为什么我不能从 JDBC 连接池中 ping 我的数据库？
Why can't I ping my database from JDBC Connection Pool?
我一直在关注 this link 为 glassfish 服务器（位于 Debian 服务器计算机上）设置 MySql 连接池。
尝试 ping 数据库（位于 CentOS 服务器计算机上）时，我从 glassfish 服务器收到以下错误：
Ping Connection Pool failed for MySqlTrace. Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource Please check the server.log for more details.
我应该强调，我正在使用 workbench 客户端远程访问数据库（从我的 Windows 笔记本电脑），没有任何问题，并且使用相同的凭据（我检查了四次！） .
我也发布了 domain1/logs/server.log
[2015-12-09T09:39:58.825+0000] [glassfish 4.0] [SEVERE] [jdbc.exc_cnfe_ds] [javax.enterprise.resource.resourceadapter.com.sun.gjc.util] [tid: _ThreadID=101 _ThreadName=admin-listener(12)] [timeMillis: 1449653998825] [levelValue: 1000] [[
RAR5099 : Wrong class name or classpath for Datasource Object
java.lang.ClassNotFoundException: com.mysql.jdbc.jdbc2.optional.MysqlDataSource
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.sun.gjc.common.DataSourceObjectBuilder.getDataSourceObject(DataSourceObjectBuilder.java:285)
at com.sun.gjc.common.DataSourceObjectBuilder.constructDataSourceObject(DataSourceObjectBuilder.java:114)
at com.sun.gjc.spi.ManagedConnectionFactoryImpl.getDataSource(ManagedConnectionFactoryImpl.java:1300)
at com.sun.gjc.spi.DSManagedConnectionFactory.getDataSource(DSManagedConnectionFactory.java:163)
at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:102)
at com.sun.enterprise.connectors.service.ConnectorConnectionPoolAdminServiceImpl.getUnpooledConnection(ConnectorConnectionPoolAdminServiceImpl.java:696)
at com.sun.enterprise.connectors.service.ConnectorConnectionPoolAdminServiceImpl.testConnectionPool(ConnectorConnectionPoolAdminServiceImpl.java:425)
at com.sun.enterprise.connectors.ConnectorRuntime.pingConnectionPool(ConnectorRuntime.java:1162)
at org.glassfish.connectors.admin.cli.PingConnectionPool.execute(PingConnectionPool.java:143)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.run(CommandRunnerImpl.java:527)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.run(CommandRunnerImpl.java:523)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:360)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.execute(CommandRunnerImpl.java:522)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:546)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1423)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access00(CommandRunnerImpl.java:108)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1762)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1674)
at org.glassfish.admin.rest.utils.ResourceUtil.runCommand(ResourceUtil.java:235)
at org.glassfish.admin.rest.resources.TemplateExecCommand.executeCommandLegacyFormat(TemplateExecCommand.java:161)
at org.glassfish.admin.rest.resources.TemplateCommandGetResource.processGetLegacyFormat(TemplateCommandGetResource.java:75)
at sun.reflect.GeneratedMethodAccessor148.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.invoke(ResourceMethodInvocationHandlerFactory.java:81)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:125)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:152)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:91)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:346)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:341)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)
at org.glassfish.jersey.server.ServerRuntime.run(ServerRuntime.java:224)
at org.glassfish.jersey.internal.Errors.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:198)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:946)
at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:331)
at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:318)
at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:181)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.portunif.PUFilter.handleRead(PUFilter.java:231)
at org.glassfish.grizzly.filterchain.ExecutorResolver.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.portunif.PUFilter.handleRead(PUFilter.java:231)
at org.glassfish.grizzly.filterchain.ExecutorResolver.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access0(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:745)
]]
[2015-12-09T09:39:58.829+0000] [glassfish 4.0] [WARNING] [test.connection.pool.failed] [javax.enterprise.resource.resourceadapter.com.sun.enterprise.connectors.service] [tid: _ThreadID=101 _ThreadName=admin-listener(12)] [timeMillis: 14$
RAR8054: Exception while creating an unpooled [test] connection for pool [ MySqlTrace ], Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource]]
[2015-12-09T09:39:58.832+0000] [glassfish 4.0] [SEVERE] [] [org.glassfish.admingui] [tid: _ThreadID=102 _ThreadName=admin-listener(13)] [timeMillis: 1449653998832] [levelValue: 1000] [[
RestResponse.getResponse() gives FAILURE. endpoint = 'https://localhost:4848/management/domain/resources/ping-connection-pool.json'; attrs = '{id=MySqlTrace}']]
那我做错了什么？
编辑 1：
root@trace glassfish/lib# ls
appclient endorsed nadmin
appserv-rt.jar gf-client.jar nadmin.bat
asadmin install package-appclient.xml
client javaee.jar registration
deployment jndi-properties.jar schemas
dtds monitor
embedded mysql-connector-java-5.1.38
听起来您的 glassfish 服务器缺少 MySQL jdbc 驱动程序。下载 mysql_xxx.jar 到 glashfish_home/lib。
参见 https://dev.mysql.com/downloads/connector/j/
这个博客似乎给出了一个步骤，包括 jdbc 驱动程序 https://computingat40s.wordpress.com/how-to-setup-a-jdbc-connection-in-glassfish/
我一直在关注 this link 为 glassfish 服务器（位于 Debian 服务器计算机上）设置 MySql 连接池。
尝试 ping 数据库（位于 CentOS 服务器计算机上）时，我从 glassfish 服务器收到以下错误：
Ping Connection Pool failed for MySqlTrace. Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource Please check the server.log for more details.
我应该强调，我正在使用 workbench 客户端远程访问数据库（从我的 Windows 笔记本电脑），没有任何问题，并且使用相同的凭据（我检查了四次！） .
我也发布了 domain1/logs/server.log
[2015-12-09T09:39:58.825+0000] [glassfish 4.0] [SEVERE] [jdbc.exc_cnfe_ds] [javax.enterprise.resource.resourceadapter.com.sun.gjc.util] [tid: _ThreadID=101 _ThreadName=admin-listener(12)] [timeMillis: 1449653998825] [levelValue: 1000] [[
RAR5099 : Wrong class name or classpath for Datasource Object
java.lang.ClassNotFoundException: com.mysql.jdbc.jdbc2.optional.MysqlDataSource
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.sun.gjc.common.DataSourceObjectBuilder.getDataSourceObject(DataSourceObjectBuilder.java:285)
at com.sun.gjc.common.DataSourceObjectBuilder.constructDataSourceObject(DataSourceObjectBuilder.java:114)
at com.sun.gjc.spi.ManagedConnectionFactoryImpl.getDataSource(ManagedConnectionFactoryImpl.java:1300)
at com.sun.gjc.spi.DSManagedConnectionFactory.getDataSource(DSManagedConnectionFactory.java:163)
at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:102)
at com.sun.enterprise.connectors.service.ConnectorConnectionPoolAdminServiceImpl.getUnpooledConnection(ConnectorConnectionPoolAdminServiceImpl.java:696)
at com.sun.enterprise.connectors.service.ConnectorConnectionPoolAdminServiceImpl.testConnectionPool(ConnectorConnectionPoolAdminServiceImpl.java:425)
at com.sun.enterprise.connectors.ConnectorRuntime.pingConnectionPool(ConnectorRuntime.java:1162)
at org.glassfish.connectors.admin.cli.PingConnectionPool.execute(PingConnectionPool.java:143)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.run(CommandRunnerImpl.java:527)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.run(CommandRunnerImpl.java:523)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:360)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.execute(CommandRunnerImpl.java:522)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:546)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1423)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access00(CommandRunnerImpl.java:108)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1762)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1674)
at org.glassfish.admin.rest.utils.ResourceUtil.runCommand(ResourceUtil.java:235)
at org.glassfish.admin.rest.resources.TemplateExecCommand.executeCommandLegacyFormat(TemplateExecCommand.java:161)
at org.glassfish.admin.rest.resources.TemplateCommandGetResource.processGetLegacyFormat(TemplateCommandGetResource.java:75)
at sun.reflect.GeneratedMethodAccessor148.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.invoke(ResourceMethodInvocationHandlerFactory.java:81)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:125)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:152)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:91)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:346)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:341)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)
at org.glassfish.jersey.server.ServerRuntime.run(ServerRuntime.java:224)
at org.glassfish.jersey.internal.Errors.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:198)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:946)
at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:331)
at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:318)
at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:181)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.portunif.PUFilter.handleRead(PUFilter.java:231)
at org.glassfish.grizzly.filterchain.ExecutorResolver.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.portunif.PUFilter.handleRead(PUFilter.java:231)
at org.glassfish.grizzly.filterchain.ExecutorResolver.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access0(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:745)
]]
[2015-12-09T09:39:58.829+0000] [glassfish 4.0] [WARNING] [test.connection.pool.failed] [javax.enterprise.resource.resourceadapter.com.sun.enterprise.connectors.service] [tid: _ThreadID=101 _ThreadName=admin-listener(12)] [timeMillis: 14$
RAR8054: Exception while creating an unpooled [test] connection for pool [ MySqlTrace ], Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource]]
[2015-12-09T09:39:58.832+0000] [glassfish 4.0] [SEVERE] [] [org.glassfish.admingui] [tid: _ThreadID=102 _ThreadName=admin-listener(13)] [timeMillis: 1449653998832] [levelValue: 1000] [[
RestResponse.getResponse() gives FAILURE. endpoint = 'https://localhost:4848/management/domain/resources/ping-connection-pool.json'; attrs = '{id=MySqlTrace}']]
那我做错了什么？
编辑 1：
root@trace glassfish/lib# ls
appclient endorsed nadmin
appserv-rt.jar gf-client.jar nadmin.bat
asadmin install package-appclient.xml
client javaee.jar registration
deployment jndi-properties.jar schemas
dtds monitor
embedded mysql-connector-java-5.1.38
听起来您的 glassfish 服务器缺少 MySQL jdbc 驱动程序。下载 mysql_xxx.jar 到 glashfish_home/lib。
参见 https://dev.mysql.com/downloads/connector/j/
这个博客似乎给出了一个步骤，包括 jdbc 驱动程序 https://computingat40s.wordpress.com/how-to-setup-a-jdbc-connection-in-glassfish/