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I'm unable to start my webapp on my Tomcat 7.0 Server because of the following error :

java.lang.ClassCastException: org.glassfish.jersey.servlet.ServletContainer cannot be cast to javax.servlet.Servlet

My web.xml , which include the ServlectContainer :

<?xml version="1.0" encoding="UTF-8"?> <!-- This web.xml file is not required when using Servlet 3.0 container, see implementation details http://jersey.java.net/nonav/documentation/latest/jax-rs.html --> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>Jersey Web Application</servlet-name> <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class> <init-param> <param-name>jersey.config.server.provider.packages</param-name> <param-value>fr.tessi</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Jersey Web Application</servlet-name> <url-pattern>/webapi/*</url-pattern> </servlet-mapping> </web-app>

And here's my pom.xml : 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>fr.tessi</groupId> <artifactId>cassandra-cli-back</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>cassandra-cli-back</name> <build> <finalName>cassandra-cli-back</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.5.1</version> <inherited>true</inherited> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin> </plugins> </build> <dependencyManagement> <dependencies> <dependency> <groupId>org.glassfish.jersey</groupId> <artifactId>jersey-bom</artifactId> <version>${jersey.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.glassfish.jersey.containers</groupId> <artifactId>jersey-container-servlet-core</artifactId> <!-- use the following artifactId if you don't need servlet 2.x compatibility --> <!-- artifactId>jersey-container-servlet</artifactId --> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>${jackson-2-version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.jaxrs</groupId> <artifactId>jackson-jaxrs-json-provider</artifactId> <version>${jackson-2-version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>${jackson-2-version}</version> </dependency> <dependency> <groupId>org.glassfish.jersey.media</groupId> <artifactId>jersey-media-moxy</artifactId> </dependency> <dependency> <groupId>com.netflix.astyanax</groupId> <artifactId>astyanax-core</artifactId> <version>1.56.48</version> </dependency> <dependency> <groupId>com.netflix.astyanax</groupId> <artifactId>astyanax-cassandra</artifactId> <version>1.56.48</version> </dependency> <dependency> <groupId>com.netflix.astyanax</groupId> <artifactId>astyanax-thrift</artifactId> <version>1.56.48</version> </dependency> <!-- <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.6.1</version> </dependency> --> </dependencies> <properties> <jersey.version>2.6</jersey.version> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <jackson-2-version>2.4.3</jackson-2-version> </properties>

Despite the scope provided on the 'servlet-api' dependency, it's still downloaded on stratup.

Already tried to change the servlet-class with multiples classes found on StackOverFlow and other websites, but no results. It keep sending an error.

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3 Answers 3

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2

Is the servlet-api.jar included in your war file? If so, remove it manually.

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6 Comments

Yep. "servlet-api-2.5.jar" And even if I delete it from .m2 folder, it's back when I update my Maven project.
No, you can not remote it from .m2, it is used to compile. I meant the deployed war file/WEB-INF/lib.
Ehm. I do not have a lib folder into my WEB-INF.
You can use <packagingExcludes> to user war plug to exclude jar files from WEB-INF/lib folder.
Try this <packagingExcludes>WEB-INF/lib/servlet-api-2.5.jar</packagingExcludes>
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2

My colleague sorted out the problem. Basically, dependencies conflict. Here is the functionnal dependencies' list : 

<dependencyManagement> <dependencies> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.glassfish.jersey.containers</groupId> <!-- if your container implements Servlet API older than 3.0, use "jersey-container-servlet-core" --> <artifactId>jersey-container-servlet</artifactId> <version>2.13</version> </dependency> <!-- Required only when you are using JAX-RS Client --> <dependency> <groupId>org.glassfish.jersey.core</groupId> <artifactId>jersey-client</artifactId> <version>2.13</version> </dependency> <dependency> <groupId>org.glassfish.jersey.media</groupId> <artifactId>jersey-media-json-jackson</artifactId> <version>2.13</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>${jackson-2-version}</version> </dependency> <dependency> <!-- note: typically only ".0" patch version exists for core annotations --> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>${jackson-2-version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.jaxrs</groupId> <artifactId>jackson-jaxrs-json-provider</artifactId> <version>${jackson-2-version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>${jackson-2-version}</version> </dependency> <dependency> <groupId>com.netflix.astyanax</groupId> <artifactId>astyanax-core</artifactId> <version>1.56.48</version> </dependency> <dependency> <groupId>com.netflix.astyanax</groupId> <artifactId>astyanax-cassandra</artifactId> <version>1.56.48</version> <exclusions> <exclusion> <artifactId>servlet-api</artifactId> <groupId>org.mortbay.jetty</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.netflix.astyanax</groupId> <artifactId>astyanax-thrift</artifactId> <version>1.56.48</version> </dependency> <!-- <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.6.1</version> </dependency> --> </dependencies> <properties> <jersey.version>2.13</jersey.version> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <jackson-2-version>2.4.3</jackson-2-version> </properties>

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Jersey-server dependency is required, add it to your pom.xml and try deploying.

 <dependency> <groupId>org.glassfish.jersey.core</groupId> <artifactId>jersey-server</artifactId> <version>2.11</version> </dependency>
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Same problem after adding jersey-server to my pom.
This is a ClassCastException, not something about a missing class!

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