java - how to recompile the 3rd party jars using lower version -

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i stuck issue because of lower version of java. using eclipse, set compiler level 1.5 version , using jars

  1. ojdbc.jar
  2. jxl.jar

but throwing following error. suspecting jars compiled higher version may thats reason error.

java.lang.unsupportedclassversionerror: bad version number in .class file     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclass(unknown source)     @ java.security.secureclassloader.defineclass(unknown source)     @ java.net.urlclassloader.defineclass(unknown source)     @ java.net.urlclassloader.access$100(unknown source)     @ java.net.urlclassloader$1.run(unknown source)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(unknown source)     @ java.lang.classloader.loadclass(unknown source)     @ sun.misc.launcher$appclassloader.loadclass(unknown source)     @ java.lang.classloader.loadclass(unknown source)     @ java.lang.classloader.loadclassinternal(unknown source) exception in thread "main"

please let me know how recompile 3rd party jars lower version. or other solution or issue.

jxl.jar culprit. may latest version compiled on 1.7 + version

http://sourceforge.net/projects/jexcelapi/files/jexcelapi/2.6.9%20%28java%201.4%29

i download jar compiled 1.4 version of java. safe on 1.5 version :) :)


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