程序连接oracle数据库问题Cannot create PoolableConnectionFactory ...

报错：

[ERROR] 2018-08-11 11:09:19 com.ipi.caee.InitServlet - 初始化数据加载异常
org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Io 异常: Got minus one from a read call)
Caused by: 
org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Io 异常: Got minus one from a read call)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1225)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:200)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:350)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:262)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:101)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:631)
at com.ipi.caee.app.service.system.ConfigManagerService$$EnhancerByCGLIB$$6556db91.loadSystemParameterList(<generated>)
at com.ipi.caee.base.quartz.SystemQuartz.loadConfigManager(SystemQuartz.java:48)
at com.ipi.caee.base.common.ConfigManager.loadConfigManager(ConfigManager.java:46)
at com.ipi.caee.base.common.InitLoad.init(InitLoad.java:53)
at com.ipi.caee.InitServlet.init(InitServlet.java:42)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1266)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1185)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5015)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5302)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:895)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:871)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1099)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1621)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.sql.SQLException: Io 异常: Got minus one from a read call
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:439)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:294)
at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1247)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1221)
... 28 more

问题可能原因：

1:数据库连接满了，扩大数据库连接池

2:所登录的机子IP不在sqlnet.ora内，加入后重启listerner即可

3:数据库负载均衡时，指定了(SERVER=DEDICATED)，去除这个即可

问题检查：

1、查看当前连接和最高允许多少连接；

select count(*) from v$process ;    --当前的数据库连接数

 select value from v$parameter where name ='processes';  --数据库允许的最大连接数

 alter system set processes = 300 scope = spfile;  --修改最大连接数:

我的当前连接60，最高150，故不是因为连接数限制导致（ps：修改了连接数得重启）

2、你看看服务端sqlnet.ora 文件，有没有添加IP限制，监听日志里面有没有错误信息。

查看到sqlnet.ora中没有添加客户端，故将客户端ip添加

添加后并没有实时生效，必须执行lsnrctl reload，问题解决。（rac环境需要每个节点的文件都修改）