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https://issues.apache.org/jira/browse/CONFIGURATION-282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12509651
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Oliver Heger commented on CONFIGURATION-282:
--------------------------------------------
So, the cause for this problem seems to be the static field for the default
expression engine in HierarchicalConfiguration. After a redeploy it obviously
looses its value and is set to null.
I guess, it should be possible to initialize it lazily when it is accessed and
it is null. But then the getDefaultExpressionEngine() method has to be
synchronized. Does anybody have a better idea? There are probably other static
fields in other classes, which can cause similar problems.
> NPE in HierarchicalConfiguration.fetchNodeList
> ----------------------------------------------
>
> Key: CONFIGURATION-282
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-282
> Project: Commons Configuration
> Issue Type: Bug
> Affects Versions: 1.4
> Environment: Linux, Java 1.5
> Reporter: Dennis Kieselhorst
>
> java.lang.NullPointerException
> at
> org.apache.commons.configuration.HierarchicalConfiguration.fetchNodeList(HierarchicalConfiguration.java:721)
> at
> org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.fetchNodeList(AbstractHierarchicalFileConfiguration.java:338)
> at
> org.apache.commons.configuration.HierarchicalConfiguration.getProperty(HierarchicalConfiguration.java:284)
> at
> org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.getProperty(AbstractHierarchicalFileConfiguration.java:319)
> at
> org.apache.commons.configuration.AbstractConfiguration.resolveContainerStore(AbstractConfiguration.java:1222)
> at
> org.apache.commons.configuration.AbstractConfiguration.getBoolean(AbstractConfiguration.java:667)
> at
> org.apache.commons.configuration.AbstractConfiguration.getBoolean(AbstractConfiguration.java:633)
> java.lang.NullPointerException
> at
> org.apache.commons.configuration.HierarchicalConfiguration.fetchNodeList(HierarchicalConfiguration.java:721)
> at
> org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.fetchNodeList(AbstractHierarchicalFileConfiguration.java:338)
> at
> org.apache.commons.configuration.HierarchicalConfiguration.getProperty(HierarchicalConfiguration.java:284)
> at
> org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.getProperty(AbstractHierarchicalFileConfiguration.java:319)
> at
> org.apache.commons.configuration.AbstractConfiguration.resolveContainerStore(AbstractConfiguration.java:1222)
> at
> org.apache.commons.configuration.AbstractConfiguration.getString(AbstractConfiguration.java:1097)
> at
> org.apache.commons.configuration.AbstractConfiguration.getString(AbstractConfiguration.java:1077)
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