Am 02.10.2012 um 21:23 schrieb doug andrews <dandr...@mediaspansoftware.com>:
> Is it possible to deploy an application compiled with java 6 on a machine > running java 1.4? > I have both Java 6 and 4 on my machine. > I have a test application created using the Eclipse ant build while running > java 6. > I force the app to use java 1.4 when deployed by modifying the MacOS class > path file: > > # JVM == > /System/Library/Frameworks/JavaVM.framework/Versions/1.4.2_22/Commands/java > > When I run, I get this error: > java.lang.UnsupportedClassVersionError: > com/webobjects/appserver/WOApplication (Unsupported major.minor version 49.0) > > My java 6 version is: > java version "1.6.0_29" > Java(TM) SE Runtime Environment (build 1.6.0_29-b11-402-11E53) > Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02-402, mixed mode) > > My java 4 version is: > java version "1.4.2_22" > Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_22-b02-329) > Java HotSpot(TM) Client VM (build 1.4.2-92, mixed mode) > > I've tried modifying the build.xml "wocomplile" argument like this: > <wocompile srcdir="Sources" target="1.4" source="1.4" destdir="bin" > fork="yes" memoryMaximumSize="256m" debug="yes"> > but this does not seem to work. > > I'm pretty sure this is possible, but cannot figure out how. No, it's not. There have been class file format modifications, especially from 5 to 6, and Java generally doesn't guarantee downward compatibility with new releases[1]. You can't load those class files on a 1.4 JVM. You have to compile with JDK 1.4 to do that, and if you have generics *anywhere*, you can't do that either. I suggest you get rid of that 1.4 installation. Maik [1] http://www.oracle.com/technetwork/java/javase/compatibility-137541.html _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
