If the server is installed into a directory containing a '+' (plus sign), it fails to start up:

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JBoss Bootstrap Environment

JBOSS_HOME: /tmp/JBoss+AS/jboss-5.1.0.GA

JAVA: /home/jdc/jdk1.6.0_12/bin/java

JAVA_OPTS: -Dprogram.name=run.sh -server -Xms128m -Xmx512m -XX:MaxPermSize=256m -Dorg.jboss.resolver.warning=true -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -Djava.net.preferIPv4Stack=true

CLASSPATH: /tmp/JBoss+AS/jboss-5.1.0.GA/bin/run.jar:/home/jdc/jdk1.6.0_12/lib/tools.jar

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Failed to boot JBoss:
java.lang.ClassNotFoundException: org.jboss.bootstrap.microcontainer.ServerImpl
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:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at org.jboss.bootstrap.ServerLoader.createServer(ServerLoader.java:359)
at org.jboss.bootstrap.ServerLoader.load(ServerLoader.java:336)
at org.jboss.Main.boot(Main.java:215)
at org.jboss.Main$1.run(Main.java:556)
at java.lang.Thread.run(Thread.java:619)