I am getting java lang ClassNotFoundException com google gson Gson error even though it is defined in my classpath

Question

I m trying to parse some JSON object strings that I m getting using gson-1 6 jar  I have placed it in the same location as my other  jars and have added it to my buildpath in eclipse  The other libraries worked fine when I added them and I can use them without any issues  but when I try to create the JSON object  I get the titular error  I ve looked through the other questions with this error  but I couldn t find a solution that didn t involve something that I ve tried or something unrelated  I import it near the top using  import com google gson Gson   Then use it later in a static function like so  Gson g   new Gson     Here is my eclipse generated classpath file  Path  substituted for actual path   lt  xml version  quot 1 0 quot  encoding  quot UTF-8 quot   gt   lt classpath gt       lt classpathentry kind  quot src quot  path  quot src quot   gt       lt classpathentry kind  quot con quot  path  quot org eclipse jdt launching JRE CONTAINER org eclipse jdt internal debug ui launcher StandardVMType jre6 quot  gt           lt attributes gt               lt attribute name  quot owner project facets quot  value  quot java quot   gt           lt  attributes gt       lt  classpathentry gt       lt classpathentry kind  quot con quot  path  quot org eclipse jst server core container org eclipse jst server tomcat runtimeTarget Apache Tomcat v5 5 quot  gt           lt attributes gt               lt attribute name  quot owner project facets quot  value  quot jst web quot   gt           lt  attributes gt       lt  classpathentry gt       lt classpathentry kind  quot con quot  path  quot org eclipse jst j2ee internal web container quot   gt       lt classpathentry kind  quot con quot  path  quot org eclipse jst j2ee internal module container quot   gt       lt classpathentry kind  quot lib quot  path  quot  Path  jabbabase-ws-jwsdp-client-2 4 7 jar quot   gt       lt classpathentry kind  quot lib quot  path  quot  Path  log4j-1 2 16 jar quot   gt       lt classpathentry kind  quot lib quot  path  quot  Path  gson-1 6 jar quot   gt       lt classpathentry kind  quot output quot  path  quot build classes quot   gt   lt  classpath gt   as well as my build path window   I m a little lost at this point   I ve tried Google and the posts basically just say to add to your build path   Anybody have any ideas  Edit  More Info The code referencing com google gson GSON is used as a bean by a jsp   This function is called from the jsp and the error occurs as soon as the function is executed  The first line in the function is  Gson g   new Gson     It seems to compile and deploy fine  but when it is executed  I get the error message  Thanks

User · Answer

I was just having the same issue     To resolve the problem  at least in my case  ensure you have included the lib folder in your bundle classpath   Manifest-Version  1 0      Bundle-ClassPath  lib gson-1 6 jar           Or if you want to include all jar s in the folder   Bundle-ClassPath  lib    You will still need to place the jar files on the java build path as shown above   Then your imported jar s should appear in the folder  Referenced Libraries

User · Answer

Click on Deployment Assembly   right above Java Build Path that you show as active   and make sure that you see json-lib-2 4-jdk15 jar there   Usually  you should add it to your build path and export it from your project   Once it s exported you will see the WTP warning that it s not a part of the deployment   Choose the Quick Fix option and add it to your deployment path

User · Answer

Do the Quick fix in the Markers tab     Reference  https   metamug com blog eclipse-gson-class-not-found

User · Answer

I ran into the above error when building and running inside Eclipse  where everything seemed to be fine  with the exception of this error  However  I discovered that a Maven build failed and that I needed to include Gson in my pom xml  After fixing the pom xml  everything fell into place

User · Answer

I faced same problem and tried above solutions but none of them worked for me  Then I tried following steps and the problem was solved    Go to the project properties  Go to Java Build Path option  Then add   jar file as external jar  Then go to the order and export option and select the libraries and jars of the project  save the current changes and clean the project and run the project again

User · Answer

Well for me the problem got resolved by adding the jars in my APACHE TOMCAT lib folder

User · Answer

In case of a JSP Servlet webapplication  you just need to drop 3rd party JAR files in  WEB-INF lib folder  If the project is a Dynamic Web Project  then Eclipse will automatically take care about setting the buildpath right as well  You do not need to fiddle with Eclipse buildpath  Don t forget to undo it all

User · Answer

you can include maven dependency like below in your pom xml file  lt  -- https   mvnrepository com artifact com google code gson gson -- gt   lt dependency gt   lt groupId gt com google code gson lt  groupId gt   lt artifactId gt gson lt  artifactId gt   lt version gt 2 8 6 lt  version gt    lt  dependency gt

User · Answer

I had the same problem when developing a KNIME Node plugin in the Eclipse environment  The solution was not only to add the gson jar as an externar JAR to the build path  it was also required to go to plugin xml  then the Dependencies tab and add com google gson as a required plugin

[java] I am getting "java.lang.ClassNotFoundException: com.google.gson.Gson" error even though it is defined in my classpath

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