How front end query invoke error message at backend

Dear all,
Please help me this out! I'm working on servlets(using Apache server). I'm sending sql statement to (dbaccess) database. If I do a sql statement directly at backend, the db will generate an error message. Now I'm sending the query at front end. When error occurs, the backend doesn't show the error message. I have no idea how to 1) generate the error messages at backend when a sql from front end is executed. 2) And then how the backend send the error message to the frontend.
If you have any idea, please help me. I greatly appreciate that!
Regards,
Grace

Thanks. Backend means database. But I just wonder why this exception not shown on my webpage. I made it to print out in html file.
And are you sure that the exception front end caught is the same error message that I get if I run the sql statement at backend directly? Because I'm thinking of ways to make the error message both detail and user friendly to understand.
What would you think?
Thanks again!
Grace

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Intel ICH10 AHCI:
Vendor:          Intel
Product:          ICH10 AHCI
Link Speed:          3 Gigabit
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Serial Number:                GEA534RJ06E63A
Native Command Queuing:          Yes
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Removable Media:          No
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Serial Number:               WD-WCAU43604330
Native Command Queuing:          Yes
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Removable Media:          No
Detachable Drive:          No
BSD Name:          disk0
Medium Type:          Rotational
Bay Name:          Bay 3
Partition Map Type:          GPT (GUID Partition Table)
S.M.A.R.T. status:          Verified
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BSD Name:          disk0s1
Content:          EFI
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Capacity:          999.86 GB (999,860,912,128 bytes)
Available:          715.55 GB (715,549,786,112 bytes)
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BSD Name:          disk0s2
Mount Point:          /Volumes/Data
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Native Command Queuing:          Yes
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Removable Media:          No
Detachable Drive:          No
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Rotational Rate:          7200
Medium Type:          Rotational
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BSD Name:          disk2s1
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Capacity:          999.86 GB (999,860,912,128 bytes)
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Writable:          Yes
File System:          Journaled HFS+
BSD Name:          disk2s2
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Content:          Apple_HFS

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