Re: [Py4j-users] getting the java gateway to unblock after method call

[Barthelemy D. <ba...@cs...>]

Hi Aaron,

Sorry for the delay!

First, make sure that the java method is indeed blocking. For example, try
to get the return value and print it on the python side. Even if the
method is void on the Java side, Python will receive a None (there is no
"void" in Python).

Second, there are two workarounds. Py4J is multi-threaded so you could
create multiple threads on the python side and, using the same gateway
instance, call multiple blocking Java methods. This is the way to go if
you have only a few, short blocking calls.

The other workaround is on the Java side: you need to make the method
non-blocking, e.g., by launching the app in a thread.

Hope this helps,
Barthélémy

On Wed, December 28, 2011 2:56 pm, Aaron Elder wrote:
> I have a method on the java side that launches a java app. If I call this
> java method from the python side, the app launches properly, but I am not
> able to call any further java methods from the python side. I assume the
> gateway is blocking because it thinks the first method called has not
> finished execution.What is the recommended way to work around this?
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