java.lang.ClassNotFoundException: javax.persistence.Entity

Question

I got a sample project, copied from somewhere else, when I am trying to run it in netbeans I am getting some error/exceptions in tomcat's console window.

java.lang.ClassNotFoundException: javax.persistence.Entity
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1711)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
    at org.springframework.core.type.classreading.RecursiveAnnotationAttributesVisitor.visitEnd(AnnotationAttributesReadingVisitor.java:167)
    at org.springframework.asm.ClassReader.a(Unknown Source)
    at org.springframework.asm.ClassReader.accept(Unknown Source)
    at org.springframework.asm.ClassReader.accept(Unknown Source)

javax.persistence is already added to my project. I even removed and re-added in netbeans but still same error. This error is when running the web applictation not when compiling. enter image description here

You need to add the Persistence Jar Files to your BuildPath. — Rohit Jain
– Rohit Jain, Commented Oct 17, 2012 at 11:02
Ok, added some info on how to download the jar files. You need to create a directory called lib in your project set up, add the jars there, then include them in your build path . For this right click on project -> goto java build path -> add jars . — The Dark Knight
– The Dark Knight, Commented Oct 17, 2012 at 11:07
Are you getting tomcat 7 welcome page , when you start the server in your localhost:8080 or whatever your port no is set at ? — The Dark Knight
– The Dark Knight, Commented Oct 17, 2012 at 11:12

Rohit Jain · Accepted Answer · 2012-10-17 11:12:28Z

1

You need to add following Jar Files to your Build Path: -

javax.persistence_2.0.3.v201010191057.jar
org.eclipse.persistence.jpa_2.3.0.v20110604-r9504.jar
org.eclipse.persistence.jpa.equinox_2.3.1.v20111018-r10243.jar
org.eclipse.persistence.antlr_2.3.0.v20110604-r9504.jar
org.eclipse.persistence.asm_2.3.0.v20110604-r9504.jar

Preferably adding the first one will work, as javax.persistence.Entity is found in that Jar only. But you may also need to add the later ones, for working with JPA

Google them with the name of JPA Jars. You will get them.

edited Oct 17, 2012 at 11:12

answered Oct 17, 2012 at 11:05

Rohit Jain

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10 Comments

coure2011 Over a year ago

how to add a jar file to build path?

Rohit Jain Over a year ago

@coure2011 See these links: - plugins.netbeans.org/plugin/11451/addtolibrary and stackoverflow.com/questions/4879903/…

Rohit Jain Over a year ago

@coure2011 You need to create a lib folder under your Project directory, and add all the Jar files in that folder.

The Dark Knight Over a year ago

Only doing that will not help, he needs to import the jars in his build path from lib dir

Rohit Jain Over a year ago

@TheDarkKnight Yeah that's what the links I gave tells. I gave to him so that he can understand it better..

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Arjan Tijms · Accepted Answer · 2012-11-11 14:06:07Z

0

The javax.persistence.Entity is a class inside the Java EE SDK library “javaee.jar“, you are missing this jar file in your project classpath.

refer this http://www.mkyong.com/hibernate/java-lang-classnotfoundexception-javax-persistence-entity/

edited Nov 11, 2012 at 14:06

Arjan Tijms

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answered Oct 17, 2012 at 11:04

Sathish

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1 Comment

Stephen C Over a year ago

I don't think this is the right solution for Tomcat. You only need the JPA-API JAR file ... not all of the J2EE APIs. (You already have a lot of the J2EE APIs and implementation classes in Tomcat.)

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