package com.google.protobuf does not exist error while trying to build ProtoBuf Java component

[Prag Thiru]

Previously I was able to run make all and make java. I did a make clean after which make java fails with com/example/tutorial/AddressBookProtos.java:95: error: package com.google.protobuf does not exist.

I followed this SO post, but it fails.

How can I fix this error? Thanks!

examples $protoc --version
libprotoc 3.5.1

examples $make java
make: Nothing to be done for `java'.

examples $make clean
rm -f add_person_cpp list_people_cpp add_person_java list_people_java add_person_python list_people_python
rm -f javac_middleman AddPerson*.class ListPeople*.class com/example/tutorial/*.class
rm -f protoc_middleman addressbook.pb.cc addressbook.pb.h addressbook_pb2.py com/example/tutorial/AddressBookProtos.java
rm -f *.pyc
rm -f protoc_middleman_go tutorial/*.pb.go add_person_go list_people_go
rmdir tutorial 2>/dev/null || true
rmdir com/example/tutorial 2>/dev/null || true
rmdir com/example 2>/dev/null || true
rmdir com 2>/dev/null || true

examples $make java
protoc $PROTO_PATH --cpp_out=. --java_out=. --python_out=. addressbook.proto
javac -cp $CLASSPATH AddPerson.java ListPeople.java com/example/tutorial/AddressBookProtos.java
com/example/tutorial/AddressBookProtos.java:95: error: package com.google.protobuf does not exist
      com.google.protobuf.GeneratedMessageV3 implements
                         ^
com/example/tutorial/AddressBookProtos.java:19: error: package com.google.protobuf does not exist
      com.google.protobuf.MessageOrBuilder {

...

[Feng Xiao]

Try following the instructions in examples/README.md and define CLASSPATH properly:

https://github.com/google/protobuf/tree/master/examples#java

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