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How to change java version in MyEclipse

Does anyone remember how to change the java version that a project uses to compile classes in MyEclipse?  I'm getting a "unable to access jar file" and then an "invalid or corrupt jar file" message when I try to run my JAR.  I'm guessing that I may have the wrong version number (1.5 instead of 1.4)  in my manifest file.

Your  helps is greatly appreciated

Matt
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matty1stop
Asked:
matty1stop
3 Solutions
 
sanjoozCommented:
in Eclipse

Window > Preferences > Java > Installed JREs
0
 
objectsCommented:
you can also do it Project Properties for a particular project

0
 
formula1actCommented:
Check the installed JREs and also the compiler compliance level in the preferences section
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