java lang NoClassDefFoundError org apache http client HttpClient

Question

I am trying to make a get request from the GWT servlet to get JSON response from a web service  Following is the code in my servlet    public String getQueData   throws IllegalArgumentException       String message   null      try                      HttpClient httpclient   new DefaultHttpClient             JSONParser parser   new JSONParser             String url    working - url           HttpResponse response   null          response   httpclient execute new HttpGet url             JSONObject json data   null          json data    JSONObject parser parse EntityUtils toString response getEntity              JSONArray results    JSONArray json data get  result            for  Object queid   results                message   message concat  String    JSONObject queid  get  id                 message   message concat   t                message   message concat  String    JSONObject queid  get  owner                 message   message concat   n                      catch  Exception e        message   e toString              return message      Getting the following exception on trying to make get request from a GWT servlet   java lang NoClassDefFoundError  org apache http client HttpClient     at java lang Class getDeclaredConstructors0 Native Method      at java lang Class privateGetDeclaredConstructors Class java 2389      at java lang Class getConstructor0 Class java 2699      at java lang Class newInstance0 Class java 326      at java lang Class newInstance Class java 308      at org mortbay jetty servlet Holder newInstance Holder java 153      at org mortbay jetty servlet ServletHolder initServlet ServletHolder java 428      at org mortbay jetty servlet ServletHolder getServlet ServletHolder java 339      at org mortbay jetty servlet ServletHolder handle ServletHolder java 487      at org mortbay jetty servlet ServletHandler CachedChain doFilter ServletHandler java 1166      at com google appengine tools development HeaderVerificationFilter doFilter HeaderVerificationFilter java 35      at org mortbay jetty servlet ServletHandler CachedChain doFilter ServletHandler java 1157      at com google appengine api blobstore dev ServeBlobFilter doFilter ServeBlobFilter java 60      at org mortbay jetty servlet ServletHandler CachedChain doFilter ServletHandler java 1157      at com google apphosting utils servlet TransactionCleanupFilter doFilter TransactionCleanupFilter java 43      at org mortbay jetty servlet ServletHandler CachedChain doFilter ServletHandler java 1157      at com google appengine tools development StaticFileFilter doFilter StaticFileFilter java 122      at org mortbay jetty servlet ServletHandler CachedChain doFilter ServletHandler java 1157      at com google appengine tools development BackendServersFilter doFilter BackendServersFilter java 97      at org mortbay jetty servlet ServletHandler CachedChain doFilter ServletHandler java 1157      at org mortbay jetty servlet ServletHandler handle ServletHandler java 388      at org mortbay jetty security SecurityHandler handle SecurityHandler java 216      at org mortbay jetty servlet SessionHandler handle SessionHandler java 182      at org mortbay jetty handler ContextHandler handle ContextHandler java 765      at org mortbay jetty webapp WebAppContext handle WebAppContext java 418      at com google appengine tools development DevAppEngineWebAppContext handle DevAppEngineWebAppContext java 78      at org mortbay jetty handler HandlerWrapper handle HandlerWrapper java 152      at com google appengine tools development JettyContainerService ApiProxyHandler handle JettyContainerService java 362      at org mortbay jetty handler HandlerWrapper handle HandlerWrapper java 152      at org mortbay jetty Server handle Server java 326      at org mortbay jetty HttpConnection handleRequest HttpConnection java 542      at org mortbay jetty HttpConnection RequestHandler content HttpConnection java 938      at org mortbay jetty HttpParser parseNext HttpParser java 755      at org mortbay jetty HttpParser parseAvailable HttpParser java 218      at org mortbay jetty HttpConnection handle HttpConnection java 404      at org mortbay io nio SelectChannelEndPoint run SelectChannelEndPoint java 409      at org mortbay thread QueuedThreadPool PoolThread run QueuedThreadPool java 582  Caused by  java lang ClassNotFoundException  org apache http client HttpClient     at java net URLClassLoader 1 run URLClassLoader java 202      at java security AccessController doPrivileged Native Method      at java net URLClassLoader findClass URLClassLoader java 190      at java lang ClassLoader loadClass ClassLoader java 306      at com google appengine tools development IsolatedAppClassLoader loadClass IsolatedAppClassLoader java 176      at java lang ClassLoader loadClass ClassLoader java 247    What could be the possible cause of this exception  How it could be removed   I am using jdk1 6 0 30 on ubuntu 10 04

User · Answer

If its a maven project  add the below dependency in your pom file       lt dependency gt           lt groupId gt org apache httpcomponents lt  groupId gt           lt artifactId gt httpclient lt  artifactId gt           lt version gt 4 3 4 lt  version gt       lt  dependency gt

User · Answer

This problem occurs if there are different jar versions  Especially versions of httpcore and httpclient  Use same versions of httpcore and httpclient

User · Answer

I was facing the same issue  In my case  I had a dependency of httpclient with an older version while sendgrid required a newer version of httpclient  Just make sure that the version of httpclient is correct in your dependencies and it would work fine

User · Answer

I have solved this problem by importing the following dependency  you must manually import httpclient  lt dependency gt       lt groupId gt commons-httpclient lt  groupId gt       lt artifactId gt commons-httpclient lt  artifactId gt       lt version gt 3 1 lt  version gt       lt exclusions gt           lt exclusion gt               lt groupId gt commons-logging lt  groupId gt               lt artifactId gt   lt  artifactId gt           lt  exclusion gt       lt  exclusions gt   lt  dependency gt

User · Answer

What could be the possible cause of this exception    You may not have appropriate Jar in your class path      How it could be removed    By putting HTTPClient jar in your class path  If it s a webapp  copy Jar into WEB-INF lib if it s standalone  make sure you have this jar in class path or explicitly set using -cp option  as the doc says      Thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the definition of a class  as part of a normal method call or as part of creating a new instance using the new expression  and no definition of the class could be found       The searched-for class definition existed when the currently executing class was compiled  but the definition can no longer be found    Edit  If you are using a dependency management like Maven Gradle  see the answer below  or SBT please use it to bring the httpclient jar for you

User · Answer

I solved this issue for myself  I found there s was two files of http-client with different version of other dependent jar files  So there may version were collapsing between libraries files so remove all old previous libraries files and re-add are jar files from lib folder of this zip file   Donwload Zip file from here

[java] java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient

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