Declaring a private boolean causes build crash

I have a Java project that builds using Apache Ant to a website. This is not my code I am trying to learn and modify it. When I alter an object that implements Serializable, and is extended by other objects in a very small way, such as declaring a private boolean the server is unable to load the site.

ERROR - RequestCycle - Can't instantiate page using constructor public foo.bar.exportconfiguration.ExportConfigurationList()

Any ideas on where to look for answers? Looking for advice or ideas.

I know this is kind of vague, I'll check back and add more details if I can find them. Doing searches on another boolean variable to try to replicate any checking,开发者_StackOverflow社区 or verifying behavior that applies to it.

Edit: To clarify, I am only declaring the boolean:

private boolean fooBarFlag;

The boolean is never used.

Thanks

The boolean is never used.

This is normally just a warning, however, I don't know if the build script is set up to fail on warnings.

Try and add @SuppressWarnings ( "unused" ) to the declaration:

@SuppressWarnings ( "unused" )
private boolean fooBarFlag;