Disk Cache returns wrong object for key
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Key: JCS-31
URL: https://issues.apache.org/jira/browse/JCS-31
Project: JCS
Issue Type: Bug
Components: Indexed Disk Cache
Affects Versions: jcs-1.3
Environment: Java(TM) 2 Runtime Environment, Standard Edition (build
1.5.0_11-b03)
Java HotSpot(TM) Server VM (build 1.5.0_11-b03, mixed mode)
Linux
Reporter: Matt Wiseley
Assignee: Aaron Smuts
The Indexed Disk Cache returns the incorrect object for a specified key if the
disk cache is accessed by a second JVM. Here is the scenario:
1. Start Tomcat with an app that uses JCS with Disk Cache.... get some stuff
stored in the disk cache.
2. Start another JVM (say, a command line program) that includes the same
cache.ccf file in its class path.
3. Upon exit of the 2nd JVM, the disk cache is cleared.
4. The JCS in the Tomcat JVM appears to be unaware of this and will start
returning wrong (but seemingly valid) data for key requests.
I noticed this when my web application started displaying the wrong page for a
request. In my case, this was a HUGE security problem, and it took me a long
time to figure out this is why it was happening. But I've been able to reliably
reproduce this scenario.
I understand that the disk cache isn't meant to be accessed by multiple JVMs
and shouldn't be, but to allow this behavior to quietly happen is very
dangerous. There needs to be some kind of locking mechanism or error thrown to
ensure this doesn't happen by accident (as it was in my case).
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