【发布时间】：2015-02-12 10:51:21
【问题描述】：
我正在开发 Grails 应用程序，目标是 Grails Mongo 插件。 当我使用 run-app 命令在本地运行应用程序时，一切正常，应用程序打开了 2 个与 Mongo 实例的连接。
但是当我将应用程序打包成war文件并将其部署到远程Tomcat服务器时，启动应用程序的行为变得很奇怪。
这是启动日志：
??? 12, 2015 1:15:59 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/myapp] registered the JDBC driver [org.h2.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
??? 12, 2015 1:15:59 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/myapp] appears to have started a thread named [cluster-1-myapp.server:27017] but has failed to stop it. This is very likely to create a memory leak.
??? 12, 2015 1:15:59 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/myapp] appears to have started a thread named [MongoCleaner1332131781] but has failed to stop it. This is very likely to create a memory leak.
??? 12, 2015 1:15:59 PM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deployment of web application archive /data/tomcat3/webapps/myapp.war has finished in 40,759 ms
??? 12, 2015 1:16:04 PM org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already. Could not load org.bson.io.PoolOutputBuffer. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1612)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at org.bson.BasicBSONDecoder.<init>(BasicBSONDecoder.java:599)
at com.mongodb.DefaultDBDecoder.<init>(DefaultDBDecoder.java:44)
at com.mongodb.DefaultDBDecoder$DefaultFactory.create(DefaultDBDecoder.java:33)
at com.mongodb.DBPort.<init>(DBPort.java:90)
at com.mongodb.ServerMonitor$ServerMonitorRunnable.run(ServerMonitor.java:87)
at java.lang.Thread.run(Thread.java:745)
??? 12, 2015 1:16:29 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
??? 12, 2015 1:16:29 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/app] startup failed due to previous errors
因此，在启动应用程序期间，尝试在单独的 Java 线程中获取 MongoConnection 并失败但不会关闭该线程。
所以每隔约 5 秒，应用程序会打开新的连接，而 MongoDB 服务器会消耗所有可用的连接：
> db.serverStatus().connections
{ "current" : 6, "available" : 813, "totalCreated" : NumberLong(800) }
> db.serverStatus().connections
{ "current" : 45, "available" : 774, "totalCreated" : NumberLong(839) }
Mongo DB Server 可从该 Tomcat 服务器实例获得，我可以连接到它并检索数据。
stacktrace.log 还包含下一个错误：
Caused by: com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting for a server that matches AnyServerSelector{}. Client view of cluster state is {type=Unknown, servers=[{address=mongodb.host:27017, type=Unknown, state=Connecting}]
at com.mongodb.BaseCluster.getServer(BaseCluster.java:82)
at com.mongodb.DBTCPConnector.getServer(DBTCPConnector.java:650)
at com.mongodb.DBTCPConnector.access$300(DBTCPConnector.java:39)
at com.mongodb.DBTCPConnector$MyPort.getConnection(DBTCPConnector.java:499)
at com.mongodb.DBTCPConnector$MyPort.get(DBTCPConnector.java:447)
at com.mongodb.DBTCPConnector.authenticate(DBTCPConnector.java:620)
at com.mongodb.DBApiLayer.doAuthenticate(DBApiLayer.java:195)
at com.mongodb.DB.authenticateCommandHelper(DB.java:765)
at com.mongodb.DB.authenticate(DB.java:721)
at org.grails.datastore.gorm.mongo.bean.factory.GMongoFactoryBean.afterPropertiesSet(GMongoFactoryBean.java:149)
... 5 more
有人遇到过同样的问题吗？
谢谢！
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标签： mongodb grails tomcat7 grails-orm