1.在%CATALINA_HOME%\bin\catalina.bat中找到

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set "JAVA_OPTS=%JAVA_OPTS% -Djava.protocol.handler.pkgs=org.apache.catalina.webresources"

注释替换为

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set "JAVA_OPTS=%JAVA_OPTS% -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8888 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources"

debug端口为8888

2.在IDEA配置远程debug