Just spent a bit figuring this one out myself. CentOS5 installs with an open source JRE alternative (libgcj) which is overriding your Java JRE installation.
If you haven't yet installed the Java JRE, get the RPM here: http://www.java.com/en/download/manual.jsp
Install that, then manually relink /usr/bin/java to the new binary, which should be here: /usr/java/jre1.6.0_05/bin/java
To relink: ln -sf /usr/java/jre1.6.0_05/bin/java /usr/bin/java
Then try to start solr again and it should work.
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