Spring Boot Tomcat and JVM Optimization, Remote Debugging, and JConsole/JVisualVM Remote Connection Guide

Spring Boot web projects use an embedded Tomcat server by default, which can also be switched to Jetty; the embedded approach simplifies micro‑service deployment and eliminates the need to download external servers.

Key optimization points include configuring thread numbers, connection timeout, and JVM settings to improve stability and performance under load.

In application.yml you can set Tomcat parameters as follows:

server:
  tomcat:
    min-spare-threads: 20
    max-threads: 100
  connection-timeout: 5000

JVM optimization typically involves using the -server mode and adjusting heap sizes with -Xms and -Xmx . Example launch commands:

java -server -jar springboot-1.0.jar

java -server -Xms512m -Xmx768m -jar springboot-1.0.jar

For remote debugging, start the application with debug options:

java -Djavax.net.debug=ssl -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8888 -jar springboot-1.0.jar

After launching, configure IDEA's Remote Debug configuration (set project name, IP address, and port) and ensure the server firewall allows the connection.

To monitor the JVM remotely with JConsole or JVisualVM, first verify the server's hostname using hostname -i , update /etc/hosts to map the correct IP, and restart the server. Then start the Java process with JMX options:

java -jar -Djava.rmi.server.hostname=192.168.44.128 \
    -Dcom.sun.management.jmxremote \
    -Dcom.sun.management.jmxremote.port=911 \
    -Dcom.sun.management.jmxremote.ssl=false \
    -Dcom.sun.management.jmxremote.authenticate=false \
    jantent-1.0-SNAPSHOT.jar

Open JConsole, enter the IP and port (e.g., 192.168.44.128:911) to connect; the same parameters work for JVisualVM, providing richer monitoring capabilities.

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