PKIX path building failed:

1.最近发现java发送https请求时，会报一个证书异常现象（我的的是在本地windows系统上能够正常访问https路径，但在linux系统上不能访问，后来发现是由于本地%JAVA_HOME%/jre/lib/security和linux上的cacerts证书版本不一致，linux上的是2015-4-16的，比较落后了） -->报错所有信息以下 异常堆栈信息: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 sun.security.ssl.Alerts.getSSLException(Alerts.java:192) sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1937) sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302) sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296) sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1478) sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:212) sun.security.ssl.Handshaker.processLoop(Handshaker.java:979) sun.security.ssl.Handshaker.process_record(Handshaker.java:914) sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1050) sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1363) sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1391) sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1375) org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:395) org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:354) org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:134) org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353) org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380) org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184) org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184) org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107) org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)

2.根本缘由： Java在请求某些不受信任的https网站时会报：PKIX path building failed

3.解决办法： 1）、导入证书到本地证书库

2）、信任全部SSL证书

4.网上推荐使用 3.2，我的尝试了一下不行，这里讲解我的的解决方式

将最新的cacerts文件，替换到linux服务器上\jre\lib\security\目录下，替换老版本的证书