Thanks for putting up your experience in the form of a blog. The insights are really helpful, not to mention a big boost for people like me taking the OSGi route for the first time.
Meanwhile, I've tried couple of options to resolve my issue and both seemed to be working. 1. Externalizing the file and use file:///absolute_file_path 2. I extended ObjectContainerFactoryBean and instead and overriden the method to use inputstream and generate the file instead of using the getFile() from OSGiBundleResource. Now, I've got into another issue, which if ofcourse seperate from this. Thanks for your help again, appreciate it. 2011/6/16 ext2 <[email protected]> > I have encounter lots of class/resource not found exceptions while using > Spring DM too. > Even, I feel nervously when hear issues of classpath. :). > > Most exceptions I have encountered are somewhat relate to thread context > class loader. if only spring and osgi, everything will be fine and ok. > Trust > spring and osgi, they works very well, if there is no context class loader > and dynamic class loading. > > Ps. Following is a short memo of issues I have encountered. Maybe it's > useful to you. > > http://ext2xhb.wordpress.com/2011/06/16/take-care-of-the-exception-of-classr > esource-finding-caused-by-spring-dm-in-osgi/<http://ext2xhb.wordpress.com/2011/06/16/take-care-of-the-exception-of-classresource-finding-caused-by-spring-dm-in-osgi/> > > > > -----original ----- > > Sender: Shamik Bandopadhyay [mailto:[email protected]] > > Date: 2011/6/16 17:13 > > Receiver: [email protected] > > Subject: Re: Spring resource classpath issue > > > > I took a look into the ResourceUtils code and here's what I've observed. > > > > In ResourceUtils.getFile(), > > > > the following piece of code is being referred, > > > > *if (!URL_PROTOCOL_FILE.equals(resourceUrl.getProtocol())) {* > > * throw new FileNotFoundException(* > > * description + " cannot be resolved to absolute file path " > +* > > * "because it does not reside in the file > system: > " > > + resourceUrl);* > > *}* > > ** > > The value of resourceUrl is "bundle://258.0:1/repo/test.db4o". Now, its > > trying to match "file" with "bundle" as part of the condition which is > > subsequently throwing the exception. > > > > I'll try to to use an absolute file location again instead of an embedded > > classpath file and see the result. I hope it works out since I don't have > > the choice to change the Db4o libraries. > > > > Thanks a lot for doing the research and helping me understand the issue. > > Appreciate your help. > > > > I'll post my result. > > > > On Thu, Jun 16, 2011 at 1:54 AM, ext2 <[email protected]> wrote: > > >> -----original----- > > >> Sender: Shamik Bandopadhyay [mailto:[email protected]] > > >> Date: 2011/6/16 16:09 > > >> Receiver: [email protected] > > >> Subject: Re: Spring resource classpath issue > > >> > > >> Thanks for looking into this problem.... > > >> > > >> To answer your question, the file is a read/write object database. I > > >> tried externalizing the file instead of embedding it within the jar, > > > > > > resource in bundle's class path cannot be write, you should put it in > file > > system. > > > > > >> unfortunately, using file://absolute_path throws the same exception. > > > > > > Same exception may not be same reason. Make sure file url is correct; > > (etc: file:///d:/a, file:/d:/a, are both point to file d:\a. But > file://d:/a > > is not a correct url); > > > > > >> As per your observation, I'm not sure I understand the last point. You > > >> mentioned " OsgiBundleResource try locate File by your bundle's > > >> location on the file system; But it doesn't exist, so exception > > > > > > > > > resource.getURL() will return a resource url from bundle classpath; But > > you application called Resource.getFile(). > > > So OsgiBundleResource will can only first try to locate it from bundle > > location (normally , bundle location == url where you install bundle); > > > > > >> raised." I'm trying to understand the fact where does it differ > > >> compared to a non-osgi environment ? I've the same code running w/o an > > >> issue as long as the file is in the classpath. > > > > > > Spring will choice the resource's implementation for you given url > > (classpath:/....db4o.). In osgi, OsgiBundleResource is choosed. But none > > osgi environment, ClassPathResource ,UrlResource,or something else(I am > not > > sure) will be choosed; > > > > > > > > >> On Thu, Jun 16, 2011 at 12:38 AM, ext2 <[email protected]> wrote: > > >> > > > >> > The immediate cause is : db4o/ ObjectContainerFactoryBean is ask for > a > > file > > >> on file system, so OsgiBundleResource cannot return the resource on > the > > >> classpath, the only thing OsgiBundleResource can do is try locate it > from > > the > > >> bundle's location, but it doesn't exists; > > >> > > > >> > I am not familiar with db4o, so I don't why it always ask for file > , > > and > > >> cannot ask for a input stream from class path resource; > > >> > > > >> > Is it a file only for read or a file for read/write? > > >> > 1) If it's a file only for read, maybe you can check the spring > > reference > > >> to see if other properties could configure it; > > >> > 2) if it's a file for read/write (etc a database file store data), > > maybe you > > >> should using store it on file system. > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > Spring dm 's OsgiBundleResource will try to locate the File from the > > location > > >> where you bundle installed. > > >> > This means : > > >> > 1) resource has been find in classpath > > >> > 2) other application is try to use File relative to the bundle > (here > > is > > >> the Db4o.openFile). > > >> > 3) OsgiBundleResource try locate File by your bundle's location on > the > > file > > >> system; But it doesn't exist, so exception raised. > > >> > > > >> >> -----original ----- > > >> >> Sender: Shamik Bandopadhyay [mailto:[email protected]] > > >> >> Date: 2011/6/16 15:04 > > >> >> Receiver: [email protected] > > >> >> Subject: Re: Spring resource classpath issue > > >> >> > > >> >> I've checked that...here's the exception stack trace ... > > >> >> > > >> >> "caused by: java.io.FileNotFoundException: OSGi > > >> >> resource[classpath:taxonomy.db4o| > > >> >> nd.id=335|bnd.sym=taxonomydaoimplbundle] cannot be resolved to > > >> >> absolute file path > > >> >> at > > >> >> > > >> > > > org.springframework.osgi.io.OsgiBundleResource.getFile(OsgiBundleResorce.j > > >> >> ava:345) > > >> >> at > > >> >> > > >> > > > org.springmodules.db4o.ObjectContainerFactoryBean.afterPropertiesSet(bject > > >> >> ContainerFactoryBean.java:104) > > >> >> at > > >> >> > > >> > > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanactor > > >> >> y.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1477) > > >> >> at > > >> >> > > >> > > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanactor > > >> >> y.initializeBean(AbstractAutowireCapableBeanFactory.java:1417) > > >> >> ... 45 more > > >> >> aused by: java.io.FileNotFoundException: OSGi > > >> >> > > >> > > resource[classpath:taxonomy.db4o|nd.id > =335|bnd.sym=taxonomydaoimplbundle] > > >> >> cannot be resolved to absolute file pah because it does not reside > in > > >> >> the file system: bundle://335.0:1/taxonomy.db4o > > >> >> > > >> >> at > > >> >> > org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:242 > > >> >> > > >> >> at > > >> >> > org.springframework.osgi.io.OsgiBundleResource.getFile(OsgiBundleReso > > >> >> rce.java:342) > > >> >> ... 48 more" > > >> >> > > >> >> The exception is being thrown from spring > OsgiBundleResource.getFile() > > >> method. > > >> >> > > >> >> It happens when spring module ObjectContainerFactoryBean is trying > to > > >> >> execute the following code : > > >> >> > > >> >> if (databaseFile != null) { > > >> >> container = Db4o.openFile(configuration, > > >> >> databaseFile.getFile().getAbsolutePath()); > > >> >> log.info("opened db4o local file-based objectContainer @" + > > >> >> ObjectUtils.getIdentityHexString(container)); > > >> >> } > > >> >> > > >> >> databaseFile is a org.springframework.core.io.Resource object whose > > >> >> value is being injected by spring app context, i.e. the db4o path > > >> >> (classpath:META-INF/spring/repo/test.db4o) . The exception is > > >> >> happening at OsgiBundleResource.getFile() when > > >> >> ObjectContainerFactoryBean is trying to execute > > >> >> databaseFile.getFile().getAbsolutePath()). > > >> >> > > >> >> Here's the getFile() method in OsgiBundleResource. > > >> >> > > >> >> public File getFile() throws IOException { > > >> >> // locate the file inside the bundle only known > prefixes > > >> >> if (searchType != > OsgiResourceUtils.PREFIX_TYPE_UNKNOWN) > > >> { > > >> >> String bundleLocation = bundle.getLocation(); > > >> >> int prefixIndex = > > >> >> bundleLocation.indexOf(ResourceUtils.FILE_URL_PREFIX); > > >> >> if (prefixIndex > -1) { > > >> >> bundleLocation = > > >> bundleLocation.substring(prefixIndex + > > >> >> ResourceUtils.FILE_URL_PREFIX.length()); > > >> >> } > > >> >> File file = new File(bundleLocation, path); > > >> >> if (file.exists()) { > > >> >> return file; > > >> >> } > > >> >> // fall back to the URL discovery (just in > case) > > >> >> } > > >> >> > > >> >> try { > > >> >> return ResourceUtils.getFile(getURI(), > > >> getDescription()); > > >> >> } > > >> >> catch (IOException ioe) { > > >> >> throw (IOException) new > > >> >> FileNotFoundException(getDescription() > > >> >> + " cannot be resolved to > > >> absolute file > > >> >> path").initCause(ioe); > > >> >> } > > >> >> } > > >> >> > > >> >> On Wed, Jun 15, 2011 at 11:07 PM, ext2 <[email protected]> wrote: > > >> >> > According to your resource, the Spring has find the the resource > in > > >> classpath > > >> >> ( the url contains's the bundle id) > > >> >> > > > >> >> > But it seems the db4o is trying to use the classpath resource as > a > > File. > > >> >> > Makesure if Db4o.openFile() can accept a classpath resource. if > it > > cannot, > > >> >> Your exception will be reasonable;( I am not familiar with db4o, > you > > can > > >> try > > >> >> it) > > >> >> > > > >> >> > I guess the exception is throw from Db4o, not from spring , is > it? > > >> >> > > > >> >> > > > >> >> >> -----original----- > > >> >> >> Sender: Shamik Bandopadhyay [mailto:[email protected]] > > >> >> >> Date: 2011/6/15 9:25 > > >> >> >> Receiver: [email protected] > > >> >> >> Subject: Re: Spring resource classpath issue > > >> >> >> > > >> >> >> Well, even with setting the context class loader through > activator, > > it > > >> >> >> didn't work out. I'm still facing the issue, not sure what else > I > > can > > >> >> >> do at this point. I saw the following article which confirms > that > > >> >> >> spring dm takes care of the thread context loader issue. > > >> >> >> > > >> >> >> > > >> >> > > >> > > > http://blog.springsource.com/2008/05/02/running-spring-applications-on-osg > > >> >> >> i-with-the-springsource-application-platform/ > > >> >> >> > > >> >> >> On Tue, Jun 14, 2011 at 11:40 AM, Shamik Bandopadhyay < > > [email protected]> > > >> >> >> wrote: > > >> >> >> > Thanks for the link John...my understanding was > spring-extender > > is > > >> >> >> > supposed to take care of setting the right classloader instead > of > > us > > >> >> >> > doing it explicitly in activator. It doesn't seem to be very > > >> >> >> > efficient. I'll give it a try by writing an activator and load > > the > > >> >> >> > Spring application context .... > > >> >> >> > > > >> >> >> > On Tue, Jun 14, 2011 at 7:25 AM, <[email protected]> > > wrote: > > >> >> >> >> Take a look at this, > > >> >> >> >> > > >> >> >> > > >> >> > > >> > > > http://www.dynamicjava.org/articles/osgi-matters/3rd-party-components-with > > >> >> >> > > >> >> > > >> > > > -osgi/11-osgi-matters/43-3rd-party-components-incompatibility-problems?tmp > > >> >> >> l=component&print=1&page= > > >> >> >> >> > > >> >> >> >> Quoting Shamik Bandopadhyay <[email protected]>: > > >> >> >> >> > > >> >> >> >>> Well, that's the part which is puzzling. I don't see any > reason > > why > > >> >> >> >>> Spring would use a seperate classloader.I've even tried > > including > > >> the > > >> >> >> >>> db4o file under > > >> >> >> >>> > > >> >> >> >>> > > >> >> >> > > >> >> > > >> > > > <input-resource>META-INF/spring/repo/test.db4o=target/classes/META-INF/spr > > >> >> >> ing/repo/test.db4o</input-reource> > > >> >> >> >>> , but issue remains the same... > > >> >> >> >>> > > >> >> >> >>> On Mon, Jun 13, 2011 at 12:42 PM, <[email protected] > > > > wrote: > > >> >> >> >>>> > > >> >> >> >>>> I'm no expert but my best guess would be that spring is > trying > > to > > >> load > > >> >> >> >>>> the > > >> >> >> >>>> file from the wrong classloader. If I'm reading the spring > > source > > >> >> >> >>>> correctly, > > >> >> >> >>>> it will attempt to load > > "classpath:META-INF/spring/repo/test.db4o" > > >> >> from > > >> >> >> >>>> Thread.currentThread().getContextClassLoader() and then > from > > >> >> >> >>>> ClassUtils.class.getClassLoader() if that fails. That's my > 2 > > cents > > >> >> >> >>>> anyway. > > >> >> >> >>>> > > >> >> >> >>>> Quoting Shamik Bandopadhyay <[email protected]>: > > >> >> >> >>>> > > >> >> >> >>>>> The file is in the same bundle and located inside > > >> >> >> >>>>> src/resources/META-INF/spring/repo/test.db4o. I've > confirmed > > this > > >> in > > >> >> >> >>>>> the generated bundle as well. > > >> >> >> >>>>> > > >> >> >> >>>>> On Mon, Jun 13, 2011 at 8:40 AM, Tribon Cheng < > > [email protected]> > > >> >> >> >>>>> wrote: > > >> >> >> >>>>>> > > >> >> >> >>>>>> Resources are loaded in the same way as classes. Make > sure > > the > > >> file > > >> >> is > > >> >> >> >>>>>> under > > >> >> >> >>>>>> the classpath, and is exported if it is used in different > > bundle. > > >> >> >> >>>>>> 在 2011-6-13 下午11:25，"Shamik Bandopadhyay" > > >> <[email protected]> > > >> >> 写 > > >> >> >> 道： > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> Hi, > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> I'm trying to deploy a spring based bundle in osgi (fuse > > esb).In > > >> >> >> >>>>>>> spring context, I'm referring to a db4o file which is > > inside > > >> >> resources > > >> >> >> >>>>>>> folder. As per my understanding, a maven project will > make > > sure > > >> that > > >> >> >> >>>>>>> any file available under resources folder will be > available > > in > > >> >> project > > >> >> >> >>>>>>> classpath. I've kept the file under > > >> >> >> >>>>>>> resources/META-INF/spring/repo/test.db4o. > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> Here's the entry in spring context. > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> <bean id="objectContainer" > > >> >> >> >>>>>>> > class="org.springmodules.db4o.ObjectContainerFactoryBean"> > > >> >> >> >>>>>>> <property name="databaseFile" > > >> >> >> >>>>>>> value="classpath:META-INF/spring/repo/test.db4o" /> > > >> >> >> >>>>>>> </bean> > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> Once I install and try to start the application, I'm > > getting the > > >> >> >> >>>>>>> following exception. > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> "java.io.FileNotFoundException: OSGi > > >> >> >> >>>>>>> resource[classpath:META-INF/spring/repo/test.db4o| > bnd.id > > >> >> >> >>>>>> > > >> >> >> >>>>>> =258|bnd.sym=taxonomydaoimplbundle] > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> cannot be resolved to absolute file path because it does > > not reside > > >> >> >> in > > >> >> >> >>>>>>> the file system: > > >> bundle://258.0:1/META-INF/spring/repo/test.db4o" > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> I've tried different combinations, but Felix doesn't > seem > > to > > >> >> recognize > > >> >> >> >>>>>>> this file. Any pointer will be appreciated. > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> - Thanks > > >> >> >> >>>>>>> > > >> >> >> >>>>>>> > > >> >> >> > > --------------------------------------------------------------------- > > >> >> >> >>>>>>> To unsubscribe, e-mail: > [email protected] > > >> >> >> >>>>>>> For additional commands, e-mail: > > [email protected] > > >> >> >> >>>>>>> > > >> >> >> >>>>>> > > >> >> >> >>>>> > > >> >> >> >>>>> > > >> >> >> > > --------------------------------------------------------------------- > > >> >> >> >>>>> To unsubscribe, e-mail: > [email protected] > > >> >> >> >>>>> For additional commands, e-mail: > [email protected] > > >> >> >> >>>>> > > >> >> >> >>>>> > > >> >> >> >>>> > > >> >> >> >>>> > > >> >> >> >>>> > > >> >> >> >>>> > > >> >> >> >>>> > > >> >> > --------------------------------------------------------------------- > > >> >> >> >>>> To unsubscribe, e-mail: [email protected] > > >> >> >> >>>> For additional commands, e-mail: > [email protected] > > >> >> >> >>>> > > >> >> >> >>>> > > >> >> >> >>> > > >> >> >> >>> > > >> >> > --------------------------------------------------------------------- > > >> >> >> >>> To unsubscribe, e-mail: [email protected] > > >> >> >> >>> For additional commands, e-mail: > [email protected] > > >> >> >> >>> > > >> >> >> >>> > > >> >> >> >> > > >> >> >> >> > > >> >> >> >> > > >> >> >> >> > > >> >> >> >> > > >> --------------------------------------------------------------------- > > >> >> >> >> To unsubscribe, e-mail: [email protected] > > >> >> >> >> For additional commands, e-mail: [email protected] > > >> >> >> >> > > >> >> >> >> > > >> >> >> > > > >> >> >> > > >> >> >> > > --------------------------------------------------------------------- > > >> >> >> To unsubscribe, e-mail: [email protected] > > >> >> >> For additional commands, e-mail: [email protected] > > >> >> > > > >> >> > > > >> >> > > > >> >> > > > >> >> > > > --------------------------------------------------------------------- > > >> >> > To unsubscribe, e-mail: [email protected] > > >> >> > For additional commands, e-mail: [email protected] > > >> >> > > > >> >> > > > >> >> > > >> >> > --------------------------------------------------------------------- > > >> >> To unsubscribe, e-mail: [email protected] > > >> >> For additional commands, e-mail: [email protected] > > >> > > > >> > > > >> > > > >> > > > >> > > --------------------------------------------------------------------- > > >> > To unsubscribe, e-mail: [email protected] > > >> > For additional commands, e-mail: [email protected] > > >> > > > >> > > > >> > > >> --------------------------------------------------------------------- > > >> To unsubscribe, e-mail: [email protected] > > >> For additional commands, e-mail: [email protected] > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: [email protected] > > > For additional commands, e-mail: [email protected] > > > > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
