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.

Is it resolved for you, cause I'm getting the same error, I'm using ubuntu 16.04 — nitinsridar, Sep 09 '18 at 05:59
because of some issues with my machine i freshly set up Ubuntu and now after that it worked following the standard tutorial — Andreas bleYel, Dec 18 '19 at 12:40

score 44 · Answer 1 · answered Aug 02 '18 at 04:01

44

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.

answered Aug 02 '18 at 04:01

Mideel

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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' – nitinsridar Sep 09 '18 at 05:59
2

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! – Babajide M. Moibi Oct 01 '18 at 08:06
2

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! – Aryan Venkat Jan 30 '19 at 12:03
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. – Abhiruka Feb 19 '23 at 11:55

score 19 · Answer 2 · edited Nov 15 '18 at 22:05

19

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/

edited Nov 15 '18 at 22:05

JJJ

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answered May 14 '18 at 07:45

shahidammer

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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. – Andreas bleYel May 15 '18 at 07:22

score 15 · Answer 3 · answered Apr 03 '19 at 21:11

15

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

answered Apr 03 '19 at 21:11

Amar

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Go to https://kafka.apache.org/downloads and choose most suitable version – Rajitha Fernando Feb 19 '20 at 07:25

score 4 · Answer 4 · answered Mar 12 '20 at 20:11

4

Go to your terminal and run:

$ ./gradlew jar -PscalaVersion=2.11.12

answered Mar 12 '20 at 20:11

Ferds

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this has to be executed inside de donwloaded folder – Mikel Jun 16 '22 at 09:33

score 4 · Answer 5 · answered Jun 14 '20 at 10:39

4

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

answered Jun 14 '20 at 10:39

Dima Myroniuk

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score 4 · Answer 6 · edited Jan 29 '21 at 04:28

4

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.

edited Jan 29 '21 at 04:28

Mahyar Mottaghi Zadeh

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answered Jan 28 '21 at 13:54

Dave

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score 2 · Answer 7 · edited Mar 28 '20 at 11:24

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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)

edited Mar 28 '20 at 11:24

David Buck

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answered Mar 28 '20 at 10:57

YAO ALEX DIDIER AKOUA

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score 1 · Answer 8 · answered Dec 13 '18 at 10:30

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

answered Dec 13 '18 at 10:30

Jacob Jin

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this should be a comment not an answer @Jacob Jin – HamzaNig Dec 13 '18 at 10:37
This is more of a comment than an answer – Gihan Saranga Siriwardhana Dec 13 '18 at 10:51

score 0 · Answer 9 · answered Jul 11 '18 at 07:20

0

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

Otherwise Download the kafka binary with installed scala version.

answered Jul 11 '18 at 07:20

panwar001

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

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