java - Getting an error when using Jackson library netbeans -


i making simple web application on java. added .jar of jackson library work object mapper.

i added imports @ beginning of file.

import com.fasterxml.jackson.databind.objectmapper; import com.fasterxml.jackson.databind.jsonnode;

if run web without

objectmapper mapper = new objectmapper();

it works perfectly, when uncomment line exception.

error 500 javax.servlet.servletexception: servlet execution threw exception     org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52) root cause  java.lang.noclassdeffounderror: com/fasterxml/jackson/core/versioned     java.lang.classloader.defineclass1(native method)     java.lang.classloader.defineclass(classloader.java:763)     java.security.secureclassloader.defineclass(secureclassloader.java:142)     org.apache.catalina.loader.webappclassloaderbase.findclassinternal(webappclassloaderbase.java:2277)     org.apache.catalina.loader.webappclassloaderbase.findclass(webappclassloaderbase.java:811)     org.apache.catalina.loader.webappclassloaderbase.loadclass(webappclassloaderbase.java:1254)     org.apache.catalina.loader.webappclassloaderbase.loadclass(webappclassloaderbase.java:1119)     controller.controller.dopost(controller.java:66)     javax.servlet.http.httpservlet.service(httpservlet.java:661)     javax.servlet.http.httpservlet.service(httpservlet.java:742)     org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52)  root cause  java.lang.classnotfoundexception: com.fasterxml.jackson.core.versioned     org.apache.catalina.loader.webappclassloaderbase.loadclass(webappclassloaderbase.java:1285)     org.apache.catalina.loader.webappclassloaderbase.loadclass(webappclassloaderbase.java:1119)     java.lang.classloader.defineclass1(native method)     java.lang.classloader.defineclass(classloader.java:763)     java.security.secureclassloader.defineclass(secureclassloader.java:142)     org.apache.catalina.loader.webappclassloaderbase.findclassinternal(webappclassloaderbase.java:2277)     org.apache.catalina.loader.webappclassloaderbase.findclass(webappclassloaderbase.java:811)     org.apache.catalina.loader.webappclassloaderbase.loadclass(webappclassloaderbase.java:1254)     org.apache.catalina.loader.webappclassloaderbase.loadclass(webappclassloaderbase.java:1119)     controller.controller.dopost(controller.java:66)     javax.servlet.http.httpservlet.service(httpservlet.java:661)     javax.servlet.http.httpservlet.service(httpservlet.java:742)     org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52)

any ideas?

fixed:

i had add jackson core , annotations.


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