When running with a debug vm on the customers machine we hit the following assert when using 1.3.1_10.

java_g -server ... -XX:+PrintCompilation ...

.....
1850  !   com.sapportals.config.ui.renderer.ConfigTableViewModel::getColumnAt (38 bytes)
1851      com.sapportals.htmlb.rendering.RenderUtil::encodeForJS (195 bytes)
1852      sun.io.ByteToCharISO8859_1::reset (11 bytes)
1853      com. customer .services.servlets_jsp.server.HttpServletRequestFacade::putMapEntry (67 bytes)
1854  !   com.sapportals.config.ui.renderer.ConfigTableViewModel::initFromContent (287 bytes)


#
# HotSpot Virtual Machine Error, assertion failure
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# assert(is_loaded(), "must be loaded to have size")
#
# Error ID: e:\ws\1.3.1\hotspot\src\share\vm\ci\ciInstanceKlass.cpp, 121
#
# Problematic Thread: prio=5 tid=0x9dd400 nid=0xe24 runnable
#


stacktrace:
jvm_g!ciInstanceKlass::get_canonical_holder+0x4e
jvm_g!Compile::flatten_alias_type+0x32f
jvm_g!Compile::get_alias_index+0x15
jvm_g!insert_anti_dependences+0xaf
jvm_g!PhaseCFG::ScheduleLate+0x1d8
jvm_g!PhaseCFG::GlobalCodeMotion+0x19a
jvm_g!Compile::Code_Gen+0x137
jvm_g!Compile::Compile+0xa74
jvm_g!C2Compiler::compile_method+0x7f
jvm_g!CompileBroker::invoke_compiler_on_method+0x392
jvm_g!CompileBroker::compiler_thread_loop+0xb0
jvm_g!compiler_thread_entry+0x7e
....

exclude com.sapportals.config.ui.renderer.ConfigTableViewModel::initFromContent 
from being compiled.

  xxxxx@xxxxx   2004-01-26

This is NOT applicable to tiger.

stacktrace:
jvm_g!ciInstanceKlass::get_canonical_holder+0x4e
jvm_g!Compile::flatten_alias_type+0x32f
jvm_g!Compile::get_alias_index+0x15
jvm_g!insert_anti_dependences+0xaf
jvm_g!PhaseCFG::ScheduleLate+0x1d8
jvm_g!PhaseCFG::GlobalCodeMotion+0x19a
jvm_g!Compile::Code_Gen+0x137
jvm_g!Compile::Compile+0xa74
jvm_g!C2Compiler::compile_method+0x7f
jvm_g!CompileBroker::invoke_compiler_on_method+0x392
jvm_g!CompileBroker::compiler_thread_loop+0xb0
jvm_g!compiler_thread_entry+0x7e
....

frame jvm_g!ciInstanceKlass::get_canonical_holder+0x4e
this = 0x3498f84c class ciInstanceKlass *
 -> ciKlass = class ciKlass
   -> ciObject = class ciObject
     -> ResourceObj = class ResourceObj
        -> _handle = 0x00000000 class _jobject *   <<<------
           _klass =  0x00964770 class ciKlass *
_super = 0xabababab class ciInstanceKlass *
_layouy = 0xabababab class ciFieldLayout *
_java_mirror = 0xabababab class ciInstance *
_file_cache = 0x00000000 class ciConstantPoolCache *



"Somehow the compiler is manipulating a value of an unloaded class.  This
can be valid, as long as the operation only assumes that the value is a
reference to java/lang/Object.  You are backporting the present code for
evaluating a field offset."

  xxxxx@xxxxx   2004-01-26
-------------------------------------------------