問題描述

• mysql版本：5.7.27
• jdk版本：1.8.0_201

tomcat日志中報(bào)錯(cuò)，顯示連接數(shù)據(jù)庫(kù)失敗，報(bào)錯(cuò)信息如下：

The last packet successfully received from the server was 152 milliseconds ago.  The last packet sent successfully to the server was 147 milliseconds ago.
    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:423)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:981)
    at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:164)
    ... 89 more
Caused by: javax.net.ssl.SSLException: Unsupported record version Unknown-0.0
    at sun.security.ssl.InputRecord.checkRecordVersion(InputRecord.java:552)
    at sun.security.ssl.InputRecord.readV3Record(InputRecord.java:565)
    at sun.security.ssl.InputRecord.read(InputRecord.java:529)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:975)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1395)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1379)
    at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:149)
    ... 89 more
Mon Dec 09 13:15:02 CST 2019 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
2019-12-09 13:15:02,494 ERROR [com.alibaba.druid.pool.DruidDataSource] - <create connection error, url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&zeroDateTimeBehavior=convertToNull&characterEncoding=UTF-8, errorCode 0, state 08S01>
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

解決方法

顯示配置數(shù)據(jù)庫(kù)連接地址useSSL=false，如

jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&zeroDateTimeBehavior=convertToNull&characterEncoding=UTF-8&useSSL=false

問題延伸

另一種比較麻煩的問題是geoserver也出現(xiàn)了類似連接mysql異常的問題，

報(bào)錯(cuò)信息如下：

ERROR [geoserver.ows] - 
java.lang.RuntimeException: Error getting FeatureType, this should never happen!
    at org.geoserver.wms.map.GetMapKvpRequestReader.checkStyle(GetMapKvpRequestReader.java:1218)
    at org.geoserver.wms.map.GetMapKvpRequestReader.read(GetMapKvpRequestReader.java:566)
    ... 100 more
Caused by: java.io.IOException
    at org.geoserver.catalog.ResourcePool.getDataStore(ResourcePool.java:632)
    at org.geoserver.catalog.ResourcePool.getCacheableFeatureType(ResourcePool.java:916)
    at org.geoserver.catalog.ResourcePool.tryGetFeatureType(ResourcePool.java:901)
    at org.geoserver.catalog.ResourcePool.getFeatureType(ResourcePool.java:893)
    at org.geoserver.catalog.ResourcePool.getFeatureType(ResourcePool.java:878)
    ... 111 more
Caused by: java.lang.RuntimeException: Unable to obtain connection: Cannot create PoolableConnectionFactory (Communications link failure

The last packet successfully received from the server was 2 milliseconds ago.  The last packet sent successfully to the server was 2 milliseconds ago.)
    at org.geotools.jdbc.JDBCDataStore.createConnection(JDBCDataStore.java:2186)
    at org.geotools.jdbc.JDBCDataStore.createTypeNames(JDBCDataStore.java:978)
    at org.geotools.data.store.ContentDataStore.getTypeNames(ContentDataStore.java:259)
    at org.vfny.geoserver.util.DataStoreUtils.getDataAccess(DataStoreUtils.java:88)
    at org.geoserver.catalog.ResourcePool.getDataStore(ResourcePool.java:591)
    ... 115 more
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet successfully received from the server was 2 milliseconds ago.  The last packet sent successfully to the server was 2 milliseconds ago.)
    at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
    at org.geotools.data.jdbc.datasource.AbstractManageableDataSource.getConnection(AbstractManageableDataSource.java:41)
    at org.geotools.jdbc.JDBCDataStore.createConnection(JDBCDataStore.java:2170)
    ... 119 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 2 milliseconds ago.  The last packet sent successfully to the server was 2 milliseconds ago.
    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:423)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)
    ... 143 more
Caused by: javax.net.ssl.SSLException: Unsupported record version Unknown-0.0
    at sun.security.ssl.InputRecord.checkRecordVersion(InputRecord.java:552)
    at sun.security.ssl.InputRecord.readV3Record(InputRecord.java:565)
    at sun.security.ssl.InputRecord.read(InputRecord.java:529)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:975)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1395)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1379)
    at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:186)
    ... 142 more

查找了geoserver中mysql插件的相關(guān)配置項(xiàng)，沒有找到設(shè)置SSL連接的屬性，在不修改geoserver源碼的情況下，只能修改mysql的ssl配置來修復(fù)了,

在mysql的配置文件my.cnf中加上一行：

# disable_ssl
skip_ssl

重啟MySQL：

service mysqld restart

再查看SSL的開啟狀態(tài)：

SHOW VARIABLES LIKE '%ssl%';

看到have_ssl的值為DISABLED，表示已關(guān)閉SSL。

總結(jié)

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。