本地服务运行ok，将本地代码打jar包放置linux上运行时，查询数据库报错如下，
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. ### The error may exist in URL [jar:file:/mydata/nginx/html/gulimall-file-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/mapper/UploadDao.xml] ### The error may involve com.dk.gulimall.file.dao.UploadDao.getRecords ### The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.mysql.cj.jdbc.exceptions.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.] with root cause javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate) at sun.security.ssl.HandshakeContext.(HandshakeContext.java:171) ~[na:1.8.0_301] at sun.security.ssl.ClientHandshakeContext. (ClientHandshakeContext.java:101) ~[na:1.8.0_301] at sun.security.ssl.TransportContext.kickstart(TransportContext.java:238) ~[na:1.8.0_301] at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:394) ~[na:1.8.0_301] at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:373) ~[na:1.8.0_301] at com.mysql.cj.protocol.ExportControlled.performTlsHandshake(ExportControlled.java:316) ~[mysql-connector-java-8.0.17.jar!/:8.0.17] at com.mysql.cj.protocol.StandardSocketFactory.performTlsHandshake(StandardSocketFactory.java:188) ~[mysql-connector-java-8.0.17.jar!/:8.0.17] at com.mysql.cj.protocol.a.NativeSocketConnection.performTlsHandshake(NativeSocketConnection.java:99) ~[mysql-connector-java-8.0.17.jar!/:8.0.17] at com.mysql.cj.protocol.a.NativeProtocol.negotiateSSLConnection(NativeProtocol.java:331) ~[mysql-connector-java-8.0.17.jar!/:8.0.17] at com.mysql.cj.protocol.a.NativeAuthenticationProvider.negotiateSSLConnection(NativeAuthenticationProvider.java:777) ~[mysql-connector-java-8.0.17.jar!/:8.0.17]
网上有说改本地打包环境的，也有说改linux的，经过实践，修改如下：
[root@iZ2ze9na41n2px47aknoqwZ security]# cd /usr/local/java/jdk1.8.0_301/jre/lib/security/ [root@iZ2ze9na41n2px47aknoqwZ security]# ls blacklist blacklisted.certs cacerts java.policy java.security javaws.policy policy public_suffix_list.dat trusted.libraries [root@iZ2ze9na41n2px47aknoqwZ security]# vim java.security
查找需要修改的地方，/jdk.tls.disabledAlgorithms=
yy p
把原始配置注释掉，删掉了SSLv3, TLSv1, TLSv1.1,
#jdk.tls.disabledAlgorithms=SSLv3, TLSv1, TLSv1.1, RC4, DES, MD5withRSA,
jdk.tls.disabledAlgorithms=RC4, DES, MD5withRSA,
DH keySize < 1024, EC keySize < 224, 3DES_EDE_CBC, anon, NULL,
include jdk.disabled.namedCurves
reboot重启下，或许不重启是可以的，我是重启的
请求ok，记录下该问题
