java - 使用 MS SQL Server 的 DriverManager 上的 ExceptionInInitializerError

Question

我正在尝试使用 JDBC 连接到 MS SQL Server 数据库，并在这一行上:

String connectionUrl = "jdbc:" + url + ";user=dummy;password=dummy;";
conn = DriverManager.getConnection(connectionUrl);

我收到了一个巨大的错误文本墙:

Exception in thread "main" java.lang.ExceptionInInitializerError
    at javax.crypto.JceSecurityManager.<clinit>(JceSecurityManager.java:65)
    at javax.crypto.Cipher.getConfiguredPermission(Cipher.java:2543)
    at javax.crypto.Cipher.getMaxAllowedKeyLength(Cipher.java:2567)
    at sun.security.ssl.CipherSuite$BulkCipher.isAvailable(CipherSuite.java:548)
    at sun.security.ssl.CipherSuite$BulkCipher.isAvailable(CipherSuite.java:527)
    at sun.security.ssl.CipherSuite.isAvailable(CipherSuite.java:194)
    at sun.security.ssl.SSLContextImpl.getApplicableCipherSuiteList(SSLContextImpl.java:350)
    at sun.security.ssl.SSLContextImpl.getDefaultCipherSuiteList(SSLContextImpl.java:308)
    at sun.security.ssl.SSLSocketImpl.init(SSLSocketImpl.java:607)
    at sun.security.ssl.SSLSocketImpl.<init>(SSLSocketImpl.java:549)
    at sun.security.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:110)
    at com.microsoft.sqlserver.jdbc.TDSChannel.enableSSL(IOBuffer.java:1606)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1323)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:991)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:827)
    at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:270)
    at BusinessManager.Session.<init>(Session.java:33)
    at BusinessManager.BusinessManager.getSession(BusinessManager.java:172)
    at example.Example.ConfigureEnvironment(Example.java:198)
    at example.Example.main(Example.java:50)
Caused by: java.lang.SecurityException: Can not initialize cryptographic mechanism
    at javax.crypto.JceSecurity.<clinit>(JceSecurity.java:89)
    ... 22 more
Caused by: java.lang.SecurityException: Cannot locate policy or framework files!
    at javax.crypto.JceSecurity.setupJurisdictionPolicies(JceSecurity.java:254)
    at javax.crypto.JceSecurity.access$000(JceSecurity.java:48)
    at javax.crypto.JceSecurity$1.run(JceSecurity.java:81)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.crypto.JceSecurity.<clinit>(JceSecurity.java:78)
    ... 22 more

我跟踪了几个链接，确保服务器和客户端都使用相同的 JDK (1.8.0_20)。 我还下载了“JCE Unlimited Strength Jurisdiction Policy Files”并将它们放入 JDK 中。我也关注了这个link但我不确定是否应该干预 JDK 的“java.policy”文件...

Answer 1

根据该错误，我的猜测是您正在尝试使用 SSL 加密 session 连接到 SQL，但在 SQL Server 上使用自签名证书。每Connecting with SSL Encryption :

When the encrypt property is set to true and the trustServerCertificate property is set to true, the Microsoft JDBC Driver for SQL Server will not validate the SQL Server SSL certificate. This is usually required for allowing connections in test environments, such as where the SQL Server instance has only a self signed certificate.

尝试使用:

String connectionUrl = "jdbc:" + url + ";user=dummy;password=dummy;encrypt=true;trustServerCertificate=true;";

此外，您的 url 变量内容应以 sqlserver:// 开头。