When I try to send emails with Graph, I sometimes get an error as if we don't have the certificate. But the certificates are there, because otherwise emails wouldn't be sent. The error is in the Graph dependencies and not in the code. I am using JavaSDK 11.

Has anyone else encountered the same problem?

DEPENDENCY

    com.microsoft.graph
    microsoft-graph
    5.54.0


    com.microsoft.graph
    microsoft-graph-core
    2.0.18

ERROR:

sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:148)
    at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:129)
    at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:297)
    at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:434)
    ... 38 common frames omitted
Wrapped by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:439)
    at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:306)
    at sun.security.validator.Validator.validate(Validator.java:264)
    at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:313)
    at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:276)
    at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:141)
    at io.netty.handler.ssl.EnhancingX509ExtendedTrustManager.checkServerTrusted(EnhancingX509ExtendedTrustManager.java:69)
    at io.netty.handler.ssl.ReferenceCountedOpenSslClientContext$ExtendedTrustManagerVerifyCallback.verify(ReferenceCountedOpenSslClientContext.java:235)
    at io.netty.handler.ssl.ReferenceCountedOpenSslContext$AbstractCertificateVerifier.verify(ReferenceCountedOpenSslContext.java:790)
    at io.netty.internal.tcnative.CertificateVerifierTask.runTask(CertificateVerifierTask.java:36)
    at io.netty.internal.tcnative.SSLTask.run(SSLTask.java:48)
    at io.netty.internal.tcnative.SSLTask.run(SSLTask.java:42)
    at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.runAndResetNeedTask(ReferenceCountedOpenSslEngine.java:1534)
    at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.access$700(ReferenceCountedOpenSslEngine.java:96)
    at io.netty.handler.ssl.ReferenceCountedOpenSslEngine$TaskDecorator.run(ReferenceCountedOpenSslEngine.java:1509)
    at io.netty.handler.ssl.SslHandler.runDelegatedTasks(SslHandler.java:1647)
    at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1493)
    ... 22 common frames omitted
Wrapped by: javax.net.ssl.SSLHandshakeException: General OpenSslEngine problem
    at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.handshakeException(ReferenceCountedOpenSslEngine.java:1945)
    at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.wrap(ReferenceCountedOpenSslEngine.java:852)
    at javax.net.ssl.SSLEngine.wrap(SSLEngine.java:522)
    at io.netty.handler.ssl.SslHandler.wrap(SslHandler.java:1130)
    at io.netty.handler.ssl.SslHandler.wrapNonAppData(SslHandler.java:974)
    at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1507)
    at io.netty.handler.ssl.SslHandler.decodeNonJdkCompatible(SslHandler.java:1345)
    at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1385)
    at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:529)
    at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:468)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
    at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:800)
    at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe$1.run(AbstractEpollChannel.java:425)
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
    at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:413)
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    ... 1 common frames omitted
Wrapped by: java.io.UncheckedIOException: javax.net.ssl.SSLHandshakeException: General OpenSslEngine problem
    at com.azure.core.http.netty.NettyAsyncHttpClient.sendSync(NettyAsyncHttpClient.java:199)
    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:38)
    at com.azure.core.http.policy.HttpLoggingPolicy.processSync(HttpLoggingPolicy.java:134)
    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:41)
    at com.azure.core.implementation.http.policy.InstrumentationPolicy.processSync(InstrumentationPolicy.java:85)
    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:41)
    at com.azure.core.http.policy.RetryPolicy.attemptSync(RetryPolicy.java:176)
    at com.azure.core.http.policy.RetryPolicy.attemptSync(RetryPolicy.java:188)
    at com.azure.core.http.policy.RetryPolicy.attemptSync(RetryPolicy.java:188)
    at com.azure.core.http.policy.RetryPolicy.attemptSync(RetryPolicy.java:188)
    at com.azure.core.http.policy.RetryPolicy.processSync(RetryPolicy.java:126)
    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:41)
    at com.azure.core.http.policy.HttpPipelineSyncPolicy.processSync(HttpPipelineSyncPolicy.java:42)
    at com.azure.core.http.policy.UserAgentPolicy.processSync(UserAgentPolicy.java:153)
    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:41)
    at com.azure.core.http.HttpPipeline.sendSync(HttpPipeline.java:131)
    at com.azure.identity.implementation.HttpPipelineAdapter.send(HttpPipelineAdapter.java:67)
    at com.microsoft.aad.msal4j.HttpHelper.executeHttpRequestWithRetries(HttpHelper.java:96)
    at com.microsoft.aad.msal4j.HttpHelper.executeHttpRequest(HttpHelper.java:49)
    at com.microsoft.aad.msal4j.AadInstanceDiscoveryProvider.executeRequest(AadInstanceDiscoveryProvider.java:278)
    at com.microsoft.aad.msal4j.AadInstanceDiscoveryProvider.sendInstanceDiscoveryRequest(AadInstanceDiscoveryProvider.java:235)
    at com.microsoft.aad.msal4j.AadInstanceDiscoveryProvider.doInstanceDiscoveryAndCache(AadInstanceDiscoveryProvider.java:339)
    at com.microsoft.aad.msal4j.AadInstanceDiscoveryProvider.getMetadataEntry(AadInstanceDiscoveryProvider.java:88)
    at com.microsoft.aad.msal4j.AuthenticationResultSupplier.getAuthorityWithPrefNetworkHost(AuthenticationResultSupplier.java:39)
    at com.microsoft.aad.msal4j.AcquireTokenSilentSupplier.execute(AcquireTokenSilentSupplier.java:23)
    at com.microsoft.aad.msal4j.AcquireTokenByClientCredentialSupplier.execute(AcquireTokenByClientCredentialSupplier.java:46)
    at com.microsoft.aad.msal4j.AuthenticationResultSupplier.get(AuthenticationResultSupplier.java:69)
    at com.microsoft.aad.msal4j.AuthenticationResultSupplier.get(AuthenticationResultSupplier.java:18)
    at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
    at java.lang.Thread.run(Thread.java:829)