -- To unsubscribe, e-mail:
> > > > users-unsubscribe@maven.apache.org
> > > > > > > > >>>>> For additional commands, e-mail:
> > > users-help@maven.apache.org
> > > > > > > > >>>>>
> > > > > > > > >>>>>
> > > > > > > > >>>
> > > > > > > > >>> -----------------
> > > > > > > > >>> Author, Getting Started with Apache Maven
<
> > > > > > > > >>>
> > > > http://www.packtpub.com/getting-started-with-apache-maven/video>
> > > > > > > > >>>
> > > > > > > > >>> Come read my webnovel, Take a Lemon <
> > > http://www.takealemon.com
> > > > >,
> > > > > > and
> > > > > > > > >>> listen to the Misfile radio play <
> > > > > > > > >>> http://www.fuzzyfacetheater.com/misfile/>!
> > > > > > > > >>>
> > > > > > > > >>>
> > > > > > > > >>>
> > > > > > > > >>>
> > > > > > > > >>>
> > > > > > > > >>>
> > > > > > > > >>>
> > > > > > > > >>>
> > > > > > > > >>
> > > > > > > > >>
> > > > > >
> > ---------------------------------------------------------------------
> > > > > > > > >> To unsubscribe, e-mail:
> users-unsubscribe@maven.apache.org
> > > > > > > > >> For additional commands, e-mail:
> > users-help@maven.apache.org
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > >
> > > > > > > > -----------------
> > > > > > > > Author, Getting Started with Apache Maven <
> > > > > > > >
> > http://www.packtpub.com/getting-started-with-apache-maven/video>
> > > > > > > >
> > > > > > > > Come read my webnovel, Take a Lemon <
> http://www.takealemon.com
> > >,
> > > > > > > > and listen to the Misfile radio play <
> > > > > > > > http://www.fuzzyfacetheater.com/misfile/>!
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
>
>
> --
> Cheers,
>
> Andrew Pennebaker
> apennebaker@42six.com
>

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