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PortInUse Exception in SerialDemo

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# 1  
Old 11-27-2012
PortInUse Exception in SerialDemo
Using JRE 1.4.2_12 on SCO OpenServer 5.0.7, I was able to use the Java Comm Api to open and close serial ports. After upgrading to JRE 1.4.2_19, the Java Comm Api complains that the ports are in use. Does anyone have any thoughts on how to make 1.4.2_19 work with Java Comm API?
FYI. I was using the SerialDemo java program as a test.

Thanks in advance.
# 2  
Old 11-30-2012
After further testing, I am able to open the Serial Port while logged in as root, but not logged in as a user. Any help would be appreciated.
Thanks.
# 3  
Old 11-30-2012
This may be file permissions, check the permissions on the device file itself.
# 4  
Old 11-30-2012
I changed the owner to the user logged in.
I changed the group to a group that user has access to.
The permissions read crw-rw-rw-
No luck.

Also, I no longer believe this is a java issue. I did a fresh install of sco using java 1.4.2_12 and have the same behavior.
# 5  
Old 11-30-2012
Quote:
Originally Posted by rkelly
I changed the owner to the user logged in.
I changed the group to a group that user has access to.
What about the JVM, which their program techically runs inside?
# 6  
Old 12-03-2012
Thanks Corona but I guess I am not as familiar with SCO as I should be. How would I go about changing the permissions for the JVM? Is it simply a matter of finding the .exe file and changing it's permissions?

---------- Post updated at 07:36 AM ---------- Previous update was at 07:26 AM ----------

As a follow-up, I tried changing the permissions on /opt/java2-1.4.2/bin/java using chmod 777 java. That did not fix it.
Thanks.
# 7  
Old 12-03-2012
777 is not the magic sledgehammer to fix all permissions problems. You really need to change that back to what it was before someone accidentally edits the java binary. Smilie

What you did would not have fixed the problem even if the problem is the permissions of the Java runtime environment.

The question is, what user/group/permissions does the JVM run under?
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