Confluence Servlet module class cast exception

Confluence Development Confluence Data Center
,
4

Just copy pasted my servlet dependencies as you didn’t say anything about the Confluence versions itself. Hope that helps.

Confluence 7
===
...
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.4</version>
    <scope>provided</scope>
</dependency>

Confluence 8 & 9
===
...
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.atlassian.confluence</groupId>
            <artifactId>confluence-plugins-platform-pom</artifactId>
            <version>${confluence.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
...
<dependency>
    <groupId>jakarta.servlet</groupId>
    <artifactId>jakarta.servlet-api</artifactId>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>jakarta.servlet.jsp</groupId>
    <artifactId>jakarta.servlet.jsp-api</artifactId>
    <scope>provided</scope>
</dependency>