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ComponentDependencyImpl sessionManagerDependency = new ComponentDependencyImpl();
sessionManagerDependency.setServiceName(SessionManager.class.getName());
sessionManagerDependency.setRequired(true);
myComponentDefinition.setDependencies(new ComponentDependency[] {
sessionManagerDependency});

The property setDependencies is usually set for the component with an empty array. Be sure to remove the empty occurrence of that property.