How do I properly parse atlassian jira or confluence logs with splunk?

It seems that Splunk (4.3.1) does not properly parse atlassian log4j logs:

• component is not recognized
• log level is not always recognizes.

I am very new to splunk, evaluating it and I got lost in the configuration options.

How do I teach splunk to properly parse these logs?

I want to be able to filter messages based on component, log level and even be able to ignore certain message patters.

Here is a sample

2012-04-11 10:56:25,473 http-8080-Processor19 ERROR [bc.issue.search.AbstractIssuePickerSearchProvider] Error while executing search request

org.apache.lucene.search.BooleanQuery$TooManyClauses at org.apache.lucene.search.BooleanQuery.add(BooleanQuery.java:184) at org.apache.lucene.search.BooleanQuery.add(BooleanQuery.java:175) at org.apache.lucene.search.PrefixQuery.rewrite(PrefixQuery.java:52) at org.apache.lucene.search.BooleanQuery.rewrite(BooleanQuery.java:381) at org.apache.lucene.search.BooleanQuery.rewrite(BooleanQuery.java:396)