尽管添加了 JAR 文件，但无法加载 JDBC 驱动程序 class 'oracle.jdbc.OracleDriver'

Question

我试图通过在 Tomcat v7.0 上部署它来运行 myEclipse 上的 java Web 应用程序。我正在尝试将它连接到我的 Oracle 数据库 19c。我已经在类路径中添加了 ojdbc jar 文件，如图所示 here。但我仍然收到错误。

错误的根本原因显示为 this

下面是我的 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，控制台开头也会显示此错误消息：

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

Answer 1

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。

尽管添加了 JAR 文件，但无法加载 JDBC 驱动程序 class 'oracle.jdbc.OracleDriver'

Cannot load JDBC driver class 'oracle.jdbc.OracleDriver' despite adding JAR file

java

oracle

datasource

ojdbc

myeclipse