Using classical singleton pattern in J2EE environment is not a good idea. It's a pain in the ass when the "singleton" might not be singleton as you might expected. One such situation might be when there exists a hierarchy of classloaders in different J2EE modules where each might load their own "singleton". You might face problem also when in distributable web application.
If you need to ensure real "singleton" object in your environment, an entity bean would do the trick.
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subject: how can i restrict a servlet to create only one object