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  1. ,
    via Stack Overflow by carlos

    Set the mail.smtp.ssl.trust system property to an smtp host, like smtp.gmail.com.

  2. ,
    Expert tip

    If you're using wiremock, configure your code to accept wiremock self-signed certificate or create a keystore and certificate that are trusted by your HTTP client and configure wiremock to use that

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General SSLEngine problem
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target	at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:174)	at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:238)	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:318)	at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:217)	at sun.security.validator.Validator.validate(Validator.java:218)	at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:126)	at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:209)	at weblogic.security.SSL.jsseadapter.JaTrustManager.checkServerTrusted(JaTrustManager.java:125)	at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1198)	at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:136)	at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:593)	at com.sun.net.ssl.internal.ssl.Handshaker$1.run(Handshaker.java:533)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.net.ssl.internal.ssl.Handshaker$DelegatedTask.run(Handshaker.java:952)	at weblogic.socket.JSSEFilterImpl.doTasks(JSSEFilterImpl.java:186)	at weblogic.socket.JSSEFilterImpl.doHandshake(JSSEFilterImpl.java:95)	at weblogic.socket.JSSEFilterImpl.doHandshake(JSSEFilterImpl.java:64)	at weblogic.socket.JSSEFilterImpl.doHandshake(JSSEFilterImpl.java:59)	at weblogic.socket.JSSEFilterImpl.write(JSSEFilterImpl.java:390)	at weblogic.socket.JSSESocket$JSSEOutputStream.write(JSSESocket.java:78)	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)	at java.io.FilterOutputStream.flush(FilterOutputStream.java:123)	at weblogic.net.http.HttpURLConnection.writeRequests(HttpURLConnection.java:186)	at weblogic.net.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:280)	at cn.jpush.api.common.connection.NativeHttpClient._doRequest(NativeHttpClient.java:153)	at cn.jpush.api.common.connection.NativeHttpClient.doRequest(NativeHttpClient.java:93)	at cn.jpush.api.common.connection.NativeHttpClient.sendPost(NativeHttpClient.java:80)	at cn.jpush.api.push.PushClient.sendPush(PushClient.java:119)	at cn.jpush.api.JPushClient.sendMessageAll(JPushClient.java:362)	at cn.liucy.hello.HelloPush.doPost(HelloPush.java:40)	at cn.liucy.hello.HelloPush.doGet(HelloPush.java:29)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3732)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)