Is this JAX-WS client call thread safe?

Question

Since initialization of the WS client service and port takes ages I like to initialize them once at startup and reuse the same instance of the port. Initalization would look

Answer 1

In general, no.

According to the CXF FAQ http://cxf.apache.org/faq.html#FAQ-AreJAX-WSclientproxiesthreadsafe?

Official JAX-WS answer: No. According to the JAX-WS spec, the client proxies are NOT thread safe. To write portable code, you should treat them as non-thread safe and synchronize access or use a pool of instances or similar.

CXF answer: CXF proxies are thread safe for MANY use cases.

For a list of exceptions see the FAQ.