[CentOS] Problem with java-1.5.0 from c4-testing

# rpm -qa java*
java-1.5.0-centos-jdbc-1.5.0.06-1.i386
java-1.5.0-centos-devel-1.5.0.06-1.i386
java-1.5.0-centos-1.5.0.06-1.i386

% java
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object

% ls -l /usr/bin/java
lrwxrwxrwx  1 root root 22 Jan 30 16:12 /usr/bin/java -> /etc/alternatives/java
% ls -l /etc/alternatives/java
lrwxrwxrwx  1 root root 38 Jan 30 16:12 /etc/alternatives/java ->
/usr/lib/jvm/jre-1.5.0-centos/bin/java

I must be missing something obvious.