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Java Versions And Running Programs
Java Versions And Running Programs

Version management

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!!Java Versions
We compiled most of the programs with 1.5.0_11 and have tested most with 1.7.0.
*Many programs will NOT work with 1.4 or earlier.
*Very few will work with 1.3.
If you get an error similar to:
{{{java.lang.UnsupportedClassVersionError: .... (Unsupported major.minor version 49.0)}}}
You will need to be sure you are using at least Java 1.5.
You can retrieve the JVM Version of java you are running by typing:
{{{java -version}}}
Java bytecode version represents the format used for the class files. The bytecode version allow JVMs to verify that the class file is loadable. Every JVM has a maximum version it can load, and JVMs will reject class files with later versions. The "java.lang.UnsupportedClassVersionError" is thrown when the JVM is attempting to load a class file format (bytecode version) that the JVM is unable to support.
We found a good list for checking [byteCode Versions|Wikipedia:Java_class_file|target='_blank']
The following table gives the bytecode versions that will run on a particular JVM version, as listed by Sun or determined by experiment.
||Bytecode Version||JVM Version||Source
|45.0 - 45.3|1.0.2|Sun
|45.0 - 45.65535|1.1.*|Sun
|45.0 - 46.0|1.2|Sun; experiment suggests that some 1.2 JVMs also support 46.3
|45.0 - 47.0|1.3|Experiment
|45.0 - 48.0|1.4|Experiment
|45.0 - 49.0|5 (1.5)|Experiment
The system property "java.class.version" determines the Maximum version the JVM supports. The following table shows the "java.class.version" for each version of the JVM:
* 1.1 = <45.3>
* 1.2 = <46.0>
* 1.3 = <47.0>
* 1.4 = <48.0>
* 1.5 = <49.0>
* 1.6 = <50.0>
* 1.7 = <51.0>
* 1.8 = <52.0>
So if a class file has a bytecode format of 49.0 and it is attempted to run on a 1.4 JVM, you will get a error like:
{{{java.lang.UnsupportedClassVersionError: .... (Unsupported major.minor version 49.0)}}}
Which implies that the JVM is not able to support a bytecode format of 49.0.
!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
This page (revision-1) was last changed on 29-Nov-2024 16:16 by UnknownAuthorTop