如何忽略 javamail 中的服务器证书错误

当我使用imaps连接到我的imap服务器时，它失败了。

你能告诉我如何忽略javamail中的服务器证书错误吗？

Exception in thread "main"
javax.mail.MessagingException:
sun.security.validator.ValidatorException:
PKIX path building failed:
sun.security.provider.certpath.SunCertPathBuilderException:
unable to find valid certification
path to requested target;   nested
exception is:
    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    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:665)
    at javax.mail.Service.connect(Service.java:295)
    at javax.mail.Service.connect(Service.java:176)
    at App20110204.main(App20110204.java:31)
Caused by:
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    at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1623)
    at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:198)
    at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:192)
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1074)
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:128)
    at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:529)
    at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:465)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:884)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1120)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1147)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1131)
    at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:507)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)
    at com.sun.mail.iap.Protocol.<init>(Protocol.java:113)
    at com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:110)
    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:632)
    ... 3 more Caused 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:294)
    at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:200)
    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 com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:249)
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1053)
    ... 15 more Caused by:
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:289)
    ... 21 more

和我的源代码

Properties prop = new Properties();
prop.put("mail.imap.ssl.checkserveridentity", "false");
prop.put("mail.imap.ssl.trust", "*");

Session session = Session.getDefaultInstance(prop);
Store store = session.getStore("imaps");
store.connect("mail.xxx.com", "xxxx", "p@ssw0rd");
System.out.println(store.getFolder("INBOX").getMessageCount());