<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>KeepAlive</key>
<dict/>
<key>Label</key>
<string>org.apache.tomcat</string>
<key>ProgramArguments</key>
<array>
<string>/bin/sh</string>
<string>/Library/Tomcat/bin/catalina.sh</string>
<string>run</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>KeepAlive</key>
<dict/>
<key>Label</key>
<string>org.apache.tomcat</string>
<key>ProgramArguments</key>
<array>
<string>/bin/sh</string>
<string>/Library/Tomcat/bin/catalina.sh</string>
<string>run</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
The trick is to run the catalina.sh script with the run option so it does not detach.