3 Replies Latest reply on Jul 7, 2006 5:43 PM by lafr

getResourceAsStream returns null when invoked from an EJB ja

offline Jul 5, 2006 12:00 PM

My application makes use of a configuration file stored inside a jar that ships in the EAR file. This config file is accessed by way of a classloader.getResourceAsStream(), where the classloader is returned from the Thread.getContextClassloader() method.

This operation succeeds on WebLogic and WebSphere as expected, but on JBoss 4.0.3SP1, I cannot get anything except a null input stream from this call.

My application is laid out as:

app.ear/
 ejb.jar/
 META-INF/MANIFEST.MF: Class-Path: ./config.jar
 com.my.classes.ConfigLoader
 config.jar/
 config.properties

The loader code is (in brief -- there's a lot of error checking et al that I have removed):

ClassLoader loader = Thread.currentThread().getContextClassLoader();
InputStream ins = loader.getResourceAsStream ("/config.properties");
if (ins == null) {
 System.out("The input stream was null after getResourceAsStream");
}
else {
 loadConfig(ins);
}

So, what I'm wondering is, of course, why does this not work? I've traced the classloader initialization, and it appears that the config jar is being added to the UCL (here is the trace output from a deployment, up to the point where the beans themselves are configured):

09:49:05,970 DEBUG [RepositoryClassLoader] Unregistering cl=org.jboss.mx.loading.UnifiedClassLoader3@1d77d9e{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12702app.ear ,addedOrder=30}
09:49:05,970 DEBUG [UnifiedLoaderRepository3] UnifiedLoaderRepository removed(true) org.jboss.mx.loading.UnifiedClassLoader3@1d77d9e{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12702app.ear ,addedOrder=30}
09:49:06,004 INFO [EARDeployer] Init J2EE application: file:/opt/md/jboss/server/default/deploy/app.ear
09:49:06,125 DEBUG [UnifiedClassLoader] New jmx UCL with url file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear
09:49:06,125 DEBUG [RepositoryClassLoader] setRepository, repository=org.jboss.mx.loading.UnifiedLoaderRepository3@10bc49d, cl=org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=0}
09:49:06,125 DEBUG [RepositoryClassLoader] setRepository, repository=org.jboss.mx.loading.UnifiedLoaderRepository3@10bc49d, cl=org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=0}
09:49:06,125 DEBUG [UnifiedLoaderRepository3] Adding org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=0}
09:49:06,126 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg:
09:49:06,509 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.aciworldwide.ecourier.utility
09:49:06,517 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.aciworldwide.ecourier.auth.jboss
09:49:06,521 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.aciworldwide.ecourier.auth
09:49:06,528 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/ejb.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,552 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/jrmsadm.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,554 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/ecjavautil.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,558 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: javax.mail
09:49:06,569 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: javax.mail.event
09:49:06,570 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: javax.mail.search
09:49:06,573 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: javax.mail.internet
09:49:06,579 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.mail.util
09:49:06,582 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.mail.smtp
09:49:06,585 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.mail.iap
09:49:06,587 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.mail.imap
09:49:06,594 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.mail.imap.protocol
09:49:06,599 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.mail.pop3
09:49:06,601 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.mail.handlers
09:49:06,602 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/mail.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,605 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: javax.activation
09:49:06,609 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.activation.registries
09:49:06,610 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: com.sun.activation.viewers
09:49:06,611 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/activation.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,615 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: conf
09:49:06,615 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: org.opensaml
09:49:06,642 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: org.opensaml.artifact
09:49:06,644 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: org.opensaml.provider
09:49:06,645 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: schemas
09:49:06,648 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/opensaml-1.1.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,814 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/xercesImpl.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,833 DEBUG [ClassLoaderUtils] Multiple class loaders found for pkg: org.w3c.dom
09:49:06,845 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/xml-apis.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,880 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/xstream-1.1.2.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}
09:49:06,881 DEBUG [RepositoryClassLoader] Added url: file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear-contents/config.jar, to ucl: org.jboss.mx.loading.UnifiedClassLoader3@13849df{ url=file:/opt/md/jboss/server/default/tmp/deploy/tmp12704app.ear ,addedOrder=32}

1. Re: getResourceAsStream returns null when invoked from an EJ

lafr Jul 5, 2006 3:24 PM (in response to offline)

We use this with JBoss-4.0.4 in a similar way.
You may try is without the leading slash in the resource's name. If I remember correct, this is not needed | not allowed.
The resouce is searched along the class path.
If it's in a subdirectory, e.g. META-INF then "META-INF/config.properties" has to be used.
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2. Re: getResourceAsStream returns null when invoked from an EJ

offline Jul 5, 2006 4:04 PM (in response to offline)

I'm not sure I understand:

The resource is not in META-INF in config.jar, it's in the root of the jar, and is at the root of the classpath. My understanding of getResourceAsStream was that if you don't provide the leading "/" character, it looks relative to the current class, which is undesired, since the config file sits elsewhere in the class tree.

How does that work?
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3. Re: getResourceAsStream returns null when invoked from an EJ

lafr Jul 7, 2006 5:43 PM (in response to offline)

I mentioned META-INF as an example how we use this. What I said is: Don't use the leading slash in the resouce name!

Look at http://www.javaworld.com/javaworld/javaqa/2003-08/01-qa-0808-property.html
for example fro some explanations.
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