Add classpath for java example Makefile

examples/Makefile

@@ -51,7 +51,7 @@ list_people_gotest: list_people.go list_people_go
 	go test list_people.go list_people_test.go
 
 javac_middleman: AddPerson.java ListPeople.java protoc_middleman
-	javac AddPerson.java ListPeople.java com/example/tutorial/AddressBookProtos.java
+	javac -cp ../java/core/target/*.jar AddPerson.java ListPeople.java com/example/tutorial/AddressBookProtos.java
 	@touch javac_middleman
 
 add_person_java: javac_middleman

examples/README.txt

@@ -28,6 +28,13 @@ These examples are part of the Protocol Buffers tutorial, located at:
 "-lpthread" from the linker commands (perhaps replacing it with something else).
 We didn't do this automatically because we wanted to keep the example simple.
 
+## Java ##
+
+protobuf-java-*.jar can be generated by:
+  cd ../java
+  mvn package
+and will be used by "make java"
+
 ## Go ##
 
 The Go example requires a plugin to the protocol buffer compiler, so it is not