我在将tomcat docker容器连接到docker mysql容器时遇到问题。
tomcat所说的错误是：
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
如果我进入容器tomcat，那么容器之间就会建立连接，我可以通过
连接到mysql容器mysql -u user -h mysql_container -p
该应用程序配置有休眠和库com.mchange.v2.c3p0.ComboPooledDataSource用于构建连接池
我证明与其他库连接池相同，并且错误相同。
这里是我的配置文件
conf / catalina / localhost / resource.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<Context cookies="false">
<ResourceLink name="jdbc/DB" global="jdbc/DB" type="javax.sql.DataSource"/>
</Context>
conf / server.xml
<GlobalNamingResources>
<Resource auth="Container"
driverClass="com.mysql.jdbc.Driver"
maxPoolSize="3"
minPoolSize="3"
acquireIncrement="2"
name="jdbc/DB"
user="user"
password="password"
factory="org.apache.naming.factory.BeanFactory"
type="com.mchange.v2.c3p0.ComboPooledDataSource"
jdbcUrl="jdbc:mysql://mysql:3306/db?autoReconnect=true"/>
</GlobalNamingResources>
撰写文件
mysqldb:
container_name: mysql
image: mysql:v1
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: password
MYSQL_DATABASE: db
MYSQL_USER: user
MYSQL_PASSWORD: user
MYSQL_ROOT_HOST: 192.168.20.0/255.255.255.0
networks:
app_net:
ipv4_address: 192.168.20.20
volumes:
- mysql-data:/var/lib/mysql/
- mysql-data1:/etc/mysql/
xml01:
container_name: xml01
expose:
- "8009"
ports:
- "8080:8080"
image: tomcat:v1
#depends_on:
# - mysqldb
networks:
app_net:
ipv4_address: 192.168.20.10
volumes:
- tomcat_data:/usr/local/tomcat/
links:
- mysqldb
volumes:
proxy-data:
mysql-data:
mysql-data1:
tomcat_data:
networks:
app_net:
driver: bridge
ipam:
driver: default
config:
-
subnet: 192.168.20.0/24
错误
21-Aug-2018 15:47:23.727 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version: Apache Tomcat/8.5.28
21-Aug-2018 15:47:23.729 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server built: Feb 6 2018 23:10:25 UTC
21-Aug-2018 15:47:23.729 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server number: 8.5.28.0
21-Aug-2018 15:47:23.729 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name: Linux
21-Aug-2018 15:47:23.730 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version: 4.15.0-24-generic
21-Aug-2018 15:47:23.730 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture: amd64
21-Aug-2018 15:47:23.730 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Java Home: /usr/lib/jvm/java-8-openjdk-amd64/jre
21-Aug-2018 15:47:23.730 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version: 1.8.0_181-8u181-b13-1~deb9u1-b13
21-Aug-2018 15:47:23.730 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor: Oracle Corporation
21-Aug-2018 15:47:23.730 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE: /usr/local/tomcat
21-Aug-2018 15:47:23.730 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME: /usr/local/tomcat
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dignore.endorsed.dirs=
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=/usr/local/tomcat
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=/usr/local/tomcat
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=/usr/local/tomcat/temp
21-Aug-2018 15:47:23.731 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent Loaded APR based Apache Tomcat Native library [1.2.17] using APR version [1.5.2].
21-Aug-2018 15:47:23.732 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
21-Aug-2018 15:47:23.732 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
21-Aug-2018 15:47:23.735 INFO [main] org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL successfully initialized [OpenSSL 1.1.0f 25 May 2017]
21-Aug-2018 15:47:23.819 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8080"]
21-Aug-2018 15:47:23.832 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
21-Aug-2018 15:47:23.840 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
21-Aug-2018 15:47:23.841 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
21-Aug-2018 15:47:23.842 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 499 ms
21-Aug-2018 15:47:23.915 INFO [MLog-Init-Reporter] com.mchange.v2.log.MLog. MLog clients using java 1.4+ standard logging.
21-Aug-2018 15:47:23.975 INFO [main] com.mchange.v2.c3p0.C3P0Registry. Initializing c3p0-0.9.5.2 [built 08-December-2015 22:06:04 -0800; debug? true; trace: 10]
21-Aug-2018 15:47:24.041 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
21-Aug-2018 15:47:24.042 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.28
21-Aug-2018 15:47:24.057 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDescriptor Deploying configuration descriptor [/usr/local/tomcat/conf/Catalina/localhost/resclick.xml]
21-Aug-2018 15:47:28.622 INFO [localhost-startStop-1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
21-Aug-2018 15:47:29.220 INFO [localhost-startStop-1] com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource. Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 2, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> 1hge4ui9xpun2k5rhr78s|53f65459, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false, identityToken -> 1hge4ui9xpun2k5rhr78s|53f65459, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql://db:3306/resclickdb?autoReconnect=true, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 3, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]
21-Aug-2018 15:50:03.599 WARNING [C3P0PooledConnectionPoolManager[identityToken->1hge4ui9xpun2k5rhr78s|53f65459]-HelperThread-#0] com.mchange.v2.resourcepool.BasicResourcePool. com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@7eedbf30 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
at sun.reflect.GeneratedConstructorAccessor15.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.Util.getInstance(Util.java:383)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1023)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2407)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2328)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:832)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:417)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.GeneratedConstructorAccessor9.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1137)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:356)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2504)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2346)
... 18 more
Caused by: java.net.UnknownHostException: db
at java.net.InetAddress.getAllByName0(InetAddress.java:1280)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:250)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:306)
... 20 more
21-Aug-2018 15:50:03.599 WARNING [C3P0PooledConnectionPoolManager[identityToken->1hge4ui9xpun2k5rhr78s|53f65459]-HelperThread-#2] com.mchange.v2.resourcepool.BasicResourcePool. com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@560ec1f4 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
at sun.reflect.GeneratedConstructorAccessor15.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.Util.getInstance(Util.java:383)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1023)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2407)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2328)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:832)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:417)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.GeneratedConstructorAccessor9.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1137)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:356)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2504)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2346)
... 18 more
Caused by: java.net.UnknownHostException: db
at java.net.InetAddress.getAllByName0(InetAddress.java:1280)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:250)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:306)
... 20 more
21-Aug-2018 15:50:03.603 WARNING [C3P0PooledConnectionPoolManager[identityToken->1hge4ui9xpun2k5rhr78s|53f65459]-HelperThread-#0] com.mchange.v2.resourcepool.BasicResourcePool. Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@28a3708d is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
21-Aug-2018 15:50:03.606 WARNING [C3P0PooledConnectionPoolManager[identityToken->1hge4ui9xpun2k5rhr78s|53f65459]-HelperThread-#2] com.mchange.v2.resourcepool.BasicResourcePool. Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@28a3708d is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
21-Aug-2018 15:50:03.608 WARNING [C3P0PooledConnectionPoolManager[identityToken->1hge4ui9xpun2k5rhr78s|53f65459]-HelperThread-#1] com.mchange.v2.resourcepool.BasicResourcePool. com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@62146d03 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
at sun.reflect.GeneratedConstructorAccessor15.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.Util.getInstance(Util.java:383)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1023)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2407)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2328)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:832)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:417)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.GeneratedConstructorAccessor9.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1137)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:356)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2504)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2346)
... 18 more
Caused by: java.net.UnknownHostException: db
at java.net.InetAddress.getAllByName0(InetAddress.java:1280)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:250)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:306)
... 20 more
21-Aug-2018 15:50:03.613 WARNING [C3P0PooledConnectionPoolManager[identityToken->1hge4ui9xpun2k5rhr78s|53f65459]-HelperThread-#1] com.mchange.v2.resourcepool.BasicResourcePool. Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@28a3708d is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
谢谢
最好的问候
答案 0 :(得分：0)
在tomcat中，请使用mysql-container的容器名称而不是IP，还要使用内部端口而不是外部端口
答案 1 :(得分：0)
我解决了在配置tomcat撰写文件中进行此修改的问题。
methods: {
getPostMeta: async function () {
let promise = new Promise((resolve, reject) => {
setTimeout(() => {
const result = {
title: 'Promise Title Test',
meta: [
{ charset: 'utf-8' },
{ name: 'viewport', content: 'width=device-width, initial-scale=1' },
{ name: 'keywords', content: 'keyword 1, keyword 2'},
{ hid: 'description', name: 'description', content: 'PROMISE. This is the generic promise descr.'}
]
}
resolve(result)
}, 1000)
})
let result = await promise
console.log('result: ', result)
return result
}
},
head () {
return this.getPostMeta()
}
https://github.com/moby/moby/issues/25562
谢谢。