[TAP5-2364] Tapestry can use prohibited operations in some environments, such as Google App Engine

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.4
• Fix Version/s: 5.4
• Component/s: tapestry-webresources
• Assignee: Howard Lewis Ship
• Reporter: Jonathan Williams
• Created: 31/Jul/14 17:18
• Updated: 01/Aug/14 19:09
• Resolved: 01/Aug/14 15:46

Description

beta15 breaks GAE & some other prod environments
I have a couple of app engine apps that are broken w/ beta15
This is due to use of java.io.File to mkdir, which is prohibited on app engine and is more generally considered a JEE no-no.

...
ResourceTransformerFactoryImpl creates a File for the asset cache directory.
This breaks my app in GAE, since creating a new File is prohibited.

...
it looks like the cache is only used in development
mode but still references File in production (thus breaking GAE). Perhaps a
proper fix will involve a pluggable cache which does nothing in production
mode.

As a workaround you can override the ResourceTransformerFactory via ioc
with an implementation that doesn't reference java.io.File. Most likely a
copy/paste/tweak of the current version.

...
Note, this could also break non GAE environments since it calls mkdirs() on
@Symbol(WebResourcesSymbols.CACHE_DIR). For example a unix server without
write permission.