Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance ...

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本文详细解析了在Tomcat部署过程中遇到的ClassNotFoundException错误，特别是针对org.jboss.netty.util.internal.ByteBufferUtil加载失败的问题，并提供了解决方案，即重新部署Tomcat以避免线程冲突。

Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [org.jboss.netty.util.internal.ByteBufferUtil].

没啥好慌的，重新部署Tomcat就可以了。当前线程和Tomcat已有线程冲突了，Tomcat不要频繁的去操作就好了。

非法访问：此Web应用程序实例已停止。无法加载
梦凝哲雪
03-20 5940
信息: 非法访问：此Web应用程序实例已停止。无法加载[]。为了调试以及终止导致非法访问的线程，将抛出以下堆栈跟踪。 java.lang.IllegalStateException: 非法访问：此Web应用程序实例已停止。无法加载[]。为了调试以及终止导致非法访问的线程，将抛出以下堆栈跟踪。 at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:
Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been
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Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [org.jboss.netty.util.internal.ByteBufferUtil]. 原因: Tomcat已经启动,出现了线程冲突,这可能是你之前的操作里涵盖了Tomcat的相关操作 方案: cd /opt/tomcat/bin ./sh
Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been ...
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Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [org.jboss.netty.util.internal.ByteBufferUtil]. The following stac...
此Web应用程序实例已停止。无法加载
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1.1 现象 关闭tomcat时，报无法加载类的错误。 非法访问：此Web应用程序实例已停止。无法加载[io.netty.util.concurrent.DefaultPromise$1]java.lang.NoClassDefFoundError 1.2 线程关闭 导致无法加载加载的原因就是tomcat已经关闭了类加载器，但是部分线程还在运行。 简单理解就是tomcat关闭的线程和用户其他线程没有串行执行。 比如： 把springboot+netty项目发布到外置tomcat，netty的关
蛋疼的Caused by: java.lang.ClassNotFoundException
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开发中最长遇到的错误提示，遇到这种错误提示，一般可能有： 1.忘记在AndroidManifest中配置，这个很好解决，在里面配置一下就行了。 2.更常见的问题是在引入外包时出现这个问题，怎么解决呢？右键工程Bulid path--Configure Build path :   在你需要导入的包前打钩，然后选OK，然后重启eclipse，这个问题就不会出现了吧。 喜欢的朋友可以关注
Exception in thread "idle_connection_reaper" java.lang.NoClassDefFoundError: com/aliyun/oss/common/utils/LogUtils at com.aliyun.oss.common.comm.IdleConnectionReaper.run(IdleConnectionReaper.java:97) Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [com.aliyun.oss.common.utils.LogUtils]. 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.checkStateForClassLoading(WebappClassLoaderBase.java:1374) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1224) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1185) ... 1 more Caused by: java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [com.aliyun.oss.common.utils.LogUtils]. 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:1384) at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1372) ... 3 more
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`java.lang.NoClassDefFoundError: com/aliyun/oss/common/utils/LogUtils` 是一个典型的运行时类加载错误，表明在运行时无法找到编译时可用的类 `LogUtils`。这种错误通常与类路径配置、依赖版本冲突或类加载器行为...
java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [com.aliyun.oss.common.utils.LogUtils]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
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在 Java Web 应用中遇到 `java.lang.ClassNotFoundException: Illegal access` 错误通常表明应用在尝试加载某个类时遇到了问题，而该类的访问权限或类路径配置存在异常。此类错误通常与类加载机制、类路径冲突或依赖...
ava.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [org.apache.commons.pool.impl.GenericObjectPool$ObjectTimestampPair]. 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:1372) at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1360) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1219) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180) at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:772) at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95) at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540) at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:73) at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:52) at com.saint.pub.database.BaseDaoImpl.getListBySql(BaseDaoImpl.java:113) at com.saint.systemManager.dao.imp.CommMessageSendDaoImpl.selectListCommMessageSendBySql(CommMessageSendDaoImpl.java:57) at com.saint.systemManager.services.imp.CommMessageSendServiceImpl.selectListCommMessageSendBySql(CommMessageSendServiceImpl.java:155) at com.saint.systemManager.ctrl.HeartBeatAction.roundLookWaitMessage(HeartBeatAction.java:21) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:273) at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:264) at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86) at org.quartz.core.JobRunShell.run(JobRunShell.java:202) at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529) 八月 29, 2025 3:31:42 下午 org.apache.catalina.loader.WebappClassLoaderBase checkStateForResourceLoading 信息: Illegal access: this web application instance has been stopped already. Could not load [org.apache.log4j.spi.ThrowableInformation]. 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 [org.apache.log4j.spi.ThrowableInformation]. 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:1372) at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1360) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1219) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180) at org.apache.log4j.spi.LoggingEvent.<init>(LoggingEvent.java:154) at org.apache.log4j.Category.forcedLog(Category.java:388) at org.apache.log4j.Category.log(Category.java:853) at org.apache.commons.logging.impl.Log4JLogger.error(Log4JLogger.java:251) at org.quartz.core.JobRunShell.run(JobRunShell.java:211) at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529) Exception in thread "scheduler_Worker-1" java.lang.NoClassDefFoundError: org/apache/log4j/spi/ThrowableInformation at org.apache.log4j.spi.LoggingEvent.<init>(LoggingEvent.java:154) at org.apache.log4j.Category.forcedLog(Category.java:388) at org.apache.log4j.Category.log(Category.java:853) at org.apache.commons.logging.impl.Log4JLogger.error(Log4JLogger.java:251) at org.quartz.core.JobRunShell.run(JobRunShell.java:211) at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529) Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [org.apache.log4j.spi.ThrowableInformation]. 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.checkStateForClassLoading(WebappClassLoaderBase.java:1362) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1219) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180) ... 6 more Caused by: java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [org.apache.log4j.spi.ThrowableInformation]. 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:1372) at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1360) ... 8 more
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`java.lang.IllegalStateException`（Web应用实例已停止，无法加载类）通常意味着在Web应用停止后尝试进行类加载操作，而`java.lang.NoClassDefFoundError`表示Java虚拟机在编译时能找到类，但在运行时找不到该类的...
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)
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- **依赖缺失或冲突**：检查WEB-INF/lib目录下是否有所有必需的JAR包，特别注意JDBC驱动版本是否匹配。使用`mvn dependency:tree`（若为Maven项目）排查冲突。 - **配置文件错误**：检查应用配置文件（如`web.xml`、...
java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [ch.qos.logback.core.status.WarnStatus]. 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:1353) at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1341) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1206) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167) at ch.qos.logback.classic.LoggerContext.noAppenderDefinedWarning(LoggerContext.java:186) at ch.qos.logback.classic.Logger.callAppenders(Logger.java:264) at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:421) at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:383) at ch.qos.logback.classic.Logger.debug(Logger.java:482) at com.mongodb.diagnostics.logging.SLF4JLogger.debug(SLF4JLogger.java:56) at com.mongodb.internal.connection.InternalStreamConnection.close(InternalStreamConnection.java:301) at com.mongodb.internal.connection.DefaultServerMonitor$RoundTripTimeRunnable.run(DefaultServerMonitor.java:411)
06-14
我们正在处理一个JavaWeb应用中的异常问题，具体是`java.lang.IllegalStateException:Illegalaccess:webapplicationinstancestoppedalready`，通常发生在Tomcat容器中，同时可能伴随Logback和ClassLoader相关的异常...
Caused by: java.lang.ClassNotFoundException常见异常解决方法！
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