Another Tomcat/PermGen nightmare; Tomcat won't start

i've gotten PermGen out of space errors in the past and would just restart tomcat to fix it. but now Tomcat won't start at all. it's tomcat 5.5

Exception: java.lang.OutOfMemoryError: PermGen space
Exception: null
Exception in thread "http-8080-Processor15" java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8080-Processor17" java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8080-Processor22" java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8080-Processor16" java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8080-Processor20" java.lang.OutOfMemoryError: PermGen space
Exception: java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8080-Processor21" java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8080-Processor24" java.lang.OutOfMemoryError: PermGen space
java.lang.ClassNotFoundException: org.apache.catalina.startup.Catalina
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        at org.apache.catalina.startup.Bootstrap.init(Bootstrap.java:222)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:410)

here's the output when i try to start tomcat

  cygwin=false
+ os400=false
+ darwin=false
+ case "uname" in
++ uname
+ '[' -z /usr/share/tomcat5 ']'
+ JAVADIR=/usr/share/java
+ PRG=/usr/bin/dtomcat5
+ '[' -h /usr/bin/dtomcat5 ']'
++ dirname /usr/bin/dtomcat5
+ PRGDIR=/usr/bin
+ '[' -z /usr/share/tomcat5 ']'
+ '[' -r /usr/share/tomcat5/bin/setenv.sh ']'
+ false
+ false
+ '[' -z /usr/share/tomcat5 ']'
+ '[' -z /usr/java/jdk1.6.0_20 ']'
+ _RUNJAVA=/usr/java/jdk1.6.0_20/bin/java
+ _RUNJAVAC=/usr/java/jdk1.6.0_20/bin/javac
+ _RUNJDB=/usr/java/jdk1.6.0_20/bin/jdb
+ CLASSPATH=/usr/java/jdk1.6.0_20/lib/tools.jar
+ '[' -n '' ']'
+ '[' -r /usr/share/java/jsse/jcert.jar ']'
++ /usr/bin/build-classpath mx4j/mx4j-impl
++ /usr/bin/build-classpath mx4j/mx4j-jmx
+ CLASSPATH=/usr/java/jdk1.6.0_20/lib/tools.jar:/usr/share/tomcat5/bin/bootstrap.jar:/usr/share/tomcat5/bin/commons-logging-api.jar:/usr/share/java/mx4j/mx4j-impl.jar:/usr/share/java/mx4j/mx4j-jmx.jar
+ '[' -z '' ']'
+ CATALINA_BASE=/usr/share/tomcat5
+ '[' -z '' ']'
+ CATALINA_TMPDIR=/usr/share/tomcat5/temp
+ have_tty=0
++ tty
+ '[' /dev/pts/0 '!=' 'not a tty' ']'
+ have_tty=1
+ '[' -z '' ']'
+ export CATALINA_PID=/var/run/tomcat5.pid
+ CATALINA_PID=/var/run/tomcat5.pid
+ false
+ '[' -r /usr/share/tomcat5/bin/tomcat-juli.jar ']'
+ JAVA_OPTS='-Xms128m -Xmx256m -XX:PermSize=512m -XX:MaxPermSize=512m -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file=/usr/share/tomcat5/conf/logging.properties'
+ '[' 1 -eq 1 ']'
+ echo 'Using CATALINA_BASE:   /usr/share/tomcat5'
Using CATALINA_BASE:   /usr/share/tomcat5
+ echo 'Using CATALINA_HOME:   /usr/share/tomcat5'
Using CATALINA_HOME:   /usr/share/tomcat5
+ echo 'Using CATALINA_TMPDIR: /usr/share/tomcat5/temp'
Using CATALINA_TMPDIR: /usr/share/tomcat5/temp
+ '[' start = debug -o start = javac ']'
+ echo 'Using JRE_HOME:       /usr/java/jdk1.6.0_17'
Using JRE_HOME:       /usr/java/jdk1.6.0_17
+ '[' start = jpda ']'
+ '[' start =开发者_JAVA百科 debug ']'
+ '[' start = run ']'
+ '[' start = start ']'
+ shift
+ touch /usr/share/tomcat5/logs/catalina.out
+ '[' '' = -security ']'
+ /usr/java/jdk1.6.0_20/bin/java -Xms128m -Xmx256m -XX:PermSize=512m -XX:MaxPermSize=512m -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file=/usr/share/tomcat5/conf/logging.properties -Djava.endorsed.dirs= -classpath /usr/java/jdk1.6.0_20/lib/tools.jar:/usr/share/tomcat5/bin/bootstrap.jar:/usr/share/tomcat5/bin/commons-logging-api.jar:/usr/share/java/mx4j/mx4j-impl.jar:/usr/share/java/mx4j/mx4j-jmx.jar -Dcatalina.base=/usr/share/tomcat5 -Dcatalina.home=/usr/share/tomcat5 -Djava.io.tmpdir=/usr/share/tomcat5/temp org.apache.catalina.startup.Bootstrap start
+ '[' '!' -z /var/run/tomcat5.pid ']'
+ echo 3662 

I think my JAVA_OPTS look ok, but it's still not starting. does anyone see a problem... thanks