EHP4 directory related doubts

Hi,
We are doing EHP4 ready system to EHP4 upgrade and have few basic questions on this. Can you experts please share your experiences ?
1) Download directory we have mentioned as /EHPI/EHPI (/EHPI filesystem was created by Unix team & after un-car of SAPehpi_42-10005805.SAR the EHPI directory got created) - is this ok ?
2) In which location should we include stack.xml ? Is there any specific location or we can place anywhere in the system & put that name in stack configuration tab under configuration phase ?
3) For the actual support pack files which we downloaded from SMP(through Solman), whether we need to uncar them and then put in /usr/sap/trans/EPS/in ? or EHPi will automatically uncar them during upgrade ?
Also is there any specific location to place the component (EA_APPL, EA_BASIS etc) specific .SAR files ?
Because of certain errors already our upgrade has to be reset couple of times in configuration stage. So like to cross check the above mentioned points based on your inputs.
Also is there any step wise guide for EHP4 available ? So we got "SAP ERP 6.0 Including Enhancement Package 4 Support Release 1" or "How to install.." etc pdf guides but there we won't screen wise step guidance unlike the normal SAP version upgrade guides that are available in the market.
We are doing EHP4 upgrade for the first time. So your help on these basic doubts will help us to proceed further.
Thanks
TS

1) Download directory we have mentioned as /EHPI/EHPI (/EHPI filesystem was created by Unix team & after un-car of SAPehpi_42-10005805.SAR the EHPI directory got created) - is this ok ?
Yes, make sure that the directory is created SIDadm. In EHP guide, it recommend to create EHPI folder under /usr/sap/
2) In which location should we include stack.xml ? Is there any specific location or we can place anywhere in the system & put that name in stack configuration tab under configuration phase ?
No. But it's a good practice you put under a EHPI/download directory. During the Configuration Phase, EHPI will ask for the stack.xml file where you can browse to the location where your xml file resided.
3) For the actual support pack files which we downloaded from SMP(through Solman), whether we need to uncar them and then put in /usr/sap/trans/EPS/in ? or EHPi will automatically uncar them during upgrade ?
No, no uncar required. EHPI will uncar them.
Also is there any specific location to place the component (EA_APPL, EA_BASIS etc) specific .SAR files ?
+No, you can place all files (upgrade files + SPs ) into the same directory.+

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 SAPKITL419 015 IMPORT_PROPER
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Hi,
We are currently struck with the same error message and SPAM is hung. The message in SLOG bieng" WARNING:
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public class Test {
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