我在spring-jersey1.8 restful web服务中使用c3p0进行连接池.在启动应用程序时,我收到以下错误:
[com.mchange.v2.c3p0.impl.C3P0ImplUtils] INFO - Failed to get local InetAddress for VMID. This is unlikely to matter. At all. We'll add some extra randomness java.net.UnknownHostException: Test: Test: unknown error at java.net.InetAddress.getLocalHost(InetAddress.java:1484) at com.mchange.v2.c3p0.impl.C3P0ImplUtils.generateVmId(C3P0ImplUtils.java:120) at com.mchange.v2.c3p0.impl.C3P0ImplUtils.(C3P0ImplUtils.java:98) at com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase. (PoolBackedDataSourceBase.java:227) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource. (AbstractPoolBackedDataSource.java:62) at com.mchange.v2.c3p0.ComboPooledDataSource. (ComboPooledDataSource.java:109) at com.mchange.v2.c3p0.ComboPooledDataSource. (ComboPooledDataSource.java:105) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:408) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:148) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1069) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1021) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.net.UnknownHostException: Test: unknown error at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:907) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1302) at java.net.InetAddress.getLocalHost(InetAddress.java:1479) ... 35 more
有谁知道这个错误是什么?
我的spring-datasource.xml文件有:
和pom.xml:
c3p0 c3p0 0.9.1.2
Jeremy S... 7
正如另一个帖子中所述(在Steve Waldman的评论中链接),解决方案是添加缺少的条目
java.net.UnknownHostException: Test: Test: unknown error
在这种情况下,它的测试中/etc/hosts
127.0.0.1 Test
Steve Waldma.. 6
因此,在一个合适的过度设计旨在防止碰撞万一许多C3P0数据源被序列化到分布式存储,C3P0试图给每个数据源一个全球唯一的"identityToken",这部分由前缀一个"VMID"来完成,意图(可能不足为奇)成为当前JVM的唯一标识符.
VMID部分由运行它的主机的Internet地址确定.所以c3p0调用java.net.InetAddress.getLocalHost()
来找到它.但是java.net.InetAddress.getLocalHost()
,由于安全原因或某些配置错误,可能会异常地调用失败.
所有这一切都是可怕的,可怕的矫枉过正.写完之后,我很害羞,但是我在理论上认为identityTokens可能会发生冲突,违反了一个identityToken应该映射到一个唯一池的不变量的可能性.所以,就是这样.
所以,我们找不到本地地址.哎呀.我们回过头来为我们将为您正在运行的VM生成的VMID添加一堆随机性,以减少在实践中已经无限的冲突可能性.然后我们继续前进.正如错误消息所说,"这不太重要.完全没问题."
如果您想让错误消失,您需要解决导致getLocalHost()
环境中调用失败的问题.但你真的可以忽略这一点.
(看起来你的环境是IPv6,它可能与它有关.我应该研究一下这个代码是否适合在VMID中包含IPv6地址.但是你的代码还远远不够. )