JDK 1.5.0 "java -jar ..." can no longer read some jar files created by
Info-Zip's zip command.

See self-explanatory shell transcript below:

 $ echo 'class Test {public static void main(String[] args) {}}' > Test.java && mkdir -p META-INF && (echo Manifest-Version: 1.0; echo Main-Class: Test) > META-INF/MANIFEST.MF && jver 1.4.2 javac Test.java && zip -q z.jar META-INF/MANIFEST.MF Test.class ; for v in 1.4.2 1.5.0 6.0; do echo $v; jver $v java -jar z.jar; done
1.4.2
1.5.0
Invalid or corrupt jarfile z.jar
6.0
Invalid or corrupt jarfile z.jar