The book shows how to debug remotely on page 18.
According to https://docs.oracle.com/cd/E19146-01/821-1828/gdabx/index.html
If you substitute suspend=y, the JVM starts in suspended mode and stays 
suspended until a debugger attaches to it.
As the agent startup at the beginning,suspend=y is the better choice.Also, The 
explanation of suspend on this page is unclear.

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