Running Coldfusion 10 on Tomcat 7 (J2EE installation)

I've successfully installed Tomcat 7 on a Macintosh running 10.7.5.  The ColdFusion WAR file deployed successfully, but when I try to start the service, I get a raft of errors in the Catalina.out log file:

INFO: Deploying web application archive /usr/local/Tomcat7/webapps/cfusion.war

java.lang.ExceptionInInitializerError

          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

...

          at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

          at java.lang.Thread.run(Thread.java:680)

Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@36598d00 for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category) (Caused by org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@36598d00 for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category))

          at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)

          at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)

          at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)

          at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)

          at coldfusion.portlet.wsrp.ProviderImpl.<clinit>(ProviderImpl.java:72)

          ... 55 more

Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@36598d00 for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category)

          at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:413)

          at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)

          ... 59 more

Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Category

          at java.lang.Class.getDeclaredConstructors0(Native Method)

          at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)

          at java.lang.Class.getConstructor0(Class.java:2699)

          at java.lang.Class.getConstructor(Class.java:1657)

          at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410)

          ... 60 more

Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Category

          at java.net.URLClassLoader$1.run(URLClassLoader.java:202)

          at java.security.AccessController.doPrivileged(Native Method)

          at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

          at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)

          at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

          at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

          ... 65 more

java.lang.ExceptionInInitializerError

          at java.lang.Class.forName0(Native Method)

I got the same errors when I tried the standalone installer.  Apparently the version of Commons-Logging or Log4J that Coldfusion 10 is expecting isn't the one it's finding?  Does anyone know what this problem is and how to fix it?