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经过几天的工作，我在应用程序中遇到了阻塞 java.security.Provider.getService(String, String) 的问题。这是 subethasmtp 的堆栈跟踪，但在所有其他线程（IMAP、HTTPS 等）上都是一样的。

Java Monitor Blocked
 at java.security.Provider.getService(String, String)
 at sun.security.jca.ProviderList$ServiceList.tryGet(int)
 at sun.security.jca.ProviderList$ServiceList.access$200(ProviderList$ServiceList, int)
 at sun.security.jca.ProviderList$ServiceList$1.hasNext()
 at javax.crypto.KeyGenerator.nextSpi(KeyGeneratorSpi, boolean)
 at javax.crypto.KeyGenerator.<init>(String)
 at javax.crypto.KeyGenerator.getInstance(String)
 at sun.security.ssl.JsseJce.getKeyGenerator(String)
 at sun.security.ssl.HandshakeMessage$Finished.getFinished(HandshakeHash, int, SecretKey)
 at sun.security.ssl.HandshakeMessage$Finished.<init>(ProtocolVersion, HandshakeHash, int, SecretKey, CipherSuite)
 at sun.security.ssl.ServerHandshaker.sendChangeCipherAndFinish(boolean)
 at sun.security.ssl.ServerHandshaker.clientHello(HandshakeMessage$ClientHello)
 at sun.security.ssl.ServerHandshaker.processMessage(byte, int)
 at sun.security.ssl.Handshaker.processLoop()
 at sun.security.ssl.Handshaker.process_record(InputRecord, boolean)
 at sun.security.ssl.SSLSocketImpl.readRecord(InputRecord, boolean)
 at sun.security.ssl.SSLSocketImpl.performInitialHandshake()
 at sun.security.ssl.SSLSocketImpl.startHandshake(boolean)
 at sun.security.ssl.SSLSocketImpl.startHandshake()
 at org.subethamail.smtp.command.StartTLSCommand.execute(String, Session)
 at org.subethamail.smtp.server.CommandHandler.handleCommand(Session, String)
 at org.subethamail.smtp.server.Session.runCommandLoop()
 at org.subethamail.smtp.server.Session.run()
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run()
 at java.lang.Thread.run()

** JFR 快照图像上的红色块是 java.security.Provider.getService 块 **

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1 回答 1

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JDK 中的服务提供者采用全局锁，这会导致争用。

我会介绍一个缓存。如果对服务提供商的调用是在第三方库中，我会更改为另一个库。

于 2018-06-26T00:30:19.417 回答