====== Handlers ======
Handlers are registered in the application model. The platform runs the method which is annotated with ''@Execute''. Only one method should be annotated with ''@Execute''.

The run method should **not** be annotated with ''@Inject'' because on every action which requires Inject all methods annotated with ''@Inject'' will be executed, even the run method if it is annotated with ''@Inject''.

===== Field Injection =====
Handlers should not use field injection (''@Inject'' on fields) because handlers are created as singletons very early in the application lifecycle and fields cannot be reinjected., see http://wiki.eclipse.org/Eclipse4/RCP/FAQ#Why_aren.27t_my_handler_fields_being_re-injected.3F

<note tip>But it is safe to use method injection on the execution method of the handler.</note>

{{tag>e4}}