Package accessible from more than one module: <unnamed>

java jakarta-ee jmx java-platform-module-system
Evandro Pomatti picture Evandro Pomatti · Apr 29, 2019 · Viewed 8.7k times · Source

When trying to register an MBean in JMX Console I'm getting the following error message:

The package javax.management is accessible from more than one module: <unnamed>, java.management

I'm using Eclipse and I have no module-info.java file in my project structure.

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The error disappear when I comment my dependency for Java EE API, but the javax.management package is not part of the JAR.

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Answer

Pro picture Pro · Oct 8, 2019

I experienced similar issue when updating from java 8 to java 11. Steps below helped me,

  • Right click Eclipse project > Properties > Java Build Path
  • In Libraries tab, remove all the external jar files under Modulepath and add them under Classpath (you can just select all the jars and drag them under Classpath)
  • Click Apply and Close

Note: JRE System Library will remain under Modulepath.

Eclipse version: 2019-09

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