{"record":{"id":"f340ad6321012fa1","repo":"karatelabs/karate","slug":"error-releasing-driver-to-provider","errorCode":null,"errorMessage":"Error releasing driver to provider: {}","messagePattern":"Error releasing driver to provider: (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"karate-core/src/main/java/io/karatelabs/core/ScenarioRuntime.java","lineNumber":2396,"sourceCode":"        if (featureRuntime != null && featureRuntime.isSharedScope()\n                && featureRuntime.getCallerScenario() != null) {\n            featureRuntime.getCallerScenario().setDriverFromCallee(this);\n            driver = null;\n            return;\n        }\n\n        if (driverFromProvider) {\n            // Release back to provider\n            io.karatelabs.driver.DriverProvider provider = null;\n            if (featureRuntime != null && featureRuntime.getSuite() != null) {\n                provider = featureRuntime.getSuite().getDriverProvider();\n            }\n            if (provider != null) {\n                try {\n                    provider.release(this, driver);\n                    logger.debug(\"Released driver to provider for scenario: {}\", scenario.getName());\n                } catch (Exception e) {\n                    logger.warn(\"Error releasing driver to provider: {}\", e.getMessage());\n                }\n            }\n        } else {\n            // Close directly\n            try {\n                driver.quit();\n            } catch (Exception e) {\n                logger.warn(\"Error closing driver: {}\", e.getMessage());\n            }\n        }\n        driver = null;\n    }\n\n    /**\n     * Get the driver without initializing it.\n     * Returns null if driver has not been initialized.\n     * Used for checking if driver exists without side effects.\n     */","sourceCodeStart":2378,"sourceCodeEnd":2414,"githubUrl":"https://github.com/karatelabs/karate/blob/a22eb90246d958d15a47bf436693d0121ad2812d/karate-core/src/main/java/io/karatelabs/core/ScenarioRuntime.java#L2378-L2414","documentation":"When returning a driver to its pool provider at scenario teardown, Karate calls `provider.release(this, driver)`. If release throws, this warning is logged so the rest of teardown proceeds; the driver may be left in an inconsistent pool state.","triggerScenarios":"Pool provider's release logic throws — e.g. session cleanup RPC fails, driver process already dead, or provider bookkeeping bug during `ScenarioRuntime.tearDown`.","commonSituations":"Browser crashed mid-scenario so release fails; remote grid unreachable at teardown; provider implementation bugs in custom DriverProvider code.","solutions":["Inspect the exception message to see whether the browser or the provider failed","Restart/recycle the pool or grid node showing repeated release errors","Check browser and driver-process logs for crashes during the scenario","If using a custom provider, make release() idempotent and exception-safe"],"exampleFix":"// before\npublic void release(ScenarioRuntime rt, Driver d) { d.quit(); pool.put(d); }\n// after\npublic void release(ScenarioRuntime rt, Driver d) { try { d.quit(); } catch (Exception e) { log.warn(\"quit failed\", e); } pool.remove(d); }","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"// In custom providers, make release idempotent:\ntry { provider.release(this, driver); } catch (Exception e) { logger.warn(\"Error releasing driver to provider: {}\", e.getMessage()); }","preventionTips":["Write exception-safe, idempotent provider.release() implementations","Monitor grid/pool health; recycle failing nodes","Check browser stability if release errors repeat"],"tags":["karate","driver","driver-pool","teardown"],"backgroundTag":"resource-release-failed","analyzedSha":"a22eb90246d958d15a47bf436693d0121ad2812d","analyzedAt":"2026-09-12T09:01:00.220Z","contentChangedAt":"2026-09-12T09:01:00.220Z","schemaVersion":2},"datasetVersion":"2026-09-19T12:17:13.211Z"}