How to find out the error in J2EE application without debugging

Hi all,
I am trying JCO example for Sales order in Netweaver Development Studio 2.0.3 and JCO 2.1.4.
I am using Java class as a object and calling the class in servlet.
I am checking one by one method ie systeminfo for getting connection and Salesorder method to get the detail.
I am using Printwrite class in Srvlet and getting the error in browser. but inside the method how I can get the error. the same way i can use the OUT.println in class also.
Thanks in advance.
Regards,
ram

You can check the log in the LogViewer service of your J2EE server

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*****& Program Type          : Report                                 *
*****& Title                 : Z_ABAP_TCODE_MONITOR                   *
*****& Transaction code      : ZTCODE_USAGE                           *
*****& Developer name        : Shailendra Kolakaluri                  *
*****& Deveopment start date : 26 th Dec 2011                         *
*****& Development Package   : ZDEV                                   *
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      variant TYPE disvariant,
      events TYPE slis_t_event WITH HEADER LINE,
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date   TYPE swncdatum,
user   TYPE swncuname,
mandt     TYPE swncmandt,
tcode     TYPE swnctcode,
report TYPE swncreportname,
count     TYPE swncshcnt,
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PERFORM get_fieldcatalog.
PERFORM set_layout.
PERFORM get_event.
PERFORM get_comment.
PERFORM display_data.
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fcat-tabname     = 't_ut'.
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