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Java Forum / General / February 2007rmi problems
hi I need help, I'm learning rmi and when trying to run the server code I get an error: Exception in thread "main" java.lang.UnsupportedClassVersionError:srcEcho(Unsupported major.minor version 50.0): at .... at .... at .... and I'm using java 1.3.1_01. What should I do? Thanks > hi I need help, I'm learning rmi and when trying to run the server > code I get an error: [quoted text clipped - 7 lines] > > What should I do? Thanks You are probably using two different versions of Java for compiling / executing. "boyScout" wrote: >> hi I need help, I'm learning rmi and when trying to run the server >> code I get an error: [quoted text clipped - 7 lines] >> >> What should I do? Thanks Java 1.3 is obsolete. Java 1.4 is getting ancient. Java 5 is the previous version. Java 6 is the current version. The class was compiled with a version of Java that uses classfile version 50.0. I am not sure, I leave the Googling to you, but I think that is a class file generated by Java 6. You tried to run it under the obsolete, unsupported Java 1.3 and it failed. Either compile the class with "-target 1.3" or upgrade to a current, non-obsolete version of Java. - Lew sorry I don't understand, last week I installed java 6 and now if i did understand you're trying to tell to install java 5. I'm still confused. Why is my class version of 1.3 when I have java 6. I have both jdk 1.6.0 and jre 1.6.6. I can't understand why it don't work. > sorry I don't understand, last week I installed java 6 and now if i > did understand you're trying to tell to install java 5. No, Lew didn't suggest that, I don't know where you got that idea from. > I'm still > confused. Why is my class version of 1.3 when I have java 6. I have > both jdk 1.6.0 and jre 1.6.6. I can't understand why it don't work. The other way around. Your compiler is Java 6. The JRE you are using to execute the byte-code (maybe either java or rmiregistry if you are using that) is from an older version of Java and cannot use the 50.0 version classfiles.  SignatureNigel Wade, System Administrator, Space Plasma Physics Group, University of Leicester, Leicester, LE1 7RH, UK E-mail : nmw@ion.le.ac.uk Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555 > "boyScout" wrote: >>> hi I need help, I'm learning rmi and when trying to run the server [quoted text clipped - 21 lines] > > - Lew Hmm not true Java 1.4 is geeting ancient - in fact it`s still used in most business projects... Jujo > Hmm not true Java 1.4 is geeting ancient - in fact it`s still used in most > business projects... Both can be true at once ;-) Businesses often like to use the oldest available version of software that still works. So often the most popular version is also ancient... -- chris > hi I need help, I'm learning rmi and when trying to run the server > code I get an error: [quoted text clipped - 7 lines] > > What should I do? Thanks I guess your rmi server needs 1.5 rather than 1.3 Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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