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classnames.properties generates automatically during project build (using org.apache.ignite.tools.classgen.ClassesGenerator),
but to have correct list during testing developer should:
1) run maven command:
mvn clean package -DskipTests
2) replace classnames.properties (at sources) with generated classnames.properties (at target/classes/META-INF).
Manual addition of new classes to classnames.properties also possible but not recomended.