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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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javax.net.ssl.SSLHandshakeException: 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:196)	at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)	at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)	at sun.security.validator.Validator.validate(Validator.java:260)	at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:326)	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:283)	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:138)	at io.netty.handler.ssl.ReferenceCountedOpenSslClientContext$ExtendedTrustManagerVerifyCallback.verify(ReferenceCountedOpenSslClientContext.java:219)	at io.netty.handler.ssl.ReferenceCountedOpenSslContext$AbstractCertificateVerifier.verify(ReferenceCountedOpenSslContext.java:588)	at org.apache.tomcat.jni.SSL.readFromSSL(Native Method)	at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.readPlaintextData(ReferenceCountedOpenSslEngine.java:456)	at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:823)	at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:930)	at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:973)	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1093)	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:965)	at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:899)	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:411)	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:248)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:372)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:358)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:350)	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:372)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:358)	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926)	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:129)	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:610)	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:551)	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:465)	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:437)	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:873)	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)	at java.lang.Thread.run(Thread.java:745)