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                # 23.1 啟動失敗 ### 23.1 啟動失敗 如果應用啟動失敗,注冊的`FailureAnalyzers`就有機會提供一個特定的錯誤信息,及具體的解決該問題的動作。例如,如果在`8080`端口啟動一個web應用,而該端口已被占用,那你應該可以看到類似如下的內容: ``` *************************** APPLICATION FAILED TO START *************************** Description: Embedded servlet container failed to start. Port 8080 was already in use. Action: Identify and stop the process that's listening on port 8080 or configure this application to listen on another port. ``` **注** Spring Boot提供很多的`FailureAnalyzer`實現,你[自己實現](http://docs.spring.io/spring-boot/docs/1.4.1.RELEASE/reference/htmlsingle/#howto-failure-analyzer)也很容易。 如果沒有可用于處理該異常的失敗分析器(failure analyzers),你需要展示完整的auto-configuration報告以便更好的查看出問題的地方,因此你需要啟用`org.springframework.boot.autoconfigure.logging.AutoConfigurationReportLoggingInitializer`的[debug](http://docs.spring.io/spring-boot/docs/1.4.1.RELEASE/reference/htmlsingle/#boot-features-external-config)屬性,或開啟[DEBUG日志級別](http://docs.spring.io/spring-boot/docs/1.4.1.RELEASE/reference/htmlsingle/#boot-features-custom-log-levels)。 例如,使用`java -jar`運行應用時,你可以通過如下命令啟用`debug`屬性: ``` $ java -jar myproject-0.0.1-SNAPSHOT.jar --debug ```
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