Clearing Java Objects

My code uses Java objects that I created and provide to ML in a .jar file.

After my code terminates, I try to run "clear java" and I get a message back that some of my objects still exist and Java cannot be cleared:

Warning: Objects of Param/TableCellRenderer class exist - not clearing java Warning: Objects of Param/RowHeaderRenderer class exist - not clearing java

How can I clear these objects? The only way that I have found is to restart ML. Not fun when co-developing between ML and Java.

[Kaustubha Govind]

The documentation suggests "If any Java objects exist outside the workspace (for example, in user data or persistent variables in a locked code file), clear issues a warning and does not remove the Java class definition." - is this the case with your Java class?

[Joseph Burgel]

Hi Kaustubha,

No, that's not the case. As and experiment, I removed my .jar file from the Java dynamic class path and added it to the static class path by modifying classpath.txt and re-starting Matlab. Guess what...the problem went away. So, this problem lies in the fact that ML is not properly de-referencing java objects on the dynamic classpath. Or, some aspect of my .java code is causing it not to be properly de-referenced when it's on the dynamic classpath. I have other java objects that don't have this problem and work fine on the dynamic path. Can anyone shed some light on why this might be. Thanks.

[Kaustubha Govind]

Interesting problem. You might want to consider contacting Tech Support to see if they've seen this before.

Answer 1

[Joseph Burgel]

As an experiment, I removed my .jar file from the Java dynamic class path and added it to the static class path by modifying classpath.txt and re-starting Matlab. Guess what...the problem went away. So, this problem lies in the fact that ML is not properly de-referencing java objects on the dynamic classpath. Or, some aspect of my .java code is causing it not to be properly de-referenced when it's on the dynamic classpath. I have other java objects that don't have this problem and work fine on the dynamic path.