[CAMEL-16804] NullPointerException when using try-with-resources and MainConfigurationProperties

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.11.0
• Fix Version/s: 3.11.1, 3.12.0
• Component/s: camel-main
• Estimated Complexity: Unknown
• Assignee: Zoran Regvart
• Reporter: Zoran Regvart
• Created: 15/Jul/21 09:05
• Updated: 15/Jul/21 11:54
• Resolved: 15/Jul/21 11:54

Description

When using try-with-resources with MainConfigurationProperties, MainConfigurationProperties::close might be invoked twice leading to NullPointerException on shutdown:

...
Caused by: java.lang.NullPointerException
	at all//org.apache.camel.main.MainConfigurationProperties.close(MainConfigurationProperties.java:88)
	at all//io.github.zregvart.dbzcamel.dbtodb.App.main(App.java:26)
	... 4 more

I.e. the Camel's shutdown will invoke MainConfigurationProperties::close, but also the try-with-resources bit if used like:

try (MainConfigurationProperties configure = main.configure()) {
    configure.addRoutesBuilder(Route.class);
    main.run(args);
} catch (final Exception e) {
    throw new RuntimeException(e);
}