尽管添加了 JAR 文件，但仍无法加载 JDBC 驱动程序类“oracle.jdbc.OracleDriver”

如何解决尽管添加了 JAR 文件，但仍无法加载 JDBC 驱动程序类“oracle.jdbc.OracleDriver”

我试图通过在 Tomcat v7.0 上部署一个 java web 应用程序在 myEclipse 上运行它。我正在尝试将它连接到我的 Oracle 数据库 19c。我在类路径中添加了 ojdbc jar 文件，如 here 所示。 但是我仍然收到错误。

错误的根本原因显示为 this

以下是我的 context.xml 文件：

    <?xml version="1.0" encoding="UTF-8"?>
<Context>
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<Resource name="jdbc/secure_mail" auth="Container" type="javax.sql.DataSource"
    driverClassName="oracle.jdbc.OracleDriver" url="jdbc:oracle:thin:@localhost:1521:orcl"
    username="c##scott" password="mathsformula" maxActive="20" maxIdle="10"
    maxWait="-1" />
</Context>

这是我的数据源定义：

public void init(ServletConfig config) throws servletexception {
        try {
            InitialContext initContext = new InitialContext();

            Context env = (Context) initContext.lookup("java:/comp/env");

            ds = (DataSource) env.lookup("jdbc/secure_mail");

        } catch (NamingException e) {
            throw new servletexception();
        }
    }

知道是什么原因造成的吗？我是否添加了错误的 JAR 文件，还是因为我使用的是 Tomcat v7.0？谢谢。

编辑：

每当我运行 Web 应用程序时，我也会在控制台的开头显示此错误消息：

java.lang.UnsatisfiedLinkError: C:\Users\kuman\Downloads\apache-tomcat-7.0.109-src\apache-tomcat-7.0.109-src\apache-tomcat-7.0.47\bin\tcnative-1.dll: Can't load IA 32-bit .dll on a AMD 64-bit platform
    at java.base/java.lang.classLoader$NativeLibrary.load0(Native Method)
    at java.base/java.lang.classLoader$NativeLibrary.load(ClassLoader.java:2452)
    at java.base/java.lang.classLoader$NativeLibrary.loadLibrary(ClassLoader.java:2508)
    at java.base/java.lang.classLoader.loadLibrary0(ClassLoader.java:2704)
    at java.base/java.lang.classLoader.loadLibrary(ClassLoader.java:2669)
    at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:807)
    at java.base/java.lang.System.loadLibrary(System.java:1907)
    at org.apache.tomcat.jni.Library.<init>(Library.java:42)
    at org.apache.tomcat.jni.Library.initialize(Library.java:174)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.apache.catalina.core.AprLifecycleListener.init(AprLifecycleListener.java:180)
    at org.apache.catalina.core.AprLifecycleListener.isAprAvailable(AprLifecycleListener.java:85)
    at org.apache.catalina.connector.Connector.setProtocol(Connector.java:595)
    at org.apache.catalina.connector.Connector.<init>(Connector.java:69)
    at org.apache.catalina.startup.ConnectorCreateRule.begin(ConnectorCreateRule.java:62)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1276)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:518)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:183)
    at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1386)
    at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2725)
    at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:605)
    at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:541)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:888)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:824)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
    at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1224)
    at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:635)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1537)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:617)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:665)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:281)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455)
Jun 19,2021 12:12:40 PM org.apache.catalina.core.AprLifecycleListener init

解决方法

你应该把jar放在CATALINA_HOME/lib目录下，即你tomcat安装目录的lib文件夹。