If a source file is dated in the future, the following scenario will fail to execute as might be expected
@compile -g Foo
@run main Foo

The initial @compile action is unconditional and will always occur. The second "@run main" action has an implicit "rebuild if necessary" step, which may be invoked unexpectedly if the first action did not generate a class file newer than the corresponding source file.

There is nothing jtreg can do to prevent such a situation, but it would help if it gave a warning altering the user to the situation.