在使用普通模式发送消息时，只设置了corpid、corpsecret、agentid三个参数：
WxCpInMemoryConfigStorage config = new WxCpInMemoryConfigStorage();
config.setCorpId("..."); // 设置微信企业号的appid
config.setCorpSecret("..."); // 设置微信企业号的app corpSecret
config.setAgentId("0"); // 设置微信企业号应用ID
报错：
Exception in thread "main" java.lang.RuntimeException: 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
at me.chanjar.weixin.cp.api.WxCpServiceImpl.getAccessToken(WxCpServiceImpl.java:128)