See 'General layout' section, description comments for bytes 6 and 7 In other words, the runtime (major.minor 48) does not support major.minor 49. You are trying to run in a system that has Java 1.4 (major.minor 48) a Java class file that was compiled under Java 1.5 (major.minor 49), thus the error message: Java API to find out the JDK version a class file is compiled for?Р”Р€) Use the following table to map the versions:Р”Р‡or this example, there are 2 items to map:Р”Р„) Runtime Java version 1.4.x => major.minor is 48.0Р”В«) Java class file shows 'version 49.0', but it should be interpreted as: major.minor 49.0 => Java 1.5 You could compile and use the sample Java program mentioned in this article:.

Javap -verbose JavaClassName | findstr minor Javap -verbose JavaClassName | findstr major Javap -verbose JavaClassName | grep minor Javap -verbose JavaClassName | grep major If the file is called JavaClassName.class, do NOT specify the *.class when invoking this tool:

For other operating systems, you can use the Java simple dis-assembler utility 'javap' which is included with the Java SDK (but not included with the Java JRE).

MQSample.class: cafe babe compiled Java class data, version 49.0

If using Linux, you can use the command 'file' to find out the version of Java used to compile the Java class file that you are trying to run, for example:.

There are several different ways to do this depending on the environment. Java 2 Runtime Environment, Standard Edition (build 1.4.2)Р”Сћ) Check the version of Java used to compile the Java class file that you are trying to run. To determine if the runtime Java supports the level of Java with which the program was compiled, follow these steps:Р”Р‡or example, the output might look like this: Thus, the runtime Java 1.4 does not support running this program that was compiled with Java 1.5.

For the specific sample in this technote, the problem is that the executable was compiled with Java 1.5 (major 49) but the runtime is older, such as Java 1.4 (major.minor 48.0).

Java 51.0