| service calls repository |
| repository loads user |
| method returns result |
| method throws exception |
| controller receives request |
| controller returns response |
| service validates data |
| repository saves entity |
| database stores records |
| transaction starts |
| transaction commits |
| transaction rolls back |
| cache stores value |
| cache returns value |
| consumer reads message |
| producer sends message |
| application starts |
| thread executes task |
| method accepts parameter |
| constructor creates object |
| interface defines behavior |
| class implements interface |
| class extends parent class |
| stream filters elements |
| stream maps objects |
| collection contains elements |
| list keeps order |
| set stores unique values |
| map stores key value pairs |
| exception propagates to caller |
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