Create thread dump for JAVA Stack WAS

本文介绍如何为J2EE Engine 6.40/7.0创建完整的线程转储,这对于诊断应用服务器中出现的问题非常有用。
710154 How to create a thread dump for the J2EE Engine 6.40/7.0
599539 J2EE Engine: How to create a full thread dump
08-Sep-2025 13:35:44.453 SEVERE [http-nio-8080-exec-15] org.apache.catalina.core.StandardContext.startInternal Context [/mesFERROTEC] startup failed due to previous errors 08-Sep-2025 13:35:44.976 WARNING [http-nio-8080-exec-15] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [mesFERROTEC] registered the JDBC driver [com.mysql.cj.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 08-Sep-2025 13:35:44.978 WARNING [http-nio-8080-exec-15] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [mesFERROTEC] appears to have started a thread named [mysql-cj-abandoned-connection-cleanup] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: java.lang.Object.wait(Native Method) java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144) com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:85) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) java.lang.Thread.run(Thread.java:748) 08-Sep-2025 13:35:44.979 WARNING [http-nio-8080-exec-15] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [mesFERROTEC] appears to have started a thread named [pool-21-thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078) java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093) java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) java.lang.Thread.run(Thread.java:748) 08-Sep-2025 13:35:44.986 INFO [http-nio-8080-exec-15] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive [/usr/local/tomcat/webapps/mesFERROTEC.war] has finished in [109,199] ms 08-Sep-2025 13:35:47.008 INFO [mysql-cj-abandoned-connection-cleanup] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1378) at org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:1030) at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.checkThreadContextClassLoader(AbandonedConnectionCleanupThread.java:117) at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:84) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)
09-09
Delphi 12.3 作为一款面向 Windows 平台的集成开发环境,由 Embarcadero Technologies 负责其持续演进。该环境以 Object Pascal 语言为核心,并依托 Visual Component Library(VCL)框架,广泛应用于各类桌面软件、数据库系统及企业级解决方案的开发。在此生态中,Excel4Delphi 作为一个重要的社区开源项目,致力于搭建 Delphi 与 Microsoft Excel 之间的高效桥梁,使开发者能够在自研程序中直接调用 Excel 的文档处理、工作表管理、单元格操作及宏执行等功能。 该项目以库文件与组件包的形式提供,开发者将其集成至 Delphi 工程后,即可通过封装良好的接口实现对 Excel 的编程控制。具体功能涵盖创建与编辑工作簿、格式化单元格、批量导入导出数据,乃至执行内置公式与宏指令等高级操作。这一机制显著降低了在财务分析、报表自动生成、数据整理等场景中实现 Excel 功能集成的技术门槛,使开发者无需深入掌握 COM 编程或 Excel 底层 API 即可完成复杂任务。 使用 Excel4Delphi 需具备基础的 Delphi 编程知识,并对 Excel 对象模型有一定理解。实践中需注意不同 Excel 版本间的兼容性,并严格遵循项目文档进行环境配置与依赖部署。此外,操作过程中应遵循文件访问的最佳实践,例如确保目标文件未被独占锁定,并实施完整的异常处理机制,以防数据损毁或程序意外中断。 该项目的持续维护依赖于 Delphi 开发者社区的集体贡献,通过定期更新以适配新版开发环境与 Office 套件,并修复已发现的问题。对于需要深度融合 Excel 功能的 Delphi 应用而言,Excel4Delphi 提供了经过充分测试的可靠代码基础,使开发团队能更专注于业务逻辑与用户体验的优化,从而提升整体开发效率与软件质量。 资源来源于网络分享,仅用于学习交流使用,请勿用于商业,如有侵权请联系我删除!
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