java.lang.NoClassDefFoundError

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tip

A few things cause this exception: 1) Check if you have all jars and if they're in the correct path when running. 2) Your classpath might be broken, you can define it in the command line with "java -cp yourClassPath" or at your IDE if you're using one.

tip

If you're using Hibernate, this indicates you're missing FasterXML Classmate dependency, which you can add to your dependencies. To add it, the groupId is com.fasterxml and artifactId is Classmate.

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Check if you didn't forget to instantiate your topic in the kafka broker.

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NoClassDefFoundError means java has failed to find a class you're trying to instantiate, look if you've added the class you're trying to instantiate to the dependencies.

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You need to add httpcore to your dependencies. Try adding version 4.3 or further.

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Needs to add netty-transport-native-epoll with a OS classifier to the classpath, it's not included in netty-all

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    • java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/Base64 at oauth.signpost.signature.OAuthMessageSigner.<init>(OAuthMessageSigner.java:37) at oauth.signpost.signature.HmacSha1MessageSigner.<init>(HmacSha1MessageSigner.java:30) at oauth.signpost.AbstractOAuthConsumer.<init>(AbstractOAuthConsumer.java:65) at oauth.signpost.basic.DefaultOAuthConsumer.<init>(DefaultOAuthConsumer.java:33) at com.google.code.linkedinapi.client.oauth.LinkedInOAuthServiceImpl.getOAuthConsumer(LinkedInOAuthServiceImpl.java:246) at com.google.code.linkedinapi.client.oauth.LinkedInOAuthServiceImpl.getOAuthRequestToken(LinkedInOAuthServiceImpl.java:145) at com.example.TestLink.main(TestLink.java:30) Caused by: java.lang.ClassNotFoundException: org.apache.commons.codec.binary.Base64 at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source)

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