Can't resolve the error: java.lang.NoClassDefFoundError: org/json/simple/parser/ParseException

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Trying to use Maven to organize my project and I keep running into the following error. I know that this error means the file is present at compile time but for some reason it can't be found at runtime.

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/json/simple/parser/ParseException

So I'm working on a project in Java that will take a user query, search Google Images and then download some of the results onto my computer. To that end I've had to use some third party libraries like JSoup, Json-Simple, and Gson.

I initially added Jsoup to my classpath manually and it worked, but then I heard about Maven and started using it instead. My issue is that when I try to run my code I get the error above.

I'm just not sure how to resolve this. I've seen a bunch of other posts about similar errors and I've tried to modify my pom.xml accordingly but I just can't get it to work. I've tried removing the ~/.m2 file, ran mvn clean, mvn install, mvn package, mvn compile, and it all works fine. But when it comes time to run, I keep getting that error.

Here's most of my pom.xml file.

   <name>Maven repository</name>


  <!-- jsoup HTML parser library @ -->

<!-- -->

<!-- -->


FOUND SOLUTION: So I left out some parts of the pom.xml file to make it easier to read, and because all the other parts were generated by Maven itself so I figured there couldn't be an issue with anything there. But it adds a tag called "pluginManagement" that encloses all other plugins and apparently this does not allow the Shade plugin to run.

Between ngueno's guidance and this post Maven shade plugin is not called automatically for goal "package" I was able to figure out my issue, though I'm still not entirely sure why it is an issue. Anyways, I figured I'd update this post in case someone else with a similar problem stumbles across it. This was on Mac OS btw, in case it makes a difference. Thanks for your help everyone.

Skippy give netbeans a shot and see if it comes up with the same error, hopefully if it gives the same error we can start inner working on what exactly is wrong with ya program and hopefully reach to solving ya issue :)

Heres a link that might help you along the lines of your problem ya facing:

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Usually NoClassDefFound errors are related to missing libraries at runtime.

Since you are running using the terminal I supose you are building your project using Maven, and running the generated JAR,

I would recommend to you to use the maven-shade-plugin and generate an uber-jar as I explained on this question.

The purpose generating a uber-jar is to carry all the needed dependencies inside of it (available on the application classpath).

Implement the plugin and try to run using the new JAR.

PS: Remember to check this section related to Executable Jars

UPDATE: Remove the <scope>provided</scope> of your jsoup dependency, to enforce Maven to package it along your app, with the provided scope you are saying that this dependency will be provided by the JDK at runtime.

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The jars that you identify in your dependencies must be present in the Runtime classpath. This is not the classpath that is available when you compile the code; it is the classpath on the host where you run the application.

You must install these jars on the target host.

Edit: More details

You must do the following:

  1. Identify the runtime host.
  2. Create a directory on the runtime host into which you will install the dependent jar files.
  3. Include every jar in the classpath.

Consider abandoning the "roll-your-own" path. If you use Spring Boot (I like it, I don't work for them). One feature of spring boot is a reinvented "Fat Jar" that will include the dependencies inside one deliverable artifact (the fat jar) and will add them to the classpath at startup.

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