Classpath is empty. Please build the project first e.g. by running './gradlew jar -PscalaVersion=2.11.12'

Question

I am not able to run a Apache Kafka service due to a failure while trying to start a Zookeeper instance. I have downloaded and tried it with all 3 availabe downloads at the official site. (binarys and source) When i try to start zookeeper with

./bin/zookeeper-server-start.sh config/zookeeper.properties

I always get the same error message:

Classpath is empty. Please build the project first e.g. by running './gradlew jar -PscalaVersion=2.11.12'

The same goes for (after starting a seperate zookeeper (not the build-in from kakfa) instance)

./bin/kafka-server-start.sh config/server.properties

I have tried it under Ubuntu 17.04 and 18.04. When i try this on a virtual machine using Ubuntu 16.04 it works.

Unfortunatly, all i found regarding this problem, was for Windows. Thank you for any help.

Utile

Is it resolved for you, cause I'm getting the same error, I'm using ubuntu 16.04 – Ferwerda

because of some issues with my machine i freshly set up Ubuntu and now after that it worked following the standard tutorial – Utile

I had the same problem , I have resolved by downloading "Binary downloads" instead of "Source download" kafka.apache.org/downloads.html – Pedrick

Answer 1

In my case it has nothing to do with the binary or source cause both of them give that same "classpath is empty please build the project first" error. Its because there is a space in the path where kafka resides.

Updraft

Please help to resolve this problem, I'm getting the same error, Classpath is empty. Please build the project first e.g. by running './gradlew jar -PscalaVersion=2.11.12' – Ferwerda

This is the correct answer. When I removed the space in the Kafka folder name. It was able to start up again. Thanks for sharing the solution! – Tender

Just saved my life. I accidentally moved my kafka folder to another folder whose name has a space in between ('My Folder' for example). Moving the kafka folder back to the original place fixed the problem! – Risinger

Thanks allot worked for me, the root folder of the path where i had copied Kafka had a space in its name. removing that fixed the zookeeper-server-start issue. – Coffin

Answer 2

I had the same issue, the problem was I was downloading the source of Kafka. So to make my Kafka server run, I downloaded the Kafka binaries and it worked for me.

Kafka binaries: http://mirror.cc.columbia.edu/pub/software/apache/kafka/1.1.0/

Hubsher

thank you but i already tried with the binaries (as mentioned in the first post) and got the same error. because of some issues with my machine i freshly set up Ubuntu and now it works. – Utile

Answer 3

We need to download kafka-binary and not the source Download Binary from mirror http://mirrors.estointernet.in/apache/kafka/2.2.0/kafka_2.11-2.2.0.tgz

Onceover

Go to kafka.apache.org/downloads and choose most suitable version – Dole

Answer 4

Go to your terminal and run:

$ ./gradlew jar -PscalaVersion=2.11.12

Mittel

this has to be executed inside de donwloaded folder – Jinajingle

Answer 5

I had the same issue. I solved it when removed the white spases from my folder name e.g "Kafka binary" -> "Kafka_binary".

Stomach

Answer 6

I have the same message when I try bin/kafka-topic.sh.

It's just because you have a space in the full path.

Go to the folder and execute "pwd", in the path, you must change the white space of folder by an underscore or use camel case.

Amadeus

Answer 7

I changed the path:

~/Documents/Formation/Moi/Big Data/Logiciels/kafka_2.12-2.4.1

to

~/Documents/Formation/Moi/Logiciels/kafka_binary

and it works (binary sources)

Portmanteau

Answer 8

Try echo $CLASSPATH in the terminal, check if there is a Java in this system. Or maybe you need to install java

Sliding

this should be a comment not an answer @Jacob Jin – Brattishing

This is more of a comment than an answer – Heptarchy

Answer 9

Please check scala version installed in your system. It should be scalaVersion=2.11.12.

Otherwise Download the kafka binary with installed scala version.

Koziara