Is GenerateRepositoryFacadeMojo thread safe?

[lppedd]

I've just enabled a multithread build and I've been observing the following message.

[WARNING] The following plugins are not marked as thread-safe in com.ibm...:
[WARNING]   org.jboss.tools.tycho-plugins:repository-utils:2.5.0

If it is, could it be marked with the appropriate annotation value?

[lppedd]

There is a shared field in that Mojo.

jbosstools-maven-plugins/tycho-plugins/repository-utils/src/main/java/org/jboss/tools/tycho/sitegenerator/GenerateRepositoryFacadeMojo.java

Line 226 in e786575

private File categoryFile;

Can we at least synchronize the method? I'm up to do the PR.