It looks like the exception you're observing caused by the following code:
----
public ClassReader(final byte[] b, final int off, final int len) {
this.b = b;
// checks the class version
if (readShort(off + 6) > Opcodes.V1_7) {
throw new IllegalArgumentException();
}
----
It means that the class parser encountered a class file compiled using
bytecode version > 1.7 .
Can you please guess such classes in Ignite classpath and try to rebuild
them with 1.7 "target" version?
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