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Date: Sat, 13 Aug 2005 12:54:02 -0500
From: James Andersen <lorinho99@gmail.com>
To: jcs-users@jakarta.apache.org
Subject: NullPointerExceptions with JCS.getInstance
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I've got high hopes for using JCS in my webapp, it looks like it will
make a great addition but I've been spinning my wheels fruitlessly for
several hours now trying to get it working...

I've got jcs-1.2.6.5.jar in tomcat's common/lib directory and the
following simplest possible cache.ccf file in WEB-INF/classes/ of my
webapp directory
-----------------------------------
# DEFAULT CACHE REGION  =20

jcs.default=3D
jcs.default.cacheattributes=3Dorg.apache.jcs.engine.CompositeCacheAttribute=
s
jcs.default.cacheattributes.MaxObjects=3D1000
jcs.default.cacheattributes.MemoryCacheName=3Dorg.apache.jcs.engine.memory.=
lru.LRUMemoryCache
-------------------------

However, on startup, when execution reaches
JCS.getInstance("pageCache"), this NPE is thrown.
---------------------------
java.lang.NullPointerException
=09at java.util.Properties$LineReader.readLine(Unknown Source)
=09at java.util.Properties.load(Unknown Source)
=09at org.apache.jcs.engine.control.CompositeCacheManager.configure(Composi=
teCacheManager.java:168)
=09at org.apache.jcs.JCS.ensureCacheManager(JCS.java:105)
=09at org.apache.jcs.JCS.getInstance(JCS.java:64)
=09at org.jandersen.bliki.dao.PGWikiBackend.<init>(PGWikiBackend.java:41)
=09etc...
-------------------------------
any subsequent page requests yield a slightly different variation:
--------------------------
java.lang.NullPointerException
=09at org.apache.jcs.config.OptionConverter.findAndSubst(OptionConverter.ja=
va:252)
=09at org.apache.jcs.config.OptionConverter.instantiateByKey(OptionConverte=
r.java:147)
=09at org.apache.jcs.engine.control.CompositeCacheConfigurator.parseElement=
Attributes(CompositeCacheConfigurator.java:317)
=09at org.apache.jcs.engine.control.CompositeCacheConfigurator.parseRegion(=
CompositeCacheConfigurator.java:216)
=09at org.apache.jcs.engine.control.CompositeCacheConfigurator.parseRegion(=
CompositeCacheConfigurator.java:201)
=09at org.apache.jcs.engine.control.CompositeCacheManager.getCache(Composit=
eCacheManager.java:303)
=09at org.apache.jcs.engine.control.CompositeCacheManager.getCache(Composit=
eCacheManager.java:266)
=09at org.apache.jcs.engine.control.CompositeCacheManager.getCache(Composit=
eCacheManager.java:259)
=09at org.apache.jcs.JCS.getInstance(JCS.java:66)
=09at org.jandersen.bliki.dao.PGWikiBackend.<init>(PGWikiBackend.java:41)
=09etc...
------------------------------
I feared at one point that I couldn't call
JCS.getInstance("pageCache") without having a pageCache region so I
tried using a copy of the cache.ccf file based on the "Basic Web
Example" from the site changing only "bookCache" to "pageCache" but
that didn't make any difference regarding this error.
I even tried a different java version (the above was with jre1.5.0_04)
and got this variation of the NPE when I ran tomcat 5.0.19 with j2sdk
1.4.2_09
------------------------------------
java.lang.NullPointerException
=09at java.io.Reader.<init>(Reader.java:61)
=09at java.io.InputStreamReader.<init>(InputStreamReader.java:80)
=09at java.util.Properties.load(Properties.java:266)
=09at org.apache.jcs.engine.control.CompositeCacheManager.configure(Composi=
teCacheManager.java:168)
=09at org.apache.jcs.JCS.ensureCacheManager(JCS.java:105)
=09at org.apache.jcs.JCS.getInstance(JCS.java:64)
=09at org.jandersen.bliki.dao.PGWikiBackend.<init>(PGWikiBackend.java:41)
=09etc.........
------------------------------------

I'm a big fan of the jakarta projects can anyone shed some light on
how to fix this?  I noticed someone had a similar problem when trying
to use the remote auxiliary...  I'm just shooting for the simplest use
scenario.  If I read the posts correctly, the only way they solved the
problem was by patching CompositeCacheManager...

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