StringTemplate version: 4.3.1

I'm migrating a web application from Tomcat 7 to Tomcat 8. It appears something in the class loader behavior has changed between the versions.

My app calls STGroupDir group = new STGroupDir("com/example/app/path/to/templates");

When running on Tomcat 7, after the line root = cl.getResource(dirName); at STGroupDir.java:72 the variable root has the value

jar:file:/path/to/exploded/app/WEB-INF/lib/my-component.jar!/com/example/app/path/to/templates

Running on Tomcat 8, root has the value

jar:file:/path/to/exploded/app/WEB-INF/lib/my-component.jar!/com/example/app/path/to/templates/

My app then calls ST st = group.getInstanceOf("/TemplateGroup/someTemplate"); to load someTemplate from ...path/to/templates/TemplateGroup.stg.

When load() calculates groupFileURL on line STGroupDir.java:128, the value is

jar:file:/path/to/exploded/app/WEB-INF/lib/my-component.jar!/com/example/app/path/to/templates//TemplateName.stg

The double slash prevents it from successfully loading the template group file, and getInstanceOf() returns null.