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    org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection 问题处理

    1.首先看到的报错信息org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; 怀疑是项目配置的链接数据库的地址或者用户名, 密码错误导致,后仔细核查数据库ip ,端口号,数据库用户名,密码均未发现异常。 2.考虑到1中未排查出异常,故继续往下找,发现javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target,查询了一下错误信息的意义,发现这个应该是缺少认证证书的问题,但是连接数据库并不是通过https连接,怎么会触发证书认证的情况?可以错误日志也没有再提供其他的方向了,这个时候跟程序发现报了mysql的08001的错误码,查询得知代表的是数据库连接时区配置问题,再次检查时区配置,并按社区小伙伴提供的时区配置后问题仍然没有解决。 3.基于2中缺少证书的问题,给自己的tomcat安装了认证证书,但是问题仍然存在 4.问题再次回到1,检查数据库连接,发现原来的数据库连接有参数userSSL=true,这个参数是过去到现在一直存在的,查询参数意义发现如果这个参数开启,需要应用端和服务端同时配置证书,查看mysql服务端

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    java 数字信封_【Java密码学】使用Bouncy Castle生成数字签名、数字信封

    importjava.io.FileInputStream;importjava.io.InputStream;importjava.security.KeyStore;importjava.security.PrivateKey;importjava.security.Provider;importjava.security.Security;importjava.security.cert.Certificate;importjava.security.cert.CertificateFactory;importjava.security.cert.X509Certificate;importjava.util.ArrayList;importjava.util.Collection;importjava.util.Iterator;importjava.util.List;importorg.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;importorg.bouncycastle.cert.X509CertificateHolder;importorg.bouncycastle.cert.jcajce.JcaCertStore;importorg.bouncycastle.cms.CMSEnvelopedData;importorg.bouncycastle.cms.CMSEnvelopedDataGenerator;importorg.bouncycastle.cms.CMSProcessableByteArray;importorg.bouncycastle.cms.CMSSignedData;importorg.bouncycastle.cms.CMSSignedDataGenerator;importorg.bouncycastle.cms.CMSTypedData;importorg.bouncycastle.cms.RecipientInformation;importorg.bouncycastle.cms.RecipientInformationStore;importorg.bouncycastle.cms.SignerInformation;importorg.bouncycastle.cms.SignerInformationStore;importorg.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;importorg.bouncycastle.cms.jcajce.JcaSimpleSignerInfoVerifierBuilder;importorg.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;importorg.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;importorg.bouncycastle.cms.jcajce.JceKeyTransRecipientInfoGenerator;importorg.bouncycastle.jce.provider.BouncyCastleProvider;importorg.bouncycastle.operator.ContentSigner;importorg.bouncycastle.operator.jcajce.JcaContentSignerBuilder;importorg.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;importorg.bouncycastle.util.Store;importorg.bouncycastle.util.encoders.Base64;public classMessageUtil {private String ksType = “PKCS12”;/*** 生成数字签名

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