java.lang.IllegalArgumentException: error at ::0 formal unbound in pointcut

Don't use "and" operator to link aspect designators. In Java you can use the "&&" operator. "and" is only available in XML.

@Pointcut("execution(* springdemo2."
    + "Thinker.thinkOfSomething(String)) and args(thoughts)")

should be

@Pointcut("execution(* springdemo2."
    + "Thinker.thinkOfSomething()) && args(thoughts)")

@Before("thinking(thoughts)")

should be

@Before("thinking(String) && args(thoughts)")

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