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https://issues.apache.org/jira/browse/CONFIGURATION-282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12508919
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Oliver Heger commented on CONFIGURATION-282:
--------------------------------------------
A NPE on this line would mean that getExpressionEngine() returns null, which
normally should not happen. Is it possible that you do something with
serialization or hot-deployment of your application? This could be an
explanation why the static defaultExpressionEngine field is null.
> 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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