SOLVED: java.lang.ClassNotFoundException: com.sun.jersey.spi.container.servlet.ServletContainer

If you have started working on Jersey then you might face this issue while configuring it. This is the result of insufficient project dependencies on runtime. This issue is likely to be faced in the tomcat server.

Random exceptions
Random exceptions

The Error

The error log will look like this.

SEVERE: Servlet /JerseyHelloWorld threw load() exception
java.lang.ClassNotFoundException: com.sun.jersey.spi.container.servlet.ServletContainer
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1713)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1558)
	at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:527)
	at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:509)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:137)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1144)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5033)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5317)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

The Solution

To solve this issue, correct the project dependencies in pom.xml like below. If you are not using maven for project dependencies, include the corresponding jar files in the classpath.

 <dependency>
	<groupId>com.sun.jersey</groupId>
	<artifactId>jersey-server</artifactId>
	<version>1.17.1</version>
</dependency>
<dependency>
	<groupId>com.sun.jersey</groupId>
	<artifactId>jersey-core</artifactId>
	<version>1.17.1</version>
</dependency>
<dependency>
	<groupId>com.sun.jersey</groupId>
	<artifactId>jersey-servlet</artifactId>
	<version>1.17.1</version>
</dependency>

This will solve the issue.

Happy Learning !!

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