Hello,
If VM starts without -Xverify option it thwows ClassFormatError instead of
UnsupportedClassVersionError
when class contains incorrect Major version number.
But Harmony-r548657 throws correct UnsupportedClassVersionError in both cases
(with or without -Xverify).
RI always throws UnsupportedClassVersionError for such incorrect class.
To reproduce use the following test and synthetic class v1
----------------test.java--------------
import java.io.*;
public class test {
public static void main(String[] args) {
try {
Class.forName("v1");
System.err.println("Test failed: UnsupportedClassVersionError was
not thrown");
} catch (UnsupportedClassVersionError e) {
System.err.println("Test passed: "+e);
} catch (Throwable e) {
System.err.println("Test failed: unexcpected error");
e.printStackTrace();
}
}
}
-----------------------v1.ccode----------------
magic = xCAFEBABE
minor_version = 3
major_version = 450 // wrong major version
constant_pool_count = 13
constant_pool {
/* #1 */ Method = #12 #7
/* #2 */ Class = #11
/* #3 */ UTF8 = "java/lang/Object"
/* #4 */ UTF8 = "SourceFile"
/* #5 */ UTF8 = "<init>"
/* #6 */ UTF8 = "v1.ccode"
/* #7 */ NameAndType = #5 #10
/* #8 */ UTF8 = "Code"
/* #9 */ UTF8 = "test"
/* #10 */ UTF8 = "()V"
/* #11 */ UTF8 = "v1"
/* #12 */ Class = #3
}
access_flags = PUBLIC SUPER // x21
this_class = #2 // "v1"
super_class = #12 // "java/lang/Object"
interfaces_count = 0
interfaces {
}
fields_count = 0
methods_count = 1
methods {
method {
access_flag = PUBLIC // x01
name_index = #5 // "<init>"
descriptor_index = #10 // "()V"
attributes_count = 1
attributes {
attribute Code {
attribute_name_index = #8 // "Code"
attribute_length = 17
max_stack = 1
max_locals = 1
code_length = 5
code asm {
0: aload_0
1: invokespecial #1
4: return
}
exception_table_length = 0
attributes_count = 0
}
}
}
}
attributes_count = 0
----------------------
Output on Harmony-r548657
=====================
Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software
Foundation or its licensors, as applicable.
java version "1.5.0"
pre-alpha : not complete or compatible
svn = r548657, (Jun 19 2007), Windows/ia32/msvc 1310, release build
http://harmony.apache.org
Test passed: java.lang.UnsupportedClassVersionError: class has version number
450
Output on Harmony- r549489
=====================
Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software
Foundation or its licensors, as applicable.
java version "1.5.0"
pre-alpha : not complete or compatible
svn = r549489, (Jun 21 2007), Windows/ia32/msvc 1310, release build
http://harmony.apache.org
Test failed: unexcpected error
java.lang.ClassFormatError: v1 : class has version number 450
at java.lang.ClassLoader.defineClass0(ClassLoader.java)
at java.lang.ClassLoader.defineClass(ClassLoader.java:438)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:70)
at java.net.URLClassLoader.access$3(URLClassLoader.java:1)
at
java.net.URLClassLoader$URLHandler.createClass(URLClassLoader.java:261)
at
java.net.URLClassLoader$URLFileHandler.findClass(URLClassLoader.java:560)
at java.net.URLClassLoader.findClassImpl(URLClassLoader.java:1194)
at java.net.URLClassLoader$4.run(URLClassLoader.java:889)
at java.net.URLClassLoader$4.run(URLClassLoader.java:1)
at
java.security.AccessController.doPrivilegedImpl(AccessController.java:171)
at java.security.AccessController.doPrivileged(AccessController.java:64)
at java.net.URLClassLoader.findClass(URLClassLoader.java:891)
at java.lang.ClassLoader.loadClass(ClassLoader.java:575)
at
java.lang.ClassLoader$SystemClassLoader.loadClass(ClassLoader.java:963)
at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
at java.lang.Class.forName(Class.java:146)
at java.lang.Class.forName(Class.java:103)
at test.main(test.java:6)
Thank you,
Vera Petrashkova
