I would say speed of C++ compared to Java is a very debatable issue,
. There are also other
considerations like the speed of development, the potential of bugs,
and the size of the Java ecosystem and developer community to be taken
IMHO performance is not the biggest issue in Java, consider that a big
number of databases are written in Java also (Cassandra, HBase etc
etc) that perform very well.
I would say the biggest thing to keep an eye on is the Garbage
Collection in high performance applications. It is both a blessing for
normal applications, but a non-deterministic element under certain
circumstances that needs to be monitored and tweaked.
That said - I am not allowed to write any production-critical code on
Neo4j, so take my answer with a grain of salt :)
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