Created attachment 1089926 [details] Maven project with test case that demonstrates failure. Description of problem: JaxbMarshaller is only storing a single Marshaller and Unmarshaller, which, per Java spec, are not thread-safe classes. This causes a multi-threaded client sending requests to kie-server to throw exceptions due to SaxParser being shared between threads. Version-Release number of selected component (if applicable): BRMS 6.1.4 * kie-server-api-6.2.0.Final-redhat-13 How reproducible: Every time. Steps to Reproduce: 1. Create JaxbMarshaller. 2. Invoke marshall (or unmarshall) from multiple threads. Actual results: An exception will be thrown if parsers overlap. Expected results: All inputs should unmarshall or marshall, respectively. Additional info: This has been fixed in upstream[1] under DROOLS-733, just needed to be merged in. If all changes from that commit are not wanted, then atleast the JAXB Marshaller/Unmarshaller instances must be created on demand to thread safety concerns. [1]: https://github.com/droolsjbpm/droolsjbpm-integration/commit/c4ea208dbee4778188609a9aa605e8d9dca412f8
The linked commit is already included in the upcoming product 6.2 release. Closing the ticket as CURRENT_RELEASE. If this was meant for a different version, please clarify and reopen the ticket.