Bug 40712

Summary:

Warn when compiling for 1.4 against a 1.3 library.

Product:

[Eclipse Project] JDT

Reporter:

John Arthorne <john.arthorne>

Component:

Core

Assignee:

JDT-Core-Inbox <jdt-core-inbox>

Status:

RESOLVED WORKSFORME

QA Contact:

Severity:

normal

Priority:

CC:

markus.kell.r

Version:

3.0

Target Milestone:

3.0 M3

Hardware:

OS:

Windows 2000

Whiteboard:

Attachments:

Description	Flags
Project compiler preferences	none

Description John Arthorne

2003-07-24 10:32:27 EDT

Build: I20030718 (M2)

Trying to evaluate any snippet in a scrapbook in my workspace results in an
UnsupportedClassVersionError.  This is using VM J9SC build 20030624 (without
-Xj9 vm arg).  I don't get any errors with a standard 1.3 VM.  Any ideas?  I can
open a defect against the VM vendor if you think that's where the problem is.  A
trivial snippet (such as "5+5") causes the failure.  Here is the stack:

java.lang.UnsupportedClassVersionError: CodeSnippet_10 (Unsupported major.minor
version 48.0)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:133)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:319)
	at java.net.URLClassLoader.access$400(URLClassLoader.java:92)
	at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:681)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:243)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:448)
	at java.lang.Class.forName1(Native Method)
	at java.lang.Class.forName(Class.java:145)
	at
org.eclipse.jdt.internal.debug.ui.snippeteditor.ScrapbookMain1.eval(ScrapbookMain1.java:21)
	at java.lang.reflect.Method.invoke(Native Method)
	at
org.eclipse.jdt.internal.debug.ui.snippeteditor.ScrapbookMain.evalLoop(ScrapbookMain.java:55)
	at
org.eclipse.jdt.internal.debug.ui.snippeteditor.ScrapbookMain.main(ScrapbookMain.java:33)
	at
org.eclipse.jdt.internal.debug.ui.snippeteditor.ScrapbookMain.evalLoop(ScrapbookMain.java:55)
	at
org.eclipse.jdt.internal.debug.ui.snippeteditor.ScrapbookMain.main(ScrapbookMain.java:33)

Comment 1 Darin Wright

2003-07-24 10:45:58 EDT

I do not see this error (using the VM J9SC build 20030714a). However, could you 
look at your installed JRE definition to see if the problem may be related to 
bug 40673. Is it missing libraries?

Comment 2 Darin Wright

2003-07-24 10:47:10 EDT

This is likely a different problem. What compilation preferences do you have 
for the project the snippet is compiled in? i.e. anything special?

Comment 3 John Arthorne

2003-07-24 10:54:42 EDT

Created attachment 5548 [details]
Project compiler preferences

Comment 4 John Arthorne

2003-07-24 10:57:08 EDT

I've figured it out.  That project had the compiler compliance level set to 1.4,
although I'm using a 1.3 VM.  So I was doing something wrong, but I think there
should have been a better warning somewhere (from the compiler?).

Comment 5 Darin Wright

2003-07-24 11:07:19 EDT

There are two problems - when compiling against 1.3 with 1.4 compliance, there 
should be a compiler error (I will move this bug there). The runtime issue is 
ours - i.e. running 1.4 files against a 1.3 VM (already filed bug 38319).

Comment 6 Philipe Mulet

2003-07-24 11:37:48 EDT

Did you enable the existing warning ?

Preferences > Java > Compiler > Build path > Incompatible Required Binaries

Comment 7 Philipe Mulet

2003-07-25 05:33:31 EDT

Closing, please reopen if suggested warning does not work.

Comment 8 John Arthorne

2003-07-25 10:30:36 EDT

I'm wondering if "Incompatible required binaries" should be a warning by default
instead of ignore.  In my case I just got an obscure failure when running the
program, and it took some investigation and help from Darin to figure out what
was wrong.

Comment 9 Markus Keller

2014-10-06 09:57:00 EDT

More discussions about this warning: bug 390446.