java.net.UnknownHostException：Test：Test：unknown error无法获取VMID的本地InetAddress

[weixin_38053367]

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.<clinit>(C3P0ImplUtils.java:98) at com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase.<init>(PoolBackedDataSourceBase.java:227) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.<init>(AbstractPoolBackedDataSource.java:62) at com.mchange.v2.c3p0.ComboPooledDataSource.<init>(ComboPooledDataSource.java:109) at com.mchange.v2.c3p0.ComboPooledDataSource.<init>(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： <!-- <context:property-placeholder location="/WEB-INF/spring.properties"></context:property-placeholder> --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close" p:driverClass="com.mysql.jdbc.Driver" p:jdbcUrl="jdbc:mysql://localhost:3306/test2" p:user="root" p:password="root" p:acquireIncrement="5" p:idleConnectionTestPeriod="60" p:maxPoolSize="100" p:maxStatements="50" p:minPoolSize="10" /> 和pom.xml： <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.2</version> </dependency>

[weixin_38056491]

因此,为了防止在不太可能发生的事件中将许多c3p0数据源序列化到分布式存储中的过度工程,c3p0尝试为每个DataSource提供全局唯一的“identityToken”,这部分地通过为“VMID”加前缀来实现,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()来查找.但是,由于安全原因或某些配置错误,对java.net.InetAddress.getLocalHost()的调用可能会异常失败. 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,您需要解决导致调用getLocalHost()的问题在您的环境中失败.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. )