Question

嗨，我正在使用Maven，我正在尝试生成Excel，然后将其作为附件发送到NetBeans中的电子邮件中。我没有收到任何错误，但是在我的tomcat中，我收到了以下错误，我将非常感谢您的帮助或建议

我的pom

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.4.5</version>

</dependency>


    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1.1</version>
    </dependency>
        <!-- https://mvnrepository.com/artifact/net.sourceforge.jexcelapi/jxl -->
        <dependency>
     <groupId>net.sourceforge.jexcelapi</groupId>
    <artifactId>jxl</artifactId>
    <version>2.6.12</version>
</dependency>
        <!-- End change plugin specific dependencies here -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.15</version>
            <type>jar</type>
        </dependency>
    </dependencies>

错误

SEVERE [http-nio-443-exec-10] org.oo.project1.try1.execute null
     java.lang.ClassCastException: javax.mail.util.ByteArrayDataSource cannot be cast to javax.sql.DataSource
            at org.oo.project1.try1.sendMail(carexcel.java:282)
            at org.oo.project1.try1.tryy(carexcel.java:240)
            at org.oo.project1.try1.execute(carexcel.java:116)

Answer 1

尝试将<scope>provided</scope>添加到您的javax.mail依赖项中，然后重新启动并重新部署Tomcat。

Answer 2

看起来您的代码已导入，使javax.sql.DataSource与javax.activation.DataSource混淆。

Tomcat错误java.lang.ClassCastException：

2 个答案: