java.lang.ClassNotFoundException: org.mockserver.version.Version

Question

I am trying to start mock server with mockserver-netty-5.13.2 from shell, java version: 11.0.9

Rough shell code like this:

java -version
echo "start shell before java -jar line"
java -jar ./mockserver-netty-5.13.2.jar -serverPort 9090 -logLevel DEBUG &> ${DIR}/mockserver.log 

The exception thrown from java -jar ./mockserver-netty-5.13.2.jar -serverPort 9090

Exception in thread "main" java.lang.NoClassDefFoundError: org/mockserver/version/Version
    at org.mockserver.cli.Main.<clinit>(Main.java:27)
Caused by: java.lang.ClassNotFoundException: org.mockserver.version.Version
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    ... 1 more

Has anyone run into this issue and resolved it ? Any help would be much appreciated !!!

Answer 1

I was able to replicate the problem within a very similar environment as yours. The issue is caused because your are using the wrong jar. To run the mockserver from the command line you should use a -shaded jar, where it's dependencies are included. The jar you are using does not include the required dependencies and it is not supposed to be ran in the command line without providing them by hand as part of the classpath. The error you get

Caused by: java.lang.ClassNotFoundException: org.mockserver.version.Version

pretty much supports this conclusion, and tells you that the org.mockserver.version.Version class is not provided when you run this specific jar.
Here, is the official docs that indicate you should use the shaded jar to run mockserver from the command line.
Here you can download the mockserver 5.13.2 shaded jar. Then, run it like this

java -jar ./mockserver-netty-5.13.2-shaded.jar -serverPort 9090 -logLevel DEBUG &> ${DIR}/mockserver.log 

Hope that helps!