# Unfreezing session variables upon unparking

When parking an application, all of its session variables and components obtain the status **FROZEN**, which means we are unable to update their values. However, when unparking an application, some variables and components change their status to **NOT\_FROZEN\_BUT\_CHILDREN\_NEED\_ANALYZE** , which makes it possible to update their values.

This happens in the visitor **UnfreezeUnparkedChildrensValuesVisitor**, which “unfreezes” the components in the application and the session variables that depend on them. So if we have a problem updating the value of a session variable after unparking, it is enough, for example, to create a technical field, set up a listener and **DATA SOURCE FROM ANOTHER FIELD** on this session variable, in this way we will force its status to change from **FROZEN** to **NOT\_FROZEN\_BUT\_CHILDREN\_NEED\_ANALYZE.**


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