Programming Forums > Application Development > Java

Krista · Dec 6th, 2005, 5:43 PM

I get the following error when trying to run a server sided program. Does anyone know what it means?

Exception in thread "main" java.lang.UnsupportedClassVersionError: CommServer (Unsupported major.minor version 49.0)

at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass0(Unknown Source)
etc.....

I assume it has to do with the version of the .class files...but unsure. How do I go about fixing it if that is the problem...any suggestions?

Thanks

Dameon · Dec 6th, 2005, 6:01 PM

Perhaps the code was compiled using a later/earlier version of Java than is available on the server. Check what version the server is running. If it has the appropriate version available but is using the wrong one, you may need to specifically use the proper java executable.

titaniumdecoy · Dec 6th, 2005, 6:16 PM

Dameon may be right, but you can try adding

(Toggle Plain Text)

private static final long serialVersionUID = 1L;

to certain classes. My compiler is always bugging me with warnings that I should add this line, so try it and see if it does the trick (Apparently the number you supply, 1 in this case, is the version your code is at). Tell me if this works... I have no idea if it will.

Dec 6th, 2005, 5:43 PM	#1
Krista Newbie Join Date: Oct 2005 Posts: 12 Rep Power: 0	...java.lang.UnsupportedClassVersionError..... I get the following error when trying to run a server sided program. Does anyone know what it means? Exception in thread "main" java.lang.UnsupportedClassVersionError: CommServer (Unsupported major.minor version 49.0) at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass0(Unknown Source) etc..... I assume it has to do with the version of the .class files...but unsure. How do I go about fixing it if that is the problem...any suggestions? Thanks Last edited by Krista; Dec 6th, 2005 at 5:46 PM. Reason: more meaningful title

Dec 6th, 2005, 6:01 PM	#2
Dameon Troll Join Date: Apr 2005 Location: Texas Posts: 730 Rep Power: 4	Perhaps the code was compiled using a later/earlier version of Java than is available on the server. Check what version the server is running. If it has the appropriate version available but is using the wrong one, you may need to specifically use the proper java executable. __________________ MD5(sig) = bcef75433db02e9ad9bf81d6f7c5c270

Dec 6th, 2005, 6:16 PM	#3
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 836 Rep Power: 3	Dameon may be right, but you can try adding (Toggle Plain Text) private static final long serialVersionUID = 1L; private static final long serialVersionUID = 1L; to certain classes. My compiler is always bugging me with warnings that I should add this line, so try it and see if it does the trick (Apparently the number you supply, 1 in this case, is the version your code is at). Tell me if this works... I have no idea if it will.

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Programming Forums > Application Development > Java

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