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From "James Abley (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (WW-3689) NullPointerException coming from Settings / LegacyPropertiesConfigurationProvider (thread-safety issue?)
Date Tue, 04 Oct 2011 11:00:35 GMT
NullPointerException coming from Settings / LegacyPropertiesConfigurationProvider (thread-safety
issue?)
--------------------------------------------------------------------------------------------------------

                 Key: WW-3689
                 URL: https://issues.apache.org/jira/browse/WW-3689
             Project: Struts 2
          Issue Type: Bug
    Affects Versions: 2.2.3.1, 2.0.14
         Environment: Any; multi-core machines tend to demonstrate the problem more readily
though.
            Reporter: James Abley


When running a load test, we intermittently see failures with this stack trace (the line numbers
are for 2.0.14, but we also see this with 2.2.3.1):

{noformat}
Exception in thread "MultiThreadTestRunner-5" java.lang.NullPointerException
	at org.apache.struts2.config.Settings.get(Settings.java:175)
	at org.apache.struts2.config.Settings.getDefaultInstance(Settings.java:293)
	at org.apache.struts2.config.Settings.getInstance(Settings.java:109)
	at org.apache.struts2.config.LegacyPropertiesConfigurationProvider.register(LegacyPropertiesConfigurationProvider.java:67)
	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:131)
	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
	at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)
	at com.example.platform.test.servlet.OurServlet.handleRequest(OurServlet.java:64)
{noformat}

or

{noformat}
Caused by: java.lang.NullPointerException
	at org.apache.struts2.config.LegacyPropertiesConfigurationProvider.loadSettings(LegacyPropertiesConfigurationProvider.java:86)
	at org.apache.struts2.config.LegacyPropertiesConfigurationProvider.register(LegacyPropertiesConfigurationProvider.java:69)
	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:131)
	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
	at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)
{noformat}

Our suspicion is that the initialisation isn't thread-safe; we've not seen this failure on
older, single-processor / single-core machines.

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