| Attributes Summary |
| type : CacheVariableKind | Only one option may be chosen.
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| id : String | The name of the variable.
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| method : String | String, only available if Type is "Request Attribute" or "Session Parameter".
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| required : boolean | hether this variables presence in the request/session is required to cache an invocation of this servlet.
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| dataId : String | The data id string combines with the value of this variable to form a group id; thus, cache entries that have the same value for this variable will all be part of the same group.
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| invalidate : String | Works just like data ids, except all members of the group generated will be removed from the cache.
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