To reproduce:

1. Install 1.4.2_01, then upgrade to Tiger b19
2. Remove 1.4.2_01 then 1.5.0 b19 from Control Panel -> Add/Remove Program
3. In the windows command prompt, type in java -version and the following will display:

C:\>java -version
Registry key 'Software\JavaSoft\Java Runtime Environment\CurrentVersion'
has value '1.4', but '1.5' is required.
Error: could not find java.dll
Error: could not find Java 2 Runtime Environment.

And the following registry keys will remain after uninstallation, and they should have been removed:

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft]


[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Plug-in]

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Plug-in\1.4.0]
"JavaHome"="C:\\Program Files\\Java\\j2re1.5.0"
"UseJava2IExplorer"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment]
"CurrentVersion"="1.4"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4]
"JavaHome"="C:\\Program Files\\Java\\j2re1.5.0"
"RuntimeLib"="C:\\Program Files\\Java\\j2re1.5.0\\bin\\client\\jvm.dll"
"MicroVersion"="0"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4.0]
"JavaHome"="C:\\Program Files\\Java\\j2re1.5.0"
"MicroVersion"="0"
"RuntimeLib"="C:\\Program Files\\Java\\j2re1.5.0\\bin\\client\\jvm.dll"
"EULA"=dword:00000000
"JAVAUPDATE"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start]
"CurrentVersion"="1.4.0"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start\1.0.1]
"Home"="C:\\Program Files\\Java\\j2re1.5.0\\bin"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start\1.0.1_02]
"Home"="C:\\Program Files\\Java\\j2re1.5.0\\bin"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start\1.0.1_03]
"Home"="C:\\Program Files\\Java\\j2re1.5.0\\bin"^M
^M
[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start\1.0.1_04]^M
"Home"="C:\\Program Files\\Java\\j2re1.5.0\\bin"^M
^M
[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start\1.2]^M
"Home"="C:\\Program Files\\Java\\j2re1.5.0\\bin"^M
^M
[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start\1.2.0_01]^M
"Home"="C:\\Program Files\\Java\\j2re1.5.0\\bin"^M

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start\1.4]^M
"Home"="C:\\Program Files\\Java\\j2re1.5.0\\bin"^M

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Web Start\1.4.0]^M
"Home"="C:\\Program Files\\Java\\j2re1.5.0\\bin"^M