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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CONFIGURATION-379) org.apache.commons.configuration.ConfigurationException: Cannot locate configuration source null
Date Wed, 01 Apr 2009 06:15:13 GMT

    [ https://issues.apache.org/jira/browse/CONFIGURATION-379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694403#action_12694403
] 

Ralph Goers commented on CONFIGURATION-379:
-------------------------------------------

OK. Your problem is as follows. 
1. CIMSystem is a singleton.
2. CIMSystem.execute is being called from multiple threads.
3. execute calls CIMConfiguration.configure.
4. CIMConfiguration has a PropertiesConfiguration as a class member variable.
5. The configure method sets this class member variable to a new PropertiesConfiguration.
6. setURL is called to set the url.
Here is the problem -
7. A second thread enters CIMConfiguration.configure and does "config = new PropertiesConfiguration()".
This new configuration doesn't have its url set.
8. The first thread calls load on the new PropertiesConfiguration created in step 7. 

> org.apache.commons.configuration.ConfigurationException: Cannot locate configuration
source null
> ------------------------------------------------------------------------------------------------
>
>                 Key: CONFIGURATION-379
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-379
>             Project: Commons Configuration
>          Issue Type: Bug
>    Affects Versions: 1.4
>         Environment: Windows XP, Tomcat 5.5 server, Quarts 1.6.0
>            Reporter: ranbir singh
>            Priority: Critical
>
> In one of my projects, we are using commons-configuration to read properties file.  There
are multiple threads that are trying to read property in this property file and many times
fails giving following exception:
> org.apache.commons.configuration.ConfigurationException: Cannot locate configuration
source null
> 	at org.apache.commons.configuration.AbstractFileConfiguration.load(AbstractFileConfiguration.java:213)
> 	at org.apache.commons.configuration.AbstractFileConfiguration.load(AbstractFileConfiguration.java:193)
> 	at com.mycomp.myapp.CIMConfiguration.configure(CIMConfiguration.java:104)
> 	at com.mycomp.myapp.CIMConfiguration.configure(CIMConfiguration.java:89)
> 	at com.mycomp.myapp.InterfaceJob.execute(InterfaceJob.java:64)
> 	at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
> 	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529)
> To my understanding, this error is reported from
> Class: AbstractFileConfiguration.java
> Method: load(String fileName) throws ConfigurationException
> {
>       URL url = ConfigurationUtils.locate(basePath, fileName);
>       if (url == null)
>       {
>              throw new ConfigurationException("Cannot locate configuration source " +
fileName); } 
>             load(url);
>       }
> I have checked& printed that the filename passed to this method is correct.
> Please advice

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