Question

我需要将sqljdbc42.jar库添加到classpath，以便我可以连接到Azure SQL数据库。如何（如果可能）我可以在Azure Web服务 - Web App（带有Tomcat服务器的Java）中执行此操作。有没有其他方法可以添加JDBC库？

服务器错误：

    java.sql.SQLException: No suitable driver found for jdbc:sqlserver://XXXXXXX.database.windows.net:1433;database=XXXXXX;user=XXXXX@XXXXX;password=XXXXXXXX;encrypt=true;trustServerCertificate=false;hostNameInCertificate=*.database.windows.net;loginTimeout=30;
    at java.sql.DriverManager.getConnection(DriverManager.java:689)
    at java.sql.DriverManager.getConnection(DriverManager.java:270)
    at common.DBConnection.<init>(DBConnection.java:23)
    at servlets.Login.doPost(Login.java:77)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
Dec 30, 2015 3:04:48 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [servlets.Login] in context with path [/deviceweb] threw exception
java.lang.NullPointerException
    at common.DBConnection.addParameter(DBConnection.java:33)
    at servlets.Login.doPost(Login.java:78)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

网页错误：

    type: Exception report

    message:

    description: The server encountered an internal error that prevented it from fulfilling this request.

    exception:

    java.lang.NullPointerException
        common.DBConnection.addParameter(DBConnection.java:33)
        servlets.Login.doPost(Login.java:78)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

note: The full stack trace of the root cause is available in the Apache Tomcat/8.0.30 logs.

连接字符串：

String connectionString = "jdbc:sqlserver://testnabaza.database.windows.net:1433;" + "database=testnabaza;"
            + "user=butterbeast@testnabaza;" + "password=1!qQaaaaaa;" + "encrypt=true;"
            + "trustServerCertificate=false;" + "hostNameInCertificate=*.database.windows.net;" + "loginTimeout=30;";

从Portal复制： JDBC：SQLSERVER：//testnabaza.database.windows.net：1433;数据库= testnabaza;用户= butterbeast @ testnabaza;密码= {your_password_here};加密= TRUE; trustServerCertificate = FALSE; hostNameInCertificate = * database.windows.net; loginTimeout = 30;

Answer 1

最简单的方法是简单地将sqljdbc42.jar文件（可能位于C：\ Program Files \ Microsoft SQL Server JDBC Driver \ sqljdbc_3.X \ enu中）添加到本地Java安装的\ lib \ ext目录中在创建.zip文件之前。

获得最佳帮助使用给定的链接 https://dzone.com/articles/java-access-sql-azure-jdbc

Answer 2

根据我的经验，将inner_values = [dictionary.values()[0] for dictionary in list[0]]库（请从官方网站https://www.microsoft.com/en-US/download/details.aspx?id=11774下载）添加到类路径的简单方法是将jdbc驱动程序文件拖放或复制到目录{{1 Eclipse中的sqljdbc42.jar，请参见下图。

从Eclipse中的项目导出war文件时，库文件将包含在其中。然后，您可以使用Tomcat将war文件部署到Azure WebApp for Java中，它将正常工作。

在大多数情况下，例外WebContent/WEB-INF/lib是由错误的网址引起的。请检查您的连接字符串并正确使用它进行Java jdbc编程。

作为参考，这是我的简单代码。

Dynamic Web Project

Answer 3

我收到了Azure团队的回复，他说我不太可能通过Web App解决这个问题，但我需要创建Cloud Service：

不幸的是，JDBC库属于Tomcat漂亮的领域   很多人强迫你把它们放在CATALINA_HOME \ lib中，但是你需要这样做   确保您输入的驱动程序适用于您的所有Web应用程序   在那个Tomcat。

据我记得，这与Tomcat内存有关   防止泄漏，使Tomcat只扫描CATALINA_HOME \ lib一次   Tomcat启动数据库驱动程序。有充分的理由这样做   与驱动程序如何在JVM中注册自身以及如何实现相关联   影响类加载器。即使你想禁用这个行为，   你必须编辑server.xml，这将再次驱使你拥有你的   拥有Tomcat安装。

所以我漫无边际叙事的结果就是你   需要从库中安装Tomcat或上传自己的版本和   然后将您的JDBC驱动程序放在Tomcat \ lib目录中。你是   尝试使用Java的UI支持为您做更多的事情   应用

https://azure.microsoft.com/en-us/documentation/articles/web-sites-java-add-app/

互联网上有过时的教程，但可以帮助找出要做的事情。 subhash singh 链接帮助了我一般的想法，但教程已经过时，有点令人困惑。

Azure Java Web App将库添加到Classpath

3 个答案: