Having trouble installing the Quartz plugin? Read on...

For those of you who don't follow the grails-users list, I thought I'd post a quick solution to solving an odd-looking compile error when installing the Quartz plugin into a Grails application that also uses the JSecurity plugin.
The compile error you will see is:

GrailsJobFactory.java:75: cannot find symbol
symbol  : constructor JobExecutionException(java.lang.String,java.lang.Exception)
location: class org.quartz.JobExecutionException
    throw new JobExecutionException(e.getMessage(), e);

It's caused by a library clash between the two plugins as JSecurity also ships with quartz.jar. Luckily (according to Les from the JSecurity project), JSecurity doesn't actually rely on that jar so you can delete it from plugins/jsecurity-x.x/lib which will solve the compile issue.